Efficient natural gas smelting furnace matched pipe joint device with self-sealing function

Abstract

The invention discloses an efficient natural gas smelting furnace matched pipe joint device with a self-sealing function, and relates to the technical field of natural gas pipe joints. An efficient natural gas smelter matched pipe joint device with a self-sealing function comprises an L-shaped main pipe, a buffer sealing pipe fixedly installed in the main pipe, and a self-sealing pipe, the two ends of the main pipe are connected with a fuel gas pipeline and a smelter pipeline through two sets of connecting flanges respectively, and the buffer sealing pipe is fixedly installed in the main pipe. Pressure fluctuation is formed through the gradual change hole structure, the buffering sealing pipe is expanded through the high-pressure section, the pressing force between the buffering sealing pipe and the inner wall of the main pipe is enhanced, the self-sealing effect is improved while the self-sealing device adapts to the pressure fluctuation or vibration working condition, and the leakage risk is reduced; local resistance is further reduced through the arc-shaped expansion holes, the conveying efficiency is improved, the piston mechanism is driven through natural gas pressure changes, impurities are alternately collected and discharged through valve element switching, and external energy is not needed.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas pipe joints, and specifically relates to a pipe joint device for a high-efficiency natural gas melting furnace with a self-sealing function. Background Art

[0002] When producing zinc-aluminum alloy using a high-efficiency regenerative energy-saving and environmental-friendly natural gas melting furnace, an L-shaped pipe joint is required to connect the furnace intake pipeline and the natural gas transmission pipeline to complete gas transmission.

[0003] Currently, traditional pipe joints usually adopt flange connection with static sealing rings. However, under high pressure, temperature fluctuations or mechanical vibration conditions, the risk of leakage is increased due to the aging of the sealing ring, thermal expansion and contraction or pressure fluctuations. In addition, natural gas often contains solid impurities (such as dust and rust particles). If they accumulate in the pipeline for a long time, they may block the valve, corrode the pipe wall, and even cause equipment failures. In view of the above problems, a pipe joint device for a high-efficiency natural gas melting furnace with a self-sealing function is proposed herein. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a pipe joint device for a high-efficiency natural gas melting furnace with a self-sealing function that can overcome or at least partially solve the above problems.

[0005] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0006] A pipe joint device for a high-efficiency natural gas melting furnace with a self-sealing function includes an L-shaped main pipe. Both ends of the main pipe are connected to a gas pipeline and a furnace pipeline respectively through two groups of connecting flanges. It further includes: a buffer sealing pipe fixedly installed inside the main pipe, both ends of the buffer sealing pipe extend into the gas pipeline and the furnace pipeline respectively. The inner hole of the buffer sealing pipe is provided with a first tapered hole and a second tapered hole. When natural gas passes through the first tapered hole and the second tapered hole, the pressure of the natural gas first increases and then decreases. A discharge pipe is fixedly installed at the bottom of the intersection of the elbow and the horizontal straight pipe of the main pipe, and a discharge valve is fixedly installed at the bottom of the discharge pipe. When natural gas passes through the first tapered hole, the elastic deformation of the buffer sealing pipe caused by the pressure change of the natural gas combines with a hydraulic drive assembly to drive the valve core of the discharge valve to change position and discharge the impurities contained in the natural gas inside the pipe joint.

[0007] As a preferred embodiment of the present invention: the main pipe and the connecting flanges at both ends are integrally formed, and the connecting flanges on the main pipe and the flanges on the gas pipeline and the furnace pipeline are all connected by bolts, and a sealing ring is provided between the connecting flange and the flange.

[0008] As a preferred embodiment of the present invention: both the first tapered hole and the second tapered hole are funnel-shaped holes that are wide at both ends and narrow in the middle. The first tapered hole and the second tapered hole are connected through an expansion hole, and the ends of the contraction regions of the first tapered hole and the second tapered hole are respectively aligned with the sealing rings at both ends.

[0009] As a preferred embodiment of the present invention: an annular card slot is provided on the outer wall of the buffer sealing tube, and a snap ring that engages with the card slot is provided on the inner wall of the main pipe.

[0010] As a preferred embodiment of the present invention: an installation cavity is provided inside the buffer sealing tube, a buffer pad is provided inside the installation cavity, and absorption holes are provided on the buffer pad.

