CN110686735A - Self-diagnosis, self-calibration, self-correction Bitoba smart flowmeter - Google Patents

Abstract

The self-diagnosis, self-calibration, and self-correction Pitoba intelligent flowmeter of the present invention includes a Pitoba flow sensor, a differential pressure transmitter and a flow totalizer. The Pitoba flow sensor includes a static pressure guiding tube and A plurality of full-pressure guide pipes, the number of differential pressure transmitters is multiple, and also includes a sensor mounting seat. The positive pressure end of the transmitter is connected to each other. The full pressure hole of each full pressure guiding tube is located under the mounting sleeve at the bottom of the sensor mounting seat and is arranged in a vertical direction. The pressure guiding on the static pressure interface of the static pressure guiding tube The pipes are respectively connected with the negative pressure ends of the plurality of differential pressure transmitters through a plurality of branch pressure guiding pipes, and the signal output ends of the plurality of differential pressure transmitters are respectively connected with the corresponding signal input ends of the flow totalizer. The present invention is equivalent to using a plurality of different Pitoba flow meters to measure the fluid flow in the same pipeline, and the measurement result is relatively accurate.

Description

Self-diagnosis, self-calibration, self-correction Bitoba smart flowmeter

technical field

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

Background technique

At present, there are many types of flow measuring devices for measuring the fluid flow in the pipeline. The Pitoba flowmeter is widely used to measure the flow of the fluid in the pipeline due to its simple structure, convenient installation and relatively high measurement accuracy. Pitoba flowmeter is mainly composed of Pitoba flow sensor, differential pressure transmitter and flow totalizer. When using, the Pitoba flow sensor is inserted vertically into the pipeline from the side wall of the pipeline. The full pressure hole of the pressure head is facing the inflow direction of the fluid, and the static pressure hole is facing the outflow direction of the fluid. When the fluid flows in the pipeline, the full pressure interface and static pressure at the upper end of the pressure guiding pipe of the Bitopa flow sensor The interface outputs the total pressure and static pressure signals of the fluid flowing in the pipeline respectively. The differential pressure transmitter converts the total pressure and static pressure signals of the fluid in the pipeline transmitted by the Bitopa flow sensor into a standard current signal of 4~20mA and then transmits it. For the flow totalizer, according to the total pressure and static pressure of the fluid flowing in the pipeline, the flow rate of the fluid in the pipeline can be finally calculated in the flow totalizer according to the principle of fluid mechanics.

When the Bitopa flowmeter in the above-mentioned prior art measures the fluid flow in the pipeline, the static pressure signal derived from the static pressure guiding tube in the Bitoba flow sensor is usually relatively stable, and the measurement accuracy is mainly determined by the total pressure guiding. It is determined by the accuracy of the full pressure signal derived from the pressure tube. There are many reasons for the inaccuracy of the full pressure signal. For example, when the full pressure hole has scaling on the inner wall of the hole, excessive dust accumulation and crystallization, the output full pressure signal changes greatly, which will lead to a large measurement accuracy error.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a self-diagnosing, self-calibrating and self-correcting Pitoba intelligent flowmeter that can obtain relatively accurate measurement results when measuring the fluid flow in the pipeline.

In order to solve the above technical problems, the self-diagnosis, self-calibration, and self-correction Bitoba intelligent flowmeter of the present invention includes a Bitoba flow sensor, a differential pressure transmitter and a flow totalizer, and the Bitoba flow sensor includes a static pressure The pressure guiding tube and the full pressure guiding tube, the static pressure guiding tube has a static pressure hole at the bottom and a static pressure interface at the top, and the full pressure guiding tube has a full pressure hole at the bottom and a full pressure interface at the top. The static pressure interface of the pipe is connected to the negative pressure end of the differential pressure transmitter through the pressure guide pipe, and the full pressure interface of the full pressure pressure guide pipe is connected to the positive pressure end of the differential pressure transmitter through the pressure guide pipe. The signal output end of the device is connected with the signal input end of the flow totalizer, and also includes a sensor mounting seat, the sensor mounting seat has upper and lower connecting flanges that are fixedly connected, and a mounting sleeve is connected to the bottom of the lower connecting flange Said full-pressure pressure-guiding pipe and static pressure-guiding pipe are both sealed through the upper connecting flange, the number of said full-pressure pressure-guiding pipe is multiple, and correspondingly the number of said differential pressure transmitters is also There are more than one, each full-pressure pressure pipe is connected with the positive pressure end of the corresponding differential pressure transmitter through its full-pressure interface respectively through the pressure-guiding pipe, and the full-pressure hole of each full-pressure pressure pipe is All are located below the installation sleeve, the axes of these full-pressure pressure pipes are parallel to each other and in the same plane, and the full-pressure holes at the bottom of these full-pressure pressure pipes are gradually arranged in the vertical direction; the static pressure pipes The number of the static pressure guide pipe is 1, and the pressure guide pipe on the static pressure interface of the static pressure guide pipe is respectively connected with the negative pressure ends of the multiple differential pressure transmitters through a plurality of branch pressure guide pipes; the multiple differential pressure The signal output ends of the transmitter are respectively connected with the corresponding signal input ends of the flow totalizer.

