Gas self-closing valve ultra-underpressure magnetic attraction closing structure and gas self-closing valve

Abstract

The application belongs to the technical field of gas switch and relates to a gas self-closing valve over-voltage and under-voltage magnetic attraction closing structure, which comprises an inclined block, a magnet bolt, a magnet and a pull rod; the inner hole of the magnet is changed into a cylindrical hole, the counterbore hole at the upper end of the inner hole of the magnet is cancelled, the machining process and difficulty of the magnet are reduced, the production efficiency is improved, the magnet is not cut or ground, the magnetism of the magnet is not damaged, the gas self-closing valve cannot cause unnecessary magnet assembly stress during late installation or use, and the application further discloses a gas self-closing valve, and the gas self-closing valve adopting the gas self-closing valve over-voltage and under-voltage magnetic attraction closing structure is safer, more reliable and has a longer service life.

Description

Technical Field

[0001] This invention belongs to the field of gas switch technology, and relates to a gas self-closing valve over / under pressure magnetic attraction closing structure and a gas self-closing valve. Background Technology

[0002] The pipeline gas self-closing valve is a unique safety valve in my country, mainly used to prevent natural gas accidents in residential homes. Because it relies on the valve itself to monitor and judge gas pressure and flow parameters and then actuate to close the gas passage, it requires no electricity, is simple, safe, and reliable, and has been widely used in recent years.

[0003] The existing magnetic attraction structure of self-closing valves has the following problems: The magnet has a conical countersunk hole in the middle so that the screw head can press and fix the magnet. On the one hand, the conical countersunk hole of the magnet needs to be completed manually one by one, which makes it difficult to achieve high-quality and efficient production. On the other hand, it will cause assembly stress on the magnet, causing the magnet to break during use and the product's safety function to fail. The bottom of the pull rod is in direct contact with the magnet. When it is disengaged and re-attracted due to overpressure, it will impact the magnet, causing the magnet to break and lose its original shape, thus failing the product's safety function. At the same time, since the magnet contains flammable rare earth materials, direct contact during attraction can easily generate impact sparks, which can cause an internal fire source in the self-closing valve, which is detrimental to structural safety.

[0004] Therefore, a magnetic structure that is simpler and more convenient to manufacture and safer and more reliable to use is needed to solve this technical problem. Summary of the Invention

[0005] The technical solution adopted by this invention to solve the technical problem is: a gas self-closing valve over / under pressure magnetic attraction closing structure, including: a wedge block, a magnetic bolt, a magnet, and a pull rod. The wedge block is used to convert the up-and-down movement into the left-and-right movement of the push rod inside the gas self-closing valve. The pull rod is used to move up and down together with the wedge block under the attraction of the magnet. The inner core of the magnet has a cylindrical first through hole. The first through hole in the middle of the magnet is a cylindrical straight hole. Instead of machining a conical countersunk hole at the top of the first through hole, the processing steps and difficulty of the magnet are reduced, and the production efficiency is improved. At the same time, the magnet is not cut or ground, so the magnetism of the magnet will not be damaged, and unnecessary magnet assembly stress will not be caused during later installation and use.

[0006] The outer wall of the magnet has a grooved magnet sleeve. The axial thickness of the magnet is less than the groove depth of the inner groove of the magnet sleeve. The bottom of the groove of the magnet sleeve has a second through hole. The magnet bolt passes through the first through hole and the second through hole from top to bottom and is then threaded onto the upper part of the wedge. The magnet sleeve is made of elastic non-metallic material. The axial thickness of the magnet is less than the groove depth of the inner groove of the magnet sleeve. Therefore, when the magnet is installed in the groove of the magnet sleeve, the upper surface of the magnet is lower than the upper edge of the magnet sleeve. When the pull rod is attracted and pressed down by magnetic force, the bottom of the pull rod impacts or strikes the upper edge of the magnet sleeve, rather than impacting or striking the magnet. This avoids the possibility of impact sparks when the pull rod is attracted by magnetic force, which is more conducive to the safety of the gas valve and the user. At the same time, the pull rod no longer impacts or strikes the magnet when it is attracted by magnetic force, avoiding the possibility of damage to the magnet after long-term impact, extending the service life of the magnet, and thus extending the service life of the gas valve.

[0007] The magnetic bolt is a countersunk bolt, and a retaining ring is fitted at the root of the magnetic bolt thread. When the magnetic bolt is threaded to connect to the wedge block, the magnetic bolt presses the inner ring of the retaining ring, and the outer ring of the retaining ring presses the magnet from top to bottom against the bottom of the groove of the magnetic sleeve. The retaining ring is used to press the magnet against the bottom of the groove of the magnetic sleeve, and at the same time can play the role of isolation and primary shock absorption.

[0008] Preferably, the magnet is cylindrical and the magnet sleeve is grooved; the cylindrical magnet and the grooved magnet sleeve are easier to process and the matching and clamping are more reliable.

