CN116972244A - Gas pipeline connecting device and gas pipeline leakage detection device - Google Patents

Gas pipeline connecting device and gas pipeline leakage detection device Download PDF

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Publication number
CN116972244A
CN116972244A CN202310990027.9A CN202310990027A CN116972244A CN 116972244 A CN116972244 A CN 116972244A CN 202310990027 A CN202310990027 A CN 202310990027A CN 116972244 A CN116972244 A CN 116972244A
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CN
China
Prior art keywords
flange
gas
sealing
current
processor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310990027.9A
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Chinese (zh)
Inventor
田静
魏戬
刘彩红
孙晓跃
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Civil Aviation University of China
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Civil Aviation University of China
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Publication date
Application filed by Civil Aviation University of China filed Critical Civil Aviation University of China
Priority to CN202310990027.9A priority Critical patent/CN116972244A/en
Publication of CN116972244A publication Critical patent/CN116972244A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/032—Flanged joints the flanges being connected by members tensioned axially characterised by the shape or composition of the flanges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/16—Flanged joints characterised by the sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The application relates to the technical field of gas pipeline connection, and discloses a gas pipeline connection device, which comprises: the first flange is arranged on the first pipeline; the second flange is arranged on the second pipeline, is connected with the first flange in a sealing way through a fastener and forms a flange plate, and a notch is formed at the edge of the flange plate; and the first clamping ring is respectively and hermetically connected with the first flange and the second flange, and the first clamping ring seals the notch to form a sealing cavity. The first flange and the second flange are in sealing connection through a fastener, so that a first sealing structure can be formed; the first clamping ring is respectively in sealing connection with the first flange and the second flange, and the first clamping ring seals the notch to form a sealing cavity, so that a second sealing structure can be formed under the condition that the first sealing structure fails. Therefore, the first pipeline and the second pipeline are connected and sealed through the first sealing structure and the second sealing structure, and the sealing effect is good.

Description

Gas pipeline connecting device and gas pipeline leakage detection device
Technical Field
The application relates to the technical field of gas pipeline connection, in particular to a gas pipeline connection device and a gas pipeline leakage detection device.
Background
Some gases, such as natural gas, leak when passing through the pipeline, explosion and fire can occur when exposed fire, static electricity and the like, and if the ventilation effect is poor, people can be anoxic, choked and even dead, and immeasurable losses are brought to the safe production and life and property of units.
In the related prior art, flange connection pipelines are mostly adopted, and if the sealing performance is poor, gas leakage is easy to occur through flange connection.
Disclosure of Invention
In view of the above, the present application provides a gas pipe connection device to solve the sealing problem of gas pipe connection.
In a first aspect, the present application provides a gas conduit connection device comprising: the first flange is arranged on the first pipeline; the second flange is arranged on the second pipeline, is in sealing connection with the first flange through a fastener and forms a flange plate, and a notch is formed at the edge of the flange plate; and the first clamping ring is respectively and hermetically connected with the first flange and the second flange, and the first clamping ring seals the notch to form a sealing cavity.
In an alternative embodiment, the fastener includes a sealing bolt having an annular groove formed thereon for mounting the first seal ring.
In an alternative embodiment, the end surfaces of the first flange and the second flange opposite to each other are provided with concave-convex matching structures, and the matching positions of the concave-convex matching structures are provided with inner transverse gaskets.
In an optional implementation manner, the first flange and the second flange are respectively provided with a first clamping groove and a second clamping groove on end faces deviating from each other, the first clamping grooves and the second clamping grooves are respectively arranged in a circumferential direction, the first clamping ring comprises a first bending part and a second bending part which are symmetrically arranged, the first bending part is clamped with the first clamping grooves, and the second bending part is clamped with the second bending part.
