CN117346982B - Buried ball valve internal leakage detection device and method - Google Patents
Buried ball valve internal leakage detection device and method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 125
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052744 lithium Inorganic materials 0.000 claims description 6
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- 239000012530 fluid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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Abstract
The invention discloses an internal leakage detection device and method for a buried ball valve, which belong to the technical field of internal leakage detection of valves, and the detection of the internal leakage is realized through the change of the volume pressure in a cavity; the invention can perform wavelet threshold denoising and abnormal value detection data preprocessing on the collected pressure change data of the valve cavity of the buried earth valve, and further judge the internal leakage of the ball valve; by the pressure of the cavity of the buried earth valveJudging whether internal leakage occurs or not by whether the change occurs, and judging the pressure of the valve cavity of the earth buried valveWhen the pressure data is changed, in order to avoid the influence of noise on the pressure data, the collected pressure change data of the valve cavity of the buried earth valve is subjected to wavelet threshold denoising and abnormal value detection, and the differential pressure is calculated after the data processing，Is the target pressure, if the pressure difference isIf the internal leakage is continuously increased, the internal leakage is generated, otherwise, the internal leakage is not generated. The invention can effectively solve the technical problems of difficult internal leakage detection and data acquisition and difficult remote monitoring in the prior art.
Description
Technical Field
The invention relates to the technical field of valve internal leakage detection, in particular to an internal leakage detection device and method for a buried ball valve.
Background
In natural gas pipeline systems, earth-buried valves are a critical device for controlling the flow of fluids (e.g., liquids or gases). During operation, the earth-buried valve needs to remain tightly sealed to ensure that fluid does not leak. However, ball valves may leak inwardly due to various reasons, including material fatigue, design defects, or improper operation, which may lead to problems of equipment failure, resource waste, and environmental pollution. Therefore, periodic inspection of buried earth valves is critical to ensure proper operation and safety. The existing ball valve internal leakage detection methods mainly comprise pressure detection, acoustic emission detection and the like, and the problems that the internal leakage detection and the data acquisition are difficult, the remote monitoring is difficult and the like exist in the methods.
The application number is: the invention discloses a method and a system for detecting internal leakage of a buried ball valve based on valve cavity pressure, belonging to the technical field of internal leakage detection of valves, wherein the method and the system are disclosed in CN202111663836.6 (hereinafter referred to as prior art 1). According to the method, the leakage quantity of the internal leakage of the buried ball valve is obtained, and inversion of the internal leakage rate of the ball valve is realized by utilizing the BP neural network, so that the internal leakage quantity of the buried earth valve is obtained through detection. The system can comprise a signal acquisition denoising unit, a feature extraction unit, an internal leakage inversion unit and a judgment output unit. The invention can realize qualitative judgment of the internal leakage of the buried earth valve; inversion of the leakage rate can be achieved through a neural network to obtain a specific value of the leakage quantity; the method can realize the grading judgment of the internal leakage degree of the valve according to the specific numerical value of the internal leakage of the valve and in combination with the standard requirements related to projects; the method can help in field treatment of internal leakage, reduces valve damage and saves maintenance cost of the valve.
In the prior art 1, inversion of the leakage rate is realized through a neural network to obtain a specific value of the leakage quantity, and the detection method is complex and has low detection efficiency.
