CN219589733U

CN219589733U - Anti-interference liquid turbine flowmeter

Info

Publication number: CN219589733U
Application number: CN202320420567.9U
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: 2023-08-25
Anticipated expiration: 2033-03-07

Abstract

The utility model discloses an anti-interference liquid turbine flowmeter, and relates to the field of instruments and meters. The meter comprises a meter body, a front deflector, a rear deflector, a turbine component, a detection probe and a converter, wherein the two ends of the meter body adopt flange structures, a fluid channel is straight-through, and the middle section of the fluid channel is a turbine cavity; two probe mounting holes are formed in the outer wall of the meter body at positions corresponding to the turbines; the front deflector is rotatably arranged at one side of the inlet end of the fluid channel in the meter body, the rear deflector is rotatably arranged at one side of the outlet end of the fluid channel in the meter body, and the front deflector and the rear deflector are coaxially arranged with the fluid channel; the turbine component is arranged in the turbine cavity, and the detection probe is connected with the converter through a circuit. The utility model can improve the detection precision and reliability of the turbine flowmeter in a complex electromagnetic interference environment.

Description

Anti-interference liquid turbine flowmeter

Technical Field

The utility model relates to the field of instruments and meters, in particular to an anti-interference liquid turbine flowmeter.

Background

The turbine flowmeter is one kind of flow meter and is one kind of speed flowmeter, and has the principle that one turbine is set in the center of pipeline and two ends are supported with 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 can be used for measuring the flow rate of fluids such as a gaseous medium, a liquid and the like; the 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. However, since the turbine flowmeter needs to rely on turbine blade rotation to cut magnetic induction lines to achieve non-contact signal detection, electromagnetic interference problems easily affect the accuracy of the flowmeter. The poor anti-electromagnetic interference capability is common practice of the turbine flowmeter, and the influence of an external magnetic field on the measuring precision of the flowmeter can be reduced by arranging a shielding cover and the like; however, the interference generated by the transformed magnetic field transmitted from the flowmeter source still cannot be effectively solved.

In summary, the utility model provides an anti-interference liquid turbine flowmeter.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model aims to provide an anti-interference liquid turbine flowmeter, which can improve the detection precision and reliability of the turbine flowmeter in a complex electromagnetic interference environment.

In order to achieve the above object, the present utility model is realized by the following technical scheme: an anti-interference liquid turbine flowmeter comprises a meter body, a front flow director, a rear flow director, a turbine component, a detection probe and a converter, wherein flange structures are adopted at two ends of the meter body, a fluid channel is in a straight-through type, and a turbine cavity is arranged in the middle section of the fluid channel; two probe mounting holes are formed in the outer wall of the meter body at positions corresponding to the turbines; the front deflector is rotatably arranged at one side of the inlet end of the fluid channel in the meter body, the rear deflector is rotatably arranged at one side of the outlet end of the fluid channel in the meter body, and the front deflector and the rear deflector are coaxially arranged with the fluid channel; the turbine component is arranged in the turbine cavity, and the detection probe is connected with the converter through a circuit.

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

Preferably, the detection probe comprises a first probe and a second probe, the types of the two probes are completely consistent, the detection probe is used for detecting feedback signals generated by the turbine in the turbine cavity along with the movement of the fluid, and the feedback signals are a group of pulse signals.

Preferably, the two probe mounting holes are at the same radial position of the measuring tube and are deflected by an angle which is required to satisfy the following conditions: when the first probe receives the strongest forward feedback signal obtained by the magnetic force lines cut by the turbine blade, the second probe can receive the strongest backward feedback signal when the turbine blade cuts the magnetic force lines.

Preferably, the feedback signals received by the first probe and the second probe are transmitted to the converter through a line, and the two pulse signals keep a constant 180-degree phase difference.

The utility model has the following beneficial effects: the turbine flowmeter provided by the utility model adopts the structural design of a single turbine and double probes; the double probes are arranged at positions where phase difference signals of the impellers can be collected, and the signal processing module is used for collecting two synchronous detection signals with phase difference, so that interference signals in the signals are eliminated in the signal processing process of different detection signals, and the detection precision and reliability of the turbine flowmeter under a complex electromagnetic interference environment are improved. The turbine flowmeter has very excellent performance, overcomes the inherent defects of the turbine flowmeter, and improves the market application prospect of the turbine flowmeter.

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 schematic diagram of the relative positions of the probe and the impeller of the present utility model;

fig. 3 is a schematic diagram of a phase difference between two pulse signals according to the present utility model.

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: an anti-interference liquid turbine flowmeter comprises a meter body 1, a front flow director 2, a rear flow director 3, a turbine component 4, a detection probe 5 and a converter 7, wherein two ends of the meter body 1 are provided with flanges, the two ends of the meter body 1 are provided with flange structures, a fluid channel is in a straight-through type, and the middle section of the fluid channel is a turbine cavity; two probe mounting holes are formed in the outer wall of the meter body 1 at positions corresponding to the turbines; a detection probe 5 is arranged in the probe mounting hole, the front deflector 2 is rotatably arranged on one side of the inlet end of the fluid channel in the meter body 1, the rear deflector 3 is rotatably arranged on one side of the outlet end of the fluid channel in the meter body 1, and the front deflector 2, the rear deflector 3 and the fluid channel are coaxially arranged; the turbine assembly 4 is installed in the turbine chamber, and the detection probe 5 is connected with the converter 7 through a circuit.

