阅读说明：本技术 一种测量微小流量u型管差压式流量计、加注系统及方法 (Differential pressure type flowmeter, filling system and method for measuring micro-flow U-shaped pipe ) 是由 张春涛 王惠 赖海涛 陆梅 田发国 黄天虎 曾萍 于 2020-11-14 设计创作，主要内容包括：本发明属于微小流量测量技术领域,具体涉及一种测量微小流量U型管差压式流量计、加注系统及方法。本发明通过U型测量管、差压流量变送器、流体进口管和流体出口管组成测量微小流量U型管差压式流量计。通过测量微小流量U型管差压式流量计连接在介质储罐与外输泵之间组成微小流量加注系统。本发明通过将差压流量变送器高、低压侧取压通道同时设计成流体流动通道,利用U型管内径变小产生节流,实现了细小测量管不开孔情况下进行差压取压,解决了细小管径差压开孔取压难题,实现了用差压式流量计测量微小流量的效果。(The invention belongs to the technical field of micro flow measurement, and particularly relates to a differential pressure type flowmeter, a filling system and a method for measuring micro flow of a U-shaped pipe. The differential pressure type flowmeter for measuring the micro flow U-shaped pipe is composed of the U-shaped measuring pipe, the differential pressure flow transmitter, the fluid inlet pipe and the fluid outlet pipe. The micro-flow filling system is formed by connecting a differential pressure type flowmeter of a U-shaped pipe for measuring the micro-flow between a medium storage tank and an external delivery pump. According to the invention, the high-pressure side pressure taking channel and the low-pressure side pressure taking channel of the differential pressure flow transmitter are simultaneously designed into the fluid flow channel, and throttling is generated by using the reduction of the inner diameter of the U-shaped pipe, so that differential pressure taking is realized under the condition that the small measuring pipe is not provided with the hole, the problem of differential pressure tapping of the small pipe diameter is solved, and the effect of measuring the small flow by using the differential pressure flow meter is realized.)

1. The utility model provides a measure little flow U type pipe differential pressure formula flowmeter which characterized in that: the device comprises a U-shaped measuring pipe (1), a differential pressure flow transmitter (2), a fluid inlet pipe (4) and a fluid outlet pipe (5); the differential pressure flow transmitter (2) is provided with a high-pressure side pressure taking interface (6), a low-pressure side pressure taking interface (7), a high-pressure side discharge port (8) and a low-pressure side discharge port (9), the high-pressure side pressure taking interface (6) is communicated with the high-pressure side discharge port (8), and the low-pressure side pressure taking interface (7) is communicated with the low-pressure side discharge port (9); two ends of the U-shaped measuring pipe (1) are respectively communicated with a high-pressure side discharge port (8) and a low-pressure side discharge port (9) of the differential pressure flow transmitter (2); the fluid inlet pipe (4) is connected with a high-pressure side pressure taking interface (6) of the differential pressure flow transmitter (2), and the fluid outlet pipe (5) is connected with a low-pressure side pressure taking interface (7) of the differential pressure flow transmitter (2).

2. The differential pressure U-tube flowmeter for measuring a minute flow rate according to claim 1, wherein: the inner diameter of the U-shaped measuring pipe (1) is smaller than the inner diameters of the fluid inlet pipe (4) and the fluid outlet pipe (5).

3. The differential pressure flowmeter for measuring the micro-flow U-shaped pipe as claimed in claim 1, wherein: the differential pressure flow transmitter (2) comprises a differential pressure sensor and a flow calculation module, wherein the differential pressure sensor is in electric signal connection with the flow calculation module.

4. A differential pressure flowmeter for measuring a micro flow U-tube as claimed in claim 3, wherein: the differential pressure sensor adopts an EJA110E type differential pressure sensor.

5. A micro-flow filling system, at least comprising a medium storage tank (10) and an external delivery pump (3); the method is characterized in that: the differential pressure flowmeter for measuring the micro-flow U-shaped pipe is characterized by further comprising a differential pressure flowmeter for measuring the micro-flow U-shaped pipe according to any one of claims 1 to 4; the differential pressure type flowmeter for measuring the micro flow U-shaped pipe is connected between the medium storage tank (10) and the output pump (3).

