Turbine flowmeter with self-diagnosis function

Abstract

The turbine flowmeter with the self-diagnosis function comprises a shell communicated with a pipeline through a flange, a rectifier used for changing the gas flow state from turbulent flow to advection and a support used for supporting the rectifier are sequentially arranged in an inner cavity of the shell in the gas inlet direction, the side, away from the gas inlet end, of the rectifier is fixedly connected with the support, and the side, away from the gas inlet end, of the rectifier is fixedly connected with the support. A shaft rod is movably connected to the center of an inner cavity of the support, an impeller is fixedly connected to the end, close to the rectifier, of the shaft rod, and a metering assembly is arranged in an inner cavity of the shell. The moving speed of fluid in the cavity of the shell is measured and calculated through a time difference method of propagation of ultrasonic waves in downstream and countercurrent, then the moving speed is compared with the metering output state of the metering assembly, and whether the turbine flowmeter operates normally or breaks down or not is judged. When a fault is detected, the turbine flow meter controls the motor valve to cut off a pipe network in time through the Internet of Things technology and uploads fault information to a management platform, so that a management center can repair or replace the turbine flow meter in time, and large economic losses are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of turbine flowmeters, in particular to a turbine flowmeter with a self-diagnosis function. Background Art

[0002] The turbine flowmeter is a velocity flow meter with temperature and pressure compensation functions. It is a type of velocity flowmeter. Its working principle is: the power of the flowing fluid drives the turbine blades to rotate, and its rotation speed is approximately proportional to the volume flow rate. The fluid volume indication passing through the flowmeter is based on the number of revolutions of the turbine impeller.

[0003] At present, the gas turbine flowmeters produced, sold and used in the market, whether pure mechanical display, pure electronic display or mechanical and electronic dual display, lack the function of judging whether the flowmeter itself is in normal working state or in fault state, except for the basic metering function and Internet of Things function. With the expansion of urban pipeline network, the increase of user groups, the increase of labor costs, and the increasing daily inspection and maintenance work, the online turbine gas flowmeter fails during operation and cannot be alarmed and handled in time, which will bring huge economic losses to urban gas managers and easily cause unnecessary disputes between managers and users. For this reason, we propose a turbine flowmeter with self-diagnosis function. Utility Model Content

[0004] The utility model aims to provide a turbine flowmeter with a self-diagnosis function, which is used to solve the problems raised by the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0006] A turbine flowmeter with a self-diagnosis function, comprising:

[0007] A shell connected to a pipeline through a flange, wherein an inner cavity thereof is provided with a rectifier for changing the gas flow state from turbulent flow to flat flow and a support for supporting the rectifier in sequence along the air inlet direction, wherein the side of the rectifier away from the air inlet end is fixedly connected to the support, an axle is movably connected to the center of the inner cavity of the support, and an impeller is fixedly connected to one end of the axle close to the rectifier, a metering component is provided in the inner cavity of the shell, and a first ultrasonic transducer and a second ultrasonic transducer are embedded in the bottom of the shell and tilted in sequence along the air inlet direction.

[0008] As a preferred technical solution, the metering assembly includes a magnetic signal generating disk installed on the end of the shaft away from the impeller, a pulse sensor used in conjunction with the magnetic signal generating disk is installed on the top of the shell, and a through hole for the pulse sensor to pass through is opened on the support.

[0009] As a preferred technical solution, the metering component also includes a pressure sensor for measuring gas pressure and a temperature sensor for measuring gas temperature, which are sequentially embedded in the top of the shell along the air inlet direction. The pulse sensor is located between the pressure sensor and the temperature sensor, and the pressure sensor and temperature sensor are respectively located on both sides of the support.

[0010] As a preferred technical solution, the upper and lower parts of the outer surface of the shell are provided with protective shells, and a volume corrector electrically connected to the pressure sensor, the temperature sensor, the pulse sensor, the magnetic signal generating disk, the first ultrasonic transducer and the second ultrasonic transducer is installed on the protective shell located at the top. The volume corrector is used to adjust the working states or parameters of the pressure sensor, the temperature sensor, the pulse sensor, the magnetic signal generating disk, the first ultrasonic transducer and the second ultrasonic transducer, and to receive the pressure signal emitted by the pressure sensor, the temperature signal emitted by the temperature sensor, the pulse signal emitted by the pulse sensor, the magnetic signal emitted by the magnetic signal generating disk, and the ultrasonic signal emitted by the first ultrasonic transducer and the second ultrasonic transducer.

