阅读说明：本技术 宽量程流量稳定性测试装置 (Wide-range flow stability testing device ) 是由 安清源 马洪虎 张伟治 杨康奋 程满满 张欣 于 2020-06-01 设计创作，主要内容包括：本发明公开了一种宽量程流量稳定性测试装置,包括流量稳定性测试部件,流量稳定性测试部件包括：光信号发射器、光信号接收器、图像识别器；光信号发射器,用于发出光信号并穿透锥形管的一侧壁后,被浮子遮挡一部分,继续穿过锥形管的另一侧壁后投影到光信号接收器,光信号在光信号接收器上形成一影斑；光信号接收器,用于接收影斑,其中影斑会随着流体的流量大小在光信号接收器上上下波动；图像识别器,所述图像识别器用于对所述影斑的垂直位置量进行识别,并对所述垂直位移量进行分析处理。本发明是一种能够准确分析流量稳定性的宽量程流量稳定性测试装置。(The invention discloses a wide-range flow stability testing device, which comprises a flow stability testing component, wherein the flow stability testing component comprises: the device comprises an optical signal transmitter, an optical signal receiver and an image recognizer; the optical signal transmitter is used for transmitting an optical signal, penetrates through one side wall of the conical tube, is partially shielded by the floater, continuously penetrates through the other side wall of the conical tube and then is projected to the optical signal receiver, and the optical signal forms a shadow spot on the optical signal receiver; the optical signal receiver is used for receiving the shadow spots, wherein the shadow spots can fluctuate up and down on the optical signal receiver along with the flow of the fluid; and the image recognizer is used for recognizing the vertical position quantity of the shadow spots and analyzing and processing the vertical displacement quantity. The invention relates to a wide-range flow stability testing device capable of accurately analyzing flow stability.)

1. A wide range flow stability testing apparatus for monitoring the flow stability of a fluid flowing through a pipeline, comprising: the conical tube, the conical tube includes the casing and sets up the inside float of casing, its characterized in that still includes flow stability test part, flow stability test part includes:

the light signal transmitter, the light signal receiver and the image recognizer are arranged on two opposite sides of the conical tube, wherein the light signal transmitter, the light signal receiver and the conical tube are arranged in the vertical direction;

the optical signal emitter is used for emitting an optical signal, penetrating through one side wall of the conical tube, then being partially shielded by the floater, continuously penetrating through the other side wall of the conical tube, and then being projected to the optical signal receiver, wherein the optical signal forms a shadow spot on the optical signal receiver, the optical signal emitter is an emitter emitting a point light source optical signal, and the shadow spot is a shadow spot formed on the optical signal receiver after the optical signal is shielded by the floater;

the optical signal receiver is used for receiving the shadow spots, wherein the shadow spots can fluctuate up and down on the optical signal receiver along with the flow of the fluid;

and the image recognizer is used for recognizing the vertical position quantity of the shadow spots and analyzing and processing the vertical displacement quantity.

2. The wide-range flow stability testing device of claim 1, further comprising a display device, wherein analyzing the vertical displacement comprises outputting the vertical displacement through the display device.

3. The wide-range flow stability testing device of claim 1, wherein the optical signal emitter is further configured with an optical signal emitter drive assembly, the optical signal emitter drive assembly comprising: the mounting table is connected to the screw rod, the servo motor is connected with the screw rod, the servo motor drives the mounting table to move up and down through the screw rod, and the optical signal emitter is mounted on the mounting table and moves up and down together with the mounting table.

4. The wide-range flow stability testing device of claim 1, wherein the optical signal receiver is further configured with an optical signal receiver driver assembly, the optical signal receiver driver assembly comprising: adjust pole mount, adjust pole, installing support, adjust the pole with installing support and adjust pole mount threaded connection, it can be used to adjust the installing support is close to or keeps away from the bell pipe, light signal receiver install in on the installing support, and along with the installing support is close to together or keeps away from the bell pipe.