In a second aspect, the present application provides a gas pipeline leakage detection device comprising: an electric box; an electrical system comprising a current generating assembly disposed within a sealed cavity of the gas conduit connection device of any one of claims 1 to 8, a current detecting assembly electrically connected to the current generating assembly for detecting a current generated by the current generating assembly, and an alarm module connected to the current detecting assembly for emitting an alarm signal when the current is detected.
In an alternative embodiment, the current detection assembly comprises a resistor, a current circuit that reacts to the leaking gas, a Wheatstone bridge, and a current detector adapted to detect the current generated within the Wheatstone bridge.
In an alternative embodiment, the alarm module includes: an a/D converter adapted to convert the electrical signal into a data signal; the processor is in communication connection with the A/D converter; the switch is arranged on the circuit and is connected with the processor; and the timer is in communication connection with the processor to record the gas leakage time, and the processor is suitable for controlling the switch to trip according to the data signal to alarm.
In an alternative embodiment, the alarm module further comprises a signal lamp, the signal lamp is in communication connection with the processor, and the processor controls the signal lamp to give an alarm according to the data signal.
In an alternative embodiment, the gas pipeline leakage detection device further comprises an ambient temperature sensing element, wherein the ambient temperature sensing element forms a voltage division circuit, and the voltage division circuit is in communication connection with the processor to calculate the ambient temperature, and the processor is used for performing ambient temperature compensation correction.
In an alternative embodiment, the gas pipeline leakage detection device further comprises an ambient air pressure sensing element and a conditioning circuit, wherein the ambient air pressure sensing element is in communication connection with the processor, and the processor is suitable for controlling the ambient air pressure sensing element to perform air pressure detection and performing ambient air pressure compensation correction through the processor.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a partially cut-away perspective view of a gas conduit connection device according to an embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of a gas conduit connection device according to an embodiment of the present application;
FIG. 3 is a schematic cross-sectional view of another gas conduit connection device according to an embodiment of the present application;
FIG. 4 is a schematic front view of a sealing bolt of a gas pipeline connecting device according to an embodiment of the present application;
FIG. 5 is a schematic perspective view of a gas pipe connection device according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a gas pipeline leakage detection device according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a temperature detecting and compensating circuit of a leakage detecting device for a gas pipeline according to an embodiment of the present application;
fig. 8 is a schematic diagram of a gas pressure detection and altitude compensation circuit of a gas pipeline leakage detection device according to an embodiment of the present application.
Reference numerals illustrate:
1. a first flange; 2. a second flange; 3. a nut; 4. a gasket; 5. a sealing bolt; 6. a first ring half; 7. a second ring half; 8. a resistor; 9. an annular groove; 10. a first seal ring; 11. a dehumidifier; 12. an outer cross pad; 13. a third seal ring; 14. an inner cross pad; 15. a second seal ring; 16. a wire connector; 17. a first half stud; 18. a second half stud; 19. a lock nut; 20. connecting pipe; 21. a red alarm lamp; 22. a green alarm lamp; 23. a wire; 24. an electric box; 25. and a power supply line.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Summary of the application
Currently, combustion type leak detectors using platinum flakes as a catalyst are commonly used for detection at gas pipeline sealing interfaces. The detection element of this type is mainly a sheet platinum wire which is relatively stable in chemical properties in air. Conventional supported catalytic gas-sensitive sensor elements consist of Al doped with noble-metal catalysts platinum or palladium 2 O 3 A platinum wire coil in the porous ceramic body. Adopts the principle of contact combustion. The temperature of the platinum wire is increased to 400 ℃ after the platinum wire is electrified, and when the catalyst and CH 4 When in contact, under the action of the catalyst, CH 4 Flame-free combustion with oxygen in the air occurs to raise the temperature of the coil, the resistance of the platinum wire increases, and the resistivity 8 changes. At this time, the resistance change can be converted into the voltage change by matching with the detection bridge circuit, so that the measurement of the overflow concentration of the combustible gas is realized. The measuring mode has the advantages of being visual, convenient and fast, and can be manufactured into a handheld gas detector for manually measuring whether gas leaks or not in a short time.