It is noted that the turbine assembly 4 includes a turbine 4-1, a turbine shaft 4-2 and two bearings 4-3, wherein one end of the turbine shaft 4-2 is connected to the front deflector 2 through the bearing 4-3, and the other end is connected to the rear deflector 3 through the bearing 4-3, and the three are coaxially disposed. The turbine 4-1 is provided with precisely machined blades, the blades are arranged on the turbine shaft 4-2 and form a turbine assembly together with the front bearing 4 and the rear bearing 3, and the front bearing and the rear bearing of the turbine 4-1 are coaxially arranged.

It is noted that the detection probe 5 includes a first probe 5-1 and a second probe 5-2 mounted in a probe mounting hole on an outer wall of the meter body, and the first probe 5-1 and the second probe 5-2 are respectively used for receiving feedback signals generated by the turbine 4-1 in the turbine cavity along with fluid movement. The first probe 5-1 and the second probe 5-2 are arranged at the same radial position of the measuring tube and deflect by a certain angle, and the angle is required to satisfy the following conditions: when the first probe 5-1 receives the strongest forward feedback signal obtained by the magnetic force lines cut by the turbine blade, the second probe 5-2 can receive the strongest backward feedback signal when the turbine blade cuts the magnetic force lines. The first probe 5-1 and the second probe 5-2 are identical, and comprise permanent magnets and coils, wherein the permanent magnets are used for generating magnetic fields near corresponding impellers, and the coils are used for receiving feedback signals generated by magnetic induction lines of the cutting magnetic fields in the rotation process of the impellers in the double-impeller assembly 4.

The communication cables of the first probe 5-1 and the second probe 5-2 are connected with the converter 7 through the three-way connector 6, the received feedback signals are transmitted to the converter 7, and the converter 7 outputs corresponding flow detection data according to the feedback signals. The data processing procedure of the converter 7 includes the following procedures: let the probe number one receive S ₁ When the signal is the peak signal V+, S is received by the probe II ₂ The signal is the trough signal V-and the potential difference is 2V, there is an interference signal when the strongest signal of the interference signal is A, then the signal S received by the probe number one ₁ V++ A, signal S received by probe number two ₂ V is +A, the potential difference is also 2S ₁ . When the feedback signals received by the first probe and the second probe are two signals which are 180 degrees different, the converter counts the current pulse signals, and the interference signals can be effectively counteracted.

The turbine flowmeter of the specific embodiment adopts the structural design of a single turbine and double probes; the double probes are arranged at positions where the phase difference signals of the impellers can be collected, and then two synchronous detection signals with phase differences can be collected through the signal processing module, and then interference signals in the signals are eliminated in the signal processing process of different detection signals, so that the detection precision and reliability of the turbine flowmeter under the complex electromagnetic interference environment are improved. The turbine flowmeter has very excellent performance, overcomes the inherent defects of the turbine flowmeter, and improves the market application prospect of the turbine flowmeter.

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 anti-interference liquid turbine flowmeter is characterized by comprising a meter body (1), a front flow director (2), a rear flow director (3), a turbine component (4), a detection probe (5) and a converter (7), wherein flange structures are adopted at two ends of the meter body (1), a fluid channel is in a straight-through type, and a turbine cavity is arranged in the middle section of the fluid channel; two probe mounting holes are formed in the outer wall of the meter body (1) at positions corresponding to the turbines; a detection probe (5) is arranged in the probe mounting hole, the front deflector (2) is rotatably arranged at one side of the inlet end of the fluid channel in the meter body (1), the rear deflector (3) is rotatably arranged at one side of the outlet end of the fluid channel in the meter body (1), and the front deflector (2), the rear deflector (3) and the fluid channel are coaxially arranged; the turbine component (4) is arranged in the turbine cavity, and the detection probe (5) is connected with the converter (7) through a circuit.

2. An anti-interference liquid turbine flowmeter according to claim 1, characterized in that the turbine (4-1) of the turbine assembly (4) is provided with precisely machined blades, the blades are mounted on the turbine shaft (4-2) and form the turbine assembly together with the front bearing and the rear bearing (4-3), one end of the turbine shaft (4-2) is connected to the front deflector (2) through the bearing (4-3), the other end is connected to the rear deflector (3) through the bearing (4-3), and the front deflector (2), the rear deflector (3) and the bearing (4-3) are coaxially arranged.

3. An anti-interference liquid turbine flowmeter according to claim 1, characterized in that the detection probe (5) comprises a first probe (5-1) and a second probe (5-2), the two probes being identical in type and being used for detecting feedback signals generated by a turbine in a turbine cavity along with fluid movement, the feedback signals being a set of pulse signals.

4. The tamper resistant fluid turbine flowmeter of claim 1, wherein the two probe mounting holes are at the same radial position of the measurement tube and are offset by an angle of: when the first probe (5-1) receives the strongest forward feedback signal obtained by the magnetic force lines cut by the turbine blade, the second probe (5-2) can receive the strongest backward feedback signal when the magnetic force lines cut by the turbine blade.

5. The anti-interference liquid turbine flowmeter of claim 4, wherein the feedback signals received by the first probe (5-1) and the second probe (5-2) are transmitted to the converter via a line, and the two pulse signals maintain a constant 180 ° phase difference.