[0009] More preferably, the retaining ring is a magnetic pressure plate with a circular and conical shape that runs through it axially. The magnetic pressure plate has a third through hole along the axial direction. The third through hole, the magnetic pressure plate, and the magnet are on the same rotation axis. After the magnetic bolt passes through the magnetic pressure plate and presses the magnet, the bolt head of the magnetic bolt sinks into the conical lower groove of the magnetic pressure plate. The bottom surface of the pull rod is pressed against the upper surface of the magnetic pressure plate. The outer conical surface of the bottom of the magnetic pressure plate is located in the first through hole of the magnet, and the outer circular surface of the bottom of the magnetic pressure plate is pressed downward against the upper surface of the magnet. The bottom of the pull rod can be set as a downwardly protruding truncated ring. The lower protruding truncated ring of the pull rod is pressed against the upper surface of the magnetic pressure plate. Therefore, the bottom of the pull rod does not directly contact the magnet and the magnetic bolt. If the magnetic pressure plate is made of a non-metallic elastic material, the pull rod maintains elastic contact with the lower magnetic attraction structure and non-metallic conductor when it is magnetically attracted and pressed down, reducing the possibility of impact and further reducing the possibility of generating impact sparks.

[0010] More preferably, an elastic pad is provided between the bottom of the magnetic pressure plate and the top of the magnet; the elastic pad changes the rigid contact between the magnetic pressure plate and the magnet into an elastic contact, reducing impact and making it safer and more reliable.

[0011] More preferably, the magnet sleeve is fixedly provided with an inner cylinder coaxial with the magnet sleeve, the retaining ring is the inner cylinder of the magnet sleeve, the inner cylinder of the magnet sleeve is made of elastic non-metallic material, the upper edge of the inner cylinder is higher than the upper edge of the outer ring of the magnet sleeve, the outer diameter of the inner cylinder is the same as the diameter of the first through hole of the magnet, the outer diameter of the magnet bolt head is larger than the outer diameter of the inner cylinder, the bottom of the pull rod is pressed against the top of the bolt head of the magnet bolt; the lower convex ring of the pull rod is pressed against the upper edge of the outer ring of the magnet sleeve, and the bottom of the lower convex ring of the pull rod is pressed against the top of the bolt head of the magnet bolt; when the magnet bolt thread is tightened with the wedge block, because the outer diameter of the magnet bolt head is large and the outer diameter of the inner cylinder is small compared to the diameter of the first through hole of the magnet, the bolt head of the magnet bolt will press against the elastic material. When the inner cylinder of the magnet sleeve is pressed down, it deforms and expands radially, causing the upper surface of the magnet to press down and clamp the magnet to the bottom of the slot in the magnet sleeve. When the pull rod is magnetically attracted and pressed down, the bottom of the pull rod impacts or strikes the upper edge of the magnet sleeve or the upper surface of the magnet bolt head, rather than impacting or striking the magnet. This avoids the possibility of the pull rod directly impacting or striking the magnet when it is magnetically attracted, which may generate impact sparks. This is more conducive to the safety of the gas valve and the user. At the same time, the pull rod no longer impacts or strikes the magnet when it is magnetically attracted, avoiding the possibility of damage to the magnet after long-term impact, extending the service life of the magnet, and thus extending the service life of the gas valve.

[0012] This invention also discloses a gas self-closing valve, which adopts the above-mentioned gas self-closing valve over / under pressure magnetic closing structure. The gas self-closing valve further includes: a shell, a sealing ring, a push rod, a diaphragm, and a diaphragm pressure plate. The shell has a gas passage, and the push rod can reciprocate along the axial direction of the gas passage. The sealing ring is fixed to one end of the push rod. When the push rod drives the sealing ring to reciprocate, it closes or opens the gas passage of the shell. An inclined block is provided with an inclined groove, and the inclined groove of the inclined block is slidably connected to a small shaft protrusion on the push rod. A magnetic bolt passes through a magnetic pressure plate, a magnet, and a magnetic sleeve and is integrated with the inclined block, and can move up and down along the groove of the shell. The inclined block has an inclined groove, and the push rod has a small shaft protrusion, which can convert the up and down movement of the inclined block into the left and right movement of the push rod. When the inclined block moves upward, the push rod moves to the right, driving the sealing ring to open the gas flow passage of the shell. When the inclined block moves downward, the push rod moves to the left, driving the sealing ring to close the gas flow passage of the shell.

[0013] The diaphragm is disc-shaped with an annular elastic deformation arc coaxial with it. A pull rod is fixedly connected to the center of the diaphragm, and the housing is fixedly connected to the outer circumference of the diaphragm. The pull rod is fixedly connected to the center of the diaphragm pressure plate. The diaphragm pressure plate presses the diaphragm against the lower end of the pull rod from top to bottom. The pull rod, diaphragm, and diaphragm pressure plate are on the same axis of rotation. The diaphragm and diaphragm pressure plate are used to generate a recoverable elastic deformation of the diaphragm when the pull rod rises or falls due to overpressure or underpressure inside the housing. When the pressure inside the housing returns to normal, an external force pushes the pull rod, which is then elastically restored to its initial position by the diaphragm, thereby driving the push rod and sealing ring to move axially and opening the air passage inside the housing.

