CN220688047U - Gas self-closing valve super-under-pressure magnetic attraction closing structure and gas self-closing valve - Google Patents

Abstract

The utility model belongs to the technical field of gas switches, and relates to a gas self-closing valve super-under-pressure magnetic attraction closing structure, which comprises the following components: the oblique block, the magnet bolt, the magnet and the pull rod; the utility model changes the inner hole of the magnet into a cylindrical hole, eliminates the counter-sunk hole at the upper end of the inner hole of the magnet, reduces the processing procedure and difficulty of the magnet, improves the production efficiency, does not cut or grind the magnet, does not damage the magnetism of the magnet, and causes unnecessary magnet assembly stress when the gas self-closing valve is installed or used in the later stage.

Description

Gas self-closing valve super-under-pressure magnetic attraction closing structure and gas self-closing valve

Technical Field

The utility model belongs to the technical field of gas switches, and relates to a gas self-closing valve and an ultra-under-pressure magnetic attraction closing structure thereof.

Background

The pipeline gas self-closing valve is a safety valve which is unique in China and is mainly used for preventing natural gas safety accidents in residential homes. The valve monitors and judges the gas pressure and flow parameters and drives the gas channel to be closed, so that the valve is simple, safe and reliable, and is widely applied in recent years.

The existing self-closing valve magnetic attraction structure has the following problems: the middle part of the magnet is provided with a conical counter bore so that a screw head can press the fixed magnet, on one hand, the conical counter bore of the magnet needs to be manually machined one by one, high-quality and high-efficiency production is difficult to form, and on the other hand, the assembly stress of the magnet can be caused, so that the magnet is damaged in use, and the safety function of a product is invalid; the bottom of the pull rod is directly contacted with the magnet, and the magnet is impacted when the overpressure is released and re-absorbed, so that the magnet is broken and loses the original shape, and the safety function of the product is invalid.

Therefore, a magnetic structure which is simpler and more convenient to produce and manufacture and safer and more reliable in use is needed to solve the technical problem.

Disclosure of Invention

The technical scheme adopted for solving the technical problems is as follows: a kind of fuel gas self-closing valve surpasses the under-voltage magnetism and attracts the closing structure, including: the gas self-closing valve comprises an inclined block, a magnet bolt, a magnet and a pull rod, wherein the inclined block is used for converting up-and-down motion into left-and-right motion of a push rod in the gas self-closing valve, the pull rod is used for moving up and down together with the inclined block under the suction action of the magnet, and a cylindrical first through hole is formed in an inner core of the magnet; the first through hole in the middle of the magnet is a cylindrical straight hole, a conical counter bore is not processed at the top of the first through hole, the processing procedure 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, and unnecessary magnet assembly stress is not caused during later installation and use;

the outer side wall of the magnet is sleeved with a groove-shaped magnet sleeve, the axial thickness of the magnet is smaller than the groove depth of the inner groove of the magnet sleeve, the bottom of the magnet sleeve is provided with a second through hole, and a magnet bolt sequentially penetrates through the first through hole and the second through hole from top to bottom and is then connected with the upper part of the inclined block through threads; the magnet sleeve is made of elastic nonmetallic materials, the axial thickness of the magnet is smaller than the groove depth of the inner groove of the magnet sleeve, so that 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 pressed down by magnetic attraction, the bottom of the pull rod impacts or impacts the upper edge of the magnet sleeve instead of impacting or impacting the magnet, the possibility of impacting sparks when the pull rod is attracted by the magnetic force is avoided, the safety of a gas valve and a user is facilitated, meanwhile, the pull rod does not impact or impact the magnet when the pull rod is attracted by the magnetic force, the possibility of damage of the magnet after long-term impact is avoided, the service life of the magnet is prolonged, and the service life of the gas valve is prolonged;

the magnet bolt is a countersunk bolt, a check ring is sleeved at the root of a screw rod of the magnet bolt, when the magnet bolt is in threaded connection with the inclined block, the magnet bolt compresses the inner ring of the check ring, and the outer ring of the check ring compresses the magnet at the bottom of the magnet sleeve from top to bottom; the check ring is used for pressing the magnet at the bottom of the magnet sleeve, and can play the roles of isolation and primary vibration prevention.

Preferably, the magnet is cylindrical, and the magnet sleeve is circular groove-shaped; the cylindrical magnet and the circular groove-shaped magnet sleeve are easier to process and more reliable in matching and clamping.