Considering actual environmental conditions, the gas pipeline needs to be deeply buried under the ground or placed on a carrying platform higher from the ground due to different external environmental factors. The safety supervision personnel holds the gas detector and seals the detection to gas transportation pipeline and have a great deal of inconvenience even some regions can't carry out manual detection. Meanwhile, most of the gas leakage detecting instruments sold in the market at present are used for monitoring whether gas leakage occurs at the flange joint of the gas pipeline, and cannot provide a measurement index for the service effect and service life of the flange sealing device (the sealing device is considered to be invalid when the leakage rate is high), and the leakage detecting errors under different environment temperatures and different altitudes are large. Therefore, the gas pipeline sealing performance testing device under the service state of the real environment has the following defects:
(1) The sealing performance detection device for the area which cannot be involved in manual detection is not developed at present;
(2) The service effect and service life of the flange sealing device cannot be provided with a measurement index.
(3) The method provides a solution for the problem that after the gas transmission pipeline leaks, the gas transmission pipeline cannot be maintained in time due to the laying condition or other sudden problems.
(4) The gas leakage detection error under different temperature environments is larger, and even misjudgment is caused.
(5) The gas leakage detection error is larger under different altitudes, and even misjudgment is caused.
Therefore, the application aims to improve the gas leakage detection device designed by the former so that the gas leakage detection device can calculate a sealing performance detection device which takes the leakage rate as a measurement index and can be hung on the outer wall of a pipeline through measuring certain parameter indexes.
Embodiments of the present application are described below with reference to fig. 1 to 8.
As shown in fig. 1 and 2, according to an aspect of the present application, there is provided a gas pipe connection device including: the flange comprises a first flange 1, a second flange 2 and a first clamping ring, wherein the first flange 1 is arranged on a first pipeline, the second flange 2 is arranged on a second pipeline, the second flange 2 and the first flange 1 are connected in a sealing way through a fastener to form a flange plate, and a notch is formed at the edge of the flange plate; the first clamping ring is respectively and hermetically connected with the first flange 1 and the second flange 2, and the first clamping ring seals the notch to form a sealing cavity.
The first pipe and the second pipe are connected to form a connection pipe 20, and the gas can be fuel gas.
The gas conduit connection means may be suspended from the outer wall of the conduit. The first flange 1 and the second flange 2 are respectively provided with mounting holes matched with the first pipeline and the second pipeline, the first flange 1 and the second flange 2 can be connected around the mounting holes by a plurality of fasteners, and the fasteners can be uniformly distributed, so that the first flange 1 and the second flange 2 are uniformly stressed, and gas leakage is reduced.
The first flange 1 and the second flange 2 are in sealing connection through the fastening pieces, so that gas leakage between the fastening pieces and the first flange 1 and the second flange 2 can be avoided, and a first sealing structure can be formed. The first clamping ring is respectively connected with the first flange 1 and the second flange 2 in a sealing way, and the first clamping ring seals the notch to form a sealing cavity, so that the leaked gas enters the sealing cavity under the condition that the first sealing structure fails, and a second sealing structure can be formed. Therefore, the first pipeline and the second pipeline are connected and sealed through the first sealing structure and the second sealing structure, and the sealing effect is good.
Further, as shown in fig. 3 and 4, the fastening member includes a sealing bolt 5, and an annular groove is provided on the sealing bolt 5 to mount a first seal ring 10, thereby achieving sealing between the fastening member and the first flange 1 and the second flange 2. The fastener also comprises a gasket 4 and a nut 3, and is used for locking the connection of the sealing bolt 5 and the first flange 1 and the second flange 2, so that the sealing effect is further improved.
In another embodiment, the opposite end surfaces of the first flange 1 and the second flange 2 are provided with concave-convex matching structures, and the matching parts of the concave-convex matching structures are provided with inner transverse pads 14.