[0014] The upper end of the pull rod extends out of the housing from the top cover; the upper end of the pull rod extending out of the housing is used to push the pull rod back to its initial position when the internal pressure of the housing returns to normal.

[0015] Preferably, the membrane pressure plate presses down on the middle of the membrane from top to bottom, and the elastic deformation arc of the membrane is located outside the circumferential edge of the membrane pressure plate. The membrane pressure plate is provided with radially distributed notches and grooves so that it can be embedded in the pull rod by deformation of the inner hole during assembly, and the membrane is pressed tightly on the pull rod.

[0016] Preferably, an indicator is provided at the upper end of the pull rod, and a deformation clip is provided on the indicator. The indicator is fastened to the annular groove at the upper end of the pull rod by the deformation clip. The position of the indicator indicates that the gas pressure in the housing cavity is normal and the valve is in the normal open working state.

[0017] Preferably, a limiting plate is fixedly provided in the inner cavity of the housing, and a limiting hole is provided on the limiting plate. The inclined block slides through the limiting hole on the limiting plate, and the magnetic bolt is threaded to the inclined block from the top of the limiting plate. The push rod is slidably connected to the inclined block from the bottom of the limiting plate. The limiting plate is fixed on the housing and together with the groove of the housing, it forms the movement track of the inclined block, which restricts the inclined block to slide up and down in the vertical direction, thereby more effectively converting the up and down movement of the pull rod into the left and right movement of the push rod.

[0018] Preferably, an overcurrent differential pressure sensor is provided at the air passage opening of the housing. Its function is to form a certain airflow pressure difference before and after it, causing the blockage plate in the overcurrent differential pressure sensor to overcome the spring force and close the air passage, so as to ensure the sensitivity and reliability of the overcurrent closing function of the self-closing valve.

[0019] The beneficial effects of this invention are:

[0020] 1. This invention reduces the processing steps and difficulty of the magnet by changing the inner hole of the magnet to a cylindrical hole and eliminating the countersunk hole at the upper end of the inner hole of the magnet, thereby improving production efficiency. At the same time, it avoids cutting or grinding the magnet, thus preventing damage to the magnet's magnetism and ensuring that the gas self-closing valve will not cause unnecessary magnet assembly stress during later installation or use.

[0021] 2. The present invention sets the bottom of the pull rod to not directly contact the magnet, which can prevent the risk of the pull rod hitting the magnet and causing the magnet to break and fail during overpressure reset, as well as the safety risk of sparks generated by the impact on the magnet. When the pull rod is magnetically attracted and pressed down, it maintains elastic contact with the lower magnetic attraction structure and non-metallic conductor, reducing the possibility of impact. This can prevent the magnet from being subjected to compressive stress during assembly or use, causing the magnet to break and fail, and further reduces the possibility of impact sparks. Attached Figure Description

[0022] Figure 1This is a schematic diagram of an over / under pressure magnetic closing structure for a gas self-closing valve and a magnetic closing structure with a magnetic pressure plate for the gas self-closing valve.

[0023] Figure 2 yes Figure 1 Schematic diagram of explosive decomposition;

[0024] Figure 3 This is a schematic diagram of a magnetic closing structure without a magnetic pressure plate;

[0025] Figure 4 yes Figure 3 A schematic diagram of the explosive decomposition;

[0026] Figure 5 This is a schematic diagram of a gas self-closing valve with a magnetic pressure plate;

[0027] Figure 6 yes Figure 5 A magnified view of the area along direction A;

[0028] Figure 7 This is a schematic diagram of a gas self-closing valve without a magnetic pressure plate;

[0029] Figure 8 yes Figure 7 A magnified schematic diagram of the B-axis;

[0030] Figure 9 This is a schematic diagram of the membrane pressure plate;

[0031] Figure 10 This is a schematic diagram of an indicator.

[0032] In the diagram: 1. Housing; 2. Overcurrent differential pressure sensor; 3. Sealing ring; 4. Push rod; 5. Wedge block; 6. Magnetic bolt; 7. Limiting plate; 8. Limiting plate screw; 9. Magnet; 10. Magnetic sleeve; 11. Magnetic pressure plate; 12. Pull rod; 13. Diaphragm; 14. Diaphragm pressure plate; 15. Lifting reset handle; 16. Indicator; 17. Nameplate; 18. Riveting ring; 19. Top cover; 20. Reset spring; 21. Limiting snap ring. Detailed Implementation

[0033] The related technologies of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] refer to Figures 1-10A gas self-closing valve over / under pressure magnetic closing structure includes: a wedge block 5, a magnetic bolt 6, a magnet 9, and a pull rod 12. The wedge block 5 is used to convert the up-and-down movement into the left-and-right movement of the push rod 4 inside the gas self-closing valve. The pull rod 12 is used to move up and down together with the wedge block 5 under the attraction of the magnet 9. The inner core of the magnet 9 has a cylindrical first through hole. The first through hole in the middle of the magnet 9 is a cylindrical straight hole. The conical countersunk hole is no longer processed at the top of the first through hole, which reduces the processing steps and difficulty of the magnet 9, improves production efficiency, and at the same time, without cutting or grinding the magnet 9, it will not damage the magnetism of the magnet 9 and will not cause unnecessary magnet assembly stress during later installation and use.

