CN111473927B - Natural gas rapid pressure measurement leak detection device and leak detection method - Google Patents
Natural gas rapid pressure measurement leak detection device and leak detection method Download PDFInfo
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- CN111473927B CN111473927B CN202010281423.0A CN202010281423A CN111473927B CN 111473927 B CN111473927 B CN 111473927B CN 202010281423 A CN202010281423 A CN 202010281423A CN 111473927 B CN111473927 B CN 111473927B
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01M3/2807—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 pipes
- G01M3/2815—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 pipes using pressure measurements
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Abstract
The invention relates to a natural gas rapid pressure-measuring leakage-detecting device and a leakage-detecting method, wherein the leakage-detecting device comprises a gas pipeline, an opening and closing valve for opening and closing the gas pipeline is arranged on the gas pipeline, the gas pipeline is communicated with a three-way pipe, one pipe orifice of the three-way pipe is a pressure-measuring pipe orifice, the pressure-measuring pipe orifice is provided with a check valve for opening and closing the pressure-measuring pipe orifice and a plug for plugging the pressure-measuring pipe orifice, the plug is provided with a threaded hole which penetrates from the outer surface to the inner surface of the plug, with screw hole screw-thread fit's screw thread push rod, the orificial tip screw thread cover of pressure measurement is equipped with the screw thread plug, and the screw thread plug is at the other end intercommunication of being connected with the pressure measurement mouth of pipe has the pressure measuring table, thereby is provided with along with the screw thread plug in the pressure measurement mouth of pipe radial movement screw blade of moving the screw thread push rod at end cap axial displacement, and the valve rod that the screw thread push rod promoted on the check valve removes, opens the pressure measurement mouth of pipe, and the check valve has and makes check valve elasticity reset in order to seal the orificial elastic component of pressure measurement. The method realizes quick leak detection, has high efficiency and convenience, and saves resources.
Description
Technical Field
The invention relates to the technical field of natural gas leakage detection, in particular to a natural gas rapid pressure measurement leakage detection device and a leakage detection method.
Background
Natural gas is widely used in life and industrial production of people as a high-quality energy source, but natural gas is inflammable, explosive and easy to diffuse, and leakage and rupture accidents of natural gas pipelines not only cause great economic loss, but also easily cause personal injury, environmental pollution and other consequences, so that online detection of leakage of the natural gas pipelines is very important for timely finding leakage and preventing leakage hidden dangers.
At present, in the prior art, in a chinese patent document with an authorization publication number of CN206248296U, a pressure detector for gas tightness of a gas meter ball valve is described, which includes a base, a pressure gauge, a connection pipe plug, a pressure detection end and a detection chamber, the connection pipe plug is connected to the pressure detection end, the pressure detection end is connected to the base, the pressure gauge is installed on an air inlet hose, the hose is connected to the connection pipe plug in a sealing manner, the pressure detection end includes a push rod device sliding due to the action of gas pressure, a pressure scale for displaying pressure values, a U-shaped pipe for fixing the connection pipe plug, and a spring, the detection chamber is connected to the base, the detection chamber and the connection pipe plug are respectively connected to two ends of the ball valve in a sealing manner, and the ball valve is supported and fixed by the base.
The above prior art solutions have the following drawbacks: such pressure measurement should all install such pressure measurement on each solitary gas pipeline, just can carry out the leak hunting to every gas pipeline, if do not install such pressure measurement then can't leak hunting, and this kind of pressure measurement is all installed to each, can lead to the cost to rise, is unsuitable to be widely used.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the natural gas rapid pressure measurement and leakage detection equipment which is high in detection efficiency, does not need to be provided with a detection instrument on each gas pipeline, and has the advantages of high efficiency and low cost.