More preferably, the retainer ring is a circular and conical magnet pressing plate which is penetrated along the axial direction, the magnet pressing plate is provided with a third through hole along the axial direction, the third through hole, the magnet pressing plate and the magnet are coaxial with the rotating shaft, and after the magnet bolt passes through the magnet pressing plate to press the magnet, the bolt head of the magnet bolt is settled in the conical lower groove of the magnet pressing plate; the bottom surface of the pull rod is tightly pressed on the upper surface of the magnet pressing plate; the outer conical surface at the bottom of the magnet pressing plate is positioned in the first through hole of the magnet, and the outer circular surface at the bottom of the magnet pressing plate is pressed downwards at the upper surface of the magnet; the bottom of pull rod can be set up to the annular platform form of downward bulge, and the lower bulge loop platform of pull rod compresses tightly at the upper surface of magnet clamp plate, consequently the bottom of pull rod does not directly contact magnet and magnet bolt, if the magnet clamp plate adopts non-metallic elastic material to make, keep contacting with the elastic contact of lower part magnetism structure and non-metallic conductor when the pull rod receives magnetic force actuation pushing down, has reduced the possibility of striking, has still further reduced the possibility that produces striking spark simultaneously.

More preferably, an elastic gasket is arranged between the bottom of the magnet pressing plate and the upper part of the magnet; the elastic gasket enables the rigid contact between the magnet pressing plate and the magnet to be changed into elastic contact, so that the impact is reduced, and the safety and reliability are improved.

More preferably, the magnet sleeve is internally and fixedly provided with an inner cylinder coaxial with the magnet sleeve, the retainer ring is an inner cylinder of the magnet sleeve, the inner cylinder of the magnet sleeve is made of elastic nonmetallic materials, 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 aperture of the first through hole of the magnet, the outer diameter of the bolt head of the magnet bolt is larger than the outer diameter of the inner cylinder, and the bottom of the pull rod is tightly pressed at the top of the bolt head of the magnet bolt; the lower convex ring table of the pull rod is tightly pressed on the upper edge of the outer ring of the magnet sleeve, and the table bottom of the lower convex ring table of the pull rod is tightly pressed on the top of the bolt head of the magnet bolt; when the magnet bolt is screwed down, the outer diameter of the bolt head of the magnet bolt is large, the outer diameter of the inner barrel is small with the aperture of the first through hole of the magnet, so that the bolt head of the magnet bolt presses down the upper opening of the inner barrel of the magnet sleeve made of elastic materials and then deforms and expands along the radial direction, the upper opening of the inner barrel of the magnet sleeve deforms and then presses down the upper surface of the magnet, the magnet is pressed down on the bottom of the magnet sleeve, when the pull rod is pressed down by magnetic attraction, the bottom of the pull rod impacts or impacts on the upper edge of the magnet sleeve or the upper surface of the bolt head of the magnet, instead of impacting or impacting the magnet, the possibility that the pull rod directly impacts or impacts the magnet to generate impact sparks when the pull rod is attracted by the magnetic force is avoided, the safety of a gas valve and a user is facilitated, meanwhile, the possibility that the magnet is damaged after long-term impact is avoided, the service life of the magnet is prolonged, and the service life of the gas valve is prolonged.

The utility model also discloses a gas self-closing valve, which adopts the above gas self-closing valve super-under pressure magnetic attraction closing structure, and further comprises: the sealing device comprises a shell, a sealing ring, a push rod, a leather membrane and a leather membrane pressing plate, wherein an air channel is arranged in the shell, the push rod can reciprocate along the axial direction of the air channel, the sealing ring is fixed at one end of the push rod, and the air channel of the shell is closed or opened when the push rod drives the sealing ring to reciprocate; the inclined block is provided with an inclined groove which is connected with a small shaft bulge on the push rod in a sliding way; the magnet bolt passes through the magnet pressing plate, the magnet and the magnet sleeve and is connected with the inclined block into a whole, and can move up and down along the groove of the shell; the inclined block is provided with an inclined groove, and the push rod is provided with a small shaft bulge, so that the up-and-down motion of the inclined block can be converted into the left-and-right motion of the push rod; when the inclined block moves upwards, the push rod moves rightwards to drive the sealing ring to open the airflow channel of the shell; when the inclined block moves downwards, the push rod moves leftwards to drive the sealing ring to close the air flow passage of the shell;

the diaphragm is dish-shaped, an annular elastic deformation arc coaxial with the diaphragm is arranged on the diaphragm, the middle part of the diaphragm is fixedly connected with a pull rod, the outer circumference of the diaphragm is fixedly connected with a shell, the middle part of a diaphragm pressing plate is fixedly connected with the pull rod, the diaphragm pressing plate tightly presses the diaphragm at the lower end of the pull rod from top to bottom, and the pull rod, the diaphragm and the diaphragm pressing plate are coaxial with a rotating shaft; the leather diaphragm and the leather diaphragm pressing plate are used for generating recoverable elastic deformation when the pull rod rises or falls due to overpressure or underpressure in the shell, and when the pressure in the shell is recovered to be normal, the pull rod can be driven to recover to the original position by the elastic recovery original position of the leather diaphragm by external force so as to drive the push rod and the sealing ring to move along the axial direction, and the air channel in the shell is opened;

the upper end of the pull rod extends out of the shell from the upper cover; the upper end of the pull rod extends out of the shell and is used for pushing the pull rod to restore to the initial position by external force when the internal pressure of the shell returns to normal.