[0035] The outer wall of magnet 9 is fitted with a grooved magnet sleeve 10. The axial thickness of magnet 9 is less than the groove depth of magnet sleeve 10. The bottom of the groove of magnet sleeve 10 is provided with a second through hole. Magnet bolt 6 passes through the first through hole and the second through hole from top to bottom and is threaded to the upper part of inclined block 5. Magnet sleeve 10 is made of elastic non-metallic material. The axial thickness of magnet 9 is less than the groove depth of magnet sleeve 10. Therefore, when magnet 9 is installed in the groove of magnet sleeve 10, the upper surface of magnet 9 is lower than the upper edge of magnet sleeve 10. When pull rod 12 is magnetically attracted and pressed down, the bottom of pull rod 12 impacts or hits the upper edge of magnet sleeve 10 instead of impacting or hitting magnet 9. This avoids the possibility of impact sparks when pull rod 12 is magnetically attracted, which is more conducive to the safety of gas valve and user. At the same time, when pull rod 12 is magnetically attracted, it no longer impacts or hits magnet 9, avoiding the possibility of magnet 9 being damaged after long-term impact, extending the service life of magnet 9, and thus extending the service life of gas valve.

[0036] The magnetic bolt 6 is a countersunk bolt. A retaining ring is fitted at the root of the magnetic bolt 6. When the magnetic bolt 6 is threaded to the inclined block 5, the magnetic bolt 6 presses the inner ring of the retaining ring, and the outer ring of the retaining ring presses the magnet 9 from top to bottom against the bottom of the groove of the magnet sleeve 10. The retaining ring is used to press the magnet 9 against the bottom of the groove of the magnet sleeve 10, and at the same time can play the role of isolation and primary shock absorption.

[0037] Furthermore, the magnet 9 is cylindrical and the magnet sleeve 10 is grooved; the cylindrical magnet 9 and the grooved magnet sleeve 10 are easier to process and more reliable in matching and clamping.

[0038] Furthermore, the retaining ring is a circular and conical magnetic pressure plate 11 that runs axially through each other. The magnetic pressure plate 11 has a third through hole along the axial direction. The third through hole, the magnetic pressure plate 11, and the magnet 9 are on the same rotation axis. After the magnetic bolt 6 passes through the magnetic pressure plate 11 and presses the magnet 9, the bolt head of the magnetic bolt 6 sinks into the conical lower groove of the magnetic pressure plate 11. The bottom surface of the pull rod 12 is pressed against the upper surface of the magnetic pressure plate 11. The outer conical surface of the bottom of the magnetic pressure plate 11 is located in the first through hole of the magnet 9. The rounded surface is pressed down on the upper surface of the magnet 9; the bottom of the pull rod 12 can be set as a downward protruding ring-shaped platform. The lower protruding ring-shaped platform of the pull rod 12 is pressed against the upper surface of the magnet pressure plate 11. Therefore, the bottom of the pull rod 12 does not directly contact the magnet 9 and the magnet bolt 6. If the magnet pressure plate 11 is made of a non-metallic elastic material, the pull rod 12 will maintain elastic contact with the lower magnetic attraction structure and non-metallic conductor when it is magnetically attracted and pressed down, reducing the possibility of impact and collision, and further reducing the possibility of generating impact sparks.

[0039] Furthermore, an elastic pad is provided between the bottom of the magnetic pressure plate 11 and the upper part of the magnet 9; the elastic pad changes the rigid contact between the magnetic pressure plate 11 and the magnet 9 into an elastic contact, reducing impact and making it safer and more reliable.

[0040] Furthermore, the magnet sleeve 10 is fixedly provided with an inner cylinder coaxial with the magnet sleeve 10, and the retaining ring is the inner cylinder of the magnet sleeve 10. The inner cylinder of the magnet sleeve 10 is made of elastic non-metallic material. The upper edge of the inner cylinder is higher than the upper edge of the outer ring of the magnet sleeve 10. The outer diameter of the inner cylinder is the same as the diameter of the first through hole of the magnet 9. The outer diameter of the bolt head of the magnet bolt 6 is larger than the outer diameter of the inner cylinder. The bottom of the pull rod 12 is pressed against the top of the bolt head of the magnet bolt 6. The lower convex ring of the pull rod 12 is pressed against the upper edge of the outer ring of the magnet sleeve 10, and the bottom of the lower convex ring of the pull rod 12 is pressed against the top of the bolt head of the magnet bolt 6. When the thread of the magnet bolt 6 is tightened with the inclined block 5, because the outer diameter of the bolt head of the magnet bolt 6 is large and the outer diameter of the inner cylinder is small compared with the diameter of the first through hole of the magnet 9, the bolt head of the magnet bolt 6 will elastically... The inner cylinder of the magnet sleeve 10, made of a certain material, deforms and expands radially after being pressed down. This deformation causes the upper surface of the magnet 9 to be pressed down, thus pressing the magnet 9 firmly against the bottom of the slot in the magnet sleeve 10. When the pull rod 12 is magnetically attracted and pressed down, its bottom impacts or strikes the upper edge of the magnet sleeve 10 or the upper surface of the bolt head of the magnet bolt 6, rather than the magnet 9. This avoids the possibility of the pull rod 12 directly impacting or striking the magnet 9 and generating sparks, which is more conducive to the safety of the gas valve and the user. At the same time, the pull rod 12 no longer impacts or strikes the magnet 9 when magnetically attracted, avoiding the possibility of damage to the magnet 9 after long-term impact and extending the service life of the magnet 9. Therefore, the service life of the gas valve is extended.