[0011] As a preferred technical solution, the first ultrasonic transducer and the second ultrasonic transducer are both arranged in a protective shell located below, and the first ultrasonic transducer and the second ultrasonic transducer are symmetrically arranged with respect to the protective shell located below, the pressure sensor, the pulse sensor and the temperature sensor are all arranged in a protective shell located above, and the shell is provided with mounting holes adapted to the pressure sensor, the pulse sensor, the temperature sensor, the first ultrasonic transducer and the second ultrasonic transducer, and both ends of the mounting holes are respectively connected to the inner cavities of the shell and the protective shell.

[0012] As a preferred technical solution, the protective shell is detachably mounted on the surface of the shell by screws.

[0013] As a preferred technical solution, a front bearing and a rear bearing are respectively installed at both ends of the surface of the shaft rod, and the two ends of the shaft rod are rotatably connected to the inner cavity of the support through the front bearing and the rear bearing.

[0014] As a preferred technical solution, the housing, rectifier and impeller are all located on the same axis.

[0015] The utility model has at least the following beneficial effects:

[0016] The beneficial effect of the utility model of the present application is that it measures the movement speed of the fluid in the shell cavity by measuring the principle that the time for sound waves to propagate in the flowing medium is related to the flow rate of the medium, that is, by using the time difference method for ultrasonic waves to propagate in the downstream and upstream; the first upstream ultrasonic transducer sends an ultrasonic signal to the second downstream ultrasonic transducer and obtains the measurement time t1, and then the second downstream ultrasonic transducer sends an ultrasonic signal to the first upstream ultrasonic transducer in the opposite direction, and obtains the measurement time t2, and through these two measurement time differences △t=t2-t1=0 or △t>0, calculates whether the gas moves in the measured flow channel of the turbine flowmeter and the movement speed, and then compares it with the metering output state of the metering component to determine whether the turbine flowmeter is operating normally or faulty; when a fault is detected, the turbine flowmeter controls the motor valve through the Internet of Things technology to cut off the pipeline in time and upload the fault information to the management platform, so as to facilitate the management center to repair or replace it in time to avoid causing large economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main cross-section of the structure of a turbine flowmeter with a self-diagnosis function according to the utility model;

[0018] Figure 2 It is a schematic diagram of a partial connection structure of a turbine flowmeter with a self-diagnosis function according to the utility model;

[0019] Figure 3 The utility model is a schematic diagram of the structure of a turbine flowmeter with a self-diagnosis function.

[0020] In the figure: 1. casing; 2. rectifier; 3. front bearing; 4. impeller; 5. pressure sensor; 6. support; 7. volume corrector; 8. pulse sensor; 9. temperature sensor; 10. magnetic signal generating disk; 11. rear bearing; 12. first ultrasonic transducer; 13. second ultrasonic transducer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-Figure 3The embodiment of the utility model provides a turbine flowmeter with a self-diagnosis function, comprising: a shell 1 connected to a pipeline through a flange, wherein an inner cavity thereof is provided with a rectifier 2 for changing the gas flow state from turbulent flow to flat flow and a support 6 for supporting the rectifier 2 in sequence along the air inlet direction, so that the rear-end gas flow measurement is more accurate, the rectifier 2 is fixedly connected to the support 6 on the side away from the air inlet end, a shaft rod is movably connected at the center of the inner cavity of the support 6, and an impeller 4 is fixedly connected to the end of the shaft rod close to the rectifier 2, a metering component is provided in the inner cavity of the shell 1, and a first ultrasonic transducer 12 and a second ultrasonic transducer 13 are embedded in the bottom of the shell 1 and tilted in sequence along the air inlet direction.

[0023] Among them, the metering component includes a magnetic signal generating disk 10 installed on the end of the shaft away from the impeller 4. A pulse sensor 8 used in conjunction with the magnetic signal generating disk 10 is installed on the top of the shell 1. A through hole for the pulse sensor 8 to pass through is opened on the support 6. When the gas enters the inner cavity of the shell 1 and drives the impeller 4 to rotate, the magnetic signal generating disk 10 can rotate accordingly, and the pulse sensor 8 can collect effective pulse signals for metering operations.

[0024] Among them, the metering component also includes a pressure sensor 5 for measuring gas pressure and a temperature sensor 9 for measuring gas temperature, which are embedded in the top of the shell 1 in sequence along the air intake direction. The pulse sensor 8 is located between the pressure sensor 5 and the temperature sensor 9, and the pressure sensor 5 and the temperature sensor 9 are respectively located on both sides of the support 6.

