WO2019010921A1

WO2019010921A1 - Safety valve online monitoring system

Info

Publication number: WO2019010921A1
Application number: PCT/CN2017/117155
Authority: WO
Inventors: 张洪; 张郁
Original assignee: 江南大学
Priority date: 2017-07-11
Filing date: 2017-12-19
Publication date: 2019-01-17
Also published as: CN107219072A

Abstract

A safety valve online monitoring system, comprising a perforated valve bonnet (4), a flange linear bearing (17), a fixing plate (2), a transmission bar (16), a clamping plate sleeve (15), a displacement sensor (1) and an executer (12), a sound wave transmitter (8), a pressure sensor (7), a gateway (9), a computer (10), and a GSM module (11). The perforated valve bonnet (4), the flange linear bearing (17), the clamping plate sleeve (15), and the transmission bar (16) are connected with each other and fixed on a safety valve (6); the displacement sensor (1) and the executer (12) are fixed on the safety valve (6) by means of the fixing plate (2) and the clamping plate sleeve (15); the pressure sensor (7) and the sound wave transmitter (8) are respectively connected to the inlet and the outlet of the safety valve (6); the three sensors form a network with the computer (10) by means of the gateway (9); the computer (10) receives data of the sensors, determines the state of the safety valve (6), and sends an alarm short message to an assigned mobile phone number by means of the GSM module (11) if an abnormal situation occurs. The opening state of the safety valve (6) can be monitored in real time, and alarm can be sent out when the safety valve (6) has an abnormal situation. Moreover, the installation is simple, and the reliability is high.

Description

Safety valve online monitoring system

Technical field

The invention relates to an online monitoring system for safety valves, belonging to the field of monitoring equipment.

Background technique

Safety valves are automatic valves. They are mainly used in boilers, pressure vessels and pipelines. The control pressure does not exceed the specified value. It plays an important role in protecting people's safety and equipment operation. After the safety valve is used for a long period of time, it is prone to rust. And it can not be completely closed after opening, but the existing safety valve online monitoring system has complex structure and inconvenient use, so design a new type of safety valve online monitoring with simple structure, reliable performance, convenient installation and replacement, and easy batch production. The system is necessary.

Summary of the invention

The technical problem to be solved by the invention is to provide a novel safety valve online monitoring system with simple structure, reliable performance, convenient installation and disassembly, and easy mass production.

In order to solve the above technical problem, the technical solution of the present invention is:

An online monitoring system for a safety valve includes a safety valve, a sensor, a mechanical fixture, and a data processing module. The sensor includes a displacement sensor and an actuator thereof, an acoustic wave transmitter, and a pressure sensor, wherein the displacement sensor is installed above the safety valve. It is used to measure the opening amount of the safety valve; the pressure sensor is installed on the inlet pipe of the safety valve to measure the pressure value of the safety valve; the acoustic wave transmitter is installed on the outlet pipe of the safety valve for collecting the safety valve when it is opened The sound signal; the mechanical clamp is divided into an opening bonnet, a screw, a displacement transmission mechanism, a radial limiting mechanism, and a sensor fixing mechanism, wherein the opening bonnet is used to replace the original bonnet of the safety valve, and is used The set screw is fixed on the safety valve; the displacement transmission mechanism passes through the circular hole at the top of the opening bonnet for connecting the valve stem of the actuator and the safety valve, and transmits the displacement amount when the safety valve is opened to the actuator; The radial limiting mechanism is fixed on the opening bonnet for limiting the radial displacement of the displacement transmitting mechanism and improving the accuracy of the displacement transmitting mechanism; The displacement sensor is fixed above the opening bonnet, and the sensing element on the back of the displacement sensor can measure the movement of the actuator; the data processing module is connected with the sensor, and the safety valve state data measured by the sensor is collected in real time and recorded. And saving the state data, at the same time, the data processing module determines whether the opening condition of the safety valve is normal according to the state data, and sends an alarm message if an abnormality occurs.

Its further technical solutions are:

Displacement transmission mechanism: a transmission rod passes through a circular hole at the top of the opening bonnet, and the end of the transmission rod is provided with an internally threaded sleeve, which is fixed by screwing on the external thread of the top end of the safety valve stem; the transmission rod The upper end is provided with external threads, and the sleeve of one splint sleeve is provided with internal threads, and the two are threaded; the splint of the splint sleeve is provided with a through hole, and the actuator has a threaded hole, and the two are screwed.