[0011] As a preferred embodiment of the present invention: the discharge valve includes a valve body fixedly installed at the bottom of the discharge pipe. A first discharge hole and a second discharge hole are provided at the bottom of the valve body. A valve core is slidably arranged inside the valve body, and a first collection hole and a second collection hole are provided on the valve core.

[0012] As a preferred embodiment of the present invention: a sealing capsule is provided inside the buffer pad, a flowing medium is filled inside the sealing capsule, a piston tube is fixedly installed at the bottom of the main pipe, the piston tube is communicated with the sealing capsule through a connecting pipe, a piston plate is slidably installed inside the piston tube, the piston plate is connected to the valve core through a piston rod, a spring is sleeved on the piston rod, and both ends of the spring are respectively in abutting connection with the piston plate and the piston tube.

[0013] As a preferred embodiment of the present invention: an installation ring is fixedly installed on the inner wall of the buffer sealing tube, an annular groove is provided between the installation ring and the inner wall of the buffer sealing tube, an elastic member is fixedly installed inside the annular groove, and a filter screen is fixedly installed at the top of the elastic member.

[0014] As a preferred embodiment of the present invention: a sliding rod is slidably installed on the filter screen, a blocking ball is fixedly installed at the top of the sliding rod, the sliding rod extends below the filter screen and a limiting plate is fixedly installed, and the blocking ball is arranged above the second tapered hole.

[0015] As a preferred embodiment of the present invention: a flapping plate is fixedly installed on the sliding rod, and the flapping plate is arranged above the filter screen.

[0016] After adopting the above technical solutions, the present invention has the following beneficial effects compared with the prior art: The present invention forms pressure fluctuations through the gradient hole structure, uses the high-pressure section to expand and buffer the sealing tube, enhances the pressing force between the buffer sealing tube and the inner wall of the main pipe, adapts to pressure fluctuations or vibration conditions while improving the self-sealing effect, reduces the leakage risk, and the design with wide ends and narrow middle of the gradient holes can reduce turbulence and energy loss. The arc-shaped expansion holes further reduce the local resistance, improve the conveying efficiency, and use the change of natural gas pressure to drive the piston mechanism, and realize the alternate collection and discharge of impurities through the switching of the valve core without external energy.

[0017] The following further describes in detail the specific implementation manners of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the drawings:

[0019] Figure 1 is a three-dimensional structural schematic diagram of a pipe joint device supporting a highly efficient natural gas furnace with a self-sealing function proposed by the present invention;

[0020] Figure 2 is a three-dimensional cross-section of a pipe joint device supporting a highly efficient natural gas furnace with a self-sealing function proposed by the present invention Figure 1 ;

[0021] Figure 3 is a pipe joint device supporting a highly efficient natural gas furnace with a self-sealing function proposed by the present invention Figure 2 structural schematic diagram at A in;

[0022] Figure 4 is a cross-sectional view of the discharge valve of a pipe joint device supporting a highly efficient natural gas furnace with a self-sealing function proposed by the present invention;

[0023] Figure 5 is a three-dimensional cross-section of a pipe joint device supporting a highly efficient natural gas furnace with a self-sealing function proposed by the present invention Figure 2 ;

[0024] Figure 6 is a pipe joint device supporting a highly efficient natural gas furnace with a self-sealing function proposed by the present invention Figure 5 structural schematic diagram at B in;

[0025] Figure 7 is a pipe joint device supporting a highly efficient natural gas furnace with a self-sealing function proposed by the present invention Figure 5 structural schematic diagram at C in;

[0026] Figure 8 is a cross-sectional view of the buffer sealing tube of a pipe joint device supporting a highly efficient natural gas furnace with a self-sealing function proposed by the present invention;

[0027] Figure 9 For a pipe joint device supporting an efficient natural gas furnace with a self-sealing function proposed by the present invention Figure 8 The structural schematic diagram at D in

[0028] Figure 10 The sectional view of the plugging ball of a pipe joint device supporting an efficient natural gas furnace with a self-sealing function proposed by the present invention.

