CN219608111U

CN219608111U - High-precision multi-runner turbine flowmeter

Info

Publication number: CN219608111U
Application number: CN202320420495.8U
Authority: CN
Inventors: 王战友
Original assignee: SHANGHAI ANGJI INSTRUMENT TECHNOLOGY CO LTD
Current assignee: SHANGHAI ANGJI INSTRUMENT TECHNOLOGY CO LTD
Priority date: 2023-03-07
Filing date: 2023-03-07
Publication date: 2023-08-29
Anticipated expiration: 2033-03-07

Abstract

The utility model discloses a high-precision multi-channel turbine flowmeter, and relates to the technical field of flow metering devices. The internal fluid channel of the meter body is divided into three independent channels, the middle section of each independent channel is provided with a turbine cavity, and the turbine component is arranged in the turbine cavity; the outer wall of the meter body is provided with a probe mounting hole corresponding to the positions of the three turbines respectively, and the detection probe is arranged in the probe mounting hole; a front deflector is rotatably arranged on one side of the inlet end of the fluid channel in each independent channel, a rear deflector is rotatably arranged on one side of the outlet end of the fluid channel in each independent channel, and the front deflector and the rear deflector are coaxially arranged with the fluid channel; the top of the meter body is provided with a converter, and three detection probes are connected with the converter through four-way connectors. The utility model improves the calculation precision of the turbine flowmeter, realizes the redundant control of the flowmeter, eliminates the influence on the measurement precision of the turbine flowmeter caused by impurities contained in a measured medium, and has high reliability.

Description

High-precision multi-runner turbine flowmeter

Technical Field

The utility model relates to the technical field of flow metering devices, in particular to a high-precision multi-channel turbine flowmeter.

Background

The turbine flowmeter is one kind of flow meter, and may be used in measuring the flow rate of gas medium, liquid, etc. The principle of the turbine flowmeter is that a turbine is arranged in the center of a pipeline, and two ends of the turbine are supported by bearings. When fluid passes through the pipeline, the fluid impacts the turbine blades, and a driving moment is generated on the turbine, so that the turbine overcomes friction moment and fluid resistance moment to rotate. The rotational angular velocity of the turbine is proportional to the fluid flow rate for a given fluid medium viscosity over a given flow range. Thus, the fluid flow rate can be obtained from the rotational angular velocity of the turbine, and the fluid flow rate through the pipe can be calculated.

The rotational speed of the turbine is detected by a sensor coil mounted outside the housing. When the turbine blade cuts the magnetic lines of force generated by the permanent magnet steel in the housing, a change in the magnetic flux in the sensing coil is caused. The sensing coil sends the detected magnetic flux periodic variation signal to the pre-amplifier, amplifies and shapes the signal, generates a pulse signal proportional to the flow velocity, and sends the pulse signal to the unit conversion and flow integrating circuit to obtain and display the accumulated flow value; meanwhile, the pulse signal is sent to the frequency-current conversion circuit to convert the pulse signal into an analog current quantity, so as to indicate the instantaneous current value.

The turbine flowmeter has the advantages of compact structure, high reliability, relatively low cost, lightning resistance, less influence by external factors such as temperature and the like, and in actual work, the accuracy of the turbine flowmeter is often reduced compared with that of the turbine flowmeter when the turbine flowmeter is installed after the turbine flowmeter is used for a period of time, and the turbine flowmeter is mainly caused by the following two reasons:

(1) The measured medium is generally provided with some impurities, so that the bearing and the shaft of the turbine flowmeter are worn, the gap between the bearing and the shaft is increased, the dynamic balance of the moving part is destroyed, the rotating speed is reduced, or dirt enters the gap, so that the movement resistance is increased, and the rotating speed is reduced;

(2) Fibrous or viscous impurities in the fluid attach to the rotating part of the flowmeter, increasing the rotational resistance, which causes the displayed value of the meter to decrease and negative errors to occur.

In order to solve the problem that impurities contained in a measured medium in the prior art affect the measurement precision of the turbine flowmeter, it is particularly necessary to design a novel high-precision multi-channel turbine flowmeter.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model aims to provide the high-precision multi-flow-channel turbine flowmeter, which has reasonable structural design, improves the calculation precision of the turbine flowmeter, realizes the redundant control of the flowmeter, eliminates the influence on the measurement precision of the turbine flowmeter caused by impurities in a measured medium, has high reliability and is easy to popularize and use.