The first invention of the present invention is realized by the following technical solutions:
a natural gas rapid pressure measuring and leakage detecting device comprises a gas pipeline, an opening and closing valve for opening and closing the gas pipeline is arranged on the gas pipeline, the gas pipeline is communicated with a three-way pipe, one pipe orifice of the three-way pipe is a pressure measuring pipe orifice, the pressure measuring pipe orifice is provided with a check valve for opening and closing the pressure measuring pipe orifice and a plug for plugging the pressure measuring pipe orifice, the plug is provided with a threaded hole which penetrates from the outer surface to the inner surface of the plug and a threaded push rod which is in threaded fit with the threaded hole, a threaded plug is sleeved on the end part of the pressure measuring pipe orifice in a threaded manner, the other end of the threaded plug, which is connected with the pressure measuring pipe orifice, is communicated with a pressure measuring meter, a screw blade which moves along with the radial movement of the threaded plug at the pressure measuring pipe orifice so as to screw the threaded push rod to move axially at the plug head is arranged in the threaded plug, the threaded push rod pushes a valve stem on a check valve to move, opening a pressure tap, the check valve having an elastic member elastically restoring the check valve to close the pressure tap.
Through adopting above-mentioned technical scheme, check valve and end cap play the effect of dual shutoff to the pressure measurement mouth of pipe, utilize quick plug to link together the pressure measurement mouth of pipe and pressure-measuring meter, along with twisting the quick plug, drive the screw push rod and remove, thereby with the check valve back-up, the pressure measurement mouth of pipe is opened, if there is gas leakage in the gas pipeline, then from the pressure measurement mouth of pipe, the screw plug enters into in the pressure-measuring meter, the pressure-measuring meter is according to fluidic flow, measure fluid pressure change, thereby it has gas leakage to detect out, adopt plug and the pressure-measuring meter of inserting soon, detection efficiency is high, and need not all install the instrument that detects on each gas pipeline, and is high-efficient, low-cost advantage.
The present invention in a preferred example may be further configured to: the threaded push rod is provided with a flow channel for gas to flow, the gas inlet of the flow channel is arranged on the circumferential side face of one end, close to the check valve, of the threaded push rod, and the gas outlet of the flow channel is arranged on the end face, back to the check valve, of one end of the threaded push rod.
Through adopting above-mentioned technical scheme, set up flow channel on the screw thread push rod, in the gas of being convenient for enters into quick plug through flow channel, make fluidic flow more smooth and easy, the mobile efficient is convenient for obtain the detection effect fast.
The present invention in a preferred example may be further configured to: and the inner wall of the pressure measuring pipe orifice is provided with a deformation elastic sheet which elastically pushes against the end part of one end of the threaded push rod facing the check valve and applies elastic force along the axial direction of the threaded push rod to one end of the threaded push rod.
Through adopting above-mentioned technical scheme, deformation shell fragment is to an axial elasticity of screw thread push rod, makes the screw thread push rod reset more atress, twists and moves the screw thread push rod, and elasticity multiplicable its and the threaded hole inner wall frictional force between is given to the elasticity shell fragment, and the screw thread push rod is difficult for skidding in the threaded hole, and the effect of twisting and moving the motion of screw thread push rod can be better.
The present invention in a preferred example may be further configured to: the device comprises a plug, a threaded push rod, a miniature bearing and a contact plate, wherein a protruding shaft protruding out of the inner surface of the plug is fixedly arranged at one end of the threaded push rod, the miniature bearing is sleeved on the protruding shaft, and the contact plate is fixedly arranged on the outer ring surface of the miniature bearing and is abutted to one end of a deformation elastic sheet.
Through adopting above-mentioned technical scheme, conflict between conflict board and the deformation shell fragment, miniature bearing's setting makes the screw thread push rod normally carry out the helical motion, and the deformation shell fragment only does elastic deformation in the axial of screw thread push rod, makes the deformation of deformation shell fragment not disturbed, normal use.
The present invention in a preferred example may be further configured to: the protruding shaft is sleeved with a first sealing ring used for sealing a gap between the threaded hole and the threaded push rod, and the first sealing ring is located between the miniature bearing and the plug.
Through adopting above-mentioned technical scheme, first sealing washer prevents that gaseous gap between screw thread push rod and the screw hole from leaking away, further strengthens the leakproofness of pressure measurement mouth of pipe tip, improves the precision of leak hunting.
The present invention in a preferred example may be further configured to: the outer end face of the threaded push rod is provided with a first cutter groove matched with the screwdriver blade in an inserted mode.
