阅读说明：本技术 一种自诊断、自校准、自修正毕托巴智能流量计 (Self-diagnosis, self-calibration and self-correction Pitotbar intelligent flowmeter ) 是由 王忠辉 唐力壮 王超 蔡潇 胡瑶 齐丽萍 孙丽民 张旭 于 2019-11-14 设计创作，主要内容包括：本发明的自诊断、自校准、自修正毕托巴智能流量计,包括毕托巴传感器、多个差压变送器和流量积算仪,毕托巴传感器包括多个静压导压管和全压导压管,还包括有传感器安装座,全压导压管和静压导压管均密封穿过传感器安装座的上连接法兰,多个全压导压管分别以其顶部的管口通过所述的导压管分别与相对应的差压变送器的正压端相连,每个全压导压管的全压孔均位于安装套筒的下方且沿竖直方向渐次排列；多个静压导压管分别以其顶部的管口通过所述的导压管分别与相对应的差压变送器的负压端相连,每个静压导压管的静压孔均位于安装套筒的下方且沿竖直方向渐次排列。本发明相当于使用多个不同的毕托巴流量计测量同一管道内的流体流量,测量结果相对准确。(The invention discloses a self-diagnosis, self-calibration and self-correction Pitot intelligent flowmeter, which comprises a Pitot sensor, a plurality of differential pressure transmitters and a flow integrating instrument, wherein the Pitot sensor comprises a plurality of static pressure guide pipes and full pressure guide pipes, and a sensor mounting seat, the full pressure guide pipes and the static pressure guide pipes are sealed and penetrate through an upper connecting flange of the sensor mounting seat, the full pressure guide pipes are respectively connected with positive pressure ends of the corresponding differential pressure transmitters through the pressure guide pipes by pipe orifices on the tops of the full pressure guide pipes, and full pressure holes of each full pressure guide pipe are positioned below a mounting sleeve and are arranged gradually along the vertical direction; the static pressure guide pipes are respectively connected with the negative pressure ends of the corresponding differential pressure transmitters through the pressure guide pipes by pipe openings at the tops of the static pressure guide pipes, and the static pressure holes of each static pressure guide pipe are located below the mounting sleeve and are arranged gradually along the vertical direction. The invention is equivalent to using a plurality of different Pitot-bar flow meters to measure the fluid flow in the same pipeline, and the measurement result is relatively accurate.)

1. A self-diagnosis, self-calibration and self-correction Pitot intelligent flowmeter comprises a Pitot sensor (100), a differential pressure transmitter (200) and a flow integrating instrument (300), wherein the Pitot sensor (100) comprises a static pressure pipe (110) and a full pressure pipe (120), the bottom of the static pressure pipe (110) is provided with a static pressure hole (111), the bottom of the full pressure pipe (120) is provided with a full pressure hole (121), a pipe orifice at the top of the static pressure pipe (110) is connected with a negative pressure end of the differential pressure transmitter (200) through the pressure pipe (130), a pipe orifice at the top of the full pressure pipe (120) is connected with a positive pressure end of the differential pressure transmitter (200) through the pressure pipe (130), a signal output end of the differential pressure transmitter (200) is connected with a signal input end of the flow integrating instrument (300), the Pitot sensor (100) further comprises a sensor mounting seat (140), this sensor mount pad has fixed upper and lower flange (141, 142) that link to each other, and even there is installation sleeve (143) bottom flange (142) down, full pressure pipe (120) and static pressure pipe (110) all sealed flange (141) of passing, its characterized in that: the number of the full-pressure guide pipes (120) is multiple, correspondingly, the number of the differential pressure transmitters (200) is also multiple, the multiple full-pressure guide pipes are respectively connected with positive pressure ends of the corresponding differential pressure transmitters (200) through the pressure guide pipes (130) by pipe openings at the tops of the multiple full-pressure guide pipes, full-pressure holes (121) of each full-pressure guide pipe (120) are located below the mounting sleeve (143), the axes of the full-pressure guide pipes (120) are parallel to each other and located in the same plane, and the full-pressure holes (121) at the bottoms of the full-pressure guide pipes (120) are gradually arranged along the vertical direction; correspondingly, the number of the static pressure guide pipes (110) is multiple, the static pressure guide pipes are respectively connected with the negative pressure end of the corresponding differential pressure transmitter (200) through the pressure guide pipes (130) by pipe openings at the tops of the static pressure guide pipes, the static pressure hole (111) of each static pressure guide pipe (110) is located below the mounting sleeve (143), the axes of the static pressure guide pipes (110) are parallel to each other and located in the same plane with the axis of the full pressure guide pipe (120), and the static pressure holes (111) at the bottoms of the static pressure guide pipes (110) are arranged gradually along the vertical direction.

Technical Field

The invention relates to a Pitotbar flowmeter, in particular to a self-diagnosis, self-calibration and self-correction Pitotbar intelligent flowmeter.