In order to achieve the above object, the present utility model is realized by the following technical scheme: the utility model provides a high accuracy multichannel turbine flowmeter, includes table body, turbine subassembly, preceding water conservancy diversion, back water conservancy diversion, test probe, cross connector and converter, and the interior fluid passage of table divide into three independent passageway that the area is the same, and independent passageway is straight-through, and the middle section of every independent passageway all is equipped with a turbine chamber, and turbine subassembly installs in this turbine chamber, and each turbine subassembly model is unanimous; the turbine component consists of a turbine, a turbine shaft and a bearing, and the turbine is connected with the bearing through the turbine shaft; the outer wall of the meter body is provided with a probe mounting hole corresponding to the three turbines, and the detection probes are arranged in the probe mounting holes; a front deflector is rotatably arranged on one side of the inlet end of the fluid channel in each independent channel, a rear deflector is rotatably arranged on one side of the outlet end of the fluid channel in each independent channel, and the front deflector and the rear deflector are coaxially arranged with the fluid channel; the top of the meter body is provided with a converter, and three detection probes are connected with the converter through four-way connectors.

Preferably, the three probe mounting holes on the outer wall of the meter body are arranged at the same radial position of the measuring tube and are trisected, and are respectively 120 degrees apart.

Preferably, the turbine is provided with a plurality of blades, the blades are arranged on a turbine shaft and form a turbine assembly together with a front bearing and a rear bearing, one end of the turbine shaft is connected to the front deflector through the bearings, the other end of the turbine shaft is connected to the rear deflector through the bearings, and the front bearing and the rear bearing are coaxially arranged with the front deflector and the rear deflector.

Preferably, the types of the detection probes are consistent, the detection probes are used for detecting feedback signals generated by the turbine in the turbine cavity along with the movement of the fluid, the feedback signals are a group of pulse signals, and the feedback signals detected by the detection probes are transmitted to the converter circuit through the circuit. When the flowmeter works normally, the frequencies and the amplitudes of the three pulse signals are basically the same, and the converter counts three signals at the moment so as to calculate the flow; assuming that the turbine in one path is slow in rotation speed or even blocked and not rotated due to the influence of impurities in the fluid, the pulse signals received by the detection probes become small, and the converter is based on the other two detection probes and the detected pulse signals and reminds a customer to detect and repair the flowmeter.

Preferably, the two ends of the watch body adopt flange structures.

The utility model has the beneficial effects that: the device realizes redundant control of the flowmeter, effectively eliminates the influence on the measurement precision of the turbine flowmeter due to the impurity contained in the measured medium, greatly improves the calculation precision of the turbine flowmeter, and has high reliability, strong practicability and wide application prospect.

Drawings

The utility model is described in detail below with reference to the drawings and the detailed description;

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is a right side view of fig. 1.

Detailed Description

The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

Referring to fig. 1-2, the present embodiment adopts the following technical scheme: the utility model provides a high accuracy multichannel turbine flowmeter, including table body 1, turbine subassembly 2, preceding director 3, back director 4, test probe 5, cross connector 6 and converter 7, the both ends of table body 1 adopt flange formula structure, the inside fluid passage of table body 1 divide into three independent passageway 8 that the area is the same, independent passageway 8 is the through, the middle section of every independent passageway 8 all is equipped with a turbine chamber, the structure size of three turbine chambers is unanimous, turbine subassembly 2 is installed in the turbine chamber, each turbine subassembly 2, the model of test probe 5 is unanimous; the outer wall of the meter body 1 is provided with a probe mounting hole corresponding to the positions of the three turbines 2-1, and the detection probe 5 is arranged in the probe mounting hole; a front deflector 3 is rotatably arranged on one side of the inlet end of the fluid channel in each independent channel 8, a rear deflector 4 is rotatably arranged on one side of the outlet end of the fluid channel in each independent channel 8, and the front deflector 3 and the rear deflector 4 are coaxially arranged with the fluid channel; the top of the meter body 1 is provided with a converter 7, and three detection probes 5 are connected with the converter 7 through four-way connectors 6.

It is noted that the turbine component 2 is respectively installed in the turbine cavity of the independent channel 8, and is composed of a turbine 2-1, a turbine shaft 2-2 and a bearing 2-3, a plurality of precisely machined blades are arranged on the turbine 2-1, the blades are installed on the turbine shaft 2-2 and form the turbine component together with the front bearing 2-3 and the rear bearing 2-3, one end of the turbine shaft 2-2 is connected to the front deflector 3 through the bearing 2-3, the other end of the turbine shaft 2-2 is connected to the rear deflector 4 through the bearing 2-3, and the front bearing 2-3 and the rear bearing 2-3 are coaxially arranged with the front deflector 3 and the rear deflector 4.