Wherein, be equipped with the recess on the terminal surface of first flange 1 towards second flange 2, be equipped with protruding structure on the terminal surface of second flange 2 towards first flange 1, on protruding structure's terminal surface can be located to interior cross-pad 14, protruding structure can be the cylinder, and the recess can be the blind hole. When the first flange 1 is connected with the second flange 2, the protruding structure extends into the groove, and the inner transverse pad 14 can be tightly matched with the bottom wall of the groove, so that the sealing effect is further optimized.
In another embodiment, the end faces of the first flange 1 and the second flange 2, which are away from each other, are respectively provided with a first clamping groove and a second clamping groove, the first clamping grooves and the second clamping grooves are respectively arranged in a circumferential direction, the first clamping ring comprises a first bending part and a second bending part which are symmetrically arranged, the first bending part is clamped with the first clamping grooves, and the second bending part is clamped with the second bending part.
Specifically, the first draw-in groove and second draw-in groove encircle sealing bolt 5 respectively and set up, and first flange 1 deviates from on the terminal surface of second flange 2, second draw-in groove are located on the terminal surface of second flange 2 deviating from first flange 1, and first draw-in groove and second draw-in groove are the ring channel respectively, and first snap ring wholly is tubular structure, and first kink and the second kink of first snap ring respectively include first riser, bottom plate and second riser, and the first riser of first kink is the tube-shape to encircle the lateral wall setting of first flange 1, and the first riser of second kink is the tube-shape equally, in order to encircle the lateral wall setting of second flange 2. The bottom plate butt of first kink is on the terminal surface that first flange 1 deviates from second flange 2, and the bottom plate butt of second kink is on the terminal surface that second flange 2 deviates from first flange 1. The second vertical plate of the first bending part is clung to the side wall of the first clamping groove, and the second vertical plate of the second bending part is clung to the side wall of the second clamping groove.
More specifically, the first snap ring includes: the first ring half 6 and the second ring half 7, first ring half 6 is equipped with first bulge and first kink, and first kink and first flange 1 sealing connection, second ring half 7 is equipped with second bulge and second kink, and second kink and second flange 2 sealing connection, and second bulge and first bulge sealing connection.
It can be understood that the first clamping ring is arranged in a split mode, so that the first clamping ring is conveniently clamped in the first clamping groove and the second clamping groove, and a sealing cavity is formed. The first projection and the second projection are disposed around the flange. Specifically, the first protruding portion and the second protruding portion may have plate-like structures, respectively, so as to more conveniently form a sealed connection.
In order to achieve better sealing effect between the first clamping ring and the first flange 1 and the second flange 2, a second sealing ring 15 capable of encircling the connecting pipe 20 is arranged on the contact surface between the first bending part and the first flange 1, a third sealing ring 13 capable of encircling the connecting pipe 20 is arranged on the contact surface between the first protruding part and the second protruding part, and grooves are arranged on the matching surface between the first protruding part and the second protruding part so as to install the outer transverse cushion 12.
The first bending part and the second bending part respectively realize press fit with the first flange 1 and the second flange 2 through corresponding bottoms, annular grooves are formed in the first flange 1 and the second flange 2, and the second sealing ring 15 is arranged in each groove. The surface of the first protruding part facing the second protruding part is provided with an annular groove, and the third sealing ring 13 is arranged in the groove. And the contact surfaces of the first bulge and the second bulge, which are close to the sealing cavity, are respectively provided with an inner clamping groove for installing the outer transverse cushion 12, so that one side of the outer transverse cushion 12 is inserted into the first bulge, and the other side of the outer transverse cushion 12 is inserted into the second bulge, thereby realizing better sealing effect.
In another embodiment, the gas pipeline connecting device further comprises a second clamping ring, the second clamping ring covers and locks the first protruding portion and the second protruding portion, so that locking and fixing between the first protruding portion and the second protruding portion can be further achieved, and sealing effects between the first clamping ring and the first flange 1 and between the first clamping ring and the second flange 2 are enhanced.