6. A micro flow filling system as claimed in claim 5, wherein: the device also comprises a PLC controller; the PLC is respectively connected with an output pump (3) and a differential pressure flow transmitter (2) in the differential pressure type flowmeter for measuring the micro flow U-shaped pipe through electric signals.

7. A method of priming a micro-flow priming system according to any one of the claims 5 to 6, comprising the steps of,

the method comprises the following steps: setting a fluid temperature value in the flow transducer (2), and then controlling the start of the output pump (3) by the PLC;

step two: the differential pressure flow transmitter (2) acquires real-time differential pressure and static pressure values of a medium flowing through, and calculates the fluid flow through a flow calculation module in the differential pressure flow transmitter (2);

step three: the differential pressure flow transmitter (2) transmits the calculation result to the PLC; the PLC controller adjusts the output pump (3) according to the acquired data to perform fine filling of the micro liquid phase flow.

Technical Field

The invention belongs to the technical field of micro flow measurement, and particularly relates to a differential pressure type flowmeter, a filling system and a method for measuring micro flow of a U-shaped pipe.

Background

Accurate measurement of minute flows has been a difficult problem in the industry. Some gas fields adopt high-pressure gas collection and centralized alcohol injection processes, and wet natural gas extracted from a stratum is easy to form natural gas hydrate to block pipelines in winter due to high operation pressure of gas production pipelines, so a methanol injection process is arranged in a gas collection station, namely methanol is injected into the gas production pipelines through a high-pressure plunger pump, and freezing and blocking of the gas production pipelines are avoided. The maximum discharge capacity of a plunger pump adopted on site is 32L/h, and the actual injection discharge capacity needs to be frequently adjusted between 10 percent and 100 percent (namely 3L/h to 30L/h) of the maximum discharge capacity according to different conditions of air temperature change, gas well pressure and water production, so that reasonable filling is realized, and the consumption cost of methanol is reduced. However, the field displacement is estimated by the scale of the adjusting mechanism, and the error is large and is often more than 20%. To achieve fine fill, the micro liquid flow needs to be accurately metered.

Disclosure of Invention

The invention provides a differential pressure type flowmeter, a filling system and a differential pressure type method for measuring a micro-flow U-shaped pipe, and aims to provide a flowmeter capable of accurately measuring micro-liquid flow so as to realize fine filling.

In order to achieve the purpose, the invention adopts the technical scheme that:

a differential pressure type flowmeter of a U-shaped pipe for measuring micro flow comprises a U-shaped measuring pipe, a differential pressure flow transmitter, a fluid inlet pipe and a fluid outlet pipe; the differential pressure flow transmitter is provided with a high-pressure side pressure taking interface, a low-pressure side pressure taking interface, a high-pressure side discharge port and a low-pressure side discharge port, wherein the high-pressure side pressure taking interface is communicated with the high-pressure side discharge port, and the low-pressure side pressure taking interface is communicated with the low-pressure side discharge port; two ends of the U-shaped measuring pipe are respectively communicated with a high-pressure side discharge port and a low-pressure side discharge port of the differential pressure flow transmitter; the fluid inlet pipe is connected with a high-pressure side pressure taking and connecting port of the differential pressure flow transmitter, and the fluid outlet pipe is connected with a low-pressure side pressure taking and connecting port of the differential pressure flow transmitter.

The inner diameter of the U-shaped measuring pipe is smaller than the inner diameters of the fluid inlet pipe and the fluid outlet pipe.

The differential pressure flow transmitter comprises a differential pressure sensor and a flow calculation module, wherein the differential pressure sensor is in electric signal connection with the flow calculation module.

The differential pressure sensor adopts an EJA110E type differential pressure sensor.

A micro-flow filling system at least comprises a medium storage tank and an external delivery pump; the differential pressure flowmeter for measuring the micro-flow U-shaped pipe is characterized by further comprising a differential pressure flowmeter for measuring the micro-flow U-shaped pipe according to any one of claims 1 to 4; the differential pressure type flowmeter for measuring the micro flow U-shaped pipe is connected between the medium storage tank and the external delivery pump.

The device also comprises a PLC controller; the PLC is respectively connected with the output pump and a differential pressure flow transmitter in the differential pressure type flowmeter for measuring the micro flow U-shaped pipe through electric signals.