Preferably, the leather diaphragm pressing plate is tightly pressed at the middle part of the leather diaphragm from top to bottom, an elastic deformation arc of the leather diaphragm is positioned outside the circumferential edge of the leather diaphragm pressing plate, and radially distributed notch grooves are arranged on the leather diaphragm pressing plate; so that the plastic film is embedded and fixed on the pull rod through the deformation of the inner hole during assembly, and the plastic film is pressed on the pull rod.

Preferably, an indicator is arranged at the upper end of the pull rod, a deformation clamp is arranged on the indicator, and the indicator is buckled on the annular groove at the upper end of the pull rod through the deformation clamp; the position of the indicator indicates that the gas pressure in the cavity of the shell is normal, and the valve is in a normal opening working state.

Preferably, the inner cavity of the shell is fixedly provided with a limiting plate, the limiting plate is provided with a limiting hole, the inclined block slides through the limiting hole on the limiting plate, the magnet bolt is in threaded connection with the inclined block from the upper part of the limiting plate, and the push rod is in sliding connection with the inclined block from the lower part of the limiting plate; the limiting plate is fixed on the shell and forms a movement track of the inclined block together with the groove of the shell, and the inclined block is restrained to slide up and down in the vertical direction, so that the up-and-down movement of the pull rod is more effectively converted into the left-and-right movement of the push rod.

Preferably, an overcurrent differential pressure sensor is arranged at the gas path passage port of the shell, and the function of the overcurrent differential pressure sensor is to form a certain air flow pressure difference before and after the overcurrent differential pressure sensor so that a blocking plate in the overcurrent differential pressure sensor overcomes the spring force to close the air passage so as to ensure the sensitivity and reliability of the overcurrent closing function of the self-closing valve.

The beneficial effects of the utility model are as follows:

1. according to the utility model, the inner hole of the magnet is changed into the cylindrical hole, so that the counter bore at the upper end of the inner hole of the magnet is eliminated, the processing procedure and difficulty of the magnet are reduced, the production efficiency is improved, and meanwhile, the magnet is not cut or ground, the magnetism of the magnet is not damaged, and the gas self-closing valve is not subjected to unnecessary magnet assembly stress during later installation or use.

2. The bottom of the pull rod is not in direct contact with the magnet, so that the risk of magnet breakage failure caused by the fact that the pull rod impacts the magnet and the safety risk of sparks generated by impacting the magnet can be prevented when the pull rod is reset under overpressure, the pull rod keeps in elastic contact with the lower magnetic structure to be in contact with a nonmetallic conductor when being pressed down by magnetic attraction, the possibility of impact is reduced, the risk of magnet breakage failure caused by compressive stress when the magnet is assembled or used can be prevented, and meanwhile the possibility of sparks generated by impact is further reduced.

Drawings

FIG. 1 is a schematic diagram of a gas self-closing valve over-voltage and under-voltage magnetic attraction closing structure and a magnetic attraction closing structure of a gas self-closing valve with a magnet pressing plate;

FIG. 2 is an exploded schematic view of FIG. 1;

FIG. 3 is a schematic view of a magnetic closing structure without a magnet platen;

FIG. 4 is an exploded schematic view of FIG. 3;

FIG. 5 is a schematic diagram of a gas self-closing valve with a magnet platen;

FIG. 6 is an enlarged partial schematic view of the A-direction of FIG. 5;

FIG. 7 is a schematic illustration of a gas self-closing valve without a magnet platen;

FIG. 8 is an enlarged partial schematic view of FIG. 7 in the B direction;

FIG. 9 is a schematic illustration of a skin platen;

fig. 10 is a schematic view of an indicator.

In the figure: 1. a housing; 2. an overcurrent differential pressure sensor; 3. a seal ring; 4. a push rod; 5. a sloping block; 6. a magnet bolt; 7. a limiting plate; 8. limiting plate screws; 9. a magnet; 10. a magnet sleeve; 11. a magnet pressing plate; 12. a pull rod; 13. a coating film; 14. a film pressing plate; 15. lifting the reset handle; 16. an indicator; 17. a nameplate; 18. riveting rings; 19. an upper cover; 20. a return spring; 21. and (5) limiting the snap springs.

Detailed Description

The following description of the related art will be made apparent to, and is not intended to limit the scope of, the embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 10, a gas self-closing valve super-under pressure magnetic attraction closing structure includes: the gas self-closing valve comprises an inclined block 5, a magnet bolt 6, a magnet 9 and a pull rod 12, wherein the inclined block 5 is used for converting up-and-down motion into left-and-right motion of a push rod 4 in the gas self-closing valve, the pull rod 12 is used for moving up and down together with the inclined block 5 under the suction action of the magnet 9, and a cylindrical first through hole is formed in the inner core of the magnet 9; the first through hole in the middle of the magnet 9 is a cylindrical straight hole, a conical counter bore is not processed at the top of the first through hole, the processing procedure and difficulty of the magnet 9 are reduced, the production efficiency is improved, the magnet 9 is not cut or ground, the magnetism of the magnet 9 is not damaged, and unnecessary magnet assembly stress is not caused during later installation and use;