Specifically, the second snap ring includes: the first half ring is provided with a first half screw rod, and the second half ring is provided with a second half screw rod; the first half screw and the second half screw form a screw structure, and the screw structure is locked by a locking nut 19.
The first semi-ring and the second semi-ring respectively comprise a bottom plate and a vertical plate, the bottom plate of the first semi-ring is in compression fit with the first protruding portion, and the bottom plate of the second semi-ring is in compression fit with the second protruding portion. The riser of first semi-ring can be laminated with the lateral surface of first bulge, and the riser of second semi-ring can be laminated with the lateral surface of second bulge. The first half screw is arranged on the first half ring, the second half screw is arranged on the second half ring, when the first half ring and the second half ring are mutually pressed, the first half screw and the second half screw form a screw structure, then are locked through the locking nut 19, and the locking nut 19 is a fastening snap ring cap, so that the first protruding part and the second protruding part can be locked, that is, the first snap ring can be firmly fixed on the first flange 1 and the second flange 2.
The outer edge of the flange plate is fastened through the first ring half body 6 and the second ring half body 7, and the first clamping ring is clamped through the fastening clamping ring cap, so that the purpose of secondary sealing is achieved.
According to an embodiment of the present application, in another aspect, there is also provided a gas pipe leakage detecting apparatus including: the electric box 24 and the electric system, the electric system includes electric current production subassembly, electric current detection subassembly and alarm module, and electric current production subassembly is located gas piping connection device's sealed intracavity, and electric current production subassembly is suitable for producing electric current when gas leakage to sealed chamber, electric current detection subassembly and electric current production subassembly electric connection to detect electric current that electric current production subassembly produced, alarm module is connected with electric current detection subassembly, in order to send alarm signal when detecting electric current.
Specifically, the electrical box 24 may be connected to a power cord 25, and the electrical box 24 may be provided with a lead 23, the electrical box 24 may be provided on the adapter 20, the current generating assembly is provided in the sealed cavity, the current detecting assembly is provided in the electrical box 24, and the alarm module may be provided on the electrical box 24. The current generating component reacts with the leaked gas, so that current can be generated, and the current is detected by the current detecting component, so that the leakage quantity of the gas can be represented. When the current is detected, the gas leakage in the sealing cavity is indicated, so that the alarm module is used for alarming, and corresponding measures can be taken in time to avoid secondary disasters or dangers caused by the gas leakage.
Wherein, be equipped with wire connector 16 on gas piping connection device's the first snap ring, wire connector 16 stretches into sealed intracavity, and wire connector 16 sets up the tetrafluoro packing ring in the inside of wire connector 16, and the wire connector 16 passes through wire 23 and electric current production subassembly and electric current detection subassembly electric connection.
Specifically, one end of the wire connector 16 is fixed on the outer wall of the single clamping ring through external threads, a tetrafluoro gasket is placed in the wire connector 16, the connector is arranged at the innermost part of the tetrafluoro gasket, and the connecting assembly is fastened with the connector.
In another embodiment, a current generating assembly includes: a dehumidifier 11 and a resistor 8, the dehumidifier 11 being adapted to adsorb moisture in the gas; the resistor 8 is electrically connected to the dehumidifier 11, and the resistor 8 reacts with the gas to change the resistor 8 to generate current.
Specifically, the dehumidifier 11 is made of a water absorbing material such as silica gel, so as to absorb gas and water in the cavity, the resistor 8 can be a platinum resistor, the platinum resistor is mainly made of platinum, when the circuit is a passage, the adjustable resistor is adjusted, no current passes through the current detection assembly, i.e. no leakage exists between the connection of the first flange 1 and the second flange 2. When the circuit system is in a non-passage way, the dehumidifier 11 and the platinum sheet resistor are arranged in the sealing cavity, the platinum sheet acts as a catalyst to react with natural gas, so that the resistor 8 is changed, and at the moment, the current flows through the current detector.
