CN-121977741-A - Air pressure self-discharging type pressure measuring pipe orifice device and monitoring method thereof

CN121977741ACN 121977741 ACN121977741 ACN 121977741ACN-121977741-A

Abstract

The invention relates to the technical field of liquid pressure measurement, in particular to a precision optimization design in a liquid pressure measurement process. The invention aims to provide an air pressure self-discharging pressure measuring pipe orifice device and a monitoring method thereof, wherein a liquid phase pressure transmission passage and a self-discharging exhaust passage which are physically isolated are built in a pipe orifice piece, and the collection and the conditional discharge of air are automatically completed. Ensuring that the signal obtained by the pressure acquisition module reflects purely the liquid phase pressure. The authenticity and the reliability of the pressure data are improved, and the method is suitable for long-term and continuous automatic engineering monitoring scenes.

Inventors

MA YUHANG
LI BIN
KANG QINMING
LI ZONGCHUAN
WU ZHONGMING
ZHOU QIANG

Assignees

浙江华东测绘与工程安全技术有限公司
中国电建集团华东勘测设计研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260407

Claims (10)

1. The device is characterized by comprising a pipe orifice piece and a pressure acquisition module; the pipe orifice piece is arranged at the pipe orifice position of the pressure measuring pipe, a liquid phase pressure transmission passage and a self-venting passage which are mutually isolated are formed inside the pipe orifice piece, wherein, The liquid phase pressure transmission passage is used for guiding the pressure in the pressure measuring pipe to the pressure acquisition module through a liquid column; The self-venting exhaust passage is used for forming gas collection in the pipe orifice piece and venting the gas when preset conditions are met so as to reduce the influence of free gas in the liquid phase pressure transmission passage on pressure transmission; the pressure acquisition module is arranged at the pipe orifice part and communicated with the liquid phase pressure transmission passage and is used for acquiring pressure signals transmitted by the liquid phase pressure transmission passage.
2. The pressure measuring pipe orifice device of claim 1, wherein the orifice member comprises a pressure self-venting module housing (50) and an orifice member connector (10) arranged at the end of the pressure self-venting module housing (50), the liquid phase pressure transmission passage is arranged in an axial space of the pressure self-venting module housing (50), and the self-venting exhaust passage is arranged in a radial or lateral space of the pressure self-venting module housing (50).
3. The pressure self-venting pressure pipe orifice device as claimed in claim 2, wherein a liquid-gas isolating mechanism (70) is arranged in the inner cavity of the pressure self-venting module shell (50), the liquid-gas isolating mechanism (70) comprises a gas-liquid separating cavity, and the gas is collected and discharged from the gas outlet (30) through a one-way gas venting valve (60) when the preset condition is met.
4. The apparatus of claim 3, wherein the predetermined condition is that the gas in the gas-liquid separation chamber is collected to a pressure sufficient to overcome the opening pressure of the one-way release valve (60).
5. The pressure self-venting pressure-sensing tube nozzle assembly of claim 2, wherein said pressure-venting module housing (50) is provided with an inlet filter housing (90) on a side of said nozzle assembly connector (10) in a hospital, said inlet filter housing (90) for the inflow of liquid forming a restricted flow path in an axial direction.
6. The pressure self-venting pressure intensifier tube orifice device as claimed in claim 2, wherein said orifice member further comprises a fill orifice assembly (20) for replenishing liquid in said liquid phase pressure transfer passage.
7. The apparatus of any one of claims 1 to 6, further comprising a monitoring module, wherein the monitoring module is in signal connection with the pressure acquisition module, and monitors the state in the pressure measuring tube according to the pressure signal acquired by the pressure acquisition module.
8. The method for monitoring an orifice device of a pneumatic self-venting pressure measuring tube as defined in claim 7, comprising the steps of: A pressure signal sequence output by the pressure acquisition module is acquired, Obtaining a pressure characteristic parameter reflecting the change of the pressure signal based on the pressure signal sequence; when the pressure characteristic parameter exceeds a first broad value, judging that the self-venting triggering stage is entered; and continuously acquiring the pressure characteristic parameters, and judging that the self-venting completion stage is entered when the pressure characteristic parameters are lower than a second threshold value.
9. The method of claim 8, wherein the pressure characteristic parameter is a pressure change rate calculated by Where Vi denotes the rate of change of pressure corresponding to the ith sample point, Δt denotes the time interval between two adjacent samples, and Pi denotes the pressure value of the ith second.
10. The method of claim 8, wherein the pressure characteristic parameter is a pressure fluctuation parameter calculated by , wherein, Representing the pressure fluctuation parameter in the kth time window, for reflecting the degree of dispersion of the pressure signal in the time period, M being the time window length, k being the window start index, i being the index of the sampling point in the window, pi representing the pressure value of the ith second, Representing the average pressure value within the kth sliding window.

