阅读说明：本技术 一种使用流量计制作节流孔板的方法 (Method for manufacturing orifice plate by using flowmeter ) 是由 郭承弘 王战国 于 2020-11-24 设计创作，主要内容包括：本发明涉及一种使用流量计制作节流孔板的方法,该方法包括：S1、调节阀门使得泵浦依照设定运行曲线运行；S2、在管道上选取A点和B点,A点和B点存在高度差；S3、在A处安装压力表测量A处的压力P-1,在A处安装流量计测量A处的流量Q-1,测量A处的高度h-1,在B处安装压力表测量B处的压力P-2,测量B处的高度h-2,根据伯努利方程以及Q＝VA计算出B处的流速v-2；S4、同一管道中流量相同,得到Q-1＝Q-2,得到v-1A-1＝v-2A-2,A-2为B处管道理论截面积,根据圆计算公式得到B处管道理论管径；S5、根据B处管道理论管径加工节流孔板孔径,将节流孔板安装在B处。通过本发明的方法可以较为精准的得到节流孔板的规格,便于加工,提升加工效率。(The invention relates to a method for manufacturing a throttling orifice plate by using a flowmeter, which comprises the following steps: s1, adjusting a valve to enable the pump to operate according to a set operation curve; s2, selecting a point A and a point B on the pipeline, wherein the point A and the point B have a height difference; s3, installing a pressure gauge at A to measure the pressure P at A 1 The flowmeter is arranged at A to measure the flow Q at A 1 Measuring at AHeight h 1 A pressure gauge is arranged at the position B to measure the pressure P at the position B 2 Measuring the height h at B 2 Calculating the flow velocity v at B according to Bernoulli's equation and Q ═ VA 2 (ii) a S4, obtaining Q with the same flow in the same pipeline 1 ＝Q 2 To obtain v 1 A 1 ＝v 2 A 2 ，A 2 Obtaining the theoretical pipe diameter of the pipeline at the position B according to a circle calculation formula, wherein the theoretical sectional area of the pipeline at the position B is the theoretical sectional area of the pipeline at the position B; and S5, processing the aperture of the orifice plate according to the theoretical pipe diameter of the pipeline at the position B, and installing the orifice plate at the position B. The method can accurately obtain the specification of the orifice plate, is convenient to process and improves the processing efficiency.)

1. A method of making an orifice plate using a flow meter, the method comprising:

s1, measuring the running current of the pump, adjusting a valve on a pipeline at the rear end of the pump, and determining that the pump runs according to a set running curve;

s2, determining a point B of the installation position of the orifice plate on the pipeline, and selecting a point A on the pipeline, wherein the point A and the point B are not at the same height position;

s3, installing a pressure gauge at A to measure the pressure P at A₁The flowmeter is arranged at A to measure the flow Q at A₁Measuring the height h at A₁A pressure gauge is arranged at the position B to measure the pressure P at the position B₂Measuring the height h at B₂The method comprises, in accordance with the Bernoulli equation,p is pressure, rho is fluid density, C is constant, and the calculation result isCalculating the flow velocity at A according to the conditions that Q is VA, Q is flow, V is flow velocity, A is the sectional area of the pipelineA₁The cross-sectional area of the pipeline at A is defined as v₁Substitution intov₂ ²In (1), calculating the flow velocity at B

S4, obtaining Q with the same flow in the same pipeline₁＝Q₂，Q₂For the flow at B, according to Q ═ VA, we obtain v₁A₁＝v₂A₂，A₂Obtaining the theoretical pipe diameter of the pipeline at the position B according to a circle calculation formula, wherein the theoretical sectional area of the pipeline at the position B is the theoretical sectional area of the pipeline at the position B;

and S5, processing the aperture of the orifice plate according to the theoretical pipe diameter of the pipeline at the position B, and installing the orifice plate at the position B.

2. The method of claim 1, wherein the step S1 further comprises measuring the flow rate Q in the pipe when the pump operates according to the operation curve₀(ii) a After the throttle orifice plate is installed, the valve is adjusted to the maximum degree, and the flow Q in the pipeline is measured₃Comparison of Q₃And Q₀If Q is₃＝Q₀And the throttle orifice plate is installed according to the requirements.

3. The method of claim 1, wherein point B is selected between the pump and the valve.

4. The method of claim 1, wherein the flow rate in the conduit is measured using an ultrasonic flow meter.

Technical Field

The invention relates to the field of ship mooring debugging, in particular to a method for manufacturing a throttling orifice plate by using a flowmeter.