Disclosure of Invention
The invention aims to provide an internal leakage detection device and method for a buried ball valve, which can effectively solve the technical problems that the internal leakage detection and data acquisition are difficult and the remote monitoring is difficult in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the buried ball valve inner leakage detection method comprises the following steps of adopting a buried ball valve inner leakage detection device with the following structure to detect;
the buried ball valve internal leakage detection device comprises a high-pressure hose, a No. 1 threaded connector, a pressure sensor, a multi-way connector, a No. 2 threaded connector, a stop valve, a main controller, an A/D module, a storage module, a function key, a display module, a communication module and a power supply module; the buried ball valve internal leakage detection device is connected with a drain outlet of the ball valve to be detected through a high-pressure hose when the buried ball valve internal leakage is detected; the buried ball valve internal leakage detection device is connected with a high-pressure hose and a multi-way joint through a No. 1 threaded joint; the buried ball valve internal leakage detection device is connected with the pressure sensor through a multi-way joint; the buried ball valve internal leakage detection device is connected with the A/D module through a pressure sensor; the buried ball valve internal leakage detection device is connected with the multi-way joint and the stop valve through a No. 2 threaded joint; the main controller is connected with the A/D module, the storage module, the function keys, the display module, the communication module and the power supply module;
the specific detection method comprises the following steps:
s1: the ball valve to be detected is completely closed, a high-pressure hose of the detection device is connected with a drain outlet of the buried earth valve to be detected, a stop valve of the detection device is closed, a power supply of the detection device is turned on by pressing a key 1, a display screen of the detection device displays real-time pressure of a valve cavity of the buried earth valve, the drain valve of the ball valve to be detected is turned on, and the detection device is connected with the valve cavity of the ball valve; slowly opening a stop valve of the detection device to release pressure of the valve cavity to be lower than the pipeline running pressure, and releasing the pressure to the target pressureClosing a stop valve of the detection device;
s2: pressing the key 2 to start the internal leakage detection of the buried ball valve, if the key 2 is pressed again to stop the internal leakage detection of the buried ball valve, if the key 2 is not pressed, the detection device automatically collects pressure data for 10 minutes according to the set frequency, and remotely transmits a pressure signal of a valve cavity of the buried ball valve to an upper computer in real time to monitor pressure change; automatically storing the pressure data into the SD card after the detection is finished;
s3: by passing throughPressure of buried earth valve cavityJudging whether internal leakage occurs or not by judging whether the valve is changed or not, and when the pressure of the valve cavity of the earth-buried valve is +.>When the pressure data is changed, in order to avoid the influence of noise on the pressure data, the collected pressure change data of the valve cavity of the buried earth valve is subjected to wavelet threshold denoising and abnormal value detection, and the differential pressure is calculated after the data processing>，/>Is the target pressure if the pressure difference is +>If the internal leakage is continuously increased, the internal leakage is generated, otherwise, the internal leakage is not generated.
Wherein the multi-way joint is a three-way joint or a four-way joint.
The main controller is an STM32F103RBT6 processor, collects valve cavity pressure signals through the pressure sensor, and controls the A/D module to be used for converting analog signals into digital signals.
Furthermore, the storage module is an SD card, the main controller stores the valve cavity pressure digital signal data converted by the A/D module by controlling the storage module for further analysis and processing, and a plurality of storage units are created for each storage, so that the data stored each time are ensured not to be interfered.
Preferably, the key 1 is a power switch button, the key 2 is a buried earth valve internal leakage detection start/stop button, and the key 3 is a sampling frequency parameter setting button.
Further, the display module is an LCD display screen, and the display screen displays the valve cavity pressure of the buried earth valve.
The communication module is a ZigBee module, the main controller can remotely communicate with the upper computer through the control communication module, the upper computer can remotely set sampling frequency parameters and control the buried ball valve internal leakage detection device to start/stop detection, and the buried ball valve cavity pressure signal is transmitted to the upper computer in real time for monitoring, and pressure data can be stored and historical data can be checked.
Preferably, the power supply module comprises a 24V lithium battery and an electric quantity display meter, and respectively supplies power to the main controller, the display screen and the pressure sensor after the lithium battery is depressurized, and displays the electric quantity of the power supply in real time and gives an early warning of low electric quantity.
Compared with the prior art, the invention has the following beneficial effects:
in actual use, the high-pressure hose is connected with the drain outlet of the earth-buried valve, and the main controller controls the pressure sensor to collect the pressure signal of the valve cavity of the earth-buried valve, so that the real-time data storage can be realized; the display screen displays the valve cavity pressure of the buried earth valve; the communication module is communicated with the upper computer to display remote data and detect the remote buried earth valve; the method can perform wavelet threshold denoising and abnormal value detection data preprocessing on the collected pressure change data of the valve cavity of the earth-buried valve, and further judge the internal leakage of the ball valve; by the pressure of the cavity of the buried earth valveJudging whether internal leakage occurs or not by judging whether the valve is changed or not, and when the pressure of the valve cavity of the earth-buried valve is +.>To avoid the influence of noise on the pressure data, the pressure change data of the valve cavity of the buried earth valve is subjected to wavelet threshold denoising and abnormal value detection, and the differential pressure is calculated after the data processing>If the pressure difference is->If the internal leakage is continuously increased, the internal leakage is generated, otherwise, the internal leakage is not generated. The invention can effectively solve the problems of difficult internal leakage detection and data acquisition and difficult remote monitoring in the prior artProblems.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of the system of the present invention.