the outer side wall of the magnet 9 is sleeved with a groove-shaped magnet sleeve 10, the axial thickness of the magnet 9 is smaller than the groove depth of the inner groove of the magnet sleeve 10, the bottom of the magnet sleeve 10 is provided with a second through hole, and the magnet bolt 6 sequentially passes through the first through hole and the second through hole from top to bottom and is then connected with the upper part of the inclined block 5 through threads; the magnet sleeve 10 is made of elastic nonmetallic materials, the axial thickness of the magnet 9 is smaller than the groove depth of the inner groove of the magnet sleeve 10, so that when the magnet 9 is installed in the groove of the magnet sleeve 10, the upper surface of the magnet 9 is lower than the upper edge of the magnet sleeve 10, when the pull rod 12 is pressed down by magnetic attraction, the bottom of the pull rod 12 impacts or impacts the upper edge of the magnet sleeve 10 instead of impacting or impacting the magnet 9, the possibility of impacting sparks generated when the pull rod 12 is attracted by the magnetic force is avoided, the safety of a gas valve and a user is facilitated, meanwhile, the pull rod 12 does not impact or impact the magnet 9 when the pull rod 12 is attracted by the magnetic force, the possibility of destroying the magnet 9 after long-term impact is avoided, the service life of the magnet 9 is prolonged, and the service life of the gas valve is prolonged;

the magnet bolt 6 is a countersunk bolt, a check ring is sleeved at the root of a screw rod of the magnet bolt 6, when the magnet bolt 6 is in threaded connection with the inclined block 5, the magnet bolt 6 compresses an inner ring of the check ring, and an outer ring of the check ring compresses a magnet 9 at the bottom of the magnet sleeve 10 from top to bottom; the check ring is used for pressing the magnet 9 at the bottom of the magnet sleeve 10, and can play the roles of isolation and primary vibration prevention.

Further, the magnet 9 is cylindrical, and the magnet sleeve 10 is circular groove; the cylindrical magnet 9 and the circular groove-shaped magnet sleeve 10 are easier to process and more reliable in matching and clamping.

Furthermore, the retainer ring is a circular and conical magnet pressing plate 11 which is penetrated along the axial direction, the magnet pressing plate 11 is provided with a third through hole along the axial direction, the third through hole, the magnet pressing plate 11 and the magnet 9 are coaxial with a rotating shaft, and after the magnet bolt 6 passes through the magnet pressing plate 11 to press the magnet 9, the bolt head of the magnet bolt 6 is settled in the conical lower groove of the magnet pressing plate 11; the bottom surface of the pull rod 12 is pressed on the upper surface of the magnet pressing plate 11; the outer conical surface at the bottom of the magnet pressing plate 11 is positioned in the first through hole of the magnet 9, and the outer circular surface at the bottom of the magnet pressing plate 11 is pressed downwards at the upper surface of the magnet 9; the bottom of the pull rod 12 can be arranged to be a ring table protruding downwards, and the lower convex ring table of the pull rod 12 is tightly pressed on the upper surface of the magnet pressing plate 11, so that the bottom of the pull rod 12 is not in direct contact with the magnet 9 and the magnet bolt 6, if the magnet pressing plate 11 is made of a nonmetallic elastic material, the pull rod 12 keeps in contact with the nonmetallic conductor with elastic contact with the lower magnetic structure when being pressed downwards by magnetic attraction, the possibility of impact is reduced, and meanwhile, the possibility of impact spark is further reduced.

Further, an elastic gasket is arranged between the bottom of the magnet pressing plate 11 and the upper part of the magnet 9; the elastic gasket enables the rigid contact between the magnet pressing plate 11 and the magnet 9 to be changed into elastic contact, so that the impact is reduced, and the safety and reliability are improved.

Further, an inner cylinder coaxial with the magnet sleeve 10 is fixedly arranged in the magnet sleeve 10, the retainer ring is an inner cylinder of the magnet sleeve 10, the inner cylinder of the magnet sleeve 10 is made of elastic nonmetallic materials, 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 aperture 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, and the bottom of the pull rod 12 is pressed on the top of the bolt head of the magnet bolt 6; the lower convex ring table of the pull rod 12 is tightly pressed on the upper edge of the outer ring of the magnet sleeve 10, and the table bottom of the lower convex ring table of the pull rod 12 is tightly pressed on the top of the bolt head of the magnet bolt 6; when the magnet bolt 6 is screwed down to 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 barrel is small with the aperture of the first through hole of the magnet 9, the bolt head of the magnet bolt 6 presses down the upper opening of the inner barrel of the magnet sleeve 10 made of elastic materials and then deforms and expands along the radial direction, so that the upper opening of the inner barrel of the magnet sleeve 10 deforms and then presses down the upper surface of the magnet 9, the magnet 9 is pressed down on the bottom of the magnet sleeve 10, when the pull rod 12 is pressed down by magnetic attraction, the bottom of the pull rod 12 is impacted or impacted on the upper edge of the magnet sleeve 10 or the upper surface of the bolt head of the magnet bolt 6, instead of impacting or impacting the magnet 9, the possibility that the pull rod 12 directly impacts or impacts the magnet 9 when the pull rod 12 is attracted by magnetic attraction is avoided, the safety of a gas valve and a user is facilitated, meanwhile, the possibility that the magnet 9 is not impacted or impacted when the pull rod 12 is attracted by magnetic attraction for a long time is avoided, the possibility that the magnet 9 is damaged after long-term impact is avoided, and the service life of the gas valve is prolonged.