Through adopting above-mentioned technical scheme, twist and move the screw thread plug, drive the screwdriver blade and rotate, drive the screw thread push rod through first sword groove and rotate on the end cap, when realizing the installation screw thread plug, also open the screw hole on the end cap, make the efficiency of test higher to use with quick plug cooperation in the leak hunting, just can open the screw hole on the end cap.
The present invention in a preferred example may be further configured to: the outer surface of the plug is provided with a second cutter groove communicated with the first cutter groove, the second cutter groove is positioned at two ends of the first cutter groove, and the groove widths of the first cutter groove and the second cutter groove are equal.
Through adopting above-mentioned technical scheme, the adaptation screwdrivers utensil of being convenient for is opened the end cap rotation in the setting of second sword groove, and opening or closing of end cap is easier, laborsaving.
The present invention in a preferred example may be further configured to: the inner hole wall of the threaded plug is provided with an internal thread and a second sealing ring, the outer circumferential surface of the pressure measuring pipe orifice is provided with an external thread matched with the internal thread in a threaded manner, and the second sealing ring is in sealing fit with the edge of the outer end surface of the pressure measuring pipe orifice so as to seal a gap between the pressure measuring pipe orifice and the threaded plug.
Through adopting above-mentioned technical scheme, the clearance between second sealing washer sealed threaded plug and the pressure measuring pipe mouth outward flange has further strengthened the leakproofness between threaded plug and the pressure measuring pipe mouth, is favorable to obtaining more accurate leak hunting result.
The second purpose of the invention is to provide a method for detecting the natural gas by measuring the pressure and leakage rapidly, which is more efficient, convenient and low in cost, and the detection equipment is easy to disassemble and assemble and can be used anytime and anywhere.
The second object of the present invention is achieved by the following technical solutions:
a method for detecting leakage of natural gas by rapid pressure measurement is characterized in that: the gas pipeline leakage condition is detected by using the natural gas rapid pressure measurement leakage detection equipment, and the leakage detection method comprises the following steps:
(1) installing a threaded push rod on a threaded hole of the plug, plugging a pressure measuring pipe orifice by the plug, installing a threaded plug communicated with a pressure measuring meter on the pressure measuring pipe orifice during leak detection, installing the threaded plug and the pressure measuring pipe orifice in a threaded manner, moving the threaded plug to be close to a check valve along with the radial direction of the pressure measuring pipe orifice, continuously moving the threaded push rod screwed on the threaded plug to the inside of the pressure measuring pipe orifice, enabling the threaded push rod to be abutted against a valve rod on the check valve, and jacking the check valve to open the pressure measuring pipe orifice;
(2) the gas pipeline is internally provided with airflow which enters a pressure gauge from a pressure measuring pipe orifice, a threaded push rod and a threaded plug, the pressure gauge detects the change of pressure, the gas pipeline is detected to have the gas leakage condition, and if no airflow enters the pressure gauge in the gas pipeline and the pressure on the pressure gauge is not changed, the gas pipeline is detected to have no gas leakage condition;
(3) the back that finishes, slowly spin off the threaded plug from the pressure measuring pipe orifice, the in-process of revolving, the screwdriver blade drives the screw thread push rod and moves outside to the pressure measuring pipe orifice, and the elastic component drives the check valve and moves to pressure measuring pipe orifice outside direction, carries out elasticity and resets, makes the sealed pressure measuring pipe orifice of check valve, and after the screw thread push rod resets, the pressure measuring pipe orifice is further sealed to screw thread push rod and end cap.
Through adopting above-mentioned technical scheme, install threaded plug on the pressure measurement mouth of pipe, realize quick leak hunting, and when the threaded plug installation, open the pressure measurement mouth of pipe, efficiency is higher, can tear down after having detected, the pressure measurement mouth of pipe is closed again, uses pressure gauge and threaded plug on other gas pipelines that have the pressure measurement mouth of pipe, also can directly use, and unusual convenience is used manpower sparingly, material resources and financial resources.
In conclusion, the beneficial technical effects of the invention are as follows: .