The dehumidification sheet 11 and the platinum sheet resistor are connected to an electrical system in an electrical box 24 through a wire 23, and the wire 23 is connected to the outside of the chamber through a wire connector 16.
Specifically, as shown in fig. 6, the current detection assembly includes: a resistor 8, a current circuit that reacts to the leaking gas, a wheatstone bridge and a current detector adapted to detect the current generated in the wheatstone bridge.
The wheatstone bridge is also called a single-arm bridge, and is an instrument capable of accurately measuring resistance. The general wheatstone bridge resistors R1, R2, R3, R4 are called four arms of the bridge, G is a current detector for detecting whether current exists in the branch where it is located.
When the circuit is in a passage, the adjustable resistor is adjusted, no current passes through the current detector, tripping of the air switch does not occur, and a green light in the alarm lamp is lighted, namely, no leakage exists between the connection of the first flange 1 and the second flange 2. When the circuitry is non-pass, the platinum sheet acts as a catalyst to react with the natural gas, thereby changing the resistance 8, and the current detector passes current.
In another embodiment, continuing with FIG. 6, the alarm module comprises: the device comprises an A/D converter, a processor, a switch and a timer, wherein the A/D converter is suitable for converting an electric signal into a data signal, the timer is in communication connection with the processor to record gas leakage time, the processor is in communication connection with the A/D converter, the switch is arranged on a circuit, the switch is connected with the processor, and the processor is suitable for controlling the switch to trip to alarm according to the data signal.
The processor comprises a singlechip. The current is converted into data through the A/D converter and is transmitted to the singlechip, and the singlechip controls the switch to trip, and the switch can be an air switch.
Specifically, when the current is converted into data through the A/D converter and is transmitted to the singlechip, the air switch trips, and the timer starts to count the leakage time, so that a guarantee is provided for further taking corresponding measures.
In another embodiment, as shown in fig. 1, the alarm module further comprises a signal lamp, the signal lamp is in communication connection with the processor, and the processor controls the signal lamp to give an alarm according to the data signal.
Specifically, the current converts the electric signal into data through the A/D converter and transmits the data to the singlechip, the air switch trips, the timer starts to count the leakage time, and meanwhile, the red alarm lamp 21 in the signal lamp is lightened, and meanwhile, the alarm alarms.
Through the luminous alarm of alarm lamp after detecting gas leakage, record the gas and begin leakage time and carry out secondary seal to the pipeline, namely gas pipeline leakage detection device. The device can hang on the outer cylinder wall of the pipeline through the connecting pipe, so that the area which cannot be related by manpower can be detected.
In another embodiment, as shown in fig. 7, the gas pipeline leakage detection device further comprises an ambient temperature sensing element, the ambient temperature sensing element forms a voltage dividing circuit, and the voltage dividing circuit is in communication connection with the processor to calculate the ambient temperature, and the processor performs ambient temperature compensation correction.
According to the environment temperature sensing element, the sampling resistor of the 10k omega NTC and the pulled-up precise resistor of the 10k omega 1% form the voltage dividing circuit, the NTC end is connected with the 0.1 mu F capacitor in parallel to remove interference, and the voltage dividing voltage is acquired through the singlechip, so that the environment temperature is calculated, and temperature compensation is provided for gas leakage detection. And the temperature compensation correction is carried out by the processor, so that the leak detection precision is improved.
In another embodiment, as shown in fig. 8, the gas pipeline leakage detection device further comprises an ambient air pressure sensing element and a conditioning circuit, wherein the ambient air pressure sensing element is in communication connection with the processor, and the processor is adapted to control the ambient air pressure sensing element to perform air pressure detection alone and perform ambient air pressure compensation correction through the processor.