The utility model also discloses a gas self-closing valve, which adopts the above gas self-closing valve super-under pressure magnetic attraction closing structure, and further comprises: the sealing device comprises a shell 1, a sealing ring 3, a push rod 4, a leather membrane 13 and a leather membrane pressing plate 14, wherein an air channel is arranged in the shell 1, the push rod 4 can reciprocate along the axial direction of the air channel, the sealing ring 3 is fixed at one end of the push rod 4, and the air channel of the shell 1 is closed or opened when the push rod 4 drives the sealing ring 3 to reciprocate; the inclined block 5 is provided with an inclined groove, and the inclined groove of the inclined block 5 is connected with a small shaft bulge on the push rod 4 in a sliding manner; the magnet bolt 6 passes through the magnet pressing plate 11, the magnet 9 and the magnet sleeve 10 and is connected with the inclined block 5 into a whole, and can move up and down along the groove of the shell 1; the inclined block 5 is provided with an inclined groove, and the push rod 4 is provided with a small shaft bulge, so that the up-and-down motion of the inclined block 5 can be converted into the left-and-right motion of the push rod 4; when the inclined block 5 moves upwards, the push rod 4 moves rightwards to drive the sealing ring 3 to open an airflow channel of the shell 1; when the inclined block 5 moves downwards, the push rod 4 moves leftwards to drive the sealing ring 3 to close the air flow passage of the shell;

the leather diaphragm 13 is dish-shaped, an annular elastic deformation arc coaxial with the leather diaphragm 13 is arranged on the leather diaphragm 13, the middle part of the leather diaphragm 13 is fixedly connected with the pull rod 12, the outer circumference of the leather diaphragm 13 is fixedly connected with the shell 1, the middle part of the leather diaphragm pressing plate 14 is fixedly connected with the pull rod 12, the leather diaphragm pressing plate 14 presses the leather diaphragm 13 at the lower end of the pull rod 12 from top to bottom, and the pull rod 12, the leather diaphragm 13 and the leather diaphragm pressing plate 14 are coaxial with a rotating shaft; the film 13 and the film pressing plate 14 are used for generating recoverable elastic deformation when the pull rod 12 rises or falls due to overpressure or underpressure in the shell 1, when the pressure in the shell 1 is recovered to be normal, external force pushes the pull rod 12, and the pull rod 12 can be driven to recover to the initial position by the elastic recovery initial position of the film 13 so as to drive the push rod 4 and the sealing ring 3 to axially move, and an air channel in the shell 1 is opened;

the upper end of the pull rod 12 extends out of the shell 1 from the upper cover 19; the upper end of the pull rod 12 extends out of the shell 1, and is used for pushing the pull rod 12 to restore to the initial position by external force when the internal pressure of the shell 1 is restored to be normal.

Further, the film pressing plate 14 is pressed at the middle part of the film 13 from top to bottom, the elastic deformation arc of the film 13 is positioned outside the circumferential edge of the film pressing plate 14, and the film pressing plate 14 is provided with radial notch grooves; so as to be embedded and fixed on the pull rod 12 through the deformation of the inner hole during assembly, and the film 13 is pressed on the pull rod 12.

Further, an indicator 16 is arranged at the upper end of the pull rod 12, a deformation clamp is arranged on the indicator 16, and the indicator 16 is buckled on a ring groove at the upper end of the pull rod 12 through the deformation clamp; the normal pressure of the air in the cavity of the shell 1 is indicated by the position of the indicator 16, and the valve is in a normal open working state.

Further, a limiting plate 7 is fixedly arranged in the inner cavity of the shell 1, a limiting hole is formed in the limiting plate 7, the inclined block 5 slides through the limiting hole in the limiting plate 7, the magnet bolt 6 is in threaded connection with the inclined block 5 from the upper side of the limiting plate 7, and the push rod 4 is in sliding connection with the inclined block 5 from the lower side of the limiting plate 7; the limiting plate 7 is fixed on the shell 1 and forms a movement track of the inclined block 5 together with the groove of the shell 1, and the inclined block 5 is restrained to slide up and down only in the vertical direction, so that the up-and-down movement of the pull rod 12 is more effectively converted into the left-and-right movement of the push rod 4.

Further, an overcurrent differential pressure sensor 2 is arranged at the gas path port of the shell 1; the function of the valve is that a certain air flow pressure difference is formed in the front and the back of the valve, so that a blocking plate in the flow differential pressure sensor 2 overcomes the spring force to close the air passage, and the sensitivity and reliability of the overcurrent closing function of the self-closing valve are ensured.