1. The gas pipeline leakage detection device has the advantages that the rapid leakage detection is realized, the detection efficiency is high, the gas pipeline leakage detection device can be detached after detection is finished, the pressure measuring pipe orifice is closed again, and the pressure measuring meter and the threaded plug can be directly used when being used on other gas pipelines with pressure measuring pipe orifices, so that the gas pipeline leakage detection device is very convenient and saves manpower, material resources and financial resources;
2. due to the multiple sealing design, the tightness between the pressure gauge and the pressure measuring pipe orifice is stronger, and a more accurate pressure measuring and leakage detecting result is obtained;
3. due to the design of the cutter groove, the plug and the threaded push rod can be conveniently disassembled and assembled, and the labor is saved and the operation is fast.
Drawings
FIG. 1 is a schematic structural diagram of a gas pipeline and a gas meter according to the present invention, which is used for showing the installation position of a pressure measuring pipe orifice;
FIG. 2 is an exploded view of a pressure tube orifice for embodying the mounting relationship between a threaded plug and the pressure tube orifice in accordance with the present invention;
FIG. 3 is a schematic cross-sectional view of a pressure tap of the present invention for embodying an internal mounting configuration of the pressure tap;
fig. 4 is an enlarged view of part a of fig. 3, showing the components on the stopper.
In the figure, 1, a gas pipeline; 1.1, a first pipeline; 1.2, a second pipeline; 1.3, a three-way pipe; 2. opening and closing a valve; 3. a gas meter; 4. a pressure measuring pipe orifice; 4.1, a first round hole part; 4.2, a second round hole part; 4.3, a circular table part; 4.4, a third round hole part; 5. a check valve; 5.1, a valve rod; 5.2, a first sealing element; 5.3, a bearing ring body; 5.4, an elastic piece; 5.5, a valve body; 6. a plug; 6.1, a threaded hole; 6.2, a threaded push rod; 6.3, a first channel; 6.4, a second channel; 6.5, a flow channel; 6.6, a protruding shaft; 6.7, a micro bearing; 6.8, a collision plate; 6.9, deforming the elastic sheet; 6.10, a first knife groove; 6.11, a second knife groove; 7. a screwdriver blade; 8. a threaded plug; 9. a second seal ring; 10. a third seal.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows: referring to fig. 1, the natural gas rapid pressure measurement leak detection apparatus disclosed by the invention comprises a gas pipeline 1, the gas pipeline 1 comprises a first pipeline 1.1 and a second pipeline 1.2, a gas meter 3 is communicated with a gas outlet end of the first pipeline 1.1, the gas outlet end of the gas meter 3 is communicated with a gas inlet end of the second pipeline 1.2, the first pipeline 1.1 is communicated with the second pipeline 1.2 through the gas meter 3, the gas meter 3 is used for detecting the flow of natural gas in the gas pipeline 1, an opening and closing valve 2 for opening or closing the gas pipeline is arranged on the first pipeline 1.1, and the opening and closing valve 2 is a ball valve.
Referring to fig. 1 and 3, the second pipeline 1.2 is communicated with a three-way pipe 1.3, one pipe orifice of the three-way pipe 1.3 is a pressure measuring pipe orifice 4, fig. 1 shows an installation position of the pressure measuring pipe orifice 4, the pressure measuring pipe orifice 4 comprises a first round hole portion 4.1, a second round hole portion 4.2, a round table portion 4.3 and a third round hole portion 4.4 which are sequentially arranged from outside to inside, the first round hole portion 4.1, the second round hole portion 4.2, the round table portion 4.3 and the third round hole portion 4.4 are coaxially arranged and are communicated with each other, the first round hole portion 4.1 and the third round hole portion 4.4 have the same diameter and are larger than the second round hole portion 4.2, the first round hole portion 4.1 and the second round hole portion 4.2 are in step transition, the cross section of the round table portion 4.3 is in a shape, and the inner diameter of one end, close to the second round hole portion 4.2, of the round table portion 4.3 is smaller than the inner diameter of the other end.