Fig. 2 is a schematic diagram of the overall structure of the present invention.
FIG. 3 is a flow chart of the detection method of the present invention.
Fig. 4 is a schematic overall structure of a second embodiment of the present invention.
Fig. 5 is an enlarged partial schematic view of fig. 4 at a in accordance with the present invention.
Reference numerals:
1-a high pressure hose; a threaded joint No. 2-1; 3-a pressure sensor; 4-three-way joint; a threaded joint 5-2; 6-a stop valve; 7-a ball valve drain outlet; 8-a four-way joint; 9-an outer cylinder; 10-a piston plate; 11-a threaded rod; 12-pushing rod; 13-a spring; 14-sealing rings; 15-bulge; 16-round holes; 17-a guide slot; 18-mounting holes; 19-a limiting pin; 20-bearing.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in numerous different ways without departing from the spirit or scope of the embodiments of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
In the description of the embodiments of the present invention, it should be understood that the terms "length," "vertical," "horizontal," "top," "bottom," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the embodiments of the present invention and to simplify the description, rather than to indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless explicitly defined otherwise.
In the embodiments of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.
In embodiments of the invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.
The following disclosure provides many different implementations, or examples, for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the present invention, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the present invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1-3, the embodiment discloses an internal leakage detection device of a buried ball valve, which comprises a high-pressure hose 1, a number 1 threaded joint 2, a pressure sensor 3, a multi-way joint/four-way joint 8, a number 2 threaded joint 5, a stop valve 6, a main controller, an a/D module, a storage module, a function key, a display module, a communication module and a power supply module; in the embodiment, a multi-way joint is preferred, and the buried ball valve internal leakage detection device is kept connected with a ball valve drain outlet 7 to be detected through a high-pressure hose 1 when the buried ball valve internal leakage is detected; the buried ball valve internal leakage detection device is connected with a high-pressure hose 1 and a multi-way joint through a No. 1 threaded joint; the buried ball valve internal leakage detection device is connected with the pressure sensor 3 through a multi-way joint; the buried ball valve internal leakage detection device is connected with the A/D module through a pressure sensor 3; the buried ball valve internal leakage detection device is connected with the multi-way joint and the stop valve 6 through a No. 2 threaded joint; the main controller is connected with the A/D module, the storage module, the function key, the display module, the communication module and the power supply module, and the function key comprises a key 1, a key 2 and a key 3.
In this embodiment, the multi-way joint is a three-way joint 4.
The main controller is an STM32F103RBT6 processor, collects valve cavity pressure signals through the pressure sensor 3, and controls the A/D module to convert the analog signals into digital signals.
The storage module is an SD card, the main controller stores the valve cavity pressure digital signal data converted by the A/D module through the control storage module for further analysis and processing, and a plurality of storage units are created for each storage, so that the data stored each time are ensured not to be interfered.
Wherein, the key 1 is a power switch button, the key 2 is a buried earth valve internal leakage detection start/stop button, and the key 3 is a sampling frequency parameter setting button;
wherein, the display module comprises a 7.4 inch LCD display screen; the display screen displays the pressure of the valve cavity of the buried earth valve, and can monitor the pressure change of the valve cavity of the buried earth valve on site.
The communication module is a ZigBee module, the main controller can remotely communicate with the upper computer through the control communication module, the upper computer can remotely set sampling frequency parameters and control the buried ball valve internal leakage detection device to start/stop detection, and the buried ball valve cavity pressure signal is transmitted to the upper computer in real time for monitoring, and pressure data can be stored and historical data can be checked.
The power supply module comprises a 24V lithium battery and an electric quantity display meter, and is used for respectively supplying power to the main controller, the display screen and the pressure sensor 3 after the voltage of the lithium battery is reduced, displaying the electric quantity of a power supply in real time and giving an early warning of low electric quantity.
