Actual flow shunt test device and method

Abstract

Embodiments of the present invention provide an in-line flow shunt test device and method, which relate to the technical field of fluid detection. The in-line flow shunt test device includes a flowmeter and a shunt meter. The flowmeter includes a pipe body, an orifice plate, and a sensor. The orifice plate is installed at the inlet of the pipe body, and the sensor is installed inside the pipe body. The shunt meter is of a cylindrical structure and is installed inside the pipe body. The central axis of the shunt meter is collinear with the central axis of the pipe body, and the sensor is inserted into the inside of the shunt meter. The in-line flow shunt test device replaces the test by assembling the shunt meter to the flowmeter, and at the same time, based on the shunt principle, realizes in-line testing of low-pressure large flow, and the testing is convenient, reliable, and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid detection, and in particular, to a full-flow shunt test device and method. Background Art

[0002] Thermal gas mass flowmeters are one of the current research hotspots. Most of the domestic and foreign research on thermal gas mass flow is to measure gases with small flow rates, and there is less research on full-flow testing of gases with large flow rates.

[0003] In the prior art, an experimental device for measuring the liquid flow rate in a pipeline is designed using the branch pipe flow measurement method. Flow rate measurements are carried out at multiple pumping stations to obtain the multiple relationship between the flow rates of the main pipeline and the branch pipes, and then the flow rate multiple is obtained through comparative calculations. There is also a structural model for measuring air flow designed using the branch pipe flow measurement method, with an orifice plate throttling device installed in the main pipeline to achieve different measurement ranges. There is also a small flow channel designed in the flow channel of the flowmeter, and the flow velocity in the small flow channel test section has a fixed proportional coefficient with the average flow velocity of the intake pipe, and the intake air volume is obtained by measuring the flow velocity in the small flow channel. There is also a pipeline structure of a new type of thermal distributed mass flowmeter designed. Through data analysis, a pipeline structure of a branch pipe flow measurement method flowmeter suitable for measuring liquid mass flow is obtained, providing a certain theoretical basis for the research on the thermal distributed mass flow measurement method based on the branch pipe flow measurement method. There is also a constant power type thermal gas mass flowmeter with a branch pipe and a porous rectifier designed and developed, using the temperature difference measured by the sensor to reflect the mass flow rate of the fluid in the pipeline. There is also a thermal mass flowmeter developed by combining the constant temperature difference method and the constant power method, which switches between the constant temperature difference method and the constant power method to measure the air flow rate according to the magnitude of the current in the velocity probe branch, broadening the measurement range of the flowmeter.

[0004] Most of the above research uses the branch pipe flow measurement method to obtain the performance of the entire meter by measuring the flow rate on the branch pipe. The measurement range of the flowmeter has been effectively improved, but the measurable flow rate range is still small. However, currently, due to the lack of low-pressure large-flow full-flow test equipment in the market, the maximum test flow rate of the full-flow test equipment usually can only reach 40 cubic meters per hour, so it is impossible to conduct full-flow tests on low-pressure large-flow meters. Summary of the Invention

[0005] The objectives of the present invention include providing a full-flow shunt test device and method, which assemble a shunt meter to replace the test after the flowmeter, and at the same time, based on the shunt principle, realize full-flow testing of low-pressure large flow rates, and the testing is convenient, reliable, and accurate.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides a full-flow shunt test device, and the full-flow shunt test device includes:

[0008] A flowmeter, comprising a pipe body, an orifice plate and a sensor, wherein the orifice plate is installed at the inlet of the pipe body, and the sensor is installed inside the pipe body;

[0009] A shunt meter, which is of a cylindrical structure, is installed inside the pipe body, the central axis of the shunt meter is collinear with the central axis of the pipe body, and the sensor is inserted into the shunt meter.

[0010] In an optional embodiment, the pipe body includes a first contraction section, a first measurement section and a first diffusion section that are sequentially connected. Among them, the diameter of the first contraction section shows a contracting trend, the diameter of the first measurement section remains unchanged, the diameter of the first diffusion section shows a diffusing trend, and the sensor is installed inside the first measurement section.

[0011] In an optional embodiment, the shunt meter includes a second contraction section, a second measurement section and a second diffusion section that are sequentially connected. Among them, the diameter of the second contraction section shows a contracting trend, the diameter of the second measurement section remains unchanged, the diameter of the second diffusion section shows a diffusing trend, and the sensor is installed inside the second measurement section.

[0012] In an optional embodiment, the second contraction section, the second measurement section and the second diffusion section are respectively located inside the first contraction section, the first measurement section and the first diffusion section.