Referring to fig. 2 and 3, a check valve 5 for opening and closing the pressure measuring pipe orifice 4 is arranged on the pressure measuring pipe orifice 4, the check valve 5 is located in a third circular hole portion 4.4, the check valve 5 comprises a valve body, a valve rod 5.1 fixed at one end of the valve body and an elastic piece 5.4, the valve body 5.5 and the valve rod 5.1 extend into a first circular hole portion 4.1 from the third circular hole portion 4.4, a first sealing piece 5.2 is fixedly embedded in the position, close to the circular table portion 4.3, of the valve body 5.5, the first sealing piece 5.2 is a first sealing ring, the first sealing ring is of a 0 type, a circle extends in the circumferential direction of the valve body 5.5, and the first sealing ring is abutted to the inner wall of the circular table portion 4.3 and used for sealing a gap between the pressure measuring pipe orifice 4 and the valve body 5.5. A bearing ring body 5.3 is coaxially fixed in the third circular hole part 4.4, an elastic part 5.4 is arranged between the bearing ring body 5.3 and the valve body 5.5, the bearing ring body 5.3 is in a circular ring shape, the elastic part 5.4 comprises a spring, one end of the spring is fixedly connected with one end of the valve body 5.5, which is back to the valve rod 5.1, the other end of the spring is fixedly connected with the surface of the bearing ring body 5.3, the valve body 5.5 axially moves in the third circular hole part 4.4, the corresponding spring elastically stretches, when the pressure measuring pipe orifice 4 is in a closed state, the first sealing ring is abutted against the inner wall of the circular table part 4.3 to seal a gap between the pressure measuring pipe orifice 4 and the valve body 5.5, when the pressure measuring pipe orifice 4 is in an opened state, the valve body 5.5 moves to the first circular hole part 4.1 far away from the pressure measuring pipe orifice 4, and the spring is in a compressed state.
Referring to fig. 3 and 4, an outer tube opening of the pressure measuring tube opening 4 is provided with a plug 6 for plugging the pressure measuring tube opening 4, the plug 6 is cylindrical, the plug 6 is provided with a threaded hole 6.1 penetrating from the outer surface of the plug 6 to the inner surface of the plug 6, the threaded push rod 6.2 is in threaded fit with the threaded hole 6.1, the threaded push rod 6.2 is cylindrical, an external thread is arranged on the threaded push rod 6.2, an internal thread in threaded fit with the external thread is arranged in the threaded hole 6.1, a protruding shaft 6.6 is coaxially fixed at one end of the threaded push rod 6.2 opposite to the outer end of the pressure measuring tube opening 4, the protruding shaft 6.6 protrudes out of the inner surface of the plug 6, a miniature bearing 6.7 is fixedly arranged on the protruding shaft 6.6, a contact plate 6.8 is fixedly arranged on the outer ring surface of the miniature bearing 6.7, the contact plate 6.8 is annular, and extends and is arranged along the circumferential direction of the miniature bearing 6.7. The protruding shaft 6.6 is provided with a third sealing element 10, the third sealing element 10 comprises an O-shaped third sealing ring, the third sealing ring is fixedly sleeved on the protruding shaft 6.6 and is located between the miniature bearing 6.7 and the inner surface of the plug 6, and the third sealing ring is used for sealing a gap between the threaded hole 6.1 and the threaded push rod 6.2.
Referring to fig. 3 and 4, a flow channel 6.5 for flowing gas is arranged on the threaded push rod 6.2, the flow channel 6.5 includes a first channel 6.3 extending along the radial direction of the threaded push rod 6.2, and a second channel 6.4 extending along the axial direction of the threaded push rod 6.2, the first channel 6.3 and the second channel 6.4 are communicated with each other, one end of the first channel 6.3 is arranged on the circumferential side surface of the threaded push rod 6.2 close to one end of the check valve 5, and the end port is an air inlet of the flow channel 6.5, the other end port of the second channel 6.4 communicated with the first channel 6.3 penetrates through to one end surface of the threaded push rod 6.2, which is opposite to the check valve 5, and the end port is an air outlet of the flow channel 6.5.
Referring to fig. 3 and 4, pressure measurement mouth of pipe 4 is inside to be provided with deformation shell fragment 6.9, deformation shell fragment 6.9's shape is the arc, the middle part sets up to pressure measurement mouth of pipe 4's inner wall direction protrusion, deformation shell fragment 6.9's one end is fixed in on the step face between first round hole portion 4.1 and the second round hole portion 4.2, the other end contradicts towards check valve 5's one end terminal surface elasticity with conflict board 6.8, deformation shell fragment 6.9 applys elastic support power to conflict board 6.8, along with screw push rod 6.2 is inside to pressure measurement mouth of pipe 4 to be removed, conflict board 6.8 also removes in pressure measurement mouth of pipe 4, conflict board 6.8 promotes deformation shell fragment 6.9 and carries out elastic bending.