In addition, the embodiment also discloses a buried ball valve internal leakage detection method, which comprises the following steps of:
s1: the ball valve to be detected is completely closed, a high-pressure hose 1 of a detection device is connected with a drain outlet 7 of the buried earth valve to be detected, a stop valve 6 of the detection device is closed, a power supply of the detection device is turned on by pressing a key 1, a display screen of the detection device displays real-time pressure of a valve cavity of the buried earth valve, the drain valve of the ball valve to be detected is turned on, and the detection device is connected with the valve cavity of the ball valve; slowly opening a stop valve 6 of the detection device to release the pressure of the valve cavity to be lower than the pipeline running pressure, and releasing the pressure to the target pressureClosing the detection device stop valve 6;
s2: pressing the key 2 to start the internal leakage detection of the buried ball valve, if the key 2 is pressed again to stop the internal leakage detection of the buried ball valve, if the key 2 is not pressed, the detection device automatically collects pressure data for 10 minutes according to the set frequency, and remotely transmits a pressure signal of a valve cavity of the buried ball valve to an upper computer in real time to monitor pressure change; automatically storing the pressure data into the SD card after the detection is finished;
s3: by the pressure of the cavity of the buried earth valveJudging whether internal leakage occurs or not by judging whether the valve is changed or not, and when the pressure of the valve cavity of the earth-buried valve is +.>When the pressure data is changed, in order to avoid the influence of noise on the pressure data, the collected pressure change data of the valve cavity of the buried earth valve is subjected to wavelet threshold denoising and abnormal value detection, and the differential pressure is calculated after the data processing>，/>Is the target pressure if the pressure difference is +>If the internal leakage is continuously increased, the internal leakage is generated, otherwise, the internal leakage is not generated.
When the pipeline system is in operation, after the valve is closed, the pressure in the valve cavity of the valve can be in a static stable state within a certain time, and the pressure value in the valve cavity is smaller than the pressure of the pipeline system or equal to the pressure value. The blow-off valve is opened, the valve cavity is communicated with the buried earth valve internal leakage detection device, the pressure in the valve cavity is larger than the pressure in the buried earth ball valve internal leakage detection device, a medium in the valve cavity moves towards the buried earth ball valve internal leakage detection device, and the pressure value in the valve cavity is reduced along with the increase of time. After the stop valve 6 is closed, if the valve cavity pressure is in a stable state within a certain time, the valve sealing performance is good, and internal leakage does not occur; if the valve cavity pressure increases with time within a certain period of time, the valve is finally in a stable state, and the pressure value after the stability is the same as the pressure of the operation pipeline, the valve is internally leaked.
Example two
Referring to fig. 4-5, this embodiment is basically the same as the first embodiment, except that in this embodiment, referring to fig. 4, the multi-way joint is a four-way joint 8, the pressure sensor 3 is installed at the four-way joint 8, another interface of the four-way joint 8 is connected with an adjusting mechanism, the adjusting mechanism comprises an outer cylinder 9, a piston plate 10, a threaded rod 11, a push rod 12 and a spring 13, the piston plate 10 is slidably arranged in the outer cylinder 9, at least two sealing rings 14 are arranged between the piston plate 10 and the outer cylinder 9, and a multiple sealing structure is formed by the sealing rings 14; the outer cylinder 9 one end is connected with the cross joint 8, the other end is sealed and is provided with the screw hole, the threaded rod 11 with the screw hole cooperation, push rod 12 is located the urceolus 9 and lower extreme and threaded rod 11 screw connection, be provided with protruding 15 on the piston board 10, protruding 15 tip is provided with round hole 16, protruding 15 side is provided with the guide slot 17 with round hole 16 intercommunication, push rod 12 upper end is provided with mounting hole 18, push rod 12 upper end extends to in the round hole 16, is provided with spacer 19 in the mounting hole 18, spacer 19 passes guide slot 17, spring 13 is located urceolus 9, spring 13 upper end and piston board 10 contact, the lower extreme contacts with urceolus 9 tip.