Background

In the process of ship pumping mooring debugging, due to the influence of uncertain factors such as actual field pipeline arrangement and equipment performance, the phenomena that the discharge pressure, current, discharge capacity and other data of an oil pump and a water pump are not consistent with a rated value and the like are often encountered.

In field pump mooring debugging, the operation displacement of a pump is overlarge and needs to be adjusted by adjusting a valve at a pump outlet, but after the valve is adjusted, the valve can be touched by mistake, so that a throttling orifice plate needs to be additionally arranged on a pipeline to limit the discharge displacement of the pump, and the displacement cannot be further increased even if the valve is touched by mistake.

In the past, the size of the orifice plate is determined according to field experience, the size is difficult to accurately determine, and a reasonable result can be obtained only by repeated manufacturing and continuous pipeline dismounting tests. Such operation is time-consuming and is prone to cause a large amount of leakage of liquid in the pipeline.

Disclosure of Invention

In order to solve the technical problems, the invention provides a method for manufacturing a throttle orifice plate by using a flowmeter, which comprises the steps of calculating and calculating the aperture of a pump outlet throttle orifice plate after debugging is finished, accurately processing the throttle orifice plate, and avoiding other people from mistakenly touching a valve to further increase the pump discharge capacity by using the throttle orifice plate, wherein the technical purpose of the invention is realized by the following technical scheme:

a method of making an orifice plate using a flow meter, the method comprising:

s1, measuring the running current of the pump, adjusting a valve on a pipeline at the rear end of the pump, and determining that the pump runs according to a set running curve;

s2, determining a point B of the installation position of the orifice plate on the pipeline, and selecting a point A on the pipeline, wherein the point A and the point B are not at the same height position;

s3, installing a pressure gauge at A to measure the pressure P at A₁The flowmeter is arranged at A to measure the flow Q at A₁Measuring the height h at A₁A pressure gauge is arranged at the position B to measure the pressure P at the position B₂Measuring the height h at B₂The method comprises, in accordance with the Bernoulli equation, V²p is pressure, rho is fluid density, C is constant, and the calculation result is Calculating the flow velocity at A according to the conditions that Q is VA, Q is flow, V is flow velocity, A is the sectional area of the pipelineA₁The cross-sectional area of the pipeline at A is defined as v₁Substitution intoIn (1), calculating the flow velocity at B

S4, obtaining Q with the same flow in the same pipeline₁＝Q₂，Q₂For the flow at B, according to Q ═ VA, we obtain v₁A₁＝v₂A₂，A₂Obtaining the theoretical pipe diameter of the pipeline at the position B according to a circle calculation formula, wherein the theoretical sectional area of the pipeline at the position B is the theoretical sectional area of the pipeline at the position B;

and S5, processing the aperture of the orifice plate according to the theoretical pipe diameter of the pipeline at the position B, and installing the orifice plate at the position B.

Further, S1 includes a flow rate Q in the pipe when the pump operates according to the operation curve₀(ii) a After the throttle orifice plate is installed, the valve is adjusted to the maximum degree, and the pipeline is measuredInternal flow rate Q₃Comparison of Q₃And Q₀If Q is₃＝Q₀And the throttle orifice plate is installed according to the requirements.

Further, point B is chosen between the pump and the valve.

Further, the flow rate in the pipe is measured using an ultrasonic flow meter.

Compared with the prior art, the method has the advantages that the aperture size of the throttle orifice can be calculated through the method, the throttle orifice is accurately processed through the calculated aperture, the aperture of the throttle orifice is determined without multiple tests and gradual adjustment, and manufacturing efficiency is improved.

Drawings

FIG. 1 is a schematic view of the measurement construction of the present invention.

FIG. 2 is a schematic view of an orifice plate installation of the present invention.

FIG. 3 is a schematic view of an orifice plate structure in accordance with the present invention.

In the figure, 1, pumping; 2. a pipeline; 3. a valve; 4. a pressure gauge; 5. an ultrasonic flow meter; 6. A restriction orifice plate; 7. and (4) a flange joint.

Detailed Description

The technical solution of the present invention is further described below with reference to specific embodiments:

when the pump works, the motor converts electric energy into kinetic energy of liquid, and extra consumption such as motor bearing friction, winding heating, impeller wind resistance cooling at the tail part of the motor, pump bearing friction, friction between the impeller and the liquid during rotation and the like needs to be removed, and the extra consumption is generally expressed by operating efficiency Eta. The operation displacement and the lift can be determined during the design of the initial pipeline principle, and a pumping factory selects an optimal operation point according to an agreed operation curve of the pumping. The operating efficiency Eta is different at different positions of the operating curve.