Radial limiting mechanism: a flange linear bearing is sleeved on the transmission rod, the bearing body of the flange linear bearing is placed in a circular hole at the top of the opening bonnet, and the flange surface is fixed on the opening bonnet by screws; The inner diameter of the flange linear bearing is equal to the outer diameter of the transmission rod, so that the transmission rod can only move in the axial direction, limit the radial displacement, and improve the transmission precision of the displacement transmission mechanism.

Sensor fixing mechanism: a flat surface is arranged on the top side of the opening bonnet, and a threaded hole is arranged on the plane, and the lower half of one fixing plate is fixed on the side plane of the opening bonnet by screws, and the fixing plate half is used. The screw is connected to the back side of the displacement sensor such that the displacement sensor is fixed directly above the safety valve; the upper middle portion of the fixing plate is separated by a rectangular groove, so that the actuator can move up and down in the rectangular groove to transmit the displacement amount.

Data processing module: a gateway through the wireless HART network and sensor networking, the sensor automatically uploads the collected data to a pre-set register in the gateway; at the same time, the gateway is connected to a computer through a network cable, and the monitoring program written by LabVIEW is installed in the computer. The program reads the corresponding register in the gateway to obtain the data of the sensor, and then saves the data in a log file, and can generate a data report file according to the user's operation; and the computer is connected to a GSM module through the data cable. The monitoring software determines whether the state of the safety valve is abnormal according to the data collected by the sensor. If an abnormality occurs, the monitoring program controls the GSM module to send an alarm message to the designated one or more mobile phone numbers.

Compared with the prior art, the present invention has the following advantages:

(1) Most of the mechanical structural parts of the present invention use standard parts such as screws, flanged linear bearings, etc., the number of other mechanical parts is small, and it is easy to process, reducing the cost of mass production.

(2) When using a slot or Phillips screw in a unified manner, all the mechanical structures can be installed with only one screwdriver. The overall mechanical structure is easy to assemble and disassemble, which is convenient for maintenance by the staff.

(3) There is a radial gap between the valve stem of the safety valve and the valve body. After the actual measurement, this clearance will cause the transmission rod connected to the valve stem to generate a radial displacement of up to 3 mm. The radial limiting mechanism can make this radial direction. The error is reduced to 0.01mm, which reduces the measurement inaccuracy caused by the radial vibration of the valve stem on the displacement transmission mechanism during the working process.

(4) The SMS alarm module improves the real-time performance of the monitoring, which is convenient for the management personnel to grasp the abnormal situation of the valve in the first time.

(5) The data collected by the wireless HART network is suitable for the occasion where the sensor has a large distribution space. For example, the transmission distance between a single sensor and the gateway is 228m without occlusion. At the same time, the wireless HART sensor can be used as a relay route. When there are multiple sensors, the transmission distance will be expanded by a multiple of 228m, which avoids the need to pre-lay a large number of cables when the existing sensors use wired to transmit data. In the long-term work environment in the field, wireless HART is not susceptible to interference, and will not encounter risks such as aging and damage of data cables.

DRAWINGS

Figure 1 is a schematic diagram of the safety valve online monitoring system.

Figure 2 is a schematic view of a portion of a mechanical clamp.

Figure 3 is a schematic illustration of an open bonnet.

Figure 4 is a partial cross-sectional view of the interior of the apertured bonnet.

Detailed ways

The invention will now be further described with reference to the drawings and embodiments.

As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, an embodiment of the present invention is an on-line monitoring system for a safety valve, comprising: a safety valve 6 and a valve stem 19 thereof, an opening bonnet 4, Flange linear bearing 17, transmission rod 16, splint sleeve 15, fixing plate 2, screw 3, screw 5, screw 13, screw 14, screw 18, displacement sensor 1 and its actuator 12, pressure sensor 7, acoustic wave transmission 8, computer 10, gateway 9, and GSM module 11.