Referring to fig. 3 and 4, a first knife groove 6.10 is formed in the outer end face of the threaded push rod 6.2, the first knife groove 6.10 extends along the radial direction of the threaded push rod 6.2, the first knife groove 6.10 penetrates through the outer edge of the threaded push rod 6.2, a second knife groove 6.11 is formed in the outer surface of the plug 6, the second knife groove 6.11 is located at two ends of the first knife groove 6.10 and communicated with the first knife groove 6.10, and the groove widths of the first knife groove 6.10 and the second knife groove 6.11 are equal.
Referring to fig. 3 and 4, the outer end of the pressure measuring pipe orifice 4 is sleeved with a threaded plug 8, the threaded plug 8 is hollow and tubular, the inner circumferential surface of the threaded plug 8 is provided with internal threads, the outer circumferential surface of the pressure measuring pipe orifice 4 is provided with external threads arranged along the axial direction of the pressure measuring pipe orifice 4, the internal threads are matched with the external threads, the threaded plug 8 is in threaded fit with the pressure measuring pipe orifice 4, the other end of the threaded plug 8 connected with the pressure measuring pipe orifice 4 is communicated with a hose (not shown in the figure) and is connected with a pressure measuring meter (not shown in the figure) through the hose, a screwdriver blade 7 is arranged in the threaded plug 8, the screwdriver blade 7 is flat, a space for gas to enter the hose is reserved between the screwdriver blade 7 and the port of the end of the hose connected with the threaded plug 8, one end is fixed on the port of the end of the hose connected with the threaded plug 8, and the other end extends along the radial direction of the threaded plug 8, and the end part is inserted and matched with the first knife slot 6.10 on the threaded push rod 6.2, the threaded plug 8 is sleeved on the pressure measuring pipe orifice 4 in advance, the screwdriver blade 7 is opposite to and inserted with the first knife slot 6.10, and along with the threaded tightening of the threaded plug 8 on the pressure measuring pipe orifice 4, the screwdriver blade 7 drives the threaded push rod 6.2 to rotate through the first knife slot 6.10, and the movement of the threaded plug 8 drives the threaded push rod 6.2 to move towards the direction of the check valve 5.
Referring to fig. 3, a second seal ring 9 is fixedly arranged on the inner wall of the threaded plug 8, the second seal ring 9 extends along the axial direction of the threaded plug 8, and the second seal ring 9 abuts against the outer edge of the end portion of the pressure measuring pipe orifice 4 and is used for sealing a gap between the threaded plug 8 and the pressure measuring pipe orifice 4.
The implementation principle of the embodiment is as follows: the gas pipeline 1 is closed, the pressure measuring pipe orifice 4 is plugged through the plug 6 and the check valve 5, the threaded plug 8 is pre-inserted into the pressure measuring pipe orifice 4, the screwdriver blade 7 is opposite to the first knife slot 6.10, one end of the screwdriver blade is in plug-in fit with the first knife slot 6.10, the threaded plug 8 is screwed, the screwdriver blade 7 is driven by the threaded plug 8 to rotate the first knife slot 6.10, so that the threaded push rod 6.2 is driven to rotate, the threaded push rod 6.2 moves towards the direction close to the check valve 5, one end close to the check valve 5 is abutted against the valve rod 5.1 of the check valve 5, the valve rod 5.1 is driven to move along with the continuous movement of the threaded push rod 6.2, so that the sealing between the check valve 5 and the inner wall of the pressure measuring pipe orifice 4 is opened, the pressure measuring pipe orifice 4 is communicated with the inside of the gas pipeline 1, and if leakage occurs in the gas pipeline 1, the leaked gas passes through the third round hole part 4.4.3, the round table part 4.2, The first round hole part 4.1 enters the flow channel 6.5, enters the threaded plug 8 from the air outlet and enters the pressure gauge through the threaded plug 8, the pressure gauge measures pressure change according to flow change of flowing natural gas, and reading on the pressure gauge changes, so that the situation that the gas pipeline 1 leaks is indicated; if no gas enters the pressure gauge through the pressure measuring pipe orifice 4, the condition of the gas pipeline 1 is normal and no leakage occurs.
