CN110630746A - Take automatic shutdown protection to prevent leaking mechanical seal - Google Patents
Take automatic shutdown protection to prevent leaking mechanical seal Download PDFInfo
- Publication number
- CN110630746A CN110630746A CN201910909968.9A CN201910909968A CN110630746A CN 110630746 A CN110630746 A CN 110630746A CN 201910909968 A CN201910909968 A CN 201910909968A CN 110630746 A CN110630746 A CN 110630746A
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- ring
- piston
- shell
- mechanical seal
- static ring
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- 230000003068 static effect Effects 0.000 claims abstract description 73
- 238000009826 distribution Methods 0.000 claims abstract description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- 238000007789 sealing Methods 0.000 abstract description 65
- 230000000694 effects Effects 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 description 27
- 238000005299 abrasion Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000010354 integration Effects 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
- F16J15/3444—Pressing means by magnetic attraction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
- F16J15/346—Pressing means the pressing force varying during operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3492—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member with monitoring or measuring means associated with the seal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/38—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member sealed by a packing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Sealing Devices (AREA)
Abstract
The invention discloses a leakage-proof mechanical seal with automatic shutdown protection, which comprises a movable ring, a shell, a static ring assembly, an auxiliary compensation assembly and a shaft sleeve, wherein the static ring assembly is arranged in the shell, the movable ring is connected to a main shaft and rotates together to abut against the static ring assembly to form a rotary sealing surface, the auxiliary compensation assembly is arranged in the shell and is positioned at the back of the static ring assembly, the auxiliary compensation assembly generates suction force on the static ring assembly to reduce the pretightening force on the sealing surface of the movable ring and the static ring, and the movable ring is arranged on the shaft sleeve. The contact force of the sealing surface of the dynamic and static rings is adjusted by using the auxiliary compensation assembly, so that the contact force is associated with the rotating speed of the main shaft, when the rotating speed of the main shaft is higher, the contact force is reduced to prevent the friction power from being greatly increased, when the rotating speed is lower, the sealing surface has larger contact force so as to be sealed and reliable, and larger sealing force is provided to prevent leakage when the machine is stopped. The mechanical seal main body part is used in series, and the pressure distribution cylinder is used for connecting the two seal cavities, so that the effect of distributing medium pressure is achieved.
Description
Technical Field
The invention relates to the field of mechanical seal, in particular to a leakage-proof mechanical seal with automatic shutdown protection.
Background
The mechanical seal is a dynamic seal which is more and more widely used, and is generally applied to a penetrating part of a rotating shaft extending out of a machine from a shell of the machine, and because a main shaft is a rotating part and a machine shell is a static part, a gap is necessarily formed, and if the main shaft is not sealed, a medium in the machine leaks out from the gap, which is avoided in most cases.
Mechanical seal forms the contact surface that has relative motion through quiet ring and rotating ring and seals, and among the prior art, the back of finishing the installation, the pretightning force of contradicting each other between the sound ring is unchangeable almost, when the main shaft rotational speed is higher, frictional power is great, sealed face generates heat seriously, the machine seals life-span and reduces, and in order to prevent the emergence of this condition, original pretightning force probably is allocated lowly, but when shutting down, some must rotate on the sealed face just sealing force that has can lose, and then the medium in the machine squeezes open sealed face and reveals to the external world.
The machine seal in the prior art can not adjust the pretightening force of the sealing surface according to the rotating speed of the main shaft and the pressure of a medium.
Disclosure of Invention
The invention aims to provide a leakage-proof mechanical seal with automatic shutdown protection, which is used for solving the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a take automatic shutdown protection prevent leaking mechanical seal, includes rotating ring, shell, quiet ring subassembly and auxiliary compensation subassembly, and quiet ring subassembly sets up in the shell, and the rotating ring is connected to on the main shaft together rotatory and quiet ring subassembly counterbalance and leans on and form rotary seal face, and auxiliary compensation subassembly sets up in the shell, is located at quiet ring subassembly back, and auxiliary compensation subassembly produces suction to quiet ring subassembly and makes the pretightning force reduce on the quiet ring seal face.
The mechanical seal is arranged on the main shaft and the casing, wherein a rotating part is arranged on the main shaft and comprises a movable ring, and the other non-rotating parts are arranged on the casing or indirectly arranged on the casing and are locked by fasteners such as bolts, screws and the like. The dynamic ring is connected to the main shaft and rotates along with the main shaft, the dynamic ring and the static ring component form a rotating contact surface, the surface of the rotating contact surface is very smooth, a dynamic sealing surface is formed by static and dynamic, and the steps like the material selection of the sealing surface and the like are the same as the mechanical sealing in the prior art, for example, a medium containing micro particles is used for a hard-to-hard sealing surface, and a hard-to-soft sealing surface is used in a low-temperature clear water occasion.
The shell is a mechanical seal appearance, can replace parts such as a seal gland and the like, and can be used only by arranging corresponding connecting holes at the connecting position.