Thus, a detection and buffer mechanism can be formed at the four-way joint 8; in actual use, when gas in the valve cavity enters the buried ball valve inner leakage detection device, high-pressure gas in the valve cavity suddenly enters the buried ball valve inner leakage detection device, impact vibration of the buried ball valve inner leakage detection device is easy to cause, the buried ball valve inner leakage detection device is easy to leak, and therefore larger errors are easy to occur when detection is performed, and the errors are likely to be that the gas in the valve cavity suddenly enters the buried ball valve inner leakage detection device, so that leakage of a joint is caused, and misjudgment of the valve is caused.
If the shutoff valve 6 is opened, although a shock is not caused, leakage of the medium is easily caused.
In actual use, the threaded rod 11 is in rotational connection with the push rod 12 via the bearing 20.
The high-pressure hose 1 is also connected with a drain outlet valve.
According to the embodiment, the piston plate 10, the spring 13, the push rod 12 and the threaded rod 11 are arranged to form a buffer mechanism, and the guide groove 17 is arranged to enable the piston plate 10 to be in an active state inside the outer barrel 9, but the piston plate 10 can only move on a preset stroke under the limiting action of the limiting pin 19, when high-pressure gas enters, the piston plate 10 moves at the moment, the purpose of buffering is achieved under the action of the spring 13, the impact on the buried ball valve inner leakage detection device is avoided, the possibility of leakage of the buried ball valve inner leakage detection device is reduced, and the accuracy of detection results is guaranteed.
Meanwhile, under the action of the push rod 12 and the threaded rod 11, the piston plate 10 can stop after the piston plate 10 reaches the limit position; although the piston plate 10 has balanced pressure after buffering impact in use, the pressure in the buried ball valve internal leakage detection device will gradually increase after the ball valve internal leakage occurs due to the two limit positions of the piston plate 10, so as to push the piston plate 10 to the limit positions; thus, in actual use, the pressure of the spring 13 needs to be less than the pressure in the ball valve line system under test.
Before testing, after the drain valve and the stop valve 6 are closed, the piston plate 10 is driven to move by rotating the screw rod, so that the internal pressure of the buried ball valve internal leakage detection device is adjusted, the tightness of the buried ball valve internal leakage detection device is detected, and the detection efficiency is improved without external connection or additional airtight detection mechanisms.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The utility model provides a leak detection device in buried ball valve which characterized in that: the buried ball valve internal leakage detection device comprises a high-pressure hose, a No. 1 threaded connector, a pressure sensor, a multi-way connector, a No. 2 threaded connector, a stop valve, a main controller, an A/D module, a storage module, a function key, a display module, a communication module and a power supply module; the buried ball valve internal leakage detection device is connected with a drain outlet of the ball valve to be detected through a high-pressure hose when the buried ball valve internal leakage is detected; the buried ball valve internal leakage detection device is connected with a high-pressure hose and a multi-way joint through a No. 1 threaded joint; the buried ball valve internal leakage detection device is connected with the pressure sensor through a multi-way joint; the buried ball valve internal leakage detection device is connected with the A/D module through a pressure sensor; the buried ball valve internal leakage detection device is connected with the multi-way joint and the stop valve through a No. 2 threaded joint; the main controller is connected with the A/D module, the storage module, the function key, the display module, the communication module and the power supply module, and the function key comprises a key 1, a key 2 and a key 3;
the multi-way joint is a four-way joint, the pressure sensor is arranged at the four-way joint, the other joint of the four-way joint is connected with an adjusting mechanism, the adjusting mechanism comprises an outer cylinder, a piston plate, a threaded rod, a push rod and a spring, the piston plate is arranged in the outer cylinder in a sliding manner, at least two sealing rings are arranged between the piston plate and the outer cylinder, and a multiple sealing structure is formed through the sealing rings; one end of the outer cylinder is connected with the four-way joint, the other end of the outer cylinder is closed and provided with a threaded hole, the threaded rod is matched with the threaded hole, the push rod is positioned in the outer cylinder, the lower end of the push rod is in threaded connection with the threaded rod, the piston plate is provided with a bulge, the end part of the bulge is provided with a round hole, the side surface of the bulge is provided with a guide groove communicated with the round hole, the upper end of the push rod is provided with a mounting hole, the upper end of the push rod extends into the round hole, a limiting pin is arranged in the mounting hole, the limiting pin penetrates through the guide groove, the spring is positioned in the outer cylinder, the upper end of the spring is in contact with the piston plate, and the lower end of the spring is in contact with the end part of the outer cylinder;
the high-pressure hose is also connected with a drain valve;
forming a detection and buffer mechanism at the four-way joint;
through the guide groove, the piston plate is in a movable state in the outer cylinder, but under the limiting action of the limiting pin, the piston plate can only move on a preset stroke, when high-pressure gas enters, the piston plate moves at the moment, the purpose of buffering is realized under the action of a spring, the impact on the buried ball valve inner leakage detection device is avoided, the possibility of leakage of the buried ball valve inner leakage detection device is reduced, and the accuracy of a detection result is ensured;
before testing, after the drain valve and the stop valve are closed, the piston plate is driven to move by rotating the screw rod, so that the internal pressure of the buried ball valve internal leakage detection device is adjusted, the tightness of the buried ball valve internal leakage detection device is detected, and the detection efficiency is improved without external connection or additional airtight detection mechanisms.