Example two: in order to detect the leakage of the natural gas by rapid pressure measurement, the first embodiment of the invention is used for detecting the leakage condition of the gas pipeline, and the leakage detection method comprises the following steps:
(1) installing a threaded push rod 6.2 on a threaded hole 6.1 of a plug 6, plugging a pressure measuring pipe orifice 4 by the plug 6 and a check valve 5, enabling a gas pipeline 1 to be in a closed state, installing a threaded plug 8 communicated with a pressure measuring meter on the pressure measuring pipe orifice 4 during leak detection, enabling a screwdriver blade 7 on the threaded plug 8 to be opposite to and in plug-in fit with a first knife slot 6.10, screwing the threaded plug 8, driving the threaded push rod 6.2 to approach the check valve 5, enabling one end of the threaded push rod 6.2 to abut against a valve rod 5.1 on the check valve 5, and ejecting the check valve 5 to open the pressure measuring pipe orifice 4;
(2) the gas pipeline is internally provided with air flow which enters a pressure measuring meter from a pressure measuring pipe orifice 4, a flow channel 6.5 on a threaded push rod 6.2 and a threaded plug 8, the pressure measuring meter detects the change of pressure, the condition of gas leakage of the gas pipeline is detected, and if no air flow enters the pressure measuring meter in the gas pipeline and the pressure on the pressure measuring meter is not changed, the condition of gas leakage of the gas pipeline is detected;
(3) after finishing the detection, slowly spin off threaded plug 8 from pressure measuring pipe orifice 4, the in-process of revolving, screwdriver blade 7 drives threaded push rod 6.2 and removes outside pressure measuring pipe orifice 4, and elastic component 5.4 drives check valve 5 and removes to 4 foreign directions of pressure measuring pipe orifice, carries out elasticity and resets, makes the sealed pressure measuring pipe orifice 4 of check valve 5, and threaded push rod 6.2 resets the back, and threaded push rod 6.2 and end cap 6 further seal pressure measuring pipe orifice 4.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (6)
1. The utility model provides a natural gas quick pressure measurement leak hunting equipment, includes gas pipeline (1), be provided with on gas pipeline (1) and open and close valve (2) of opening and close gas pipeline (1), its characterized in that: the gas pipeline (1) is communicated with a three-way pipe (1.3), one pipe orifice of the three-way pipe (1.3) is a pressure measuring pipe orifice (4), the pressure measuring pipe orifice (4) is provided with a check valve (5) for opening and closing the pressure measuring pipe orifice (4) and a plug (6) for plugging the pressure measuring pipe orifice (4), the plug (6) is provided with a threaded hole (6.1) which penetrates from the outer surface to the inner surface of the plug (6) and a threaded push rod (6.2) in threaded fit with the threaded hole (6.1), the end part of the pressure measuring pipe orifice (4) is provided with a threaded plug (8) in a threaded sleeve manner, the threaded plug (8) is communicated with a pressure measuring meter at the other end connected with the pressure measuring pipe orifice (4), and a screw blade (7) which moves along with the threaded plug (8) in the pressure measuring pipe orifice (4) in the radial direction so as to screw the threaded push rod (6.2) to move in the axial direction of the plug (6) is arranged in the threaded plug (8), the threaded push rod (6.2) pushes a valve rod (5.1) on the check valve (5) to move, the pressure measuring pipe orifice (4) is opened, and the check valve (5) is provided with an elastic piece (5.4) which enables the check valve (5) to elastically reset so as to close the pressure measuring pipe orifice (4); a flow channel (6.5) for gas to flow is arranged on the threaded push rod (6.2), a gas inlet of the flow channel (6.5) is arranged on the circumferential side surface of one end, close to the check valve (5), of the threaded push rod (6.2), and a gas outlet of the flow channel (6.5) is arranged on the end surface of one end, opposite to the check valve (5), of the threaded push rod (6.2); the pressure measuring pipe orifice (4) inner wall be provided with screw thread push rod (6.2) are contradicted towards the one end tip elasticity of check valve (5) and are applyed deformation shell fragment (6.9) along screw thread push rod (6.2) axial elasticity to screw thread push rod (6.2) one end, the fixed protruding axle (6.6) that is provided with protrusion in end cap (6) internal surface of one end of screw thread push rod (6.2), the cover is equipped with miniature bearing (6.7) on protruding axle (6.6), the outer lane face of miniature bearing (6.7) is fixed and is provided with the inconsistent touch panel (6.8) that supports with the one end of deformation shell fragment (6.9), elastic deformation is done in the axial of screw thread push rod (6.2) to deformation shell fragment (6.9).