[0029] In the figure: 1, main pipe; 11, connecting flange; 12, snap ring; 13, sealing ring; 2, buffer sealing pipe; 21, installation cavity; 22, clamping groove; 23, first tapered hole; 24, second tapered hole; 25, annular groove; 26, installation ring; 3, buffer pad; 31, absorption hole; 4, elastic member; 41, filter net; 5, plugging ball; 51, sliding rod; 52, flapping plate; 53, limiting plate; 6, discharge pipe; 61, valve body; 62, first discharge hole; 63, second discharge hole; 64, valve core; 641, first collection hole; 642, second collection hole; 7, sealing capsule; 71, connecting pipe; 72, piston pipe; 73, piston rod; 74, piston plate; 75, spring. Specific embodiments

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but not to limit the scope of the present invention.

[0031] Embodiment: Refer to Figures 1 - 9, A high-efficiency natural gas furnace supporting pipe joint device with a self-sealing function, including an L-shaped main pipe 1. The main pipe 1 is integrally formed with connecting flanges 11 at both ends. The connecting flanges 11 on the main pipe 1 are bolted to the flanges on the gas pipeline and the furnace pipeline. A sealing ring 13 is provided between the connecting flange 11 and the flange. It also includes: A buffer sealing pipe 2 fixedly installed inside the main pipe 1. Both ends of the buffer sealing pipe 2 extend into the gas pipeline and the furnace pipeline respectively. The inner hole of the buffer sealing pipe 2 is provided with a first tapered hole 23 and a second tapered hole 24. Both the first tapered hole 23 and the second tapered hole 24 are funnel-shaped holes that are wide at both ends and narrow in the middle. The first tapered hole 23 and the second tapered hole 24 are connected through an expansion hole (the expansion hole has the same maximum diameter as the first tapered hole 23 and the second tapered hole 24, and the tapered hole is a 90° arc-shaped bent hole). The ends of the contraction zones of the first tapered hole 23 and the second tapered hole 24 are aligned with the sealing rings 13 at both ends respectively. When natural gas passes through the first tapered hole 23 and the second tapered hole 24, the pressure of the natural gas first increases and then decreases. At the bottom of the junction of the bent pipe and the horizontal straight pipe of the main pipe 1, a discharge pipe 6 is fixedly installed. A discharge valve is fixedly installed at the bottom of the discharge pipe 6. When natural gas passes through the first tapered hole 23, the elastic deformation of the buffer sealing pipe 2 caused by the change in natural gas pressure, combined with the hydraulic drive assembly, drives the valve core 64 of the discharge valve to change positions to discharge the impurities contained in the natural gas inside the pipe joint.

[0032] When the pipe joint is in use, natural gas with a standard pressure in the industrial natural gas pipeline first enters the inner hole of the buffer sealing pipe 2 through the first tapered hole 23. During this process, the natural gas with a standard pressure first enters the expansion hole through the first tapered hole 23, and then is discharged through the second tapered hole 24. During this process, the pressure of the natural gas with a standard pressure first increases and then decreases and enters the expansion hole, and then when it is discharged from the expansion hole to the inside of the furnace pipeline, the pressure of the natural gas will first increase and then decrease again, and finally decrease to the standard pressure in the industrial natural gas pipeline.

[0033] In summary, when natural gas passes through the first tapered hole 23 and the second tapered hole 24, pressure fluctuations (increasing first and then decreasing) are formed due to the change in cross-sectional area. The high-pressure section pushes the buffer seal tube 2 to expand outward, dynamically enhancing the pressing force between the buffer seal tube 2 and the flange contact surface, forming an adaptive sealing effect. This design is particularly suitable for high-pressure or pressure fluctuation working conditions, and can reduce the risk of seal failure caused by vibration or thermal expansion and contraction. In addition, the sealing ring 13 serves as a static seal, while the elastic deformation of the buffer seal tube 2 provides dynamic compensation. The combination of the two can significantly reduce the leakage probability of natural gas. Moreover, the expansion deformation of the buffer seal tube 2 in the high-pressure section (the end of the contraction zone) not only enhances the pressing force of the sealing ring 13, but also maintains the geometric stability of the gas flow channel through elastic recovery. This dynamic adjustment avoids the gap change caused by pressure fluctuations and further suppresses the generation of turbulence. In addition, according to the Venturi effect, when a fluid passes through a pipe with a contracted cross-section, the flow rate increases while the static pressure decreases; conversely, in the expansion section, the flow rate decreases while the static pressure recovers. The "wide at both ends and narrow in the middle" structure of the first tapered hole 23 and the second tapered hole 24 causes natural gas to accelerate in the contraction section (kinetic energy increases, static pressure decreases) and decelerate in the expansion section (kinetic energy is converted into static pressure), forming a smooth pressure fluctuation curve. This design with a gradually changing cross-section avoids the vortex separation caused by sudden expansion or sudden contraction, thereby reducing the turbulent energy loss, making the gas flow more stable, reducing energy consumption, and the arc-shaped bent hole design of the expansion hole further reduces the local resistance and improves the conveying efficiency.

