CN216348863U

CN216348863U - Flow measuring device

Info

Publication number: CN216348863U
Application number: CN202122854688.8U
Authority: CN
Inventors: 刘冬冬; 李星萍; 段勇亮; 刘冲冲; 李松松; 陈天杰; 江希; 韩代椿; 杜春雨; 杨波; 王智; 胡路平
Original assignee: China Helicopter Research and Development Institute
Current assignee: China Helicopter Research and Development Institute
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-04-19
Anticipated expiration: 2031-11-19

Abstract

The utility model discloses a flow measuring device, which comprises a shell, a converter, a Wils bidirectional turbine, a rectifier, a brushless motor and a constant-resistance resistor, wherein: the Wils bidirectional turbine adopts symmetrical wings and is arranged in the shell, and the rectifying pieces are arranged on two sides of the Wils bidirectional turbine and are used for rectifying incoming flow and simultaneously improving the incoming flow speed; the brushless motor is arranged in the rectifying piece and extends out of the rectifying piece through the torque rotating speed sensor to be fixedly connected with the Wils bidirectional turbine; the brushless motor is externally connected with a constant resistance resistor; and the rotating speed signal and the torque signal of the Weiersi bidirectional turbine are measured by a torque rotating speed sensor and are sent to a converter for storage and calculation. The bidirectional turbine, namely the Wils turbine and the bidirectional impact turbine, is arranged, so that the problem that the flow direction of the fluid needs to be distinguished in the conventional turbine flowmeter is solved, the problem that the fluid type needs to be distinguished is avoided, and the bidirectional impact turbine can be applied to different types of gas and liquid.

Description

Flow measuring device

Technical Field

The utility model relates to the field of flow measurement, in particular to a flow measurement device which has no relation to the incoming flow direction and is suitable for gas or liquid.

Background

The turbine flowmeter, as a speed type flowmeter, has the advantages of high precision, good repeatability, simple structure, long service life, simple operation, convenient maintenance and the like. The working principle of the turbine impeller utilizes the electromagnetic induction phenomenon, namely when fluid passes through a turbine flowmeter, an impeller is stressed to rotate under the action of the fluid, and the rotating speed of the impeller is in direct proportion to the average flow velocity of the fluid in a pipeline. The periodical rotation of the blades changes the reluctance value of the magnetoelectric converter, the magnetic flux in the detection coil is periodically changed, a periodical potential signal is induced in the detection coil according to the electromagnetic induction principle, so that the rotating speed of the turbine is converted into a potential signal with corresponding frequency, the frequency of the potential signal is in direct proportion to the rotating speed of the turbine, and finally, the corresponding fluid speed and flow can be calculated through the frequency of the potential signal.

Turbine flowmeters also suffer from several disadvantages:

the turbine flowmeter is required to be installed in a strict and predetermined direction, that is, the fluid flows in from one end of the flowmeter and flows out from the other end of the flowmeter, and if the direction of the fluid is reversed, the impeller and the bearing of the turbine flowmeter are damaged, so that the flowmeter cannot be used and the service life of the flowmeter is reduced. And for some occasions of measuring flow, the flow direction of fluid in the pipeline can be correspondingly reversed according to needs, and at the moment, a single turbine flowmeter cannot meet the requirements.

The turbine flowmeter which needs to strictly distinguish liquid from gas, namely, the liquid turbine flowmeter and the gas turbine flowmeter cannot be used in a mixed way, because the density of the gas is far less than that of the liquid, so that the gas turbine flowmeter is remarkably different from the liquid turbine flowmeter in structure, the complexity of the turbine flowmeter is greatly increased, and the universality of the turbine flowmeter is limited.

Disclosure of Invention

The utility model aims to provide a flow measuring device which is used for overcoming the problem that the flow direction of fluid needs to be distinguished in the conventional turbine flow meter.

In order to realize the task, the utility model adopts the following technical scheme:

a flow measuring device comprising a housing, a converter, a wils bidirectional turbine, a rectifier, a brushless motor, and a constant resistance resistor, wherein:

the Wils bidirectional turbine adopts symmetrical wings and is arranged in the shell, and the rectifying pieces are arranged on two sides of the Wils bidirectional turbine and are used for rectifying incoming flow and simultaneously improving the incoming flow speed; the brushless motor is arranged in the rectifying piece and extends out of the rectifying piece through the torque rotating speed sensor to be fixedly connected with the Wils bidirectional turbine; the brushless motor is externally connected with a constant resistance resistor; and the rotating speed signal and the torque signal of the Weiersi bidirectional turbine are measured by a torque rotating speed sensor and are sent to a converter for storage and calculation.

Further, the axial direction of the Wils bidirectional turbine is perpendicular to the axial direction of the housing.

Further, the resistance value of the constant resistance resistor is 1-5 omega.

Further, the converter is arranged outside the shell and used for receiving the rotating speed signal and the torque signal through the data lead.

Further, the wils bidirectional turbine is replaced with a bidirectional impulse turbine.

Furthermore, a group of guide vanes are arranged on two sides of the bidirectional impact turbine and used for guiding the fluid rectified by the rectifying piece.