A filling method of a micro-flow filling system comprises the following steps,

the method comprises the following steps: setting a fluid temperature value for the flow transmitter, and then controlling the start of the output pump by the PLC;

step two: the differential pressure flow transmitter acquires real-time differential pressure and static pressure values of a medium flowing through, and calculates the fluid flow through a flow calculation module in the differential pressure flow transmitter;

step three: the differential pressure flow transmitter transmits the calculation result to the PLC; and the PLC adjusts the output pump according to the acquired data to perform fine filling of the micro liquid phase flow.

Has the advantages that:

the invention designs the pressure taking channel at the high and low pressure sides of the differential pressure flow transmitter into a fluid flow channel, realizes differential pressure taking under the condition that the tiny measuring tube is not perforated, solves the problem of differential pressure tapping of tiny tube diameter, and realizes the effect of measuring tiny flow by using the differential pressure flow meter.

The foregoing is a summary of the present invention, and the following is a detailed description of the preferred embodiments of the present invention in order to provide a more clear understanding of the technical features of the present invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

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

FIG. 2 is a schematic diagram of a differential pressure flow transmitter of the present invention;

fig. 3 is a schematic diagram of the field application of the present invention.

In the figure: 1-U-shaped measuring tube; 2-differential pressure flow transmitter; 3-an external delivery pump; 4-a fluid inlet pipe; 5-a fluid outlet pipe; 6-high pressure side pressure taking interface; 7-low pressure side pressure taking interface; 8-high pressure side vent; 9-low pressure side vent; 10-medium reservoir.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1 to 3, the differential pressure flowmeter of the U-shaped pipe for measuring micro flow comprises a U-shaped measuring pipe 1, a differential pressure flow transmitter 2, a fluid inlet pipe 4 and a fluid outlet pipe 5; the differential pressure flow transmitter 2 is provided with a high-pressure side pressure taking interface 6, a low-pressure side pressure taking interface 7, a high-pressure side discharge port 8 and a low-pressure side discharge port 9, the high-pressure side pressure taking interface 6 is communicated with the high-pressure side discharge port 8, and the low-pressure side pressure taking interface 7 is communicated with the low-pressure side discharge port 9; the two ends of the U-shaped measuring pipe 1 are respectively communicated with a high-pressure side discharge port 8 and a low-pressure side discharge port 9 of the differential pressure flow transmitter 2; the fluid inlet pipe 4 is connected with a high-pressure side pressure-taking interface 6 of the differential pressure flow transmitter 2, and the fluid outlet pipe 5 is connected with a low-pressure side pressure-taking interface 7 of the differential pressure flow transmitter 2.

When the invention is applied specifically, the differential pressure flow transmitter 2 measures the fluid differential pressure and static pressure at the inlet and the outlet of the U-shaped pipe in real time, the fluid temperature is set as a fixed value because of small change, and the flow meter calculator 3 calculates the fluid flow in real time according to the differential pressure, the static pressure and the temperature value by utilizing a calculation formula of a throttling flow meter in the prior art. When the flow is adjusted by adjusting the external delivery pump 3, the flow meter can display the flow change in real time, and fine filling of the micro liquid phase flow is realized.

The invention designs the high and low pressure side pressure taking channels of the differential pressure flow transmitter 2 into the fluid flow channel, realizes the differential pressure taking under the condition that the tiny measuring tube is not provided with the hole, solves the problem of the differential pressure taking of the tiny pipe diameter by the hole opening, and realizes the effect of measuring the tiny flow by the differential pressure flow meter.

Example two:

referring to fig. 1 and 2, in a differential pressure flowmeter of a U-shaped pipe for measuring a small flow rate, on the basis of the first embodiment, the inner diameter of the U-shaped measuring pipe 1 is smaller than the inner diameters of a fluid inlet pipe 4 and a fluid outlet pipe 5.

In practical use, the U-shaped measuring tube 1 adopts the technical scheme, and when fluid flows through the U-shaped measuring tube 1, differential pressure is generated in front of and behind the U-shaped measuring tube due to throttling effect; the fluid flow can be measured by utilizing the measurement principle of the throttling flowmeter, the pressure tapping of a small pipeline in the prior art is avoided, and the purpose of measuring the micro flow through the differential pressure flowmeter is realized.