As an improvement of the present invention, the static pressure hole at the bottom of the static pressure guide pipe is located in the installation sleeve.

As a further improvement of the present invention, the static pressure hole at the bottom of the static pressure guiding pipe is located at the bottom of the upper connecting flange.

Adopting the self-diagnosis, self-calibration and self-correction Pitoba intelligent flowmeter of the above structure, when in use, the Pitoba flow sensor of the present invention is installed on the measured pipeline through the matching of the installation sleeve at the bottom of the sensor mounting base with the measured pipeline. On the pipeline, the full-pressure holes at the bottom of the full-pressure impulse pipe are all located in the pipeline to be measured. Since the full-pressure holes at the bottom of multiple full-pressure impulse pipes are arranged gradually in the vertical direction, this is equivalent to using multiple different Pitoba flowmeters to measure the fluid flow in the same pipe, and the measurement results are the average of all the measurement results. value, the measurement results are relatively accurate, and the measurement accuracy is high; when a set of differential pressure signals output by a full-pressure pressure guiding tube and the static pressure guiding tube are transmitted to the said differential pressure transmitter through the corresponding differential pressure transmitter When the difference between the flow value accumulated by the flow totalizer and the average value of all measurement results exceeds a certain range, the totalizer can output the average value of other measurement results, and still obtain relatively accurate measurement results. In the present invention, the static pressure hole at the bottom of the static pressure guide pipe is located in the installation sleeve, and the static pressure output signal is relatively stable. Preferably, the static pressure hole at the bottom of the static pressure guide pipe is located at the bottom of the upper connecting flange. In the present invention, the full-pressure pressure guiding tube with a large error in the output measurement result can be repaired or replaced during the maintenance of the flowmeter.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is the main sectional structure diagram of the self-diagnosis, self-calibration and self-correction Pitoba intelligent flowmeter of the present invention.

Fig. 2 is a schematic main sectional structure diagram of a Pitoba flow sensor according to an embodiment of the present invention, in which the static pressure hole at the bottom of the static pressure guide pipe is located at the bottom of the upper connecting flange.

Fig. 3 is a schematic main cross-sectional structure diagram of a Pitoba flow sensor according to another embodiment of the present invention, in which the static pressure hole at the bottom of the static pressure guide pipe is located in the installation sleeve.

Detailed ways

1-3, the self-diagnosis, self-calibration, and self-correction Pitoba intelligent flowmeter of the present invention includes a Pitoba flow sensor 100, a differential pressure transmitter 200 and a flow totalizer 300, and the Pitoba flow The sensor 100 includes a static pressure guiding tube 110 and a full pressure guiding tube 120. The static pressure guiding tube 110 has a static pressure hole 111 at the bottom, a static pressure interface 112 at the top, and a full pressure hole at the bottom of the full pressure guiding tube 120. 121. The top has a full pressure interface 122. The static pressure interface 112 of the static pressure guide pipe 110 is connected to the negative pressure end of the differential pressure transmitter 200 through the pressure guide pipe 130, and the full pressure interface 122 of the full pressure guide pipe 120 is connected to the negative pressure end of the differential pressure transmitter 200 through the pressure guide pipe 130. The pressure pipe 130 is connected to the positive pressure end of the differential pressure transmitter 200, the signal output end of the differential pressure transmitter 200 is connected to the signal input end of the flow totalizer 300, and also includes a sensor mount 140, the sensor The mounting seat has upper and lower connecting flanges 141 and 142 that are fixedly connected, the bottom of the lower connecting flange 142 is connected with a mounting sleeve 143, and the full-pressure pressure guiding tube 120 and the static pressure guiding tube 110 are sealed through The upper connecting flange 141 is characterized in that: the number of the full-pressure pressure guiding pipes 120 is plural, and correspondingly the number of the differential pressure transmitters 200 is also plural, and each full-pressure guiding pipe is The full pressure interface 122 is respectively connected to the positive pressure end of the corresponding differential pressure transmitter 200 through the pressure guiding pipe 130 , and the full pressure hole 121 of each full pressure guiding pipe 120 is located below the installation sleeve 143 , the axes h ₁ of these full-pressure pressure guiding tubes 120 are parallel to each other and are located in the same plane, and the full-pressure holes 121 at the bottom of these full-pressure guiding tubes 120 are arranged gradually along the vertical direction, that is, the bottom of these full-pressure guiding tubes 120 The full-pressure holes 121 are arranged in the vertical direction, and the distances between adjacent full-pressure holes are equal; The pressure guiding pipes 130 are connected to the negative pressure ends of the plurality of differential pressure transmitters through a plurality of branch pressure guiding pipes 131 respectively; the signal output ends of the plurality of differential pressure transmitters 200 are respectively connected with the flow product The corresponding signal input terminals of the calculator 300 are connected. The static pressure hole 111 at the bottom of the static pressure guide pipe 110 is located in the installation sleeve 143 , preferably, the static pressure hole 111 at the bottom of the static pressure guide pipe 110 is located at the bottom of the upper connecting flange 141 .