[0013] In an optional embodiment, the contraction angle of the second contraction section is equal to the contraction angle of the first contraction section, and the diffusion angle of the second diffusion section is equal to the diffusion angle of the first diffusion section.

[0014] In an optional embodiment, the outer diameter of the second contraction section and the outer diameter of the second measurement section are both less than or equal to the inner diameter of the first measurement section, and the outer surface of the second diffusion section is fitted with the inner surface of the first diffusion section.

[0015] In an optional embodiment, the length of the shunt meter is less than the length of the pipe body. Inside the pipe body, a buffer rectification cavity is formed from the orifice plate to the inlet of the shunt meter.

[0016] In an optional embodiment, a notch is formed on the side wall of the shunt meter, the notch extends from the inlet of the shunt meter to the middle of the shunt meter, and the sensor slides into the shunt meter along the notch.

[0017] In an optional embodiment, the inlet of the shunt meter is in a flared shape.

[0018] In a second aspect, the present invention provides an actual flow shunt test method. The actual flow shunt test method uses the actual flow shunt test device of the foregoing embodiment. The actual flow shunt test method includes:

[0019] Calibrating and inspecting the flowmeter in an air gas flow calibration device to obtain a first flow data curve;

[0020] Install a flow divider onto a flowmeter to form an actual flow shunt test device;

[0021] Calibrate and inspect the actual flow shunt test device in an air flow calibration device for transporting air to obtain a second flow data curve;

[0022] Compare the first flow data curve and the second flow data curve to obtain a shunt ratio;

[0023] Verify the actual flow shunt test device in an actual flow standard device to obtain actual gas error data;

[0024] Derive the actual gas error data of the flowmeter based on the shunt ratio and the actual gas error data.

[0025] The beneficial effects of the actual flow shunt test device and method provided by the embodiments of the present invention include:

[0026] 1. By assembling a flow divider onto a flowmeter and replacing the test, and based on the shunt principle, actual flow testing for low-pressure large flow rates can be achieved, and the testing is convenient, reliable, and accurate;

[0027] 2. The center line of the flow divider is collinearly arranged with the center line of the pipe body, and different shunt ratios can be formed to achieve actual flow testing of different types of flowmeters. Based on this structure, for the sensor, the fluid states generated by the flowmeter and the actual flow shunt test device are the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 Structural schematic diagram of the actual flow shunt test device provided by the first embodiment of the present invention;

[0030] Figure 2 Full-sectional structural schematic diagram of the actual flow shunt test device provided by the first embodiment of the present invention;

[0031] Figure 3 Structural schematic diagram of the flow divider;

[0032] Figure 4 Full-sectional structural schematic diagram of the flow divider;

[0033] Figure 5 Flowchart of the actual flow shunt test method provided by the second embodiment of the present invention.

[0034] Icon: 100 - In - line flow splitting test device; 110 - Flow meter; 111 - Pipe body; 1111 - First contraction section; 1112 - First measurement section; 1113 - First diffusion section; 112 - Orifice plate; 113 - Sensor; 120 - Flow splitter; 121 - Second contraction section; 122 - Second measurement section; 123 - Second diffusion section; 124 - Notch. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and illustrated herein generally can be arranged and designed in a variety of different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0037] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the invention is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0039] In addition, if terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0040] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0041] First embodiment

[0042] Please refer to Figure 1 and Figure 2 , this embodiment provides an in - line flow splitting test device 100. The in - line flow splitting test device 100 includes a flow meter 110 and a flow splitter 120.

[0043] Specifically, the flowmeter 110 includes a pipe body 111, an orifice plate 112, and a sensor 113. The orifice plate 112 is installed at the inlet of the pipe body 111, and the sensor 113 is installed inside the pipe body 111.

[0044] Among them, the pipe body 111 includes a first contraction section 1111, a first measurement section 1112, and a first diffusion section 1113 that are connected in sequence. Among them, the diameter of the first contraction section 1111 shows a contracting trend, the diameter of the first measurement section 1112 remains unchanged, the diameter of the first diffusion section 1113 shows a diffusing trend, and the sensor 113 is installed inside the first measurement section 1112.

[0045] Please refer to Figures 2 to 4 , the flow divider 120 includes a second contraction section 121, a second measurement section 122, and a second diffusion section 123 that are connected in sequence. Among them, the diameter of the second contraction section 121 shows a contracting trend, the diameter of the second measurement section 122 remains unchanged, the diameter of the second diffusion section 123 shows a diffusing trend, and the sensor 113 is installed inside the second measurement section 122.