[0034] Referring to Figure 3 , a circular groove 22 is provided on the outer wall of the buffer seal tube 2, and a snap ring 12 that engages with the groove 22 is provided on the inner wall of the main pipe 1. The cooperation between the groove 22 and the snap ring 12 forms a mechanical interlock to ensure the axial positioning of the buffer seal tube 2 in the main pipe 1 and prevent displacement or detachment under the impact of high-pressure gas flow.

[0035] Referring to Figure 4 , Figure 5 and Figure 8 , an installation cavity 21 is provided inside the buffer seal tube 2. A buffer pad 3 (which can be made of fluororubber or polyurethane) is provided in the installation cavity 21, and absorption holes 31 are provided on the buffer pad 3. Among them, the installation cavity 21 is a cavity structure inside the buffer seal tube 2. When the pressure of natural gas increases, the buffer seal tube 2 expands outward under the action of internal pressure, and the installation cavity 21 provides elastic deformation space to prevent the pipe wall from being damaged due to excessive stress. When the pressure decreases, the elastic retraction of the installation cavity 21 helps the buffer seal tube 2 to return to its original state and maintain the sealing performance.

[0036] Among them, the buffer pad 3 is filled in the installation cavity 21 to provide internal support for the buffer seal pipe 2, preventing it from collapsing or deforming locally under high pressure. When natural gas flows through the buffer seal pipe 2, due to pressure changes and flow direction changes (such as at the turning point of an L-shaped pipe), vibrations and turbulent noises will be generated. The absorption holes 31 absorb vibration energy through the microporous damping effect, reducing the transmission of mechanical vibrations to the pipeline system and thus reducing noise.

[0037] Referring to Figure 1 、 Figure 2 、 Figures 4 - 6 As shown in

[0038] When the air flow passes through the first tapered hole 23, the pressure rise of the natural gas causes the buffer seal pipe 2 and the buffer pad 3 to deform, thereby squeezing the seal bladder 7, and then squeezing the flowing medium into the piston tube 72. The piston plate 74 is used to drive the piston rod 73 to move. During this process, the spring 75 contracts, and the piston rod 73 pushes the valve core 64 to slide, so that the first collection hole 641 originally aligned with the discharge pipe 6 is aligned with the first discharge hole 62 at the bottom. Under the action of gravity, the impurities in the first collection hole 641 are discharged from the valve body 61. At the same time, the second collection hole 642 is aligned with the discharge pipe 6. Under the action of gravity, the impurities inside the expansion hole fall into the discharge pipe 6, and then continue to be discharged into the second collection hole 642. Then when the gas supply to the furnace is stopped, the spring 75 rebounds, resetting the valve core 64 and causing the flowing medium to flow back into the seal bladder 7. After the valve core 64 is reset, the second collection hole 642 is aligned with the second discharge hole 63, and the impurities are discharged under the action of gravity.

[0039] In summary, the device uses the pressure change of natural gas (pressure fluctuation when flowing through the first tapered hole 23) as the power source, transmits pressure through the seal bladder 7 and hydraulic oil, drives the piston to move, and realizes the switching of the valve core 64, without the need for electric power or manual operation, improving the safety of cleaning impurities inside the natural gas pipeline.