According to the environmental air pressure sensing element, the MS5611 barometer is adopted, the singlechip is communicated with the MS5611 through the IIC bus, the MS5611 is controlled to perform air pressure detection, and the detection precision can be improved, so that the altitude of the leakage testing device is determined, and altitude compensation is provided for gas leakage detection.
In another embodiment, as shown in fig. 1 and 5, a gas pipeline leakage detection sealing performance testing device comprises a first flange 1, a second flange 2, a first ring half 6, a second ring half 7, a lock nut 19, a connecting pipe 20, a wire connector 16, an electric box 24, a sealing element, an induction element and an electric system. The device hangs on the pipeline outer wall, wherein, is connected through sealing bolt 5 and gasket 4 between first flange 1 and the second flange 2, and the double-screw bolt both ends of sealing bolt 5 wherein all are equipped with annular groove 9, and annular groove 9 cooperates first sealing washer 10 to form sealedly. The first ring half 6 and the second ring half 7 fasten the outer edge of the flange, and the first ring half 6 and the second ring half 7 are clamped by an upper stud 17 and a lower stud 18 and fixed by a lock nut 19. The purpose of preventing leakage can be realized. The connection tube 20 is communicated with the flange inner cavity through the wire connector 16, and an electric box 24 for placing an electric system is arranged on the connection tube 20.
The sealing element comprises an inner transverse gasket 14, a second sealing ring 15, an outer transverse gasket 12 and a third sealing ring 13, wherein the inner transverse gasket 14, the second sealing ring 15, the outer transverse gasket 12 and the third sealing ring 13 can be made of rubber. The inner cross-pad 14 is installed in the flange near the adapter 20 to seal the fuel gas and prevent the fuel gas from leaking to the outside of the flange. The second sealing ring 15 is arranged at the contact place of the flange plate and the first clamping ring, so that the gas is prevented from continuing to leak from the inner side of the first clamping ring after leaking. The outer transverse pad 12 and the third sealing ring 13 are arranged on the outer side of the clamping ring, so that the gas is prevented from continuing to leak from the outer side of the first clamping ring after the gas leaks.
An electrical system is placed in the electrical box 24, the electrical system comprising: dehumidifier 11, resistance 8, platinum sheet resistance, adjustable resistance, current detector, AD converter, singlechip, air switch, time-recorder, alarm lamp, data acquisition ware. In the electrical system, when the circuit is a passage, the adjustable resistor is adjusted, no current passes through the current detector, no tripping occurs on the air switch, and the green alarm lamp 22 in the alarm lamp is lightened, namely no leakage exists between the flange connections. When the circuit system is a non-passage, the dehumidifier 11 and the platinum sheet resistor are placed in the cavities of the flange and the clamping ring, the dehumidifier 11 is made of a water absorbing material such as silica gel and is used for absorbing gas moisture in the cavities, the platinum sheet resistor is mainly made of platinum sheets, and the platinum sheets are used as catalysts to react with natural gas, so that the resistor 8 is changed, and current passes through the current detector. The current is converted into data through the A/D converter and is transmitted to the singlechip, the air switch trips, the timer starts to count the leakage time, and the red alarm lamp 21 in the alarm lamp is lightened and the alarm is given out.
The underground gas pipeline leakage detection device provided by the application is simple in laying, convenient in equipment installation, convenient in maintenance and low in cost. This underground gas pipeline leak hunting device can detect the region that the manual work can not be involved, carries out secondary seal when in time effectively finding the gas pipeline leakage condition to record the time of beginning to leak, calculate sealing performance with the leak rate as the measurement index through measuring the size of electric current. The gas pipeline detection is more convenient, the workload of maintenance workers is reduced, the service cycle of the transmission pipeline is prolonged, and the occurrence rate of safety accidents is reduced.
Although embodiments of the present application have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the application, and such modifications and variations fall within the scope of the application as defined by the appended claims.