Figure 1 also shows the structural state of the self-diagnosis, self-calibration, and self-correction Pitoba intelligent flowmeter of the present invention when it is installed on the pipeline 1 to be measured. In Figure 1, the Pitoba flow sensor is connected under its mounting seat. The installation sleeve 143 at the bottom of the flange is matched with the pipeline and installed on the pipeline 1 to be measured.

In the present invention, the differential pressure between the positive pressure passages and the negative pressure passages is different due to the different proportions of the insertion depths in the pipes. When there is a medium flowing, the positive pressure passages and the negative pressure passages are different due to the difference in the flow velocity at the center of the pipe and the flow velocity at the edge of the pipe. There is a certain proportion of the differential pressure between the pressure channels. When the scale in the pipeline is reduced, the inner diameter of the pipeline is reduced. At this time, the proportion of the sensor inserted in the pipeline changes, and the differential pressure between each positive pressure channel and negative pressure channel occurs in a certain proportion. The integrator calculates the scale of the pipe by recording the relationship between the proportional relationship of the differential pressure and the scale of the pipe, so as to calculate the flow area of the medium and automatically correct it.

Claims (3)

1. A self-diagnosing, self-calibrating and self-correcting Pitoba intelligent flowmeter, comprising a Pitoba flow sensor (100), a differential pressure transmitter (200) and a flow totalizer (300), the Pitoba flow The sensor (100) includes a static pressure guiding tube (110) and a full pressure guiding tube (120). The static pressure guiding tube (110) is provided with a static pressure hole (111) at the bottom and a static pressure interface (112) at the top. The full pressure guide tube (120) has a full pressure hole (121) at the bottom and a full pressure port (122) at the top. The static pressure port (112) of the static pressure guide tube (110) is connected to the The negative pressure end of the differential pressure transmitter (200) is connected, and the full pressure interface (122) of the full pressure guide pipe (120) is connected to the positive pressure end of the differential pressure transmitter (200) through the pressure guide pipe (130). , the signal output end of the differential pressure transmitter (200) is connected with the signal input end of the flow totalizer (300), and also includes a sensor mounting seat (140), the sensor mounting seat has fixedly connected upper and lower The connecting flanges (141, 142), the bottom of the lower connecting flange (142) is connected with a mounting sleeve (143), and the full-pressure pressure guiding pipe (120) and the static pressure guiding pipe (110) are both sealed and penetrated. The upper connecting flange (141) is characterized in that: the number of the full-pressure pressure guiding pipes (120) is multiple, and correspondingly, the number of the differential pressure transmitters (200) is also multiple, and each The full-pressure pressure guiding pipe is connected to the positive pressure end of the corresponding differential pressure transmitter (200) through the pressure guiding pipe (130) with its full-pressure interface (122), and each full-pressure guiding pipe ( The full-pressure holes (121) of 120) are all located below the installation sleeve (143), the axes of these full-pressure pressure pipes (120) are parallel to each other and are located in the same plane, and the bottoms of these full-pressure pressure pipes (120) The full pressure holes (121) are arranged gradually along the vertical direction; the number of the static pressure guide pipes (110) is one, and the static pressure guide pipes (110) are the pressure guide pipes on the static pressure interface (112). (130) are respectively connected to the negative pressure ends of the plurality of differential pressure transmitters through a plurality of branch pressure guiding pipes (131); the signal output ends of the plurality of differential pressure transmitters (200) are respectively connected to the plurality of differential pressure transmitters (200) The corresponding signal input ends of the flow totalizer (300) are connected. 2. The self-diagnosis, self-calibration, and self-correction Pitoba intelligent flowmeter according to claim 1, characterized in that: the static pressure hole (111) at the bottom of the static pressure guide pipe (110) is located in the installation sleeve (143). 3. The self-diagnosis, self-calibration, and self-correction Pitoba intelligent flowmeter according to claim 2, characterized in that: the static pressure hole (111) at the bottom of the static pressure guide pipe (110) is located in the upper connection method The bottom of the orchid (141).

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