Technical Field

The invention relates to the technical field of fluid flow measurement, in particular to a wide-range flow stability testing device capable of accurately analyzing flow stability.

Background

1. The float flowmeter is used in general flow test application, and has the characteristics of simple structure, reliable work, wide application range, accurate measurement, convenient installation and the like. The float flowmeter is composed of a tapered tube which is gradually enlarged from bottom to top and a float which is arranged in the tapered tube and can freely move up and down along the central line of the tube, when a measured fluid flows in from the lower end of the tapered tube, the gravity of the float gradually tends to balance with the sum of the dynamic pressure of the fluid on the float and the buoyancy of the float in the fluid, and the float is stable at a certain position. The position of the floater in the conical pipe is in one-to-one correspondence with the flow of the fluid flowing through the conical pipe, so that the flow value of the measured fluid is measured.

2. In order to display the flow conveniently, the float flowmeter on the market at present is internally provided with magnetic steel in a float and an indicator, and when the float internally provided with the magnetic steel moves up and down along with the measured fluid, the magnetic steel in the indicator can be driven to rotate, so that the flow value on an instrument panel is indicated. In the method, the built-in magnetic steel of the indicator can generate a magnetic coupling force on the built-in magnetic steel of the floater, so that friction force exists between the floater and the guide rod, the free movement of the floater is limited, and the flow indicated by the indicator is inaccurate. If there is ferromagnetic object in the space around the float flowmeter, it will seriously affect the measurement accuracy of the measured fluid flow.

3. Due to environmental interference, improper installation, fluid characteristics and other influencing factors, the flow output signal of the measured fluid also fluctuates to a certain degree, so that the measurement indication value is unstable, and measurement errors are caused.

4. When the flow is unstable, the floater floats up and down, and the stability (fluctuation) of the flow cannot be accurately analyzed due to the fact that the floater volume is small and the floating amplitude is limited and is difficult to identify by naked eyes.

Therefore, a wide-range flow stability testing device capable of accurately analyzing the flow stability is needed.

Disclosure of Invention

The invention aims to provide a wide-range flow stability testing device capable of accurately analyzing flow stability.

In order to achieve the purpose, the technical scheme provided by the invention is as follows: there is provided a wide range flow stability test apparatus for monitoring flow stability of a fluid flowing through a pipeline, comprising: the conical tube, the conical tube includes the casing and sets up the inside float of casing still includes flow stability test part, flow stability test part includes:

the light signal transmitter, the light signal receiver and the image recognizer are arranged on two opposite sides of the conical tube, wherein the light signal transmitter, the light signal receiver and the conical tube are arranged in the vertical direction;

the optical signal transmitter is used for emitting an optical signal, penetrating through one side wall of the conical tube, being partially shielded by the floater, continuously penetrating through the other side wall of the conical tube and then projecting to the optical signal receiver, and the optical signal forms a shadow spot on the optical signal receiver, wherein the optical signal transmitter is a transmitter emitting a point light source optical signal, and the shadow spot is a shadow spot formed on the optical signal receiver after the optical signal is shielded by the floater;

the optical signal receiver is used for receiving the shadow spots, wherein the shadow spots can fluctuate up and down on the optical signal receiver along with the flow of the fluid;

and the image recognizer is used for recognizing the vertical position quantity of the shadow spots and analyzing and processing the vertical displacement quantity. The device further comprises a display device, and the analysis processing of the vertical displacement comprises the output of the vertical displacement through the display device. The optical signal transmitter is further configured with an optical signal transmitter drive assembly, the optical signal transmitter drive assembly comprising: servo motor, screw rod and mount table, the mount table connect in on the screw rod, servo motor with the screw rod is connected, servo motor passes through the screw rod is in order to drive the mount table reciprocates, light signal transmitter install in on the mount table, and along the mount table reciprocates together.