Background

The Pitot flowmeter mainly comprises a Pitot sensor, a differential pressure transmitter and a flow integrating instrument, when in use, the Pitot flow sensor is vertically inserted into a pipeline from the side wall of the pipeline, a full pressure hole of a pressure head of the Pitot flow sensor faces the incoming flow direction of the fluid, a static pressure hole faces the outgoing flow direction of the fluid, when the fluid flows in the pipeline, a full pressure interface and a static pressure interface at the upper end of a pressure guide pipe of the Pitot flow sensor respectively output full pressure and static pressure signals of the fluid flowing in the pipeline, the differential pressure transmitter converts the full pressure and static pressure signals of the fluid in the pipeline transmitted by the Pitot sensor into standard current signals of 4 ~ 20mA and transmits the standard current signals to the flow integrating instrument, and the flow of the fluid in the pipeline can be finally calculated according to the full pressure and static pressure of the fluid flowing in the flow integrating instrument.

When the pitot flowmeter in the prior art measures the fluid flow in a pipeline, the measurement accuracy of the pitot flow sensor determines the measurement accuracy of the fluid flow in the pipeline finally, and if the errors of signals of full pressure and static pressure transmitted by a full pressure and static pressure guide pipe are large, the error of a final measurement result is large. The full pressure or static pressure signal is inaccurate due to a plurality of reasons, for example, when scaling, excessive dust accumulation and crystallization occur on the inner wall of the hole of the full pressure or static pressure hole, the output full pressure or static pressure signal changes greatly, so that the error of the measurement result is large.

Disclosure of Invention

The invention aims to solve the technical problem of providing a self-diagnosis, self-calibration and self-correction Pitotbar intelligent flowmeter which can obtain relatively accurate measurement results when measuring the flow rate of fluid in a pipeline.

In order to solve the technical problem, the invention provides a self-diagnosis, self-calibration and self-correction Pitot intelligent flowmeter, which comprises a Pitot sensor, a differential pressure transmitter and a flow integrating instrument, wherein the Pitot sensor comprises a static pressure pipe and a full pressure pipe, the bottom of the static pressure pipe is provided with a static pressure hole, the bottom of the full pressure pipe is provided with a full pressure hole, a pipe orifice at the top of the static pressure pipe is connected with a negative pressure end of the differential pressure transmitter through the pressure pipe, a pipe orifice at the top of the full pressure pipe is connected with a positive pressure end of the differential pressure transmitter through the pressure pipe, a signal output end of the differential pressure transmitter is connected with a signal input end of the flow integrating instrument, the Pitot sensor also comprises a sensor mounting seat, the sensor mounting seat is provided with an upper connecting flange and a lower connecting flange which are fixedly connected, the bottom of the lower connecting flange is connected with a mounting sleeve, and the full pressure pipe and the static pressure pipe pass through, the number of the full-pressure guide pipes is multiple, correspondingly, the number of the differential pressure transmitters is also multiple, the multiple full-pressure guide pipes are respectively connected with the positive pressure ends of the corresponding differential pressure transmitters through the pressure guide pipes by pipe orifices on the tops of the multiple full-pressure guide pipes, the full-pressure hole of each full-pressure guide pipe is located below the mounting sleeve, the axes of the full-pressure guide pipes are mutually parallel and located in the same plane, and the full-pressure holes at the bottoms of the full-pressure guide pipes are arranged gradually along the vertical direction; correspondingly, the number of the static pressure guide pipes is also multiple, the static pressure guide pipes are respectively connected with the negative pressure ends of the corresponding differential pressure transmitters through the pressure guide pipes by pipe openings at the tops of the static pressure guide pipes, the static pressure holes of each static pressure guide pipe are located below the mounting sleeve, the axes of the static pressure guide pipes are parallel to each other and are located in the same plane with the axis of the full pressure guide pipe, and the static pressure holes at the bottoms of the static pressure guide pipes are arranged gradually along the vertical direction.

When the self-diagnosis, self-calibration and self-correction Pitot-bar intelligent flowmeter with the structure is used, the Pitot-bar flow sensor is arranged on a measured pipeline by matching the mounting sleeve at the bottom of the sensor mounting seat with the measured pipeline, and a full pressure hole at the bottom of a full pressure guide pipe and a static pressure hole at the bottom of a static pressure guide pipe are both positioned in the measured pipeline. Because the full-pressure holes at the bottoms of the full-pressure guide pipes and the static-pressure holes at the bottoms of the static-pressure guide pipes are arranged gradually along the vertical direction, the method is equivalent to measuring the flow of fluid in the same pipeline by using a plurality of different Pitot-bar flow meters, the measurement result is the average value of all the measurement results, the measurement result is relatively accurate, and the measurement precision is higher; when a group of differential pressure signals output by a certain full-pressure guide pipe and a corresponding static pressure guide pipe are transmitted to the flow integrating instrument through the corresponding differential pressure transmitter, and the difference value between the integrated flow value of the flow integrating instrument and the average value of all measurement results exceeds a certain range, the integrating instrument can output the average value of other measurement results, and still can obtain relatively accurate measurement results. According to the invention, a group of full-pressure guide pipes and static-pressure guide pipes with larger errors of output measurement results can be maintained or replaced during maintenance of the flowmeter.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic main cross-sectional view of a self-diagnosing, self-calibrating, self-correcting Pitotbar intelligent flow meter of the present invention.