2. The buried ball valve internal leakage detection device according to claim 1, wherein: the main controller is an STM32F103RBT6 processor, and the main controller collects valve cavity pressure signals through the pressure sensor and controls the A/D module to be used for converting analog signals into digital signals.
3. The buried ball valve internal leakage detection device according to claim 2, wherein: the storage module is an SD card, the main controller stores the valve cavity pressure digital signal data converted by the A/D module through the control storage module for further analysis and processing, and a plurality of storage units are created for each storage, so that the data stored each time are ensured not to be interfered.
4. A buried ball valve internal leakage detection apparatus according to claim 3, wherein: the key 1 is a power switch button, the key 2 is a buried earth valve internal leakage detection start/stop button, and the key 3 is a sampling frequency parameter setting button.
5. The buried ball valve internal leakage detection device according to claim 4, wherein: the display module is an LCD display screen, and the display screen displays the valve cavity pressure of the buried earth valve.
6. The buried ball valve internal leakage detection device according to claim 5, wherein: the communication module is a ZigBee module, the main controller can remotely communicate with the upper computer through the control communication module, the upper computer can remotely set sampling frequency parameters and control the buried ball valve internal leakage detection device to start/stop detection, and the buried ball valve cavity pressure signal is transmitted to the upper computer for monitoring in real time, so that pressure data can be stored, and historical data can be checked.
7. The buried ball valve internal leakage detection apparatus according to any one of claims 1 to 6, wherein: the power supply module comprises a 24V lithium battery and an electric quantity display meter, and is used for respectively supplying power to the main controller, the display screen and the pressure sensor after the lithium battery is depressurized, displaying the electric quantity of a power supply in real time and giving an early warning of low electric quantity.
8. The buried ball valve internal leakage detection method is characterized by comprising the following steps of: the buried ball valve internal leakage detection device disclosed in claim 6 is adopted for detection, and the specific detection method is as follows:
s1: the ball valve to be detected is completely closed, a high-pressure hose of the detection device is connected with a drain outlet of the buried earth valve to be detected, a stop valve of the detection device is closed, a power supply of the detection device is turned on by pressing a key 1, a display screen of the detection device displays real-time pressure of a valve cavity of the buried earth valve, the drain valve of the ball valve to be detected is turned on, and the detection device is connected with the valve cavity of the ball valve; slowly opening a check valve of the detection device, decompressing the valve cavity to be lower than the pipeline running pressure, decompressing to the target pressure, and closing the check valve of the detection device;
s2: pressing the key 2 to start the internal leakage detection of the buried ball valve, if the key 2 is pressed again to stop the internal leakage detection of the buried ball valve, if the key 2 is not pressed, the detection device automatically collects pressure data for 10 minutes according to the set frequency, and remotely transmits a pressure signal of a valve cavity of the buried ball valve to an upper computer in real time to monitor pressure change; automatically storing the pressure data into the SD card after the detection is finished;
s3: judging whether internal leakage occurs or not through whether the pressure of the earth-buried valve cavity changes or not, when the pressure of the earth-buried valve cavity changes, denoising the collected pressure change data of the earth-buried valve cavity through a wavelet threshold value and detecting an abnormal value, calculating a pressure difference after data processing, and if the pressure difference is continuously increased, the internal leakage occurs, otherwise, the internal leakage does not occur.
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