[0040] In addition, two collection holes, two discharge holes and a discharge pipe 6 in the device cooperate to achieve sewage discharge by aligning the first collection hole 641 with the first discharge hole 62 during the high-pressure stage, and the second collection hole 642 collects new impurities. During the reset stage, the second collection hole 642 is aligned with the second discharge hole 63 for sewage discharge, and the first collection hole 641 collects new impurities, avoiding blockage of a single channel and ensuring continuous cleaning of impurities.

[0041] Referring to Figure 5 and Figure 7 , an installation ring 26 is fixedly installed on the inner wall of the buffer seal pipe 2. An annular groove 25 is provided between the installation ring 26 and the inner wall of the buffer seal pipe 2. An elastic member 4 is fixedly installed in the annular groove 25. The top of the elastic member 4 is fixedly installed with a filter screen 41 (stainless steel mesh). A sliding rod 51 is slidably installed on the filter screen 41. The top of the sliding rod 51 is fixedly installed with a plugging ball 5 (made of fireproof and heat-insulating material). The sliding rod 51 extends below the filter screen 41 and is fixedly installed with a limiting plate 53. The plugging ball 5 is arranged above the second tapered hole 24. A flapping plate 52 is fixedly installed on the sliding rod 51. The flapping plate 52 is arranged above the filter screen 41.

[0042] During the process of natural gas flowing towards the furnace, it will pass through the filter screen 41, and impurities are removed through the filter screen 41, while the impurities are intercepted at the bottom of the filter screen 41.

[0043] In addition, during the flowing process of natural gas, it drives the plugging ball 5 to rise, thereby connecting the upper end of the second tapered hole 24. During this process, the limiting plate 53 and the sliding rod 51 cooperate to prevent the plugging ball 5 from rising excessively.

[0044] After the gas supply stops and the gas pressures at both ends of the pipe joint are balanced, the plugging ball 5 blocks the second tapered hole 24 under the action of gravity. In addition, during this process, the flapping plate 52 flaps the top of the filter screen 41 to promote the detachment of impurities at the bottom of the filter screen 41. In addition, under the elastic force of the elastic member 4, the filter screen 41 and the plugging ball 5 cooperate to make the plugging ball 5 bounce up and down multiple times, thereby flapping the filter screen 41 multiple times, so as to improve the cleaning effect of the filter screen 41. Among them, by arranging the discharge pipe 6 at the junction of the elbow and the horizontal straight pipe of the main pipe 1, the dropped impurities can flow into the discharge pipe 6 through the arc surface of the expansion hole.

[0045] Moreover, if the temperature of the natural gas at the exhaust end of the pipe joint rises above the safety threshold or combustion occurs, the pressure at the exhaust end of the pipe joint will increase. At this time, the pressure at the exhaust end of the pipe joint is greater than the gas pressure inside the pipe joint. Under the action of the pressure difference, the plugging ball 5 blocks the second tapered hole 24 to prevent the continuous discharge of gas and block the contact between the gas inside the pipe joint and the fire source.

[0046] Referring to Figure 10, furthermore, a communicating cavity is provided inside the plugging ball 5 and the sliding rod 51, a sealing slide plate is slidably arranged inside the sliding rod 51, inert fire extinguishing gas is compressed and filled below the sealing slide plate, powder or liquid fire extinguishing agent is filled above the sealing slide plate, and a cover which will break due to high temperature after contacting with an open fire is designed at the top of the plugging ball 5. When an open fire appears at the exhaust end of the pipe joint, the open fire causes the cover to burn and break. In addition, after the pressure of the compressed gas is released, it is ejected together with the powder or liquid fire extinguishing agent to extinguish the fire, further improving safety.

[0047] The above are only the preferred embodiments of the present invention, and there is no any form of limitation to the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can still make some changes or modifications by using the technical content prompted above into equivalent embodiments of equivalent changes, but as long as it does not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An efficient natural gas furnace supporting pipe joint device with a self-sealing function, including an L-shaped main pipe (1), both ends of the main pipe (1) are respectively connected to a gas pipeline and a furnace pipeline through two groups of connecting flanges (11), and it is characterized in that, Also includes: A buffer sealing tube (2) is fixedly installed in the main pipe (1), the two ends of the buffer sealing tube (2) respectively extend into the gas pipeline and the furnace pipeline, the inner hole of the buffer sealing tube (2) is provided with a first gradient hole (23) and a second gradient hole (24), and when the natural gas passes through the first gradient hole (23) and the second gradient hole (24), the pressure of the natural gas first increases and then decreases; A discharge pipe (6) is fixedly installed at the bottom of the intersection of the bend pipe and the transverse straight pipe of the main pipe (1), and a discharge valve is fixedly installed at the bottom of the discharge pipe (6). When natural gas passes through the first gradient hole (23), the elastic deformation of the buffer sealing pipe (2) caused by the change in natural gas pressure and the hydraulic drive component drive the valve core (64) of the discharge valve to shift and discharge impurities contained in the natural gas inside the pipe joint.