[0041] This invention also discloses a gas self-closing valve, which adopts the above-mentioned gas self-closing valve over / under pressure magnetic closing structure. The gas self-closing valve further includes: a housing 1, a sealing ring 3, a push rod 4, a diaphragm 13, and a diaphragm pressure plate 14. The housing 1 is provided with a gas passage. The push rod 4 can reciprocate along the axial direction of the gas passage. The sealing ring 3 is fixed to one end of the push rod 4. When the push rod 4 drives the sealing ring 3 to reciprocate, it closes or opens the gas passage of the housing 1. An inclined block 5 is provided with an inclined groove, and the inclined groove of the inclined block 5 is slidably connected. The push rod 4 has a small shaft protrusion; the magnetic bolt 6 passes through the magnetic pressure plate 11, the magnet 9, the magnetic sleeve 10 and is connected to the inclined block 5 as a whole, and can move up and down along the groove of the housing 1; the inclined block 5 has an inclined groove and the push rod 4 has a small shaft protrusion, which can convert the up and down movement of the inclined block 5 into the left and right movement of the push rod 4; when the inclined block 5 moves upward, the push rod 4 moves to the right, driving the sealing ring 3 to open the airflow channel of the housing 1; when the inclined block 5 moves downward, the push rod 4 moves to the left, driving the sealing ring 3 to close the airflow channel of the housing;

[0042] The diaphragm 13 is disc-shaped and has an annular elastic deformation arc coaxial with the diaphragm 13. The pull rod 12 is fixedly connected to the middle of the diaphragm 13, and the housing 1 is fixedly connected to the outer circumference of the diaphragm 13. The pull rod 12 is fixedly connected to the middle of the diaphragm pressure plate 14. The diaphragm pressure plate 14 presses the diaphragm 13 against the lower end of the pull rod 12 from top to bottom. The pull rod 12, the diaphragm 13, and the diaphragm pressure plate 14 are on the same axis of rotation. The diaphragm 13 and the diaphragm pressure plate 14 are used to generate a recoverable elastic deformation when the pull rod 12 rises or falls due to overpressure or underpressure inside the housing 1. When the pressure inside the housing 1 returns to normal, an external force pushes the pull rod 12, which will cause the diaphragm 13 to elastically return to its initial position, thereby driving the push rod 4 and the sealing ring 3 to move axially and open the air passage inside the housing 1.

[0043] The upper end of the pull rod 12 extends out of the housing 1 from the upper cover 19; the upper end of the pull rod 12 extends out of the housing 1 and is used to push the pull rod 12 back to the initial position when the internal pressure of the housing 1 returns to normal.

[0044] Furthermore, the membrane pressure plate 14 presses down on the middle of the membrane 13 from top to bottom. The elastic deformation arc of the membrane 13 is located outside the circumferential edge of the membrane pressure plate 14. The membrane pressure plate 14 is provided with radially distributed notches and grooves so that it can be embedded in the pull rod 12 by deformation of the inner hole during assembly, and the membrane 13 is pressed on the pull rod 12.

[0045] Furthermore, an indicator 16 is provided at the upper end of the pull rod 12. The indicator 16 is equipped with a deformation clip, and the indicator 16 is fastened to the annular groove at the upper end of the pull rod 12 through the deformation clip. The position of the indicator 16 indicates that the gas pressure in the cavity of the housing 1 is normal and the valve is in the normal open working state.

[0046] Furthermore, a limiting plate 7 is fixedly provided in the inner cavity of the housing 1. The limiting plate 7 has a limiting hole. The inclined block 5 slides through the limiting hole on the limiting plate 7. The magnetic bolt 6 is threadedly connected to the inclined block 5 from the top of the limiting plate 7. The push rod 4 is slidably connected to the inclined block 5 from the bottom of the limiting plate 7. The limiting plate 7 is fixed on the housing 1 and together with the groove of the housing 1, it forms the movement track of the inclined block 5, which restricts the inclined block 5 to slide up and down in the vertical direction, thereby more effectively converting the up and down movement of the pull rod 12 into the left and right movement of the push rod 4.

