Gas flow device for calibrating float flowmeter

Abstract

The utility model relates to a gas flow device for calibrating a float flowmeter. The gas flow device comprises a gas generator; a pressure control assembly; the flow regulating valve is used for regulating the flow of the gas medium; the etalon assembly at least comprises a first etalon, a first valve body connected with the first etalon and the measured float flowmeter, a second etalon and a second valve body connected with the second etalon and the measured float flowmeter, and the measuring range of the first etalon is different from that of the second etalon; the measured float flowmeter is selectively communicated with the first valve body or the second valve body; the controller, the pressure control assembly, the flow regulating valve and the standard device assembly are all connected with the controller, when the standard device with at least two measuring ranges is arranged in different flow ranges, the standard device with the measuring ranges does not need to be independently connected again, only the controller needs to control opening and closing of a valve body of the corresponding standard device, shutdown installation is not needed, operation is easy, and the cost is low. The structure is simple, operation is convenient, automation is high, and meanwhile work efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of flow meter calibration, and in particular relates to a gas flow device for calibrating a float flow meter. Background Art

[0002] The float flowmeter (also known as rotor flowmeter) is a traditional variable area flow measurement device. When the flow changes, the float moves up and down in the vertical conical tube, and the annular flow area formed between the conical tube and the float changes. Based on this principle, the volume flow meter for flow measurement is realized. It has the advantages of simple mechanical structure, convenient processing, stable operation, high reliability and small pressure loss. It can especially measure low Reynolds number and small flow medium. Therefore, it is widely used in industrial fields such as petroleum, coal, metallurgy, light chemical industry, food hygiene, etc.

[0003] The float flowmeter must be installed on a vertical pipe, and the fluid medium passes from bottom to top. When the fluid passes through the tapered tube from bottom to top, a pressure difference is generated between the upper and lower ends of the float, and the float rises under the action of this differential pressure. When the differential pressure, buoyancy, viscous lift and gravity of the float are zero, the float is in a balanced position. Therefore, there is a certain proportional relationship between the flow rate of the fluid flowing through the float flowmeter and the height of the float rise, that is, the flow area of ​​the flowmeter. The scale where the float position height is located can be used as the flowmeter indication.

[0004] The accuracy of the float flowmeter directly affects the control quality and production efficiency of the industrial process. Different flow points (i.e. different flow ranges) will cause the position of the float in the tapered tube to change, and the flow value corresponding to each position needs to be accurately calibrated. If calibration is not performed, the measured value may have a large error, which will affect the stability of the entire process and product quality.

[0005] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Utility Model Content

[0006] In view of this, the embodiment of the present application provides a gas flow device for calibrating a float flowmeter to solve at least one problem existing in the background technology, including:

[0007] A gas generator for generating a gas medium;

[0008] A pressure control assembly connected to the gas generator;

[0009] A flow regulating valve, one end of which is connected to the pressure control assembly and the other end of which is connected to the measured float flowmeter, the flow regulating valve being used to regulate the flow of the gas medium;

[0010] A standard component, comprising at least a first standard, a first valve body connecting the first standard and the measured float flowmeter, and a second standard and a second valve body connecting the second standard and the measured float flowmeter, wherein the measuring range of the first standard is different from the measuring range of the second standard, and the measured float flowmeter can be selectively connected to the first valve body or the second valve body;

[0011] The controller is connected to the pressure control component, the flow regulating valve and the standard component.

[0012] Optionally, the above-mentioned gas flow device for calibrating a float flowmeter further includes a first detection component and a second detection component, wherein the first detection component is arranged between the flow regulating valve and the float flowmeter to be measured, and the second detection component is arranged between the float flowmeter to be measured and the standard component.

[0013] Optionally, in the above-mentioned gas flow device for calibrating a float flowmeter, the first detection component includes a first temperature detection component connected to the flow regulating valve and a first pressure detection component connected to the first temperature detection component and the float flowmeter to be measured.

[0014] Optionally, in the above-mentioned gas flow device for calibrating a float flowmeter, the second detection assembly includes a second temperature detection component connected to the measured float flowmeter and a second pressure detection component connecting the second temperature detection component and the standard device assembly.

[0015] Optionally, in the above-mentioned gas flow device for calibrating a float flowmeter, the pressure control component includes a pressure reducing valve connected to the gas generator.

[0016] Optionally, in the above-mentioned gas flow device for calibrating a float flowmeter, the pressure control component also includes a pressure-stabilizing valve connected to the pressure reducing valve, and the pressure-stabilizing valve can keep the gas medium at 0.2MPa and make the pressure fluctuation of the gas medium less than 100Pa.

[0017] Compared with the prior art, the present application has the following beneficial effects: by connecting the measured float flowmeter in parallel with at least two standards of different ranges, it is possible to select the standard of the corresponding flow range for connection under different flow ranges, thereby realizing calibration of the flow range. Setting at least two standards of different ranges does not require reconnecting the standard of the range separately when changing to a different flow range. It is only necessary to control the switch of the valve body of the corresponding standard through the controller, and there is no need to stop the machine for installation. It has a simple structure, convenient operation, high automation and can improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic diagram of a gas flow device for calibrating a float flowmeter shown in the present application. DETAILED DESCRIPTION

[0019] The exemplary embodiments disclosed in the present application will be described in more detail below. In the following description, a large number of specific details are given in order to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described; that is, all features of the actual embodiments are not described here, and known functions and structures are not described in detail.