Examples

Embodiment one: referring to fig. 5 to 6, the magnetic attraction closing structure for super-low pressure of the pipeline gas self-closing valve provided by the embodiment includes: the device comprises a shell 1, an overcurrent differential pressure sensor 2, a sealing ring 3, a push rod 4, an inclined block 5, a magnet bolt 6, a limiting plate 7, a limiting plate screw 8, a magnet 9, a magnet sleeve 10, a magnet pressing plate 11, a pull rod 12, a coating 13, a coating pressing plate 14, a lifting reset handle 15, an indicator 16, a nameplate 17, a riveting ring 18 and an upper cover 19.

The magnet pressing plate 11 is provided with a third through hole along the axial direction, the third through hole, the magnet pressing plate 11 and the magnet 9 are coaxial with the rotating shaft, and after the magnet bolt 6 passes through the magnet pressing plate 11 to press the magnet 9, the bolt head of the magnet bolt 6 is settled in the conical lower groove of the magnet pressing plate 11; the bottom surface of the pull rod 12 is pressed on the upper surface of the magnet pressing plate 11; the outer conical surface at the bottom of the magnet pressing plate 11 is positioned in the first through hole of the magnet 9, and the outer circular surface at the bottom of the magnet pressing plate 11 is pressed downwards at the upper surface of the magnet 9; the bottom of the pull rod 12 can be arranged to be a ring table protruding downwards, and the lower convex ring table of the pull rod 12 is tightly pressed on the upper surface of the magnet pressing plate 11, so that the bottom of the pull rod 12 is not in direct contact with the magnet 9 and the magnet bolt 6, if the magnet pressing plate 11 is made of a nonmetallic elastic material, the pull rod 12 keeps in contact with the nonmetallic conductor with elastic contact with the lower magnetic structure when being pressed downwards by magnetic attraction, the possibility of impact is reduced, and meanwhile, the possibility of impact spark is further reduced.

The pipeline gas self-closing valve assembled by the magnetic attraction closing structure with the magnet pressing plate 11 can be used for closing the gas flow channel of the shell 1 when moving leftwards and opening the gas flow channel of the shell 1 when moving rightwards, and the sealing ring 3 is fixed at one end of the push rod 4 and can axially move along the gas channel of the shell 1 along with the push rod 4.

The magnet bolt 6 passes through the magnet pressing plate 11, the magnet 9 and the magnet sleeve 10 and is connected with the inclined block 5 into a whole, and can move up and down along the groove of the shell 1 and the middle hole of the limiting plate 7; the inclined block 5 is provided with an inclined groove, and the push rod 4 is provided with a small protruding shaft, so that the up-and-down motion of the inclined block 5 can be converted into the left-and-right motion of the push rod 4; when the inclined block 5 moves upwards, the push rod 4 moves rightwards to drive the sealing ring 3 to open the air flow channel of the shell 1; when the inclined block 5 moves downwards, the push rod 4 moves leftwards, and the sealing ring 3 is driven to close the air flow passage of the shell 1.

The limiting plate 7 is fixed on the shell 1 through a limiting plate screw 8 and forms a moving track of the inclined block 5 together with a groove of the shell 1.

The inner hole of the leather diaphragm pressing plate 14 is circumferentially provided with uniformly distributed notch grooves, as shown in fig. 5, so that the leather diaphragm pressing plate is embedded and fixed in the annular groove of the pull rod 12 through inner hole deformation during assembly, and the leather diaphragm 13 is pressed on the pull rod 12; the circumference of the inner hole of the indicator 16 is provided with uniformly distributed notch grooves, as shown in fig. 9, so that the indicator 16 is embedded in the ring groove of the pull rod 12 through the deformation of the inner hole during assembly, the nameplate 17 is embedded in the groove of the indicator 16, and the parts and the pull rod 12 are connected into a whole to move up and down along with the pull rod 12;

under the suction action of the magnet 9, the pull rod 12 is adsorbed with the magnet 9 when the gas pressure in the cavity of the shell 1 is normal or insufficient, and moves up and down together with the inclined block 5; when the gas pressure in the cavity of the shell 1 is normal, the magnet 9 overcomes the suction force of the limiting plate 7 and is far away from the limiting plate 7, the push rod 4 and the sealing ring 3 are driven by the inclined block 5 to open the air flow channel of the shell 1, the normal clearance between the indicator 16 and the lifting reset handle 15 indicates that the gas pressure in the cavity of the shell 1 is normal, and the valve is in a normal opening working state; when the gas pressure in the cavity of the shell 1 is insufficient, the magnet 9 is attracted to the limiting plate 7, the push rod 4 and the sealing ring 3 are driven by the inclined block 5 to close the air flow channel of the shell 1, and no gap is formed between the indicator 16 and the lifting reset handle 15 to indicate that the cavity of the shell 1 is under-pressure; when the gas pressure in the cavity of the shell 1 is ultrahigh, the magnet 9 is separated from the pull rod 12, the pull rod 12 and accessory parts on the pull rod move upwards to an upper limit position under the action of the gas pressure, the indicator 16 is obviously higher, an excessive gap between the pull rod 12 and the lifting reset handle 15 indicates that the cavity of the shell 1 is overpressurized, and meanwhile, the magnet 9 overcomes the suction force of the pull rod 12 to move downwards and is attracted with the limiting plate 7, and the push rod 4 and the sealing ring 3 are driven by the inclined block 5 to close the airflow channel of the shell 1. In the pipeline gas self-closing valve, the counter sunk hole at the upper end of the inner hole of the magnet 9 is eliminated, so that the production efficiency is higher, the cost is lower, and the magnetism of the magnet is better; the pull rod 12 does not directly impact or strike the magnet 9, so the pipeline gas self-closing valve is safer and more reliable to use and longer in service life.