Description

Air pressure self-discharging type pressure measuring pipe orifice device and monitoring method thereof Technical Field The invention relates to the technical field of liquid pressure measurement, in particular to a precision optimization design in a liquid pressure measurement process. Background In the fields of geotechnical engineering, hydraulic engineering, underground structure monitoring and the like, piezometric tubes are commonly used for acquiring pore water pressure or medium pressure information. The existing pressure measuring pipe system is generally provided with a pressure gauge or an osmometer at the pipe orifice, acquires the pressure in the pipe through a sensing element, and outputs the measured pressure value as monitoring data. However, under long-term operation of the pressure measuring tube or under complex environmental conditions, gas may be inevitably mixed in or gradually generated in the tube, and for example, gas may be accumulated in the pressure measuring tube when water injection is insufficient, temperature changes, medium gassing or pipeline sealing conditions are changed. At this time, the pressure value measured by the osmometer or the manometer does not simply reflect the liquid-phase pressure state, but includes a superimposed component of the gas pressure, thereby affecting the authenticity and accuracy of the measurement result. In the prior engineering practice, aiming at the problem of gas in the pressure measuring pipe, the method is mostly treated by means of manual water supplementing, manual air exhausting or periodic maintenance, but the method relies on manual experience, the operation time is difficult to unify, and the method is not suitable for long-term continuous monitoring scenes. In addition, the conventional pressure gauge or the osmometer only outputs pressure values, cannot distinguish contributions of liquid phase and gas phase in pressure change, and also cannot judge whether the current measurement state is interfered by gas factors or not. Therefore, under the existing pressure measurement technical conditions, how to improve the accuracy of observing the real liquid phase pressure on the premise of not changing the basic measurement principle of the pressure measuring tube is still a technical problem to be solved in the application process of the pressure measuring tube. Disclosure of Invention The invention aims to provide an air pressure self-discharging pressure measuring pipe orifice device and a monitoring method thereof, wherein a liquid phase pressure transmission passage and a self-discharging exhaust passage which are physically isolated are built in a pipe orifice piece, and the collection and the conditional discharge of air are automatically completed. Ensuring that the signal obtained by the pressure acquisition module reflects purely the liquid phase pressure. The authenticity and the reliability of the pressure data are improved, and the method is suitable for long-term and continuous automatic engineering monitoring scenes. In a first aspect of the present invention, there is provided an air pressure self-venting pressure-sensing tube orifice apparatus, said apparatus comprising a tube orifice member and a pressure acquisition module; the pipe orifice piece is arranged at the pipe orifice position of the pressure measuring pipe, a liquid phase pressure transmission passage and a self-venting passage which are mutually isolated are formed inside the pipe orifice piece, wherein, The liquid phase pressure transmission passage is used for guiding the pressure in the pressure measuring pipe to the pressure acquisition module through a liquid column; The self-venting exhaust passage is used for forming gas collection in the pipe orifice piece and venting the gas when preset conditions are met so as to reduce the influence of free gas in the liquid phase pressure transmission passage on pressure transmission; the pressure acquisition module is arranged at the pipe orifice part and communicated with the liquid phase pressure transmission passage and is used for acquiring pressure signals transmitted by the liquid phase pressure transmission passage. In a second aspect of the present invention, there is provided a monitoring method comprising the steps of: A pressure signal sequence output by the pressure acquisition module is acquired, Obtaining a pressure characteristic parameter reflecting the change of the pressure signal based on the pressure signal sequence; when the pressure characteristic parameter exceeds a first broad value, judging that the self-venting triggering stage is entered; and continuously acquiring the pressure characteristic parameters, and judging that the self-venting completion stage is entered when the pressure characteristic parameters are lower than a second threshold value. In summary, the invention has the following beneficial effects: 1. The physical separation of the gas-liquid transmission path is realiz