A pipeline pressure measurement terminal system

Abstract

The invention discloses a pipeline pressure measurement terminal system, comprising a hollow pipeline fixing base, the pipeline fixing base is installed on the pipe wall of the pipeline, a pressure sensing unit is installed on the pipeline fixing base, a pressure sensing end face is provided on the pipeline, and pressure is transmitted between the pressure sensing end face and the pressure sensing unit through silicone oil. The invention can accurately measure the pressure of both solid and liquid fluids.

Description

Technical Field

[0001] The invention belongs to the technical field of on-site pressure monitoring and relates to a pipeline pressure measuring terminal system. Background Art

[0002] In industrial sites, real-time pressure monitoring of pipeline operation is an important necessity. Monitoring the real-time pressure data of the pipeline can avoid on-site operation problems caused by abnormal pressure, as well as various losses caused on-site due to pipeline damage after the pressure exceeds the standard. Conventional pressure measuring and transmitting equipment only supports pressure measurement under general fluids. For scenarios where the running medium in the pipeline is a viscous fluid that is easy to harden, this type of conventional equipment will cause distortion of pressure signal measurement due to blockage at the measuring end, and due to blockage, damage and other reasons, its service life is one percent or even less of that of conventional fluid applications, which does not meet the use requirements. Therefore, this scenario lacks special equipment for real-time pressure measurement. Summary of the invention

[0003] The purpose of the present invention is to provide a pipeline pressure measurement terminal system, which can accurately measure the pressure of both solid and liquid fluids.

[0004] The technical solution adopted by the present invention is a pipeline pressure measuring terminal system, including a hollow pipeline fixing base, the pipeline fixing base is installed on the pipe wall of the pipeline, a pressure sensing unit is installed on the pipeline fixing base, a pressure sensing end face is provided on the pipeline, and pressure is transmitted between the pressure sensing end face and the pressure sensing unit through silicone oil.

[0005] The present invention is also characterized in that:

[0006] The pressure sensing unit includes a pressure sensing body, on which a clamping nut and a pressure measuring core are respectively provided. The clamping nut is tightly pressed against the pressure measuring core. A silicone oil filling cavity is also provided inside the pressure sensing body. The silicone oil filling cavity is located directly below the pressure measuring core. The silicone oil filling cavity is filled with silicone oil. The upper end of the silicone oil filling cavity is connected to the bottom of the pressure measuring core, and the lower end of the silicone oil filling cavity is connected to the bottom of the pressure sensing body.

[0007] The lower end of the pressure sensing body and the pressure sensing end face are connected by brazing.

[0008] The pressure sensing body and the clamping nut are connected by threads.

[0009] A groove is provided on the pipe wall of the pipe, the pipe fixing base is vertically placed and installed in the groove, and the pressure sensing end face is arranged at the bottom of the groove.

[0010] The pressure measuring core is connected to the measuring conversion main control circuit;

[0011] The measurement conversion main control circuit includes a central processing unit, and the central processing unit is respectively connected to the conversion circuit, the power management unit, the data storage unit and the communication port.

[0012] The beneficial effect of the present invention is that the pipeline pressure measurement terminal system of the present invention can perform accurate pressure measurement of both solid and liquid fluids without being limited to it, and will not cause the equipment to measure beyond its own accuracy level due to the phenomenon of viscous fluid hardening on the measuring end face, thereby meeting the requirements for normal operation of the equipment during long-term field applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a pipeline pressure measurement terminal system of the present invention;

[0014] Figure 2 It is a structural schematic diagram of a measurement conversion main control circuit of a pipeline pressure measurement terminal system of the present invention.