In addition, the three probe mounting holes on the outer wall of the meter body 1 are arranged at the same radial position of the measuring tube and are trisected, and are respectively 120 degrees apart.

In the specific embodiment, the internal fluid channel of the flowmeter is divided into three independent channels 8 with the same area, and each independent channel 8 is internally provided with a turbine component 2 and a detection probe 5, so that a three-turbine and three-probe structure is realized. The turbine component 2 and the detection probe 5 are completely identical in model, the detection probe 5 is used for detecting feedback signals generated by the turbine in the turbine cavity along with the movement of the fluid, the feedback signals are a group of pulse signals, and the feedback signals detected by the detection probe 5 are transmitted to the converter circuit through the four-way connector 6 by a circuit.

(1) When the flowmeter is in a normal working state, the frequency and the amplitude of pulse signals detected by the three detection probes 5 are basically the same, and the converter 7 counts three signals to calculate the flow, wherein the flow calculation formula is that,

Q＝f ₁ /K ₁ +f ₂ /K ₂ +f ₃ /K ₃ (1)

Q in the formula (1) is volume flow, f ₁ 、f ₂ 、f ₃ For each pulse frequency, K, detected correspondingly by each probe ₁ 、K ₂ 、K ₃ And for the instrument coefficient corresponding to the sensor, three paths of flow summation are used, so that the calculation accuracy of the flowmeter is effectively improved.

(2) When the turbine component in a certain channel fails due to impurities in the measured medium, the turbine is affected by the impurities in the fluid, the rotation speed is slowed down or even blocked, the pulse signals received by the corresponding detection probes are reduced, the converter 7 takes the pulse signals detected by the other two detection probes as the reference, and the flow rate calculation formula at the moment is as follows

Q＝(f ₁ /K ₁ +f ₂ /K ₂ )/2×3 (2)

Further realizing redundant control of the flowmeter and eliminating influence on the measurement precision of the turbine flowmeter due to impurities contained in the measured medium; meanwhile, the converter 7 can send out warning information to remind a customer to detect and repair the flowmeter, so that the self-checking function is achieved.

The specific embodiment solves the problem that the measured medium contains impurities and affects the measurement precision of the turbine flowmeter, the precision is not affected even if the measured medium is used for a long time, the precision of the turbine flowmeter is greatly improved, the method is reliable and practical, and the market application prospect of the turbine flowmeter is effectively expanded.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a high accuracy multichannel turbine flowmeter which characterized in that, including table body (1), turbine subassembly (2), preceding water conservancy diversion ware (3), back water conservancy diversion ware (4), test probe (5), cross connector (6) and converter (7), the inside fluid channel of table body (1) divide into three independent passageway (8) that the area is the same, independent passageway (8) are through-type, the middle section of every independent passageway (8) all is equipped with a turbine chamber, turbine subassembly (2) are installed in this turbine chamber, each turbine subassembly (2) model is unanimous; the turbine assembly (2) consists of a turbine (2-1), a turbine shaft (2-2) and a bearing (2-3), wherein the turbine (2-1) is connected with the bearing (2-3) through the turbine shaft (2-2); the outer wall of the meter body (1) is provided with a probe mounting hole corresponding to the positions of the three turbines (2-1), the detection probes (5) are arranged in the probe mounting holes, and the types of the detection probes (5) are consistent; a front deflector (3) is rotatably arranged on one side of the inlet end of the fluid channel in each independent channel (8), a rear deflector (4) is rotatably arranged on one side of the outlet end of the fluid channel in each independent channel (8), and the front deflector (3) and the rear deflector (4) are coaxially arranged with the fluid channel; the top of the meter body (1) is provided with a converter (7), and three detection probes (5) are connected with the converter (7) through four-way connectors (6).

2. The high-precision multi-flow-channel turbine flowmeter according to claim 1, wherein the three probe mounting holes on the outer wall of the meter body (1) are arranged at the same radial position of the measuring tube and are trisected, and are respectively 120 degrees apart.

3. The high-precision multi-flow-channel turbine flowmeter according to claim 1, wherein a plurality of blades are arranged on the turbine (2-1), the blades are arranged on a turbine shaft (2-2) and form a turbine assembly (2) together with a front bearing and a rear bearing (2-3), one end of the turbine shaft (2-2) is connected to the front flow director (3) through the bearing (2-3), the other end of the turbine shaft (2-2) is connected to the rear flow director (4) through the bearing (2-3), and the front bearing and the rear bearing (2-3) are coaxially arranged with the front flow director (3) and the rear flow director (4).

4. The high-precision multi-channel turbine flowmeter of claim 1, wherein the two ends of the meter body (1) adopt flange structures.