Example three:

referring to fig. 1 and fig. 2, a differential pressure flowmeter for measuring a micro flow U-shaped pipe is based on the first embodiment: the differential pressure flow transmitter 2 comprises a differential pressure sensor and a flow calculation module, wherein the differential pressure sensor is in electric signal connection with the flow calculation module.

Further, the differential pressure sensor is an EJA110E type differential pressure sensor.

During actual use, differential pressure and static pressure signals are obtained through the differential pressure sensor, and the obtained differential pressure and static pressure signals are provided to the flow calculation module to obtain the fluid flow.

The differential pressure sensor adopts the technical scheme, and can simultaneously measure the front and back differential pressure and the static pressure of the U-shaped measuring tube 1.

The differential pressure sensor adopts an EJA110E type differential pressure sensor, compared with the prior art, 1 pressure sensor is reduced, the structure is simplified, and the subsequent tiny flow measurement value can be conveniently obtained.

The flow calculation module in the embodiment adopts the prior art, and the real-time calculation and display of the flow are conveniently realized.

Example four:

referring to fig. 3, a micro flow filling system is shown, comprising at least a medium reservoir 10 and an output pump 3; the differential pressure type flowmeter also comprises a differential pressure type flowmeter for measuring the micro flow U-shaped pipe; the differential pressure type flowmeter of the U-shaped pipe for measuring the micro flow is connected between the medium storage tank 10 and the outward conveying pump 3.

During actual use, the differential pressure type flowmeter of the U-shaped pipe for measuring the micro flow is arranged between the medium storage tank 10 and the output pump 3, liquid from the medium storage tank 10 passes through the differential pressure type flowmeter of the U-shaped pipe for measuring the micro flow, differential pressure is generated at the inlet and the outlet of the U-shaped measuring pipe 1, the differential pressure flow transmitter 2 measures differential pressure and static pressure signals in real time and transmits the signals to the flow calculation module, and the flow calculation module calculates the fluid flow in real time. When the flow is regulated by the output pump 3, the differential pressure type flowmeter for measuring the micro-flow U-shaped pipe can display the flow change in real time.

Example five:

referring to a micro-flow filling system shown in fig. 3, on the basis of the first embodiment: the device also comprises a PLC controller; the PLC is respectively connected with the output pump 3 and a flow meter calculator 3 in the differential pressure type flow meter of the U-shaped pipe for measuring the micro flow by electric signals.

In actual use, the PLC controller can realize automation of operation and the accuracy is improved.

Example six:

a filling method of a micro-flow filling system comprises the following steps,

the method comprises the following steps: setting a fluid temperature value in the flow transmitter 2, and then controlling the external delivery pump 3 to start by the PLC;

step two: the differential pressure flow transmitter 2 acquires real-time differential pressure and static pressure values of a medium flowing through, and calculates the fluid flow through a flow calculation module in the differential pressure flow transmitter 2;

step three: the differential pressure flow transmitter 2 transmits the calculation result to the PLC; and the PLC adjusts the output pump 3 according to the acquired data to perform fine filling of the micro liquid phase flow.

When the invention is actually used, because the temperature of the methanol is not changed greatly when the methanol is filled on site, the temperature value of the fluid is preset to be a fixed value and set in the flow transducer 2, and the flow of the fluid can be calculated according to the prior art.

The invention designs the pressure taking channel at the high and low pressure sides of the differential pressure flow transmitter into a fluid flow channel, realizes differential pressure taking under the condition that the tiny measuring tube is not perforated, solves the problem of differential pressure tapping of tiny tube diameter, and realizes the effect of measuring tiny flow by using the differential pressure flow meter.

Example seven:

the present invention will be explained in further detail below, taking the application of the invention in a certain gas field as an example, see fig. 3.

A differential pressure type flowmeter of a U-shaped pipe for measuring micro flow is arranged between a methanol tank and an output pump 3, liquid from the methanol tank passes through the differential pressure type flowmeter of the U-shaped pipe for measuring micro flow, differential pressure is generated at an inlet and an outlet of a U-shaped measuring pipe, a differential pressure transmitter 2 measures differential pressure and static pressure signals in real time, and a flow meter calculator 3 calculates the fluid flow in real time. When the flow is adjusted by the output pump, the flow meter can display the flow change in real time.

The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.