[0015] In the figure, 1. housing, 2. locking nut, 3. pressure sensing body, 4. pressure measuring core, 5. sealing gasket I, 6. pipe fixing base, 7. silicone oil filling cavity, 8. pressure sensing end face, 9. sealing gasket II, 10. pipe, 11. central processing unit, 12. conversion circuit, 13. power management unit, 15. data storage unit, 16. communication port. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The present invention provides a pipeline pressure measurement terminal system, such as Figure 1 As shown, it includes a hollow pipe fixing base 6, which is installed on the pipe wall of the pipe 10. A groove is opened on the pipe wall of the pipe 10, and a pressure sensing end face 8 is correspondingly provided at the bottom of the groove. The pipe fixing base 6 is installed in the groove along the vertical direction, and a sealing gasket II9 is ​​provided at the connection between the pipe fixing base 6 and the groove of the groove. A pressure sensing body 3 is coaxially installed at the center of the pipe fixing base 6, and the upper end of the pressure sensing body 3 is connected to the outer shell 1 by threads, and a sealing gasket I5 is provided at the connection between the lower end of the pressure sensing body 3 and the pipe fixing base 6; the lower end of the pressure sensing body 3 and the pipe fixing base 6 are connected by threads.

[0018] The bottom of the pressure sensing body 3 is connected to the pressure sensing end face 8 by brazing; the pressure sensing body 3 is provided with a clamping nut 2 and a pressure measuring core 4, respectively, the clamping nut 2 is pressed tightly against the pressure measuring core 4, the clamping nut 2 and the pressure sensing body 3 are connected by threads (the pressure sensing body 3 is provided with cavities for placing the clamping nut 2 and the pressure measuring core 4, respectively), the upper end face of the pressure measuring core 4 is provided with a copper washer, and the gap around the contact point between the clamping nut 2 and the pressure measuring core 4 is sealed by the copper washer. A silicone oil filling cavity 7 is also provided inside the pressure sensing body 3, and the silicone oil filling cavity 7 is located directly below the pressure measuring core 4. The silicone oil filling cavity 7 forms a gap inside the pressure sensing body 3, and plays a role in transmitting pressure strain by filling the silicone oil into the silicone oil filling cavity 7. The lower end of the silicone oil filling cavity 7 is connected with the bottom of the pressure sensing body 3, and the silicone oil filled in the silicone oil filling cavity 7 is in contact with the pressure sensing end face 8. The outer wall of the pipe fixing base 6 and the inner wall of the groove are connected by threads. The upper end of the silicone oil filling cavity 7 is connected to the bottom of the pressure measuring core 4. A sealing gasket 15 is provided at the connection port between the pressure sensing body 3 and the pipe fixing base 6. Combined with the pipe wall thickness, the pressure sensing end face 8 is flush with the inner surface of the pipe 10.

[0019] The pressure sensing end face 8 is used for pressure sensing, which increases the contact area with the fluid in the pipeline 10, reduces the occurrence of hardening of the measuring fluid medium, reduces the blockage residue, and facilitates the pressure effect of the solid-liquid two-phase fluid on the measuring unit. The pressure sensing end face 8 is flush with the inner wall of the pipeline 10 to avoid the introduction of additional measurement errors.

[0020] The pressure measurement core 4 is connected to the measurement conversion main control circuit. Figure 2 As shown, the measurement conversion main control circuit includes a central processing unit 11, and the central processing unit 11 is connected to a conversion circuit 12, a power management unit 13, a data storage unit 15 and a communication port 16 respectively.

[0021] The conversion circuit 12 uses a bridge circuit to convert electrical signals, and the circuit has a lossless and low-loss amplification function.

[0022] The power management unit 13 determines the power supply status of the central processing unit 11, and the power management unit realizes a wide voltage power supply from DC5V to DC40V through hardware bypass;

[0023] The data storage unit 15 is used to record device configuration data and realize data storage in a power-off state.

[0024] The communication port 16 is connected to the central processing unit 11 and supports two-way communication. The device parameters can be set through the configuration components matched with the device to change the measurement scenarios applicable to the device;

[0025] The working process of a pipeline pressure measurement terminal system of the present invention is as follows: the device is installed at a groove on a pipeline 10, and the pressure measurement sensing end face 8 contacts the pipeline measurement medium. After being deformed by force, the pressure is transmitted to the pressure measurement core 4 through the silicone oil inside the silicone oil filling cavity 7. The pressure measurement core 4 converts the pressure change into an electrical signal, and sends the electrical signal to a conversion circuit 12. The electrical signal is converted into measured data through the conversion circuit 12, and the converted measured data is sent to a central processing unit 11. The Kalman redundancy filtering algorithm is called in the central processing unit 11 to obtain denoised electrical measurement data, and the denoised electrical measurement data is interpolated to obtain pipeline pressure measurement data.