[0020] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part. And when the second element, component, region, layer or part is discussed, it does not indicate that the present application necessarily has the first element, component, region, layer or part.

[0021] Spatially relative terms such as "under", "beneath", "below", "under", "over", "above", etc., may be used herein for convenience of description to describe the relationship of one element or feature to other elements or features shown in the figures. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation shown in the figures.

[0022] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "a", "an" and " / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0023] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0024] Please refer to Figure 1 As shown, the embodiment of the present application provides a gas flow device for calibrating a float flowmeter, including a gas generator 1 for generating a gas medium, a pressure control component connected to the gas generator 1, and a flow control valve 4 and a standard 10 component and a controller 11. Among them, the pressure control component, the flow control valve 4 and the standard 10 component are all connected to the controller 11 to execute the signal sent by the controller 11 or transmit the signal to the controller 11, etc. The connection between the above components and the controller 11 can be an electrical connection or a signal connection, which is not limited here; the signal transmission is a mature technology in the field and is not described in detail here.

[0025] In an optional embodiment, the pressure control assembly includes a pressure reducing valve 2 connected to the gas generator 1 and a pressure stabilizing valve 3 connected to the pressure reducing valve 2, so as to reduce the pressure of the gas generated in the gas generator 1, prevent excessive pressure from causing damage to subsequent structures, and stabilize the pressure of the gas within a certain range, so that the downstream structure of the entire device will not be affected by changes or fluctuations in the pressure in the upstream structure, and the stable pressure can also ensure the accuracy and consistency of the measurement results. In this embodiment, the pressure stabilizing valve 3 can keep the gas medium at 0.2MPa and make the pressure fluctuation of the gas medium less than 100Pa.

[0026] In an optional embodiment, one end of the flow regulating valve 4 is connected to the pressure control component, and the other end is connected to the float flowmeter 7 to be measured. The flow regulating valve 4 is used to adjust the flow of the gas medium, so as to adjust different flow points of the gas through the flow regulating valve 4 to achieve detection of different flow points.

[0027] In an optional embodiment, the gas flow device for calibrating the float flowmeter also includes a first detection component and a second detection component. The first detection component is arranged between the flow regulating valve 4 and the float flowmeter 7 to be measured, and is used to detect the temperature and pressure of the gas before entering the float flowmeter 7 to be measured; the second detection component is arranged between the float flowmeter 7 to be measured and the standard device 10 component, and is used to detect the temperature and pressure of the gas after passing through the float flowmeter 7 to be measured.

[0028] Specifically, the first detection assembly includes a first temperature detection member 5 connected to the flow control valve 4 and a first pressure detection member 6 connected to the first temperature detection member 5 and the measured float flowmeter 7. The first temperature detection member 5 is used to detect the temperature of the gas before entering the measured float flowmeter 7, and the first pressure detection member 6 is used to detect the pressure of the gas before entering the measured float flowmeter 7.

[0029] The second detection assembly includes a second temperature detection member 8 connected to the measured float flowmeter 7 and a second pressure detection member 9 connecting the second temperature detection member 8 and the standard device 10 assembly. The second temperature detection member 8 is used to detect the temperature of the gas after entering the measured float flowmeter 7, and the second pressure detection member 9 is used to detect the pressure of the gas after entering the measured float flowmeter 7.

[0030] The first detection component and the second detection component are set. On the one hand, the measured results of the first detection component and the second detection component can be used to determine whether the measured float flowmeter 7 is faulty. On the other hand, the difference between the two detection results can be used to make corrections during calibration of the standard device 10 to obtain a more accurate calibration result. For example, if the difference between the results of the first detection component and the second detection component is greater than the preset difference range, it is determined that the measured float flowmeter 7 is faulty; if the difference between the results of the first detection component and the second detection component is less than the preset difference range, the formula can be used when the standard device 10 is subsequently calibrated. make corrections;

[0031] Where: q s The actual flow value of the corrected standard device 10 under the standard state;

[0032] q r —Displayed flow value of the standard device 10;

[0033] P1—pressure value measured by the first pressure detection element 6;

[0034] P2—pressure value measured by the second pressure detection member 9;

[0035] T1—temperature value measured by the first temperature detection element 5;

[0036] T2—the temperature value measured by the second temperature detection component 8.

[0037] In this embodiment, taking the actual flow rate of the measured float flowmeter 7 as 5.1L / min as an example, the difference between the second detection component and the first detection component is less than the preset difference range, indicating that the measured float flowmeter is working normally and there is no fault. At this time, the reading of the measured float flowmeter 7 is displayed as 5L / min, and the reading of the corresponding range standard 10 is displayed as 5.2L / min. The standard value is corrected by the above formula, and the corrected value is 5.1L / min, indicating that the actual flow rate of the measured float flowmeter 7 is 5.1L / min, that is, when the measured float flow reading shows 5L / min, the corresponding actual flow rate is 5.1L / min.

