Multifunctional detection device for mobile natural gas ultrasonic flowmeter

Abstract

The utility model provides a movable type natural gas ultrasonic flowmeter multifunctional detection device which comprises a base body 1, wheels 7 and a support 8 are arranged at the bottom of the base body 1, and the wheels 7 and the support 8 are used for moving the movable type natural gas ultrasonic flowmeter multifunctional detection device and fixing the movable type natural gas ultrasonic flowmeter multifunctional detection device in the working process. A placing table 2, a frequency conversion fan 3 and a control cabinet 5 are arranged on the base body 1, and a hoisting table 6 is further arranged at the top of the base body 1; wherein the placing table 2 is configured to be capable of horizontally and vertically moving; the quick connecting device 9 is arranged on the placing table 2 and used for being connected with the natural gas ultrasonic flowmeter; an outlet of the variable-frequency fan 3 is connected with the quick connecting device 9 through the variable-diameter hose 4; the nitrogen cylinder group 10 is arranged on the variable-frequency fan 3, and an outlet of the nitrogen cylinder group 10 is connected with the quick connecting device 9 through the variable-diameter hose 4; and the control cabinet 5 is used for detecting the natural gas ultrasonic flowmeter. According to the utility model, the natural gas ultrasonic flowmeter can be conveniently mounted and dismounted, the use convenience is improved, and the mobility is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas metering, in particular to a mobile natural gas ultrasonic flow meter multifunctional detection device. Background Art

[0002] For a long time, my country's natural gas has been traded through the measurement of ultrasonic flow meters, and the accuracy of ultrasonic flow meters is completed through offline regular calibration.

[0003] Offline regular calibration means that at regular intervals, users need to dismantle the ultrasonic flowmeter from the site of use and transport it to a metrology technical organization for calibration before it can be used again. Ultrasonic flowmeters that fail the calibration need to be diagnosed for faults and recalibrated after repair before they can be used.

[0004] Existing faulty ultrasonic flowmeters are mainly discovered during calibration, but there are the following problems: first, the economic cost to users is high (materials, labor, replacement, etc. during installation), second, the calibration efficiency is low (disassembly and assembly take time), and third, the cause of the fault is difficult to determine (the standard flow rate is given on the test bench, and it can only determine whether there is a pulse or whether it is out of tolerance, but it cannot determine why).

[0005] Ultrasonic flow meters are increasingly used in the natural gas industry due to their advantages such as low pressure loss and large range ratio. However, due to their high degree of intelligence, fault diagnosis is also more complicated.

[0006] The existing technology has the following deficiencies: First, there are few diagnostic functions. It mainly focuses on the indication error exceeding the tolerance, and it is impossible to determine whether the repeatability and sound velocity meet the requirements; second, the diagnosis is not accurate enough. It mainly judges whether the error exceeds the tolerance by the pulse counting state within a period of time, and it is impossible to further determine the faulty transducer and the specific cause of the faulty transducer. Third, it is not convenient enough. Ultrasonic flow meters are generally heavy, and the installation and disassembly methods are not refined and the convenience design is not enough. Fourth, the mobility is not enough, there are many fixed fault detection devices, and the detection devices are not portable enough, which restricts the use location; fifth, the safety is not enough, explosion-proof design is rarely carried out, and the use scenarios are limited. Utility Model Content

[0007] The utility model aims to provide a mobile natural gas ultrasonic flow meter multifunctional detection device which overcomes the above problems or at least partially solves the above problems.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the utility model is specifically implemented as follows:

[0009] The utility model provides a mobile natural gas ultrasonic flow meter multifunctional detection device, comprising:

[0010] A base body 1, the bottom of which is provided with wheels 7 and a bracket 8, the wheels 7 and the bracket 8 are used for moving the mobile natural gas ultrasonic flow meter multifunctional detection device and fixing it during operation;

[0011] A display table 2, a variable frequency fan 3, and a control cabinet 5 are arranged on the base 1, and a hoisting table 6 is also arranged on the top of the base 1; wherein:

[0012] The display table 2 is configured to be movable horizontally and vertically;

[0013] The quick connection device 9 is arranged on the display table 2 and is used to connect the natural gas ultrasonic flow meter;

[0014] The outlet of the variable frequency fan 3 is connected to the quick connection device 9 through a reducing hose 4;

[0015] The nitrogen cylinder group 10 is arranged on the variable frequency blower 3, and the outlet of the nitrogen cylinder group 10 is connected to the quick connection device 9 through the reducing hose 4;

[0016] The control cabinet 5 is used to detect the natural gas ultrasonic flow meter.

[0017] Optionally, the base body 1 is an explosion-proof box.

[0018] Optionally, the hoisting platform 6 and the display platform 2 are arranged in a corresponding position.

[0019] Optionally, the display table 2 includes three arranged in parallel; the quick connection devices 9 include two; the display tables on both sides are respectively used to set a quick connection device, and the display table in the middle is used to set a natural gas ultrasonic flow meter.