[0026] The implementation process of the Kalman redundancy filter algorithm is as follows: according to the measurement rate, the system oversamples the data at more than twenty times the measurement rate. The principle of Kalman filtering is:

[0027] 1. Calculate the correction matrix (filter gain) K k :

[0028]

[0029] 2. Update observation value (state prediction value)

[0030]

[0031] 3. Update the error covariance P k :

[0032]

[0033] in, Initial measured data (measured data after conversion by conversion circuit 12), P - k ,H,R,z k These are all parameters in the covariance calculation process. According to the configurable damping level, the gain coefficient K of the filtering algorithm is established. k A set of monotonic change relationships is formed to realize the adjustment function of the overall gain coefficient of the algorithm through the damping level; the distribution of the electrical measurement signal data after gain correction by the Kalman filter redundancy algorithm is x1, x2, ..., x n , n is the number of data, and the average value M of each data is calculated. The formula is as follows:

[0034]

[0035] Substitute into discrete variance calculation:

[0036]

[0037] Get the dispersion "δ2 ", according to the above damping level, the data in the discrete band that meets the damping level is weighted, the overall data is calculated to get the mean, and the pipeline pressure measurement data is obtained by interpolation calculation.

Claims

1. A pipeline pressure measurement terminal system, characterized in that: It includes a hollow pipe fixing base, which is installed on the pipe wall of the pipe, a pressure sensing unit is installed on the pipe fixing base, a pressure sensing end face is provided on the pipe, and pressure is transmitted between the pressure sensing end face and the pressure sensing unit through silicone oil; The pressure sensing unit comprises a pressure sensing body, on which a clamping nut and a pressure measuring core are respectively provided, the clamping nut is tightly pressed on the pressure measuring core, a silicone oil filling cavity is also provided inside the pressure sensing body, the silicone oil filling cavity is located directly below the pressure measuring core, the silicone oil filling cavity is filled with silicone oil, the upper end of the silicone oil filling cavity is connected to the bottom of the pressure measuring core, and the lower end of the silicone oil filling cavity is connected to the bottom of the pressure sensing body; The lower end of the pressure sensing body and the pressure sensing end surface are connected by brazing; The pressure sensing body and the compression nut are connected by threads; A groove is provided on the pipe wall of the pipe, the pipe fixing base is vertically placed and installed in the groove, and the pressure sensing end face is arranged at the bottom of the groove; The pressure measurement core is connected to the measurement conversion main control circuit; The measurement conversion main control circuit includes a central processing unit, and the measurement conversion main control circuit includes a central processing unit, and the central processing unit is respectively connected to the conversion circuit, the power management unit, the data storage unit and the communication port; The pressure measurement process of the pipeline pressure measurement terminal system is as follows: the pipeline pressure measurement terminal system is installed in the groove on the pipeline, the pressure measurement sensing end face contacts the pipeline measurement medium, and after being deformed by force, the pressure is transmitted to the pressure measurement core through the silicone oil inside the silicone oil filling cavity, and the pressure measurement core converts the pressure change into an electrical signal, and sends the electrical signal to the conversion circuit, and the electrical signal is converted into measured data through the conversion circuit, and the converted measured data is sent to the central processing unit, and the Kalman redundancy filtering algorithm is called in the central processing unit to obtain the denoised electrical measurement data, and the denoised electrical measurement data is interpolated to obtain the pipeline pressure measurement data; The implementation process of the Kalman redundancy filter algorithm is as follows: According to the measurement rate, the system oversamples the data at more than twenty times the measurement rate. The specific process of Kalman filtering is as follows: 1) Calculate the modified matrix filter gain : （1）； 2) Update the observed value state prediction value : （2）； 3) Update error covariance : （3）； in, Initial measured data, are all parameters in the covariance calculation process. The distribution of the electrical measurement signal data after gain correction by the Kalman filter redundancy algorithm is: , n is the number of data, and the average value M of each data is calculated. The formula is as follows: （4）； Substitute into discrete variance calculation: （5）； Get the discreteness" ", according to the damping level, the data in the discrete band that meets the damping level is weighted, the overall data is calculated to get the mean, and the pipeline pressure measurement data is obtained by interpolation calculation.

Images