Embodiment two: in this embodiment, except for the ultra-low pressure magnetic attraction closing structure of the gas self-closing valve, the rest parts are the same as those of the first embodiment, referring to fig. 7 to 8, an inner cylinder coaxial with the magnet sleeve 10 is fixedly arranged in the magnet sleeve 10, a retainer ring is an inner cylinder of the magnet sleeve 10, the inner cylinder of the magnet sleeve 10 is made of elastic nonmetallic materials, 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 aperture of a 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, and the bottom of the pull rod 12 is pressed on the top of the bolt head of the magnet bolt 6; the lower convex ring table of the pull rod 12 is tightly pressed on the upper edge of the outer ring of the magnet sleeve 10, and the table bottom of the lower convex ring table of the pull rod 12 is tightly pressed on the top of the bolt head of the magnet bolt 6; when the magnet bolt 6 is screwed down to 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 barrel is small with the aperture of the first through hole of the magnet 9, the bolt head of the magnet bolt 6 presses down the upper opening of the inner barrel of the magnet sleeve 10 made of elastic materials and then deforms and expands along the radial direction, so that the upper opening of the inner barrel of the magnet sleeve 10 deforms and then presses down the upper surface of the magnet 9, the magnet 9 is pressed down on the bottom of the magnet sleeve 10, when the pull rod 12 is pressed down by magnetic attraction, the bottom of the pull rod 12 is impacted or impacted on the upper edge of the magnet sleeve 10 or the upper surface of the bolt head of the magnet bolt 6, instead of impacting or impacting the magnet 9, the possibility that the pull rod 12 directly impacts or impacts the magnet 9 when the pull rod 12 is attracted by magnetic attraction is avoided, the safety of a gas valve and a user is facilitated, meanwhile, the possibility that the pull rod 12 is not impacted or impacted on the magnet 9 when the pull rod 12 is attracted by magnetic attraction for a long time is avoided, the possibility that the magnet 9 is damaged after long-term impact is avoided, and the service life of the magnet 9 is prolonged. In this embodiment, the rest of the gas self-closing valve is the same as that of the first embodiment, so that the counter bore at the upper end of the inner bore of the magnet 9 is also eliminated in the gas self-closing valve of this embodiment, thus the production efficiency is higher, the cost is lower, and the magnetism of the magnet is better; the pull rod 12 does not directly impact or strike the magnet 9, so the pipeline gas self-closing valve is safer and more reliable to use and longer in service life.

With the present embodiment, it is possible to realize: the magnet 9 is not provided with a countersunk hole, which is beneficial to improving the quality and the production efficiency of products, so as to accelerate the popularization and the application of the pipeline gas self-closing valve products and protect the personal and property safety of people; the magnet 9 is not in direct contact with the pull rod 12, so that the quality risk that the pull rod 12 impacts the magnet 9 to cause the breakage failure of the magnet 9 when the overpressure is reset can be prevented, and the safety risk that sparks are generated when the magnet 9 is impacted; the magnet bolt 6 is not in direct contact with the magnet 9, so that the quality risk of breakage failure of the magnet 9 caused by compressive stress of the magnet 9 during assembly can be prevented.

In summary, the utility model changes the inner hole of the magnet into the cylindrical hole, removes the countersunk hole at the upper end of the inner hole of the magnet, reduces the processing procedure and difficulty of the magnet, improves the production efficiency, does not cut or grind the magnet, does not damage the magnetism of the magnet, and causes unnecessary magnet assembly stress when the gas self-closing valve is installed or used in the later stage.