Claims (10)

1. A gas pipeline connection device, comprising:
the first flange (1) is arranged on the first pipeline;
the second flange (2) is arranged on the second pipeline, is connected with the first flange (1) in a sealing way through a fastener and forms a flange plate, and a notch is formed at the edge of the flange plate;
the first clamping ring is in sealing connection with the first flange (1) and the second flange (2) respectively, and the notch is blocked by the first clamping ring to form a sealing cavity.
2. A gas pipe connection according to claim 1, characterized in that the fastening means comprise a sealing bolt (5), which sealing bolt (5) is provided with an annular groove (9) for mounting a first sealing ring (10).
3. A gas conduit connection according to claim 1, wherein the end face of the first flange (1) opposite to the second flange (2) is provided with a male-female mating structure, and the mating part of the male-female mating structure is provided with an inner cross-pad (14).
4. A gas pipe connection device according to any one of claims 1 to 3, wherein the first flange (1) and the second flange (2) are provided with a first clamping groove and a second clamping groove respectively on end faces facing away from each other, the first clamping groove and the second clamping groove are respectively arranged in a circumferential direction, the first clamping ring comprises a first bending part and a second bending part which are symmetrically arranged, the first bending part is clamped with the first clamping groove, and the second bending part is clamped with the second bending part.
5. A gas pipeline leak detection apparatus, comprising:
an electrical box (24);
a gas leakage detection system device comprising a current generating assembly, a current detecting assembly and an alarm module, wherein the current generating assembly is arranged in a sealing cavity of the gas pipeline connecting device according to any one of claims 1 to 8, the current generating assembly is suitable for generating current when gas leaks into the sealing cavity, the current detecting assembly is electrically connected with the current generating assembly so as to detect current generated by the current generating assembly, and the alarm module is connected with the current detecting assembly so as to send an alarm signal when the current is detected.
6. The gas conduit leak detection apparatus of claim 5, wherein the current generating assembly comprises a resistor, a current circuit that reacts to the leaking gas, a wheatstone bridge, and a current detector adapted to detect a current generated within the wheatstone bridge.
7. The gas conduit leak detection apparatus of claim 5, wherein the alarm module comprises:
an a/D converter adapted to convert the electrical signal into a data signal;
the processor is in communication connection with the A/D converter;
the timer is in communication connection with the processor to record gas leakage time;
and the switch is arranged on the circuit and is connected with the processor, and the processor is suitable for controlling the switch to trip according to the data signal so as to alarm.
8. The gas conduit leak detection apparatus of claim 7, wherein the alarm module further comprises a signal light in communication with the processor, the processor controlling the signal light to sound an alarm based on the data signal.
9. The gas line leak detection apparatus of claim 7, further comprising an ambient temperature sensing element, the ambient temperature sensing element comprising a voltage divider circuit communicatively coupled to the processor for detecting an ambient temperature and performing an ambient temperature compensation correction by the processor.
10. The gas line leak detection apparatus of claim 7, further comprising an ambient air pressure sensing element and a conditioning circuit, the ambient air pressure sensing element being coupled to the processor, the processor being adapted to control the ambient air pressure sensing element to detect air pressure and to perform ambient air pressure compensation correction by the processor.
CN202310990027.9A 2023-08-08 2023-08-08 Gas pipeline connecting device and gas pipeline leakage detection device Pending CN116972244A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310990027.9A CN116972244A (en) 2023-08-08 2023-08-08 Gas pipeline connecting device and gas pipeline leakage detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310990027.9A CN116972244A (en) 2023-08-08 2023-08-08 Gas pipeline connecting device and gas pipeline leakage detection device

Publications (1)

Publication Number Publication Date
CN116972244A true CN116972244A (en) 2023-10-31

Family

ID=88484821

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310990027.9A Pending CN116972244A (en) 2023-08-08 2023-08-08 Gas pipeline connecting device and gas pipeline leakage detection device

Country Status (1)

Country Link
CN (1) CN116972244A (en)

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