[0020] Optionally, the reducer hose 4 includes two hoses; one of which is used to connect to the outlet of the variable frequency blower 3 , and the other is used to connect to the outlet of the nitrogen cylinder group 10 .

[0021] Optionally, the control cabinet 5 includes: a power supply unit, a verification system, a pulse acquisition unit, a control unit, and a display unit; wherein:

[0022] A power supply unit, used to supply power to the verification system, the pulse acquisition unit, the control unit and the display unit;

[0023] A control unit, connected to the variable frequency fan 3, for controlling the variable frequency fan 3;

[0024] The display unit is used to provide the pulse number display function for the pulse acquisition unit and control the verification system, the control unit and the pulse acquisition unit.

[0025] Optionally, the power supply unit is a 24V power supply.

[0026] It can be seen that the multifunctional detection device of the mobile natural gas ultrasonic flow meter provided by the utility model can be easily installed and disassembled, thereby improving the convenience of use; at the same time, the mobility of the detection device is guaranteed, the use position is not restricted, and the utilization rate is improved.

[0027] In addition, explosion-proof design is adopted to make the application scenarios more extensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of a mobile natural gas ultrasonic flow meter multifunctional detection device provided in an embodiment of the utility model;

[0030] Figure 2 A schematic structural diagram of a control cabinet of a mobile natural gas ultrasonic flowmeter multifunctional detection device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0031] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0032] Figure 1 The structure diagram of the mobile natural gas ultrasonic flow meter multifunctional detection device provided by the embodiment of the utility model is shown in FIG. Figure 1 The embodiment of the utility model provides a mobile natural gas ultrasonic flow meter multifunctional detection device, comprising:

[0033] A base body 1, the bottom of which is provided with wheels 7 and a bracket 8, the wheels 7 and the bracket 8 are used for moving the mobile natural gas ultrasonic flow meter multifunctional detection device and fixing it during operation;

[0034] A display table 2, a variable frequency fan 3, and a control cabinet 5 are arranged on the base 1, and a hoisting table 6 is also arranged on the top of the base 1; wherein:

[0035] The display table 2 is configured to be movable horizontally and vertically;

[0036] The quick connection device 9 is arranged on the display table 2 and is used to connect the natural gas ultrasonic flow meter;

[0037] The outlet of the variable frequency fan 3 is connected to the quick connection device 9 through a reducing hose 4;

[0038] The nitrogen cylinder group 10 is arranged on the variable frequency blower 3, and the outlet of the nitrogen cylinder group 10 is connected to the quick connection device 9 through the reducing hose 4;

[0039] The control cabinet 5 is used to detect the natural gas ultrasonic flow meter.

[0040] Specifically, wheels 7 and brackets 8 are provided at the bottom of the base 1, so as to realize the movement and fixation of the mobile natural gas ultrasonic flow meter multifunctional detection device provided in the embodiment of the utility model.

[0041] As an optional implementation of the embodiment of the utility model, the base 1 is an explosion-proof box. The base 1 is designed to be explosion-proof, so that the application scenarios are more extensive.

[0042] As an optional implementation of the embodiment of the utility model, the hoisting platform 6 is arranged corresponding to the position of the display platform 2. Thus, the natural gas ultrasonic flow meter can be hoisted and placed on the display platform 2 for easy installation.

[0043] As an optional implementation of the embodiment of the utility model, the display table 2 includes three arranged in parallel; the quick connection device 9 includes two; the display tables on both sides are used to set a quick connection device respectively, and the display table in the middle is used to set the natural gas ultrasonic flow meter. The quick connection devices are arranged on both sides of the natural gas ultrasonic flow meter, which can facilitate the connection and further improve the installation efficiency.

[0044] As an optional implementation of the present utility model, the variable diameter hose 4 includes two hoses, one of which is used to connect to the outlet of the variable frequency blower 3, and the other is used to connect to the outlet of the nitrogen cylinder group 10. This facilitates the natural gas ultrasonic flow meter to perform flow detection.

[0045] See also Figure 2 As an optional implementation of the embodiment of the utility model, the control cabinet 5 includes: a power supply unit, a verification system, a pulse acquisition unit, a control unit, and a display unit; wherein:

[0046] A power supply unit, used to supply power to the verification system, the pulse acquisition unit, the control unit and the display unit;

[0047] A control unit, connected to the variable frequency fan 3, for controlling the variable frequency fan 3;

[0048] The display unit is used to provide the pulse number display function for the pulse acquisition unit and control the verification system, the control unit and the pulse acquisition unit.

[0049] The natural gas ultrasonic flow meter can be conveniently tested through the control cabinet 5.

[0050] As an optional implementation of the embodiment of the utility model, the power supply unit is a 24V power supply.

[0051] As an optional implementation of the present utility model, the natural gas ultrasonic flow meter can be tested as follows through the control cabinet:

[0052] 1. Metrological performance testing, including:

[0053] (1) Indication error detection

[0054] It is normal if pulses are collected within a certain period of time (the time is adjustable, generally 30s). If pulses cannot be collected, it indicates a serious fault.