2. The apparatus of claim 1 for rapid pressure and leak detection of natural gas, wherein: the protruding shaft (6.6) is sleeved with a third sealing ring used for sealing a gap between the threaded hole (6.1) and the threaded push rod (6.2), and the third sealing ring is located between the miniature bearing (6.7) and the plug (6).
3. The apparatus of claim 1 for rapid pressure and leak detection of natural gas, wherein: the outer end face of the threaded push rod (6.2) is provided with a first cutter groove (6.10) which is in plug-in fit with the screwdriver blade (7).
4. The rapid natural gas pressure and leakage detecting device according to claim 3, characterized in that: the outer surface of the plug (6) is provided with a second knife groove (6.11) communicated with the first knife groove (6.10), the second knife groove (6.11) is positioned at two ends of the first knife groove (6.10), and the groove widths of the first knife groove (6.10) and the second knife groove (6.11) are equal.
5. The apparatus of claim 1 for rapid pressure and leak detection of natural gas, wherein: be provided with internal thread and second sealing washer (9) on the interior pore wall of screw plug (8), be provided with on the outer periphery of pressure measurement mouth of pipe (4) with internal thread screw-thread fit's external screw thread, second sealing washer (9) with the outer terminal surface edge sealing laminating of pressure measurement mouth of pipe (4) is in order to seal the gap between pressure measurement mouth of pipe (4) and screw plug (8).
6. A method for detecting leakage of natural gas by rapid pressure measurement is characterized in that: the gas pipeline (1) leakage condition is detected by using the natural gas rapid pressure detecting and leakage detecting device as claimed in claim 1, and the leakage detecting method comprises the following steps:
(1) installing a threaded push rod (6.2) on a threaded hole (6.1) of a plug (6), plugging a pressure measuring pipe orifice (4) by the plug (6), installing a threaded plug (8) communicated with a pressure measuring meter on the pressure measuring pipe orifice (4) during leak detection, installing the threaded plug (8) and the pressure measuring pipe orifice (4) in a threaded manner, moving the threaded plug (8) on the pressure measuring pipe orifice (4) in a radial direction close to a check valve (5), continuously moving a screwing threaded push rod (6.2) on the threaded plug (8) to the inside of the pressure measuring pipe orifice (4), abutting the threaded push rod (6.2) against a valve rod (5.1) on the check valve (5), and ejecting the check valve (5) to open the pressure measuring pipe orifice (4);
(2) the gas pipeline is internally provided with air flow which enters a pressure measuring meter from a pressure measuring pipe orifice (4), a threaded push rod (6.2) and a threaded plug (8), the pressure measuring meter detects the change of pressure, the condition of gas leakage of the gas pipeline is detected, and if no air flow enters the pressure measuring meter and the pressure on the pressure measuring meter is not changed, the condition of gas leakage of the gas pipeline is detected;
(3) after finishing the detection, slowly revolve down from pressure measuring pipe orifice (4) with threaded plug (8), the in-process of revolving, screwdriver blade (7) drive screw push rod (6.2) and move outward to pressure measuring pipe orifice (4), elastic component (5.4) drive check valve (5) and move to pressure measuring pipe orifice (4) outer side, carry out elasticity and reset, make check valve (5) seal pressure measuring pipe orifice (4), screw push rod (6.2) restore to the throne the back, screw push rod (6.2) and end cap (6) further seal pressure measuring pipe orifice (4).
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