2. The high-efficiency natural gas furnace supporting pipe joint device with self-sealing function according to claim 1, characterized in that, The main pipe (1) and the connecting flanges (11) at both ends are integrally formed, and the connecting flange (11) on the main pipe (1) is connected to the flanges on the gas pipeline and the furnace pipeline by bolts, and a sealing ring (13) is provided between the connecting flange (11) and the flanges.

3. An efficient natural gas furnace supporting pipe joint device with a self-sealing function according to claim 2, characterized in that, The first gradual hole (23) and the second gradual hole (24) are both funnel-shaped holes that are wide at both ends and narrow in the middle. The first gradual hole (23) and the second gradual hole (24) are connected through an expansion hole. The ends of the contraction areas of the first gradual hole (23) and the second gradual hole (24) are respectively aligned with the sealing rings (13) at both ends.

4. An efficient natural gas furnace supporting pipe joint device with a self-sealing function according to claim 1, characterized in that, An annular clamping groove (22) is provided on the outer wall of the buffer sealing tube (2), and a clamping ring (12) engaged with the clamping groove (22) is provided on the inner wall of the main tube (1).

5. The high-efficiency natural gas furnace supporting pipe joint device with a self-sealing function according to claim 4, characterized in that, The buffer sealing tube (2) is provided with a mounting cavity (21), the mounting cavity (21) is provided with a buffer pad (3), and the buffer pad (3) is provided with an absorption hole (31).

6. The high-efficiency natural gas furnace supporting pipe joint device with self-sealing function according to claim 5, characterized in that, The discharge valve comprises a valve body (61) fixedly mounted at the bottom of a discharge pipe (6), the bottom of the valve body (61) being provided with a first discharge hole (62) and a second discharge hole (63), a valve core (64) being slidably disposed inside the valve body (61), and the valve core (64) being provided with a first collection hole (641) and a second collection hole (642).

7. An efficient natural gas furnace supporting pipe joint device with a self-sealing function according to claim 6, characterized in that, A sealing bag (7) is arranged in the buffer pad (3), and the sealing bag (7) is filled with a flowing medium. A piston tube (72) is fixedly installed at the bottom of the main pipe (1), and the piston tube (72) is connected with the sealing bag (7) through a connecting pipe (71). A piston plate (74) is slidably installed in the piston tube (72), and the piston plate (74) is connected to the valve core (64) through a piston rod (73). A spring (75) is sleeved on the piston rod (73), and the two ends of the spring (75) are respectively in contact with the piston plate (74) and the piston tube (72).

8. An efficient natural gas furnace supporting pipe joint device with a self-sealing function according to claim 1, characterized in that, A mounting ring (26) is fixedly mounted on the inner wall of the buffer sealing tube (2), an annular groove (25) is provided between the mounting ring (26) and the inner wall of the buffer sealing tube (2), an elastic member (4) is fixedly mounted in the annular groove (25), and a filter screen (41) is fixedly mounted on the top of the elastic member (4).

9. An efficient natural gas furnace supporting pipe joint device with a self-sealing function according to claim 8, characterized in that, A sliding rod (51) is slidably mounted on the filter screen (41). A plugging ball (5) is fixedly mounted on the top of the sliding rod (51). The sliding rod (51) extends below the filter screen (41) and is fixedly mounted with a limiting plate (53). The plugging ball (5) is arranged above the second tapered hole (24).

10. An efficient natural gas furnace supporting pipe joint device with a self-sealing function according to claim 9, characterized in that, A flapping plate (52) is fixedly mounted on the sliding rod (51). The flapping plate (52) is arranged above the filter screen (41).

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