[0055] The instrument coefficient detection value calculated based on the number of pulses within a given time deviates from the first allowable threshold of the factory instrument coefficient, which is the indication error fault table. (For example, for a 1.0-level meter, the threshold above the boundary flow point is 1%, and the threshold below the boundary flow point is doubled to 2%).

[0056] (2) Repeatability test

[0057] The repeatability deviation from the second allowable threshold calculated based on the number of pulses within a given time is the repeatability over-tolerance fault table. (For example, for a 1.0 level table, the threshold above the boundary flow point is one-fifth of it, i.e. 0.2%, and the threshold below the boundary flow point is doubled to 0.4%).

[0058] If any of the indication error and repeatability exceeds the tolerance, the meter will be faulty.

[0059] 2. Transducer detection

[0060] After determining the out-of-tolerance fault table, use the blind plate structure in the quick-connect regulator to block both sides of the ultrasonic flowmeter and inject a certain pressure of nitrogen. Within a given time, all transducers are synchronously collected to measure the sound velocity, gas temperature, and gas pressure. According to the gas temperature and gas pressure, the theoretical sound velocity is calculated according to the sound velocity method in the AGA 8 report.

[0061] For excessive indication error, determine in turn whether the difference between the transducer measured sound velocity and the theoretical sound velocity exceeds the third allowable threshold (generally ±0.2%) to determine the faulty transducer causing the excessive indication error.

[0062] For repeatability deviation, one is to determine whether the maximum difference between the sound speeds measured by each transducer exceeds the fourth allowable threshold (generally 0.5m / s); the other is to determine whether the consistency between them exceeds the fifth allowable threshold (generally 0.05%) based on the Bessel formula.

[0063] 3. Fault Diagnosis and Analysis

[0064] Based on the above detection data, data analysis is performed through the data model to provide the fault causes and maintenance suggestions of the fault table.

[0065] It can be seen that the multifunctional detection device of the mobile natural gas ultrasonic flow meter provided by the utility model can be easily installed and disassembled, thereby improving the convenience of use; at the same time, the mobility of the detection device is guaranteed, the use position is not restricted, and the utilization rate is improved.

[0066] In addition, explosion-proof design is adopted to make the application scenarios more extensive.

[0067] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A mobile natural gas ultrasonic flow meter multifunctional detection device, characterized in that: include: A base (1), the bottom of the base (1) is provided with wheels (7) and a bracket (8), the wheels (7) and the bracket (8) are used for moving the mobile natural gas ultrasonic flow meter multifunctional detection device and fixing it during operation; A display table (2), a variable frequency fan (3), and a control cabinet (5) are arranged on the base (1), and a hanging table (6) is also arranged on the top of the base (1); wherein: The display table (2) is configured to be movable horizontally and vertically; A quick connection device (9) is arranged on the display table (2) and is used for connecting a natural gas ultrasonic flow meter; The outlet of the variable frequency fan (3) is connected to the quick connection device (9) via a reducing hose (4); The nitrogen bottle group (10) is arranged on the variable frequency fan (3), and the outlet of the nitrogen bottle group (10) is connected to the quick connection device (9) through the reducer hose (4); The control cabinet (5) is used to detect the natural gas ultrasonic flow meter.

2. The multifunctional detection device of the mobile natural gas ultrasonic flowmeter according to claim 1 is characterized in that: The base (1) is an explosion-proof box.

3. The multifunctional detection device of the mobile natural gas ultrasonic flowmeter according to claim 1 is characterized in that: The hoisting platform (6) is arranged in a corresponding position to the placement platform (2).

4. The multifunctional detection device of the mobile natural gas ultrasonic flowmeter according to claim 1 is characterized in that: The display table (2) comprises three arranged in parallel; The quick connection device (9) comprises two; The display tables on both sides are used to set up a quick connection device respectively, and the display table in the middle is used to set up a natural gas ultrasonic flow meter.

5. The multifunctional detection device of the mobile natural gas ultrasonic flowmeter according to claim 1 is characterized in that: The variable diameter hose (4) includes two hoses; one hose is used to connect to the outlet of the variable frequency blower (3), and the other hose is used to connect to the outlet of the nitrogen bottle group (10).

6. The multifunctional detection device of the mobile natural gas ultrasonic flowmeter according to claim 1 is characterized in that: The control cabinet (5) comprises: a power supply unit, a verification system, a pulse collection unit, a control unit, and a display unit; wherein: The power supply unit is used to supply power to the verification system, the pulse acquisition unit, the control unit and the display unit; The control unit is connected to the variable frequency fan (3) and is used to control the variable frequency fan (3); The display unit is used to provide a pulse number display function for the pulse acquisition unit, and to control the verification system, the control unit and the pulse acquisition unit.

7. The multifunctional detection device of the mobile natural gas ultrasonic flowmeter according to claim 6 is characterized in that: The power supply unit is a 24V power supply.

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