[0038] In an optional embodiment, the standard device 10 assembly includes at least a first standard device 104, a first valve body 101 connecting the first standard device 104 and the float flowmeter 7 to be measured, and a second standard device 105 and a second valve body 102 connecting the second standard device 105 and the float flowmeter 7 to be measured. The measuring range of the first standard device 104 is different from the measuring range of the second standard device 105, and the float flowmeter 7 to be measured can be selectively connected to the first valve body 101 or the second valve body 102 to calibrate the float flowmeter 7 to be measured at different flow points.

[0039] In this embodiment, the standard device 10 assembly includes a first standard device 104, a second standard device 105 and a third standard device 106 connected in parallel between the measured float flowmeter 7 and the controller 11, and a first valve body 101 connected to the first standard device 104, a second valve body 102 connected to the second standard device 105, and a third valve body 103 connected to the third standard device 106. Among them, the ranges of the first standard device 104, the second standard device 105 and the third standard device 106 are all different, but the measurement accuracy is 1.0 level. For example, the first standard device 104 is a high-range gas mass flowmeter with a range of 5-500L / min, the second standard device 105 is a medium-range gas mass flowmeter with a range of 0.5-50L / min, and the third standard device 106 is a low-range gas mass flowmeter with a range of 50-5000mL / min. In other embodiments, the specific ranges of the above three flowmeters are not specifically limited and are determined according to actual conditions.

[0040] In summary, the working process of this application is:

[0041] (1) According to the flow range of the measured float flowmeter 7, select the standard instrument 10 of the corresponding range (the first standard instrument 104 or the second standard instrument 105 or the third standard instrument 106), open the valve body of the selected branch of the standard instrument 10 (the first valve body 101 or the second valve body 102 or the third valve body 103), and close the valve bodies of the other two branches.

[0042] (2) Turn on the gas generator 1, adjust the gas to 0.2 MPa with the pressure regulating valve 3, adjust the flow regulating valve 4 so that the float of the measured float flowmeter 7 stops at a certain scale line position, and record the flow reading of the corresponding standard device 10.

[0043] (3) According to the gas temperature and pressure value at the air inlet of the measured float flowmeter 7 and the gas temperature and pressure value at the air outlet of the measured float flowmeter 7, the flow reading of the corresponding range standard is corrected to obtain the actual flow rate. The actual flow rate is the flow value of the measured float flowmeter 7 at this scale.

[0044] (4) Repeat the above steps to calibrate the flow values ​​of other scale lines of the float flowmeter.

[0045] In this process, the flow range of the measured float flowmeter 7 can be different flow points of the same float flowmeter. At this time, different flow points can be calibrated by selecting standards 10 of different ranges for different flow points; the change of the flow range of the measured float flowmeter 7 can also be float flowmeters of different specifications. At this time, different specifications of flowmeters can be calibrated by selecting standards 10 of different ranges for flowmeters of different specifications.

[0046] The above is only a specific implementation of the present application, and any other improvements made based on the concept of the present application are deemed to be within the protection scope of the present application.

Claims

1. A gas flow device for calibrating a float flowmeter, characterized in that: include: A gas generator for generating a gas medium; A pressure control assembly connected to the gas generator; A flow regulating valve, one end of which is connected to the pressure control assembly and the other end of which is connected to the measured float flowmeter, the flow regulating valve being used to regulate the flow of the gas medium; A standard component, comprising at least a first standard, a first valve body connecting the first standard and the measured float flowmeter, and a second standard and a second valve body connecting the second standard and the measured float flowmeter, wherein the measuring range of the first standard is different from the measuring range of the second standard, and the measured float flowmeter can be selectively connected to the first valve body or the second valve body; The controller is connected to the pressure control component, the flow regulating valve and the standard component.

2. A gas flow device for calibrating a float flowmeter according to claim 1, characterized in that: The device further comprises a first detection component and a second detection component, wherein the first detection component is arranged between the flow regulating valve and the measured float flowmeter, and the second detection component is arranged between the measured float flowmeter and the standard device component.

3. A gas flow device for calibrating a float flowmeter according to claim 2, characterized in that: The first detection assembly includes a first temperature detection component connected to the flow regulating valve and a first pressure detection component connected to the first temperature detection component and the measured float flowmeter.

4. A gas flow device for calibrating a float flowmeter according to claim 2, characterized in that: The second detection assembly includes a second temperature detection component connected to the measured float flowmeter and a second pressure detection component connecting the second temperature detection component and the standard device assembly.

5. A gas flow device for calibrating a float flowmeter according to claim 1, characterized in that: The pressure control assembly includes a pressure reducing valve connected to the gas generator.

6. A gas flow device for calibrating a float flowmeter according to claim 5, characterized in that: The pressure control assembly further comprises a pressure stabilizing valve connected to the pressure reducing valve, wherein the pressure stabilizing valve can keep the gas medium at 0.2 MPa and make the pressure fluctuation of the gas medium less than 100 Pa.

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