[0046] Please refer to Figure 2 , the second contraction section 121, the second measurement section 122, and the second diffusion section 123 are respectively located inside the first contraction section 1111, the first measurement section 1112, and the first diffusion section 1113. The contraction angle of the second contraction section 121 is equal to the contraction angle of the first contraction section 1111, the inner diameter of the second measurement section 122 is in a proportional relationship with the inner diameter of the first measurement section 1112, and the diffusion angle of the second diffusion section 123 is equal to the diffusion angle of the first diffusion section 1113.

[0047] The outer diameter of the second contraction section 121 and the outer diameter of the second measurement section 122 are both less than or equal to the inner diameter of the first measurement section 1112, and the outer surface of the second diffusion section 123 is fitted with the inner surface of the first diffusion section 1113. Specifically, it can be that the outer diameter of the second contraction section 121 is equal to the inner diameter of the first measurement section 1112, and the maximum outer diameter of the second contraction section 121 is less than the inner diameter of the first measurement section 1112. In this way, the flow divider 120 can be inserted into the flowmeter 110 from the outlet of the flowmeter 110 until the outer surface of the second diffusion section 123 of the flow divider 120 is fitted with the inner surface of the first diffusion section 1113, and at the same time, the flow divider 120 can be fixed in the flowmeter 110 through parts such as sealant and support rings.

[0048] Since it is not easy to disassemble the orifice plate 112 and the sensor 113 on the flowmeter 110, in this embodiment, a notch 124 is provided on the side wall of the shunt meter 120. The notch 124 extends from the inlet of the shunt meter 120 to the middle of the shunt meter 120. The sensor 113 slides into the interior of the shunt meter 120 along the notch 124. That is to say, during the process of inserting the shunt meter 120 from the outlet of the flowmeter 110 into the interior of the flowmeter 110, the sensor 113 is fixed to the first measurement section 1112 of the flowmeter 110. The sensor 113 enters the notch 124 of the shunt meter 120 and slides relative to the notch 124 until the sensor 113 is located in the second measurement section 122 of the shunt meter 120. In this way, without having to remove the orifice plate 112 and the sensor 113 on the flowmeter 110, the shunt meter 120 can be installed on the flowmeter 110, greatly improving the installation convenience and measurement reliability.

[0049] Of course, in other embodiments, it is also possible to design the shunt meter 120 to be inserted into the flowmeter 110 from the inlet of the flowmeter 110, but it is necessary to disassemble the orifice plate 112 of the flowmeter 110.

[0050] The length of the shunt meter 120 is less than the length of the pipe body 111. Inside the pipe body 111, a buffer rectification cavity is formed from the orifice plate 112 to the inlet of the shunt meter 120. The gas flowing through the buffer rectification cavity can ensure the consistency of the flow field. The inlet of the shunt meter 120 is in a flared shape, which is used to receive the gas entering the inlet of the flowmeter 110 and adjust the flow state of the gas. Then, the second contraction section 121 accelerates the gas so that the gas flows through the second measurement section 122 in a laminar state.

[0051] It is easy to understand that the inner diameter of the pipe body 111 of the flowmeter 110 can have various designed sizes, and the inner diameter of the shunt meter 120 can also be designed according to actual needs.

[0052] The beneficial effects of the actual flow shunt test device 100 provided in this embodiment include:

[0053] 1. By replacing the test after assembling the shunt meter 120 to the flowmeter 110, and based on the shunt principle, the actual flow test of low pressure and large flow is realized, and the test is convenient, reliable and accurate;

[0054] 2. The center line of the shunt meter 120 is collinear with the center line of the pipe body 111, which can form different shunt ratios to realize the actual flow test of different models of flowmeters 110. Based on this structure, for the sensor 113, the fluid states generated by the flowmeter 110 and the actual flow shunt test device 100 are the same;

[0055] 3. The flow divider 120 can be installed into the flowmeter 110 from the outlet of the flowmeter 110 without disassembling the orifice plate 112 and the sensor 113 of the flowmeter 110, which is convenient for installation and will not affect the stability and reliability of the sensor 113 test.

[0056] Second Embodiment

[0057] Please refer to Figure 5 , this embodiment provides an actual flow shunt test method. The actual flow shunt test method uses the actual flow shunt test device 100 provided by the first embodiment. The actual flow shunt test method includes the following steps:

[0058] S1: Calibrate and inspect the flowmeter 110 in the air gas flow calibration device to obtain the first flow data curve.

[0059] The flow data curve here can be obtained from the flow signals obtained during the calibration and inspection process. The flow signal is the flow indication signal given by the sensor 113, and the flow signal is proportional to the magnitude of the gas flow. The first flow data curve can reflect the metering performance of the flowmeter 110.