[0047] Furthermore, an overcurrent differential pressure sensor 2 is provided at the air passage opening of the housing 1; its function is to form a certain airflow pressure difference before and after it, causing the blockage plate in the overcurrent differential pressure sensor 2 to overcome the spring force and close the air passage, so as to ensure the sensitivity and reliability of the overcurrent closing function of the self-closing valve.

[0048] Example

[0049] Example 1: See Figures 5-6 The over / under pressure magnetic closing structure of the pipeline gas self-closing valve provided in this embodiment includes: a housing 1, an overcurrent differential pressure sensor 2, a sealing ring 3, a push rod 4, a wedge block 5, a magnetic bolt 6, a limiting plate 7, a limiting plate screw 8, a magnet 9, a magnetic sleeve 10, a magnetic pressure plate 11, a pull rod 12, a diaphragm 13, a diaphragm pressure plate 14, a pull-reset handle 15, an indicator 16, a nameplate 17, a rivet ring 18, and a top cover 19.

[0050] The magnetic pressure plate 11 has a third through hole along the axial direction. The third through hole, the magnetic pressure plate 11, and the magnet 9 are on the same rotation axis. After the magnetic bolt 6 passes through the magnetic pressure plate 11 and presses the magnet 9, the bolt head of the magnetic bolt 6 sinks into the conical lower groove of the magnetic pressure plate 11. The bottom surface of the pull rod 12 is pressed against the upper surface of the magnetic pressure plate 11. The outer conical surface of the bottom of the magnetic pressure plate 11 is located in the first through hole of the magnet 9, and the outer circular surface of the bottom of the magnetic pressure plate 11 is pressed downward against the upper surface of the magnet 9. The bottom of the pull rod 12 can be set as a downward protruding annular platform. The lower protruding annular platform of the pull rod 12 is pressed against the upper surface of the magnetic pressure plate 11. Therefore, the bottom of the pull rod 12 does not directly contact the magnet 9 and the magnetic bolt 6. If the magnetic pressure plate 11 is made of a non-metallic elastic material, the pull rod 12 will maintain elastic contact with the lower magnetic attraction structure and non-metallic conductor when it is magnetically attracted and pressed down, reducing the possibility of impact and further reducing the possibility of generating impact sparks.

[0051] The pipeline gas self-closing valve is assembled from the magnetic closing structure with the magnetic pressure plate 11. The sealing ring 3 is fixed to one end of the push rod 4 and can move axially along the gas passage of the housing 1 together with the push rod 4. When it moves to the left, it closes the gas passage of the housing 1, and when it moves to the right, it opens the gas passage of the housing 1.

[0052] The magnetic bolt 6 passes through the magnetic pressure plate 11, the magnet 9, the magnetic sleeve 10, and is connected to the inclined block 5 as a whole. It can move up and down along the groove of the housing 1 and the middle hole of the limiting plate 7. The inclined block 5 has an inclined groove, and the push rod 4 has a small protruding shaft, which can convert the up and down movement of the inclined block 5 into the left and right movement of the push rod 4. When the inclined block 5 moves upward, the push rod 4 moves to the right, which drives the sealing ring 3 to open the airflow channel of the housing 1. When the inclined block 5 moves downward, the push rod 4 moves to the left, which drives the sealing ring 3 to close the airflow channel of the housing 1.

[0053] The limiting plate 7 is fixed to the housing 1 by the limiting plate screw 8, and together with the groove of the housing 1, they form the movement track of the inclined block 5.

[0054] The inner hole of the membrane pressure plate 14 has evenly distributed notches and grooves, such as Figure 5 As shown, this allows the inner hole to deform and secure the indicator 16 within the annular groove of the pull rod 12 during assembly, thus pressing the diaphragm 13 firmly onto the pull rod 12; the indicator 16 has evenly distributed notched grooves circumferentially in its inner hole, such as... Figure 9 As shown, the nameplate 17 is embedded in the groove of the indicator 16 so that it can be fixed in the annular groove of the pull rod 12 by deformation of the inner hole during assembly. These parts are connected to the pull rod 12 as a whole and move up and down with the pull rod 12.

[0055] Under the attraction of magnet 9, pull rod 12 is attracted to magnet 9 when the gas pressure in chamber 1 is normal or insufficient, and moves up and down together with inclined block 5. When the gas pressure in chamber 1 is normal, magnet 9 overcomes the attraction of limit plate 7 and moves away from limit plate 7, driving push rod 4 and sealing ring 3 through inclined block 5 to open the airflow channel of chamber 1. The normal gap between indicator 16 and lifting reset handle 15 indicates that the gas pressure in chamber 1 is normal and the valve is in normal open working state. When the gas pressure in chamber 1 is insufficient, magnet 9 attracts limit plate 7, driving push rod 4 and sealing ring 3 through inclined block 5 to open the airflow channel of chamber 1. Rod 4 and sealing ring 3 close the airflow channel of housing 1. The indicator 16, with no gap between itself and the lifting reset handle 15, indicates underpressure in housing 1. When the gas pressure in housing 1 is too high, magnet 9 disengages from pull rod 12. Pull rod 12 and its accessories move upwards to the upper limit position under gas pressure. The indicator 16 clearly protrudes above this position, and the excessive gap between it and the lifting reset handle 15 indicates overpressure in housing 1. Simultaneously, magnet 9 overcomes the attraction of pull rod 12 and moves downwards, engaging with limit plate 7. This drives push rod 4 and sealing ring 3 to close the airflow channel of housing 1 via inclined block 5. Because the countersunk hole at the upper end of the inner hole of magnet 9 is eliminated in this pipeline gas self-closing valve, production efficiency is higher, cost is lower, and the magnet's magnetism is better. Since pull rod 12 does not directly impact or strike magnet 9, this pipeline gas self-closing valve is safer, more reliable, and has a longer service life.