The optical signal receiver is further configured with an optical signal receiver driving assembly, the optical signal receiver driving assembly comprising: the adjusting rod is in threaded connection with the mounting support and the adjusting rod fixing support, the adjusting rod can be used for adjusting the mounting support to be close to or far away from the conical tube, and the optical signal receiver is mounted on the mounting support and is close to or far away from the conical tube along with the mounting support.

Compared with the prior art, the wide-range flow stability testing device has the following beneficial effects:

the invention uses the speckle identification technology to carry out continuous measurement, so that the light source and the floater are positioned at the same horizontal position, the floater can block the light emitted by the light source, the central position of the speckle formed on the optical signal receiver can be regarded as the vertical displacement of the floater, the vertical displacement is identified and analyzed by the image identifier, the corresponding flow value can be displayed in real time by the display device, the sensitivity is high, the operation is reliable, and the external flow value can be stored by the memory.

The invention uses the error compensation control system to correct the error in the measurement, and improves the total precision level of the float flowmeter.

The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the invention.

Drawings

Fig. 1 is a schematic diagram of an embodiment of a wide-range flow stability testing device according to the present invention.

Fig. 2 shows a geometrical view of the projection path of the present invention.

Fig. 3a shows another geometrical view of the projection beam path of the present invention.

Fig. 3b shows yet another geometric view of the projection beam path of the present invention.

Detailed Description

Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements throughout. As described above, as shown in fig. 1, the present invention provides a wide-range flow stability testing apparatus for monitoring the flow stability of a fluid flowing through a pipeline, wherein the flowmeter includes: a conical tube 16, a float 15 inside the conical tube 16, further comprising a flow stability test component comprising:

the light signal emitter 14, the light signal receiver 6 and the image recognizer 17 are arranged on two opposite sides of the conical tube 16, wherein the light signal emitter 14, the light signal receiver 6 and the conical tube 16 are arranged in the vertical direction;

it should be noted that the present invention is researched and designed based on the measurement principle of the conventional float flowmeter, and therefore, the structure of the tapered tube 16 is the same as that of the tapered tube of the conventional float flowmeter, and the tapered tube 16 needs to be vertically arranged to ensure the accuracy of the fluid flow measurement. And light signal transmitter 14 and light signal receiver 6 all are the vertical direction setting, and in this embodiment, light signal transmitter 14 can reciprocate in the vertical direction.

Referring to fig. 1, the optical signal transmitter 14 is configured to emit an optical signal, penetrate through one sidewall of the tapered tube 16, and then be partially shielded by the float 15, and continue to pass through the other sidewall of the tapered tube 16 and then be projected to the optical signal receiver 6, where the optical signal forms a shadow spot on the optical signal receiver 6, it is conceivable that the overall shape of the tapered tube 16 is a cylinder, the shadow spot formed on the optical signal receiver 6 is an approximately elliptical shape, and the optical signal receiver 6 may be a piece of curtain, and the shadow spot is imaged on the curtain. Wherein the optical signal transmitter 14 is a transmitter that emits an optical signal of a point light source, and the shadow spot is a shadow spot formed on the optical signal receiver 6 after the optical signal is partially blocked by the float 15;

referring to fig. 1, the image recognizer is configured to recognize a vertical position amount of the shadow spot, and analyze and process the vertical displacement amount; it will be understood that when a nearly point light source is illuminated on a circular float, a light spot with a shadow spot in the middle is formed on the optical signal receiver 6.

Referring to fig. 1, the image recognizer is configured to recognize a vertical position amount of the shadow spot and analyze and process the vertical displacement amount. The invention represents the stability of the fluid flow only by researching the vertical displacement of the shadow spot on the optical signal receiver 6 in the vertical direction, namely the vertical displacement of the shadow spot on the optical signal receiver 6.