The opening bonnet 4 replaces the original bonnet of the safety valve 6 and is fixed to the safety valve using a screw 5. The top of the opening bonnet 4 is provided with a circular hole, and the transmission rod 16 passes through a circular hole at the top of the opening bonnet 4, and is connected to the valve stem 19 through a threaded sleeve provided at the end of the transmission rod 16. The flange linear bearing 17 is sleeved on the transmission rod 16, and the bearing body is placed in the circular hole of the opening bonnet 4, and the flange surface is fixed on the threaded hole around the top circular hole of the opening bonnet 4 by using the screw 18. The sleeve of the splint sleeve 15 is internally provided with an internal thread, and the top end of the transmission rod 16 is provided with an external thread, and the two are fixed by screw connection; the splint of the splint sleeve 15 is provided with a circular hole, and the actuator 12 has a thread. The holes are fixed to each other by screws; the side surface of the opening bonnet 4 is provided with a flat surface, and two threaded holes are opened in the plane, and the screw 3 passes through a circular hole in the lower half of the fixing plate 2, and is fixed. The plate 2 is fixed to the side plane of the opening bonnet 4. The upper middle portion of the fixing plate 2 is divided into rectangular grooves and is perpendicular to the clamping plates of the sleeve clamping plate 15 such that the actuator 12 is located in a rectangular groove in the middle of the fixing plate 2. The rear surface of the displacement sensor 1 is provided with four screw holes, which are fixed to the fixed plate 2 by screws 13, and are vertically disposed above the safety valve clamp, while the actuator 12 is located in the groove on the back of the displacement sensor 1.

The diameter of the transmission rod 16 is equal to the inner diameter of the flange linear bearing 17, and when the inside of the safety valve 6 is opened by pressure, the valve stem 19 drives the transmission rod 16 and the clamping sleeve 15 so that the actuator 12 is in the displacement sensor 1 The sensing element of the back moves vertically in the slot, so that the displacement sensor 1 measures the displacement data of the actuator 12. The flange linear bearing 17 constrains the transmission rod 16 to move only in the axial direction, and discharges the radial displacement of the transmission rod 16 due to vibration, thereby ensuring the accuracy of the opening of the safety valve 6.

The displacement sensor 1 is mounted directly above the safety valve 6 for collecting the amount of displacement of the safety valve 6 and automatically transmitting the displacement data to a pre-set register in the gateway 9 via the wireless HART network. The pressure sensor 7 is disposed on the same conduit as the inlet of the safety valve 6, for collecting the pressure experienced by the safety valve 6, and automatically transmitting the pressure data to a pre-set register in the gateway 9 via the wireless HART network. The acoustic wave transmitter 8 is disposed on the pipeline connected to the outlet of the safety valve 6, for collecting noise data emitted when the safety valve 6 is opened and flowing out of the medium, and automatically transmitting the noise data to the gateway 9 through the wireless HART network. On the register. The computer 10 is equipped with a monitoring program written by LabVIEW, which reads the registers in the gateway 9 through the data cable, thereby acquiring the data collected by the pressure sensor 7, the displacement sensor 1, and the acoustic wave transmitter 8.

The monitoring program in the computer 10 determines whether the safety valve 6 is normal when the pressure is too large according to the pressure value measured by the pressure sensor 7, the displacement value measured by the displacement sensor 1, and the medium flow measured by the acoustic wave transmitter 8. Whether the safety valve 6 is normally closed after the pressure is reduced or below the opening pressure, if an abnormality occurs in the above two cases, the monitoring program automatically generates an alarm information in real time, and controls the GSM module 11 to send the alarm information through the data cable. The time limit of the alarm information is ensured to the specified mobile phone number.

The present invention is not limited to the specific embodiments described above, and various changes made by those skilled in the art without departing from the inventive concept are intended to fall within the scope of the present invention.