The power calculation formula of the pump motor is as follows:

n KP KPe/η KP QH/3600 η 1000 η, where the symbols have the following meanings:

p: shaft power (KW) of the pump, power transmitted by the motor to the pump shaft;

pe: effective power (KW) of the pump, kinetic energy of the fluid taken from the pump per unit time;

ρ: density of pump delivery medium (KG/M3);

q: pump flow (M3/H);

h: a pump head (M);

ag: a gravitational acceleration constant of 9.8M/S2;

k: the efficiency coefficient of the motor is generally 1.1-1.3;

eta: the operating efficiency of the pump, i.e. the ratio of the effective power to the shaft power;

n: total power (KW) of the motor.

Based on the operating efficiency Eta/Pe, N KP KPe/η KP QH/3600 η is simplified to obtain N Eta QH/3600 η 1000.

The key indexes in the actual pumping debugging process are the discharge pressure and the current, the most common problems of field debugging are that the pressure is too small, the current exceeds the standard, the current, the flow, the lift and the like need to be adjusted, and the common adjustment direction is to reduce the current and improve the pressure. If an abnormality occurs due to factors other than pressure and current, this may indicate a problem with the pump itself or an insufficient pump inlet pressure.

A method of making an orifice plate using a flow meter, as shown in fig. 1-3, comprising the steps of:

s1, measuring the running current of the pump, adjusting a valve 3 on a pipeline 2 at the rear end of the pump 1, and determining that the pump runs according to a set running curve; the flow rate Q in the pipe at this time is measured by using an ultrasonic flow rate 5 meter₀And the flow value is an ideal pipeline state after the throttle orifice plate is additionally arranged.

Since the ultrasonic flow meter is susceptible to bubbles, the ultrasonic flow meter should be disposed in the straight pipe section and at a position away from the suction port of the pump and the valve outlet, which is not likely to generate bubbles.

S2, determining a point B of the installation position of the orifice plate on the pipeline 2, wherein the point B is located between the pump 1 and the valve 3, and selecting a point A on the pipeline, and the point A and the point B are not at the same height position, as shown in figure 1.

S3, according to bernoulli' S equation:p is the pressure of a certain point of the pipeline, rho is the density of the fluid, V is the velocity of the fluid, and C is a constant. When ideal fluid stably flows, the total pressure head (C) at any section of the pipeline is not changed, namely, under an ideal state, the energy of the fluid passing through any section of the pipeline is the same according to the law of energy conservation.

The pressure gauge 4 is arranged at A to measure the pressure P at A₁The flowmeter is arranged at A to measure the flow Q at A₁Measuring the height h at A₁A pressure gauge 4 is arranged at B for measuring the pressure P at B₂Measuring the height h at B₂The method comprises, in accordance with the Bernoulli equation,p is pressure, rho is fluid density, C is constant, and the calculation result is Calculating the flow velocity at A according to the conditions that Q is VA, Q is flow, V is flow velocity, A is the sectional area of the pipelineV is to be₁Substitution into In (1), calculating the flow velocity v at B₂，The sectional area a of the pipeline can be calculated according to the radius of the pipeline, taking the position a as an example, the radius of the pipeline at the position a is r, and the position a is pi r²。

S4, obtaining Q when the flow rates of all parts in the same pipeline are the same₁＝Q₂，Q₂For the flow at B, according to Q ═ VA, we obtain v₁A₁＝v₂A₂，A₁Is the cross-sectional area of the pipeline at A, A₂Obtaining the theoretical pipe diameter of the pipeline at the position B according to a circle calculation formula, wherein the calculation mode is the same as that of the pipeline at the position A;

s5, processing the aperture of the orifice plate according to the theoretical pipe diameter of the pipeline at the position B, installing the orifice plate 6 between two sections of pipelines 2 as shown in figure 2, welding flange joints 7 at the pipeline joints, and installing the orifice plate 6 between the flange joints 7.

After the installation is finished, the valve 3 is adjusted to the maximum degree after the installation of the measuring throttle orifice plate is finished, and the flow Q in the pipeline is measured₃Comparison of Q₃And Q₀If Q is₃＝Q₀And the throttle orifice plate is installed according to the requirements.

The present invention is further explained and not limited by the embodiments, and those skilled in the art can make various modifications as necessary after reading the present specification, but all the embodiments are protected by the patent law within the scope of the claims.