In this embodiment, the image identifier includes a camera, preferably a wide-angle camera 17, and the wide-angle camera 17 may be a general wide-angle camera or a micro wide-angle camera. As shown in fig. 1, the wide-angle camera 17 is mounted on the mounting bracket 6A, is located at the rear side of the optical signal receiver 6, and is capable of detecting a shadow spot from the rear side of the optical signal receiver 6, the shadow spot is formed by imaging on the optical signal receiver 6 after the optical signal emitted by the optical signal emitter 14 is partially blocked by the float 15, the change in the flow velocity of the fluid causes the float 15 to fluctuate up and down, and therefore the shadow spot also fluctuates up and down along with the optical signal receiver 6, and the fluctuation amplitude of the shadow spot is referred to as a vertical displacement.

Referring to fig. 1, a display device 12 is further included, and analyzing the vertical displacement includes outputting the vertical displacement through the display device 12. The optical signal transmitter 14 is further configured with an optical signal transmitter drive assembly comprising: the optical signal transmitter comprises a servo motor 10, a screw rod 13 and a mounting table (not shown in the figure), wherein the mounting table is connected to the screw rod 13, the servo motor 10 is connected with the screw rod 13, the servo motor 10 drives the mounting table to move up and down through the screw rod 13, and the optical signal transmitter 14 is mounted on the mounting table and moves up and down along with the mounting table. If the fluctuation of the float 15 is not large, i.e., if the fluctuation is kept small at the position of the center line of the float 15, the optical signal transmitter driving unit is not required to participate in the operation, and if the fluctuation of the float 15 is larger than a set value, the optical signal transmitter driving unit is required to move to follow the float 15 so that the optical signal transmitter 14 is located at the position of the center line of the float 15.

Referring to fig. 1, the optical signal receiver 6 is further configured with an optical signal receiver driving assembly, which includes: adjust pole mount 5, adjust pole 4, installing support 6A, adjust pole 4 with installing support 6A and adjust pole mount 5 threaded connection, it can be used to adjust pole 4 the installing support 6A is close to or keeps away from conical tube 16, light signal receiver 6 install in on the installing support 6A, and along with installing support 6A is close to together or keeps away from conical tube 16. The mounting bracket 6A is a rectangular frame, one surface facing the conical tube 16 is a rectangular surface for mounting a rectangular curtain, and the rectangular curtain is mounted on the rectangular frame and faces the conical tube 16. The purpose of the mounting bracket 6A to be closer to or farther from the tapered tube 16 will be explained below.

The implementation principle of the invention is explained in detail below with reference to fig. 1, 2, 3a, 3 b: before explaining the principles of the present invention, the following technical terms that will appear below are explained first:

1.y₀is the theoretical center value of the shadow spot (i.e. the geometric center of the shadow spot in fig. 3 a), i.e. the corresponding flow indication, wherein the flow indication is a technical term well known in the industry;

2.y₃the extreme value of the shadow spot;

3.y₄the extreme left value or the extreme right value of the shadow spots;

4.y₅the geometric center value of the shadow spots is taken;

5.y₆the upper value of the shadow spots;

in the technical terms above: the extreme values are: the y value of the y coordinate corresponding to the lowest end of the shadow spot is obtained; extreme left or right values: the y value of the y coordinate corresponding to the leftmost end or the rightmost end of the shadow spot, the pole top value: the y value of the y coordinate corresponding to the uppermost end of the shadow spot;

the principle of the invention is as follows:

1. the float flowmeter is vertically installed in the pipeline through flange connection, if the gyro vertical instrument 2 indicates that the verticality has deviation, the relative position of the spherical base 9 and the lower connecting flange 7 can be adjusted until the gyro vertical instrument indicates that the float flowmeter is vertically installed in the pipeline. According to the measurement principle of the float flowmeter, if the float flowmeter is required to perform measurement with high accuracy, the float flowmeter needs to be vertically mounted.