[0060] S2: Install the flow divider 120 onto the flowmeter 110 to form the actual flow shunt test device 100.

[0061] S3: Calibrate and inspect the actual flow shunt test device 100 in the air gas flow calibration device for conveying to obtain the second flow data curve.

[0062] The second flow data curve here can reflect the metering performance of the actual flow shunt test device 100.

[0063] S4: Compare the first flow data curve and the second flow data curve to obtain the shunt ratio.

[0064] S5: Verify the actual flow shunt test device 100 in the actual flow standard device to obtain the actual gas error data.

[0065] The actual gas error data of the actual flow shunt test device 100 here can reflect the actual flow test metering performance of the actual flow shunt test device 100.

[0066] S6: Deduce the actual gas error data of the flowmeter 110 based on the shunt ratio and the actual gas error data.

[0067] The actual gas error data of the flowmeter 110 here can reflect the actual flow test metering performance of the flowmeter 110.

[0068] The beneficial effects of the actual flow shunt test method provided by this embodiment include:

[0069] The actual flow shunt test device 100 adopted in this embodiment can achieve the actual flow test of low pressure and large flow by assembling the shunt meter 120 to the flow meter 110 and conducting the actual flow shunt test. Meanwhile, based on the shunt principle, the above-mentioned actual flow shunt test method is convenient, reliable and accurate for the test.

[0070] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A real-flow shunt test device, characterized in that, the real-flow shunt test device includes: A flowmeter (110), including a pipe body (111), an orifice plate (112) and a sensor (113), the orifice plate (112) is installed at the entrance of the pipe body (111), the sensor (113) is installed inside the pipe body (111), the pipe body (111) includes a first contraction section (1111), a first measurement section (1112) and a first diffusion section (1113) that are connected in sequence, wherein, the diameter of the first contraction section (1111) shows a contracting trend, the diameter of the first measurement section (1112) remains unchanged, the diameter of the first diffusion section (1113) shows a diffusing trend, and the sensor (113) is installed inside the first measurement section (1112); A shunt meter (120), which is of a cylindrical structure, the shunt meter (120) is installed inside the pipe body (111), the central axis of the shunt meter (120) is collinear with the central axis of the pipe body (111), the sensor (113) is inserted into the shunt meter (120), the shunt meter (120) includes a second contraction section (121), a second measurement section (122) and a second diffusion section (123) that are connected in sequence, wherein, the diameter of the second contraction section (121) shows a contracting trend, the diameter of the second measurement section (122) remains unchanged, the diameter of the second diffusion section (123) shows a diffusing trend, the sensor (113) is installed inside the second measurement section (122), the second contraction section (121), the second measurement section (122) and the second diffusion section (123) are respectively located inside the first contraction section (1111), the first measurement section (1112) and the first diffusion section (1113), the contraction angle of the second contraction section (121) is equal to the contraction angle of the first contraction section (1111), and the diffusion angle of the second diffusion section (123) is equal to the diffusion angle of the first diffusion section (1113).

2. The real-flow shunt test device according to claim 1, characterized in that, the outer diameters of the second contraction section (121) and the second measurement section (122) are both less than or equal to the inner diameter of the first measurement section (1112), and the outer surface of the second diffusion section (123) is fitted with the inner surface of the first diffusion section (1113).

3. The real-flow shunt test device according to claim 1, characterized in that, the length of the shunt meter (120) is less than the length of the pipe body (111), and a buffer rectification cavity is formed from the orifice plate (112) to the entrance of the shunt meter (120) inside the pipe body (111).

4. The real-flow shunt test device according to claim 1, characterized in that, A notch (124) is formed in the side wall of the flow divider (120), and the notch (124) extends from the inlet of the flow divider (120) to the middle of the flow divider (120). The sensor (113) slides into the interior of the flow divider (120) along the notch (124).

5. The in-line flow splitting test device according to claim 1, wherein, the inlet of the flow divider (120) is flared.

6. An in-line flow splitting test method, wherein, the in-line flow splitting test method uses the in-line flow splitting test device according to claim 1, and the in-line flow splitting test method includes: Calibrating and inspecting the flowmeter (110) in an air gas flow calibration device to obtain a first flow data curve; Installing the flow divider (120) onto the flowmeter (110) to form the in-line flow splitting test device; Calibrating and inspecting the in-line flow splitting test device in a conveying air gas flow calibration device to obtain a second flow data curve; Comparing the first flow data curve and the second flow data curve to obtain a flow splitting ratio; Verifying the in-line flow splitting test device in an in-line standard device to obtain real gas error data; Deriving the real gas error data of the flowmeter (110) based on the flow splitting ratio and the real gas error data.

Images