Claims

An online monitoring system for a safety valve, comprising a safety valve (6), a sensor, a mechanical fixture, and a data processing module, wherein the sensor comprises a displacement sensor (1) and an actuator (12), and an acoustic wave transmitter ( 8) a pressure sensor (7), wherein the displacement sensor (1) is mounted above the safety valve (6) for measuring the opening amount of the safety valve (6); the pressure sensor (7) is mounted on the safety valve (6) The inlet pipe is used to measure the pressure value of the safety valve (6); the acoustic wave transmitter (8) is installed on the outlet pipe of the safety valve (6) for collecting the sound signal when the safety valve (6) is opened; The mechanical clamp is divided into an opening bonnet (4), a screw, a displacement transmission mechanism, a radial limiting mechanism, and a sensor fixing mechanism, wherein the opening bonnet (4) is used to replace the original safety valve (6) a bonnet and fixed to the safety valve (6) using a set screw (5); the displacement transmission mechanism passes through a circular hole at the top of the opening bonnet (4) for connecting the actuator (12) to the valve of the safety valve The rod (19) transmits the displacement amount when the safety valve (6) is opened to the actuator (12); the radial limiting mechanism is fixed to the opening bonnet (4) for use The radial displacement of the displacement transmission mechanism is limited to improve the accuracy of the displacement transmission mechanism; the sensor fixing mechanism fixes the displacement sensor (1) above the opening bonnet (4), and the sensing element on the back of the displacement sensor (1) can be measured. The movement of the actuator (12); the data processing module is connected to the sensor, real-time collects the safety valve (6) state data measured by the sensor, and records and saves the state data, and the data processing module determines according to the state data. Whether the opening of the safety valve (6) is normal or not, if an abnormality occurs, an alarm message is sent.
The safety valve online monitoring system according to claim 1, wherein the displacement transmitting mechanism is: a transmission rod (16) passes through a circular hole in the top of the opening bonnet (4), and the transmission rod (16) The end is provided with an internally threaded sleeve fixed to the external thread of the top end of the safety valve stem (19) by a threaded connection; the upper end of the transmission rod (16) is provided with an external thread, and the sleeve of a splint sleeve (15) is set. There are internal threads, which are connected by screws; the splint of the splint sleeve (15) is provided with a through hole, and the actuator (12) has a threaded hole, and the two are connected by screws (14).
The safety valve online monitoring system according to claim 1, characterized in that: the radial limiting mechanism is: a flange linear bearing (17) sleeved on the transmission rod (16), the bearing of the flange linear bearing (17) The body is placed in a circular hole in the top of the opening bonnet (4), and the flange face is fixed to the opening bonnet (4) using screws (18).
The safety valve online monitoring system according to claim 3, wherein the inner diameter of the flange linear bearing (17) is equal to the outer diameter of the transmission rod (16), thereby ensuring that the transmission rod (16) can only be in the axial direction. Movement, limiting radial displacement, improves the transmission accuracy of the displacement transmission mechanism.
The safety valve online monitoring system according to claim 1, wherein the sensor fixing mechanism is: a flat surface is arranged on the top side of the opening bonnet (4), and a threaded hole is arranged on the plane, and a fixing plate (2) The lower half of the fixing plate is fixed to the side plane of the opening bonnet (4) by screws (3), and the upper half of the fixing plate (2) is connected to the back surface of the displacement sensor (1) by screws (13), thereby making the displacement sensor (1) is fixed directly above the safety valve (6); the upper middle portion of the fixed plate (2) is separated by a rectangular groove, so that the actuator (12) can move up and down in this rectangular groove to transmit the displacement amount.
The safety valve online monitoring system according to claim 5, characterized in that the rectangular groove on the fixing plate (2) and the clamping plate of the sleeve plate (15) are perpendicular to each other.
The safety valve online monitoring system according to claim 5, characterized in that the displacement sensor (1) has a plurality of threaded holes on its back.
The safety valve online monitoring system according to claim 1, wherein the data processing module is: a gateway (9) is connected to the sensor through a wireless HART network, and the sensor automatically uploads the collected data to the gateway (9). The preset register is connected; at the same time, the gateway (9) is connected to a computer (10) through a network cable, and a monitoring program written by LabVIEW is installed in the computer (10), and the program reads the corresponding register in the gateway (9) to obtain the sensor. Data, then save the data in a log file, and generate a data report file according to the user's operation; at the same time, the computer (10) is connected to a GSM module (11) through a data cable, and the monitoring software collects data according to the sensor. It is judged whether the state of the safety valve (6) is abnormal. If an abnormality occurs, the monitoring program controls the GSM module (11) to send an alarm message to the designated one or more mobile phone numbers.
A safety valve comprising an on-line monitoring system for a safety valve according to any of claims 1-8.
An apparatus comprising the safety valve of claim 9.