[0025] Among them, the upper and lower parts of the outer surface of the shell 1 are provided with protective shells, and the volume corrector 7 electrically connected to the pressure sensor 5, the temperature sensor 9, the pulse sensor 8, the magnetic signal generating disk 10, the first ultrasonic transducer 12 and the second ultrasonic transducer 13 is installed on the upper protective shell. The volume corrector 7 is used to adjust the working status or parameters of the pressure sensor 5, the temperature sensor 9, the pulse sensor 8, the magnetic signal generating disk 10, the first ultrasonic transducer 12 and the second ultrasonic transducer 13, and receive the pressure signal emitted by the pressure sensor 5, the temperature signal emitted by the temperature sensor 9, the pulse signal emitted by the pulse sensor 8, the magnetic signal emitted by the magnetic signal generating disk 10, and the ultrasonic signal emitted by the first ultrasonic transducer 12 and the second ultrasonic transducer 13.

[0026] Among them, the first ultrasonic transducer 12 and the second ultrasonic transducer 13 are both arranged in the protective shell located below, and the first ultrasonic transducer 12 and the second ultrasonic transducer 13 are symmetrically arranged with respect to the protective shell located below, the pressure sensor 5, the pulse sensor 8 and the temperature sensor 9 are all arranged in the protective shell located above, and the shell 1 is provided with mounting holes adapted to the pressure sensor 5, the pulse sensor 8, the temperature sensor 9, the first ultrasonic transducer 12 and the second ultrasonic transducer 13, and the two ends of the mounting holes are respectively connected to the shell 1 and the inner cavity of the protective shell.

[0027] The protective shell is detachably mounted on the surface of the housing 1 by means of screws.

[0028] The two ends of the shaft surface are respectively installed with a front bearing 3 and a rear bearing 11 , and the two ends of the shaft are rotatably connected to the inner cavity of the support 6 through the front bearing 3 and the rear bearing 11 .

[0029] The housing 1 , the rectifier 2 and the impeller 4 are all located on the same axis.

[0030] The time calculation formula for the first ultrasonic transducer 12 and the second ultrasonic transducer 13 to go down and up in the housing 1 is as follows:

[0031] t1=(13.35*2+4L) / (C+vcosθ)(downstream)......①

[0032] t2=(13.35*2+4L) / (C-vcosθ)(upward)......②

[0033] Where:

[0034] t1——The time it takes for the ultrasonic wave to propagate downstream in the gas

[0035] t2——The time for ultrasonic wave to propagate in the gas in the countercurrent direction

[0036] 4L——The path length of the ultrasonic wave flowing through the measured flow channel

[0037] C——The speed of ultrasonic wave propagation in gas

[0038] V——Average axial velocity of the gas being measured

[0039] θ——Voice channel angle.

[0040] The working principle of the utility model is: when the gas flows through the impeller 4 through the rectifier 2, the impeller 4 is driven to rotate and the magnetic signal generating disk 10 on the shaft performs mechanical metering, and the pulse sensor 8 performs electronic metering pulse signal output. The flow velocity v of the gas in the flow channel measured by the turbine flow meter is in a linear ratio relationship with the rotation speed ω of the impeller 4 within a certain flow range;

[0041] When the turbine flowmeter fails, the impeller 4 stops rotating. At this time, the magnetic signal generating disk 10 has no mechanical metering output, and the pulse sensor 8 has no electronic metering pulse signal output, but the gas will still flow through the gaps between the blades of the impeller 4 and flow to the downstream of the turbine flowmeter without metering. At this time, the turbine flowmeter is equivalent to a straight pipe section with a large pressure loss. At this time, the first ultrasonic transducer 12 and the second ultrasonic transducer 13 installed on the housing 1 start to work. The first ultrasonic transducer 12 and the second ultrasonic transducer 13 control circuits transmit and receive ultrasonic waves at the time interval set by the program, record the ultrasonic downlink and uplink time t1, t2, and calculate the flow velocity v of the measured gas in the flowmeter cavity according to formula ① and formula ②;

[0042] a. From formula ① and ②, we get

[0043] t1=t2=(13.35*2+4L) / C......③

[0044] △t=t2-t1=0......④

[0045] According to formula ①, ②

[0046] The gas velocity v = 0 m / s

[0047] The downstream user of the turbine flowmeter is in a disabled state. Due to the lack of driving force, the impeller is in a stationary state, and there is no mechanical metering or electronic metering pulse output. At this time, the turbine flowmeter determines that it is working normally, and the user is in a temporarily disabled state.