[0056] Example 2: Except for the over / under pressure magnetic closing structure of the gas self-closing valve, this example is the same as Example 1. See [link to example]. Figures 7-8A coaxial inner cylinder is fixed inside the magnet sleeve 10. The retaining ring is the inner cylinder of the magnet sleeve 10. The inner cylinder of the magnet sleeve 10 is made of elastic non-metallic material. The upper edge of the inner cylinder is higher than the upper edge of the outer ring of the magnet sleeve 10. The outer diameter of the inner cylinder is the same as the diameter of the first through hole of the magnet 9. The outer diameter of the bolt head of the magnet bolt 6 is larger than the outer diameter of the inner cylinder. The bottom of the pull rod 12 is pressed against the top of the bolt head of the magnet bolt 6. The lower convex ring of the pull rod 12 is pressed against the upper edge of the outer ring of the magnet sleeve 10, and the bottom of the lower convex ring of the pull rod 12 is pressed against the top of the bolt head of the magnet bolt 6. When the thread of the magnet bolt 6 is tightened with the wedge block 5, because the outer diameter of the bolt head of the magnet bolt 6 is large and the outer diameter of the inner cylinder is small compared to the diameter of the first through hole of the magnet 9, the bolt head of the magnet bolt 6... When the upper opening of the inner cylinder of the magnet sleeve 10, made of elastic material, is pressed down, it deforms and expands radially. This deformation causes the upper opening of the inner cylinder of the magnet sleeve 10 to press down and tighten the upper surface of the magnet 9, pressing the magnet 9 firmly against the bottom of the groove of the magnet sleeve 10. When the pull rod 12 is magnetically attracted and pressed down, the bottom of the pull rod 12 impacts or strikes the upper edge of the magnet sleeve 10 or the upper surface of the bolt head of the magnet bolt 6, rather than impacting or striking the magnet 9. This avoids the possibility of the pull rod 12 directly impacting or striking the magnet 9 when it is magnetically attracted, thus preventing the possibility of impact sparks. This is more conducive to the safety of the gas valve and the user. At the same time, the pull rod 12 no longer impacts or strikes the magnet 9 when it is magnetically attracted, avoiding the possibility of damage to the magnet 9 after long-term impact and extending the service life of the magnet 9. In this embodiment, the rest of the gas self-closing valve is the same as in Embodiment 1. Therefore, in this embodiment, the countersunk hole at the upper end of the inner hole of the magnet 9 is eliminated, resulting in higher production efficiency, lower cost, and better magnetism of the magnet. Since the pull rod 12 does not directly impact or strike the magnet 9, the pipeline gas self-closing valve is safer and more reliable to use, and has a longer service life.

[0057] By adopting this embodiment, the following can be achieved: magnet 9 does not require countersunk holes, which is beneficial to improving product quality and production efficiency, thereby accelerating the promotion and application of pipeline gas self-closing valve products and protecting the personal and property safety of the people; magnet 9 does not directly contact the pull rod 12, which can prevent the quality risk of magnet 9 breaking and failing due to the pull rod 12 hitting magnet 9 during overpressure reset, as well as the safety risk of sparks generated by the impact of the pull rod 12 hitting magnet 9; magnet bolt 6 does not directly contact magnet 9, which can prevent the quality risk of magnet 9 breaking and failing due to compressive stress during assembly.

[0058] In summary, this invention reduces the processing steps and difficulty of the magnet by changing the inner hole of the magnet to a cylindrical hole and eliminating the countersunk hole at the upper end of the inner hole of the magnet, thereby improving production efficiency. At the same time, it avoids cutting or grinding the magnet, thus preventing damage to the magnet's magnetism and preventing unnecessary magnet assembly stress during later installation or use of the gas self-closing valve. This invention also discloses a gas self-closing valve. The gas self-closing valve using the above-mentioned over- and under-pressure magnetic attraction closing structure is safer, more reliable, and has a longer service life. Therefore, this invention has broad application prospects.