2. When the measured fluid passes through the float flowmeter, the float 15 moves up and down along with the flow, and when the gravity of the float is equal to the resultant force of the dynamic pressure of the fluid on the float and the buoyancy of the float in the fluid, the float is stabilized at a certain height. The optical signal receiver 6 receives the displacement change of the 'projection' image generated by the floater in the flow change process, the 'projection' image is shot by the wide-angle camera 17 to carry out AI image processing, the corresponding relation between the height of the floater in the conical tube and the passing flow is calculated, the height of the floater is the measurement of the flow, and the flow value of the measured fluid is displayed by the flow display 12.

3. Referring to fig. 2, when measuring the flow stability, the shadow spots float up and down, the relative displacement difference value of the floating shadow spots can be regarded as the fluctuation of the flow, and the distance d1 between the optical signal receiver 6 and the float 15 can be adjusted by the optical signal receiver driving assembly (the adjusting rod 4, the adjusting rod fixing frame 5 and the optical signal receiver 6) to change the measurement accuracy, under a certain condition, when the value d1 is larger, the height H of the shadow spots is larger, the up-down relative displacement during the fluctuation is larger, and the measurement accuracy is higher. The flow stability (y) of the flow fluctuation can be calculated_0max-y_0min)/(2*y₀) 100%. Therefore, the effect of the mounting bracket 6A being closer to or farther from the tapered tube 16 is explained here.

4. Method of making the optical signal transmitter 14 level with the float 15: when the float 15 rises to a certain height, the optical signal transmitter 14 is arranged between the float 15 and the optical signal transmitter 14The line position is substantially at the same level, as shown in fig. 2, where the theoretical height H-y of the shadow spot₂-y₁＝2*(y₀-y₁) 2 tan θ (d1+ d2), and the means for controlling the level of the light emitter 14 and the float 15 is the servo motor 10, the control system makes a decision: if the measured value of the shadow spot height: h1 does not accord with 95% H not more than H1 not more than 105% H, the servo motor 10 controls the optical signal emitter 14 to move up and down until the measured value H1 accords with 95% H not more than H1 not more than 105% H, at this moment, the servo motor 10 stops running (note: 95% and 105% are motor control coefficients, the coefficients can be established according to the actual situation, when the theoretical 100%, the floater and the light source are closest to the horizontal, and the precision is highest at this moment).

5. Error correction of the actually measured shading value H1: the error of the light signal emitter 14 and the floater 15 when not at the same level can make the y0 value be the central value of the shadow spot, namely the height value of the floater 15 and the corresponding flow indicating value, and the system sets the motor control coefficientNamely, R is more than or equal to 95 percent and less than or equal to 105 percent;

a) referring to fig. 3a and 3b, when y5 is equal to y4, that isWhen the floater is in a horizontal position, the horizontal position of the optical signal emitter 14 is the same as the horizontal position of the floater without error;

b) referring to FIG. 3b, when y5 > y4When the temperature of the water is higher than the set temperature,

the horizontal position of the optical signal transmitter 14 is lower than the float flow indicating error, measured value H1-theoretical value: h ═ y₆-y₃)-(y₂-y₁)＝R％*(y₂-y₁)-(y₂-y₁)＝(R％-1)*2tanθ*(d₁+d₂)

c) When y5 < y4, the method is usedThe image principle is the same as in fig. 3b, the optical signal transmitter 14 is above the float, and the flow indication error is the theoretical value H-the measured value H (y)₂-y₁)-(y₆-y₃)＝(y₂-y₁)-R％*(y₂-y₁)＝(1-R％)*2tanθ*(d₁+d₂)

It should be noted that: the error correction generated by the conical tube light refraction can be realized by collecting the coefficient ratio equivalent value of the displacement value of the shadow spot, the real value and the theoretical value to perform data fitting, an error correction curve is made, and the tiny error can be regarded as a system error under a certain condition and is within a technically acceptable range.

The formula: 1. angle of light beam tangent float"projected" height theoretical H ═ 2 × (y0-y1) ═ 2 × (tan θ) (d1+ d2)3 flow stability ═ y_0max-y_0min)/(2*y₀)*100％

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.