[0048] b. The first ultrasonic transducer and the second ultrasonic transducer transmit and receive ultrasonic waves to detect the downlink and uplink times t1 and t2;

[0049] And △t=t2-t1>0

[0050] According to formula ①, ②

[0051] The gas velocity v>0 m / s

[0052] The turbine flowmeter is in a state of no mechanical measurement and no electronic pulse measurement output, and the gas is measured to be in a flowing state in the flow channel of the measured shell 1, then it is determined that the turbine flowmeter is damaged or faulty;

[0053] When the turbine flowmeter is in the normal mechanical metering and electronic pulse metering output state, the turbine flowmeter is considered to be working normally, and the first ultrasonic transducer 12 and the second ultrasonic transducer 13 control circuit are partially dormant to save power consumption; in order to reduce the false diagnosis of faults of the turbine flowmeter, when the first ultrasonic transducer 12 and the second ultrasonic transducer 13 control circuit detect v>0m / s, they perform repeated tests several times (3.5.7.....) within the set time interval, with probability a>50% as the standard.

[0054] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A turbine flowmeter with self-diagnosis function, characterized in that: include: A shell (1) is connected to a pipeline via a flange, and its inner cavity is provided with a rectifier (2) for changing the gas flow state from turbulent flow to flat flow and a support (6) for supporting the rectifier (2) in sequence along the air inlet direction; the rectifier (2) is fixedly connected to the support (6) at a side away from the air inlet end; a shaft is movably connected to the center of the inner cavity of the support (6); an end of the shaft close to the rectifier (2) is fixedly connected to an impeller (4); a metering component is provided in the inner cavity of the shell (1); and a first ultrasonic transducer (12) and a second ultrasonic transducer (13) are embedded in the bottom of the shell (1) in a tilted manner in sequence along the air inlet direction.

2. A turbine flowmeter with self-diagnosis function according to claim 1, characterized in that: The metering assembly comprises a magnetic signal generating disk (10) mounted on an end of the shaft away from the impeller (4); a pulse sensor (8) used in conjunction with the magnetic signal generating disk (10) is mounted on the top of the housing (1); and a through hole for the pulse sensor (8) to pass through is provided on the support (6).

3. The turbine flowmeter with self-diagnosis function according to claim 2, characterized in that: The metering assembly further comprises a pressure sensor (5) for measuring gas pressure and a temperature sensor (9) for measuring gas temperature, which are sequentially embedded in the top of the housing (1) along the air inlet direction; the pulse sensor (8) is located between the pressure sensor (5) and the temperature sensor (9); and the pressure sensor (5) and the temperature sensor (9) are respectively located on both sides of the support (6).

4. The turbine flowmeter with self-diagnosis function according to claim 3, characterized in that: The upper and lower parts of the outer surface of the shell (1) are both provided with protective shells, and the protective shell located at the upper part is provided with a volume corrector (7) electrically connected to the pressure sensor (5), the temperature sensor (9), the pulse sensor (8), the magnetic signal generating disk (10), the first ultrasonic transducer (12) and the second ultrasonic transducer (13). The volume corrector (7) is used to adjust the working state or parameters of the pressure sensor (5), the temperature sensor (9), the pulse sensor (8), the magnetic signal generating disk (10), the first ultrasonic transducer (12) and the second ultrasonic transducer (13), and to receive the pressure signal emitted by the pressure sensor (5), the temperature signal emitted by the temperature sensor (9), the pulse signal emitted by the pulse sensor (8), the magnetic signal emitted by the magnetic signal generating disk (10), and the ultrasonic signals emitted by the first ultrasonic transducer (12) and the second ultrasonic transducer (13).

5. The turbine flowmeter with self-diagnosis function according to claim 4, characterized in that: The first ultrasonic transducer (12) and the second ultrasonic transducer (13) are both arranged in a protective shell located at the bottom, and the first ultrasonic transducer (12) and the second ultrasonic transducer (13) are symmetrically arranged with respect to the protective shell located at the bottom, the pressure sensor (5), the pulse sensor (8) and the temperature sensor (9) are all arranged in the protective shell located at the top, and the shell (1) is provided with mounting holes adapted to the pressure sensor (5), the pulse sensor (8), the temperature sensor (9), the first ultrasonic transducer (12) and the second ultrasonic transducer (13), and the two ends of the mounting holes are respectively connected to the shell (1) and the inner cavity of the protective shell.

6. The turbine flowmeter with self-diagnosis function according to claim 5, characterized in that: The protective shell is detachably mounted on the surface of the housing (1) by means of screws.

7. The turbine flowmeter with self-diagnosis function according to claim 1, characterized in that: A front bearing (3) and a rear bearing (11) are respectively mounted on the two ends of the shaft surface, and the two ends of the shaft are rotatably connected to the inner cavity of the support (6) via the front bearing (3) and the rear bearing (11).

8. The turbine flowmeter with self-diagnosis function according to claim 1, characterized in that: The housing (1), the rectifier (2) and the impeller (4) are all located on the same axis.

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