Compared with the prior art, the utility model has the following technical characteristics:

the utility model solves the problem that the flow direction of the fluid needs to be distinguished by the traditional turbine flowmeter by arranging the bidirectional turbines, namely the Wils turbine and the bidirectional impact turbine, and simultaneously calculates and obtains the corresponding fluid speed through the corresponding shaft power generated by the turbine through the brushless motor, the torque rotating speed sensor and the external constant resistance, thereby avoiding the problem that the fluid types need to be distinguished, and the utility model can be applied to different types of gas and liquid. The turbine flowmeter greatly expands the application range of the existing turbine flowmeter and has greater application advantages in the aspects of fluid speed and quality measurement.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of the present invention;

fig. 2 is a schematic structural diagram of another embodiment of the present invention.

The reference numbers in the figures illustrate: the device comprises a shell 1, a converter 2, a 3 Wils bidirectional turbine, a 4 rectifier, a 5 brushless motor, a 6 resistor, a 7 torque and speed sensor, an 8 guide vane and a 9 bidirectional impulse turbine.

Detailed Description

Fig. 1 shows a flow rate measuring device according to an embodiment of the present invention, which includes a housing 1, a converter 2, a wils bidirectional turbine 3, a rectifier 4, a brushless motor 5, and a constant resistance resistor 6; the Wils bidirectional turbine 3 adopts symmetrical wings and is arranged in the shell 1, and the axial direction of the Wils bidirectional turbine 3 is vertical to the axial direction of the shell 1; the rectifying pieces 4 are arranged on two sides of the Wils bidirectional turbine 3 and used for rectifying the incoming flow and increasing the incoming flow speed so as to increase the rotating speed of the turbine. The brushless motor 5 is arranged in the rectifying piece 4 and extends out of the rectifying piece through the torque rotating speed sensor 7 to be fixedly connected with the Wils bidirectional turbine 3; the brushless motor 5 is externally connected with a constant resistance resistor 6, and the range of the resistance value is 1-5 omega. The rotating speed signal and the torque signal of the Weiersi bidirectional turbine 3 are measured by a torque rotating speed sensor 7 and sent to the converter 2 for storage and calculation. The converter 2 is arranged outside the housing and receives the signals through a data conductor.

The principle of the flow measuring device is as follows: when fluid flows into any one side of the shell 1, the rectification and the speed increasing of the incoming flow passing through the rectification piece 4 can enable the Wils bidirectional turbine 3 to rotate in one direction, and the speed of the incoming flow is in direct proportion to the rotating speed of the Wils bidirectional turbine 3. The unidirectional rotation of the Wils bidirectional turbine 3 drives the brushless motor 5 to rotate in a unidirectional way through the torque rotating speed sensor 7, the electromagnetic induction is utilized to generate electricity, and the generated electric rate is consumed on the external constant resistance value resistor 6; the rotating speed and the shaft work of the Wils bidirectional turbine 3 can be directly obtained through the torque rotating speed sensor 7. Under the corresponding rotating speed, the shaft work of the turbine and the incoming flow speed are in a single-value corresponding relation, so that the incoming flow speed can be obtained through the shaft power. And finally, calculating through three numerical values of the speed, the density and the sectional area to obtain the mass flow of the fluid.

Fig. 2 shows another embodiment of the present invention, which is different from the previous embodiment in that the wils bidirectional turbine 3 is replaced by a bidirectional impulse turbine 9, which is the same as the conventional single-stage axial flow impulse turbine, and a set of guide vanes 8 are provided on both sides of the bidirectional impulse turbine 9 for guiding the fluid rectified by the rectifying member 4, so as to impact the bidirectional impulse turbine 9 to rotate in one direction, compared with the wils bidirectional turbine, for the working condition of high flow rate, the bidirectional impulse turbine still has higher efficiency and no stall phenomenon, so the flow measuring device based on the bidirectional impulse turbine 9 is more advantageous in the field of high flow rate measurement. Except for the bidirectional impact turbine 9 and the addition of the guide vane 8, the rest of the structure and the working principle of the embodiment are the same as those of the previous embodiment, and are not described again.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equally replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application, and are intended to be included within the scope of the present application.

Claims

1. A flow measuring device, comprising a housing (1), a converter (2), a wils bidirectional turbine (3), a rectifier (4), a brushless motor (5), and a constant-resistance resistor (6), wherein:

the Wils bidirectional turbine (3) adopts symmetrical wings and is arranged in the shell (1), and the rectifying pieces (4) are arranged on two sides of the Wils bidirectional turbine (3) and are used for rectifying incoming flow and simultaneously improving the incoming flow speed; the brushless motor (5) is arranged inside the rectifying piece (4) and extends out of the rectifying piece through the torque rotating speed sensor (7) to be fixedly connected with the Wils bidirectional turbine (3); the brushless motor (5) is externally connected with a constant resistance resistor (6); the rotating speed signal and the torque signal of the Weiersi bidirectional turbine (3) are measured by a torque rotating speed sensor (7) and are sent to the converter (2) for storage and calculation.

2. Flow measuring device according to claim 1, characterized in that the axial direction of the wils bidirectional turbine (3) is perpendicular to the axial direction of the housing (1).

3. A flow measuring device according to claim 1, characterized in that the resistance value of the constant-resistance resistor (6) is 1-5 Ω.

4. Flow measuring device according to claim 1, characterized in that the converter (2) is placed outside the housing and receives the rotation speed signal and the torque signal via data conductors.

5. Flow measuring device according to claim 1, characterized in that the wils bidirectional turbine (3) is replaced by a bidirectional impulse turbine (9).

6. Flow measuring device according to claim 5, characterized in that a set of guide vanes (8) is provided on both sides of the two-way impulse turbine (9) for guiding the fluid rectified by the rectifying member (4).