It is emphasized that: the above embodiments are merely preferred embodiments of the present utility model, and the present utility model is not limited in any way, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims (10)

1. A kind of fuel gas self-closing valve surpasses the under-voltage magnetism and attracts the closing structure, including: the gas self-closing valve comprises an inclined block (5), a magnet bolt (6), a magnet (9) and a pull rod (12), wherein the inclined block (5) is used for converting up-and-down motion into left-and-right motion of a push rod (4) in the gas self-closing valve, and the pull rod (12) is used for moving up and down together with the inclined block (5) under the suction effect of the magnet (9), and is characterized in that a cylindrical first through hole is formed in an inner core of the magnet (9);

the outer side wall of the magnet (9) is sleeved with a groove-shaped magnet sleeve (10), the axial thickness of the magnet (9) is smaller than the groove depth of the inner groove of the magnet sleeve (10), a second through hole is formed in the groove bottom of the magnet sleeve (10), and the magnet bolt (6) sequentially penetrates through the first through hole and the second through hole from top to bottom and then is in threaded connection with the upper part of the inclined block (5);

the magnet bolt (6) is a countersunk bolt, a check ring is sleeved at the root of a screw rod of the magnet bolt (6), when the magnet bolt (6) is in threaded connection with the inclined block (5), the magnet bolt (6) compresses the inner ring of the check ring, and the outer ring of the check ring compresses the magnet (9) from top to bottom at the bottom of the magnet sleeve (10).

2. The gas self-closing valve ultra-low pressure magnetic attraction closing structure according to claim 1, wherein the magnet (9) is cylindrical, and the magnet sleeve (10) is circular groove-shaped.

3. The gas self-closing valve super-under-pressure magnetic attraction closing structure according to claim 2, wherein the retainer ring is a circular and conical magnet pressing plate (11) which is penetrated along the axial direction, the magnet pressing plate (11) is provided with a third through hole along the axial direction, the third through hole, the magnet pressing plate (11) and the magnet (9) are coaxial with a rotating shaft, and after the magnet bolt (6) passes through the magnet pressing plate (11) to press the magnet (9), the bolt head of the magnet bolt (6) is settled in a conical lower groove of the magnet pressing plate (11); the bottom surface of the pull rod (12) is pressed on the upper surface of the magnet pressing plate (11).

4. The gas self-closing valve super-under pressure magnetic attraction closing structure according to claim 3, wherein an elastic gasket is arranged between the bottom of the magnet pressing plate (11) and the upper part of the magnet (9).

5. The gas self-closing valve super-under-pressure magnetic attraction closing structure according to claim 2, wherein an inner cylinder coaxial with the magnet sleeve (10) is fixedly arranged in the magnet sleeve (10), the retainer ring is an inner cylinder of the magnet sleeve (10), the inner cylinder of the magnet sleeve (10) is made of elastic nonmetallic materials, the upper edge of the inner cylinder is higher than the upper edge of an outer ring of the magnet sleeve (10), the outer diameter of the inner cylinder is the same as the aperture of a first through hole of the magnet (9), the outer diameter of a bolt head of the magnet bolt (6) is larger than the outer diameter of the inner cylinder, and the bottom of the pull rod (12) is pressed at 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 super-under pressure magnetic attraction closing structure according to any one of claims 1 to 5, and the gas self-closing valve further comprises: the sealing device comprises a shell (1), a sealing ring (3), a push rod (4), a coating (13) and a coating pressing plate (14), wherein an air passage is formed in the shell (1), the push rod (4) can reciprocate along the axial direction of the air passage, the sealing ring (3) is fixed at one end of the push rod (4), and the push rod (4) drives the sealing ring (3) to close or open the air passage of the shell (1) when in reciprocating motion;

the inclined block (5) is provided with an inclined groove, and the inclined groove of the inclined block (5) is connected with a small shaft bulge on the push rod (4) in a sliding manner;

the film (13) is dish-shaped, an annular elastic deformation arc coaxial with the film (13) is arranged on the film (13), a pull rod (12) is fixedly connected to the middle of the film (13), a shell (1) is fixedly connected to the outer circumference of the film (13), a pull rod (12) is fixedly connected to the middle of a film pressing plate (14), the film pressing plate (14) tightly presses the film (13) at the lower end of the pull rod (12) from top to bottom, and the pull rod (12), the film (13) and the film pressing plate (14) are coaxial with a rotating shaft;

the upper end of the pull rod (12) extends out of the shell (1) from the upper cover (19).

7. The gas self-closing valve according to claim 6, wherein the film pressing plate (14) is disc-shaped, the film pressing plate (14) is pressed at the middle part of the film (13) from top to bottom, an elastic deformation arc of the film (13) is located outside the circumferential edge of the film pressing plate (14), and radial-distributed notch grooves are formed in the film pressing plate (14) in the radial direction.

8. The gas self-closing valve according to claim 6, wherein an indicator (16) is arranged at the upper end of the pull rod (12), a deformation clamp is arranged on the indicator (16), and the indicator (16) is clamped on a ring groove at the upper end of the pull rod (12) through the deformation clamp.

9. The gas self-closing valve according to claim 6, wherein a limiting plate (7) is fixedly arranged in the inner cavity of the shell (1), a limiting hole is formed in the limiting plate (7), the inclined block (5) slides through the limiting hole in the limiting plate (7), the magnet bolt (6) is connected with the inclined block (5) from the upper side of the limiting plate (7) in a threaded mode, and the push rod (4) is connected with the inclined block (5) from the lower side of the limiting plate (7) in a sliding mode.

10. The gas self-closing valve according to claim 6, wherein an overcurrent differential pressure sensor (2) is arranged at a gas passage port of the shell (1).