FIGS. 2 and 3 are schematic views of the main cross-sectional structure of the Pitot-bar sensor of the present invention, wherein reference numerals are given to the full-pressure-guiding hole and the full-pressure-guiding hole in FIG. 2, and reference numerals are given to the sensor mounting seat, the axis of the full-pressure-guiding pipe and the axis of the static-pressure-guiding pipe in FIG. 3.

Detailed Description

Referring to fig. 1-3, the invention relates to a self-diagnosis, self-calibration, self-correction Pitotbar intelligent flowmeter, comprising a Pitotbar sensor 100, a differential pressure transmitter 200, a flow totalizer 300, a PitotbarThe sensor 100 comprises a static pressure pipe 110 and a full pressure pipe 120, the bottom of the static pressure pipe 110 is provided with a static pressure hole 111, the bottom of the full pressure pipe 120 is provided with a full pressure hole 121, the pipe orifice at the top of the static pressure pipe 110 is connected with the negative pressure end of a differential pressure transmitter 200 through a pressure pipe 130, the pipe orifice at the top of the full pressure pipe 120 is connected with the positive pressure end of the differential pressure transmitter 200 through a pressure pipe 130, the signal output end of the differential pressure transmitter 200 is connected with the signal input end of the flow integrating instrument 300, the pitot sensor 100 further comprises a sensor mounting seat 140, the sensor mounting seat is provided with an upper connecting flange 141 and a lower connecting flange 142 which are fixedly connected, the bottom of the lower connecting flange 142 is connected with a mounting sleeve 143, the full pressure pipe 120 and the static pressure pipe 110 are sealed and penetrate through the upper connecting flange 141, the number of the full pressure pipes 120 is multiple, correspondingly, the number of the differential pressure transmitters 200 is multiple, the full-pressure guide pipes are respectively connected with the positive pressure end of the corresponding differential pressure transmitter 200 through the pressure guide pipes 130 by pipe openings at the tops of the full-pressure guide pipes, the full-pressure hole 121 of each full-pressure guide pipe 120 is positioned below the mounting sleeve 143, and the axes h of the full-pressure guide pipes 120₁The full-pressure holes 121 at the bottoms of the full-pressure guide pipes 120 are arranged in a gradual manner along the vertical direction, that is, the full-pressure holes 121 at the bottoms of the full-pressure guide pipes 120 are arranged along the vertical direction, and the distances between the adjacent full-pressure holes are equal; correspondingly, the number of the static pressure guide pipes 110 is also multiple, the number of the static pressure guide pipes 110 is equal to the number of the full pressure guide pipes 120, the static pressure guide pipes are respectively connected with the negative pressure ends of the corresponding differential pressure transmitters 200 through the pressure guide pipes 130 by pipe openings at the tops, the static pressure hole 111 of each static pressure guide pipe 110 is positioned below the mounting sleeve 143, and the axes h of the static pressure guide pipes 110 are₂Parallel to each other and to the axis h of the full pressure pipe 120₁The static pressure holes 111 at the bottom of the static pressure guide pipes 110 are arranged in the same plane gradually along the vertical direction, that is, the static pressure holes 111 at the bottom of the static pressure guide pipes 110 are arranged along the vertical direction, and the distances between the adjacent static pressure holes are all equal.

Fig. 1 simultaneously shows the structural state of the self-diagnosis, self-calibration and self-correction Pitotbar intelligent flowmeter of the invention when being installed on a measured pipeline 1, and the Pitotbar sensor in fig. 1 is installed on the measured pipeline 1 by matching an installation sleeve 143 at the bottom of a connecting flange below an installation seat of the Pitotbar sensor with the pipeline.

In the invention, the differential pressure between each positive pressure passage and each negative pressure passage is different in proportion to the pipeline due to the fact that the insertion depth of the inserted pipeline is different in proportion to the pipeline, when a medium flows, the differential pressure between each positive pressure passage and the negative pressure passage has a certain proportion due to the fact that the central flow velocity of the pipeline is different from the edge flow velocity of the pipeline, when scaling in the pipeline is caused by the fact that the inner diameter of the pipeline is reduced, the proportion of a sensor inserted into the pipeline is changed, the differential pressure between each positive pressure passage and the negative pressure passage has a certain proportion to be changed, and the integrator calculates the scaling of the pipeline by recording the relation between the proportional. Thereby calculating the flow area of the medium and automatically correcting.