[0059] It should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A gas self-closing valve over / under pressure magnetic closing structure, comprising: Inclined block (5), magnetic bolt (6), magnet (9), pull rod (12), wherein the inclined block (5) is used to convert the up-and-down movement into the left-and-right movement of the push rod (4) inside the gas self-closing valve, and the pull rod (12) is used to move up and down together with the inclined block (5) under the attraction of the magnet (9), wherein the inner core of the magnet (9) is provided with a cylindrical first through hole; The outer wall of the magnet (9) is fitted with a grooved magnet sleeve (10). The axial thickness of the magnet (9) is less than the groove depth of the inner groove of the magnet sleeve (10). The bottom of the groove of the magnet sleeve (10) is provided with a second through hole. The magnet bolt (6) passes through the first through hole and the second through hole from top to bottom and is then threaded onto the upper part of the inclined block (5). The magnetic bolt (6) is a countersunk bolt. A retaining ring is fitted at the root of the screw of the magnetic bolt (6). When the magnetic bolt (6) is threaded to the inclined block (5), the magnetic bolt (6) presses the inner ring of the retaining ring, and the outer ring of the retaining ring presses the magnet (9) from top to bottom into the groove of the magnetic sleeve (10).

2. The gas self-closing valve over / under pressure magnetic closing structure according to claim 1, characterized in that, The magnet (9) is cylindrical, and the magnet sleeve (10) is grooved.

3. The gas self-closing valve over / under pressure magnetic closing structure according to claim 2, characterized in that, The retaining ring is a circular and conical magnetic pressure plate (11) that runs through the axis. The magnetic pressure plate (11) has a third through hole along the axis. The third through hole, the magnetic pressure plate (11), and the magnet (9) are on the same rotation axis. After the magnetic bolt (6) passes through the magnetic pressure plate (11) and presses the magnet (9) together, the bolt head of the magnetic bolt (6) sinks into the conical lower groove of the magnetic pressure plate (11). The bottom surface of the pull rod (12) is pressed against the upper surface of the magnetic pressure plate (11).

4. The gas self-closing valve over / under pressure magnetic closing structure according to claim 3, characterized in that, An elastic pad is provided between the bottom of the magnet pressure plate (11) and the upper part of the magnet (9).

5. The gas self-closing valve over / under pressure magnetic closing structure according to claim 2, characterized in that, The magnet sleeve (10) is fixed with an inner cylinder coaxial with the magnet sleeve (10). The retaining ring is the inner cylinder of the magnet sleeve (10). The inner cylinder of the magnet sleeve (10) is made of elastic non-metallic material. The upper edge of the inner cylinder is higher than the upper edge of the outer ring of the magnet sleeve (10). The outer diameter of the inner cylinder is the same as the diameter of the first through hole of the magnet (9). The outer diameter of the bolt head of the magnet bolt (6) is larger than the outer diameter of the inner cylinder. The bottom of the pull rod (12) is pressed against the top of the bolt head of the magnet bolt (6).

6. A gas self-closing valve, characterized in that, The gas self-closing valve adopts the gas self-closing valve over- and under-pressure magnetic closing structure as described in any one of claims 1 to 5. The gas self-closing valve further includes: a housing (1), a sealing ring (3), a push rod (4), a diaphragm (13), and a diaphragm pressure plate (14). The housing (1) is provided with a gas passage. The push rod (4) can reciprocate along the axial direction of the gas passage. The sealing ring (3) is fixed to one end of the push rod (4). When the push rod (4) drives the sealing ring (3) to reciprocate, it closes or opens the gas passage of the housing (1). The inclined block (5) is provided with an inclined groove, and the inclined groove of the inclined block (5) is slidably connected to the small shaft protrusion on the push rod (4); The membrane (13) is disc-shaped, and the membrane (13) has an annular elastic deformation arc coaxial with the membrane (13). The middle part of the membrane (13) is fixedly connected to the pull rod (12), and the outer circumference of the membrane (13) is fixedly connected to the shell (1). The middle part of the membrane pressure plate (14) is fixedly connected to the pull rod (12). The membrane pressure plate (14) presses the membrane (13) against the lower end of the pull rod (12) from top to bottom. The pull rod (12), the membrane (13), and the membrane pressure plate (14) are on the same rotation axis. The upper end of the pull rod (12) extends out of the housing (1) from the upper cover (19).

7. A gas self-closing valve according to claim 6, characterized in that, The membrane pressure plate (14) is disc-shaped and is pressed from top to bottom into the middle of the membrane (13). The elastic deformation arc of the membrane (13) is located outside the circumferential edge of the membrane pressure plate (14). The membrane pressure plate (14) has radially distributed notches and grooves.

8. A gas self-closing valve according to claim 6, characterized in that, An indicator (16) is provided at the upper end of the pull rod (12), and a deformation clip is provided on the indicator (16). The indicator (16) is fastened to the annular groove at the upper end of the pull rod (12) by the deformation clip.

9. A gas self-closing valve according to claim 6, characterized in that, The housing (1) is fixedly provided with a limiting plate (7), and the limiting plate (7) is provided with a limiting hole. The inclined block (5) slides through the limiting hole on the limiting plate (7). The magnetic bolt (6) is threadedly connected to the inclined block (5) from the top of the limiting plate (7). The push rod (4) is slidably connected to the inclined block (5) from the bottom of the limiting plate (7).

10. A gas self-closing valve according to claim 6, characterized in that, An overcurrent differential pressure sensor (2) is installed at the air passage opening of the housing (1).

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