According to the invention, one auxiliary compensation assembly is additionally arranged, the compensation ring of the mechanical seal is selected as the static ring assembly, the static ring assembly is used as an axial floating compensation part, and the auxiliary compensation assembly can adjust the pressing force of the static ring assembly to the moving ring according to the rotating speed of the main shaft, so that the heating value and the sealing clearance of the sealing surface are improved, and the sealing force matched with the working condition is obtained. When the mechanical seal is used in a low-rotating-speed situation, the pretightening force of the dynamic and static seal surfaces can be larger, and even if the pretightening force is larger, great abrasion can not occur, so that the pretightening force is large, and the seal is reliable.
Furthermore, the leakage-proof mechanical seal also comprises a shaft sleeve, and the movable ring is arranged on the shaft sleeve. The shaft sleeve increases the packaging property of the invention, when in use, the shaft sleeve is only required to be sleeved on the main shaft and then locked by the fastening screw on the surface of the shaft sleeve exposed out of the shell, the installation is more convenient, if no shaft sleeve is provided, the installation of the movable ring is more troublesome, and the pretightening force on the static ring component is not well adjusted.
Furthermore, the static ring assembly comprises a static ring, an elastic body and a static ring magnet, the static ring is arranged in the shell, one end of the elastic body abuts against the inner wall of the shell, one end of the elastic body is in contact with the static ring and pushes the static ring to the dynamic ring, and the static ring magnet is arranged on one side of the static ring, which is far away from the dynamic ring;
the auxiliary compensation assembly comprises an iron core, a speed measurement assembly and a speed indication assembly, the iron core is embedded into the shell, the iron core is L-shaped, the end part of the L-shaped short side is adjacent to one end of the static ring magnet, the speed measurement assembly comprises a coordination sheet and a coil, the coordination sheet is installed on the shell through a fastener, one part of the coil is wrapped by the coordination sheet, one section of the coil is sleeved on the L-shaped long side of the iron core, the other part of the coil is abutted against the speed indication assembly in an adjacent manner, the speed indication assembly comprises a magnet bottom sleeve and a moving magnet, the magnet bottom sleeve is sleeved on the shaft sleeve and locked by the fastener, a plurality of moving magnets are arranged on the outer surface of the magnet bottom sleeve, and the moving magnets;
the coil comprises a plurality of leads and a rectifying plate.
The static ring and the elastic body are articles in the prior art, the working principle of the static ring and the elastic body is the same as that of the prior art, the static ring magnet arranged on the back of the static ring is a key component for adjusting the sealing surface, the moving magnet and the static ring magnet are permanent magnets and have NS-grade magnetic fields, the iron core can be magnetized by the current in the coil to generate a magnetic pole, when the magnet bottom sleeve and the moving magnet on the shaft sleeve rotate along with the main shaft, the magnetic field of the moving magnet rotates, and the adjacent part of the coil generates relative cutting motion with the magnetic field, so that magnetic induction current is generated in the coil, the coil is a complete loop, the current can also flow through the coil part sleeved on the long edge of the L-shaped iron core to form an electromagnet effect, the specific magnetic pole direction of the L-shaped iron core is related to the current flowing direction on the L-shaped long edge, and when the design, the end part of the L-shaped short, the suction force is related to the magnetic level strength of the iron core, the magnetic level strength of the iron core is related to the current level in the coil, and the current level in the coil is related to the rotating speed of the moving magnet, so that the rotating speed of the spindle can be converted into the suction force received by the static ring magnet, the larger the suction force received by the static ring magnet is, the smaller the contact force between the static ring and the moving ring is, on the high-speed occasion of the spindle, the smaller the contact force on the sealing surface of the static ring and the moving ring is, the lower the abrasion degree can be ensured, and the operation logic can also play a greater role when the machine is: when the machine is started, the rotating speed of the main shaft is increased from zero, the relative speed of the dynamic and static sealing surfaces is increased, the contact force is reduced, and the friction power is kept in a low state; when the machine is stopped, the contact force casting of the sealing surface is increased along with the reduction of the rotating speed, and when the machine is completely stopped, the contact force is maximum (the original pretightening force of the elastomer); the sealing reliability in the shutdown state is ensured, the original pretightening force of the elastomer can be designed to be larger, and the number of turns of the coil wrapped around the iron core is adjusted, so that different pretightening force-rotating speed adjusting curves are obtained.
The magnetic field of the moving magnet rotates, the current generated in the coil is alternating current, the alternating current needs to be rectified into direct current to generate a magnetic pole with stable direction on the iron core, the alternating current and the direct current are realized through a rectifying plate, the rectifying plate is a circuit module formed by a plurality of diodes, like the most basic alternating current and direct current rectifying device is formed by four diodes, and higher-level rectifying devices with the regulated current are complicated, and are not described herein again and belong to the category and the basic theory of electrical engineering.
Furthermore, the leakage-proof mechanical seal also comprises an end cover, the end cover is arranged on one side of the shell, the center of the end cover is provided with a through hole for passing through the machine shaft, and the inner surface of the through hole in the center of the end cover is provided with dustproof teeth.
An end cover is used for sealing one side of the mechanical sealing principle machine, the integration is further increased, and the dustproof tooth in the center of the end cover can prevent dust in the atmosphere from entering the inner diameter of the sealing surface, so that the probability of abrasion of the sealing surface due to dust and sand grains is greatly reduced.
As optimization, the speed measuring assembly can move in the radial direction, the hole where the coordination piece is connected with the shell is a long waist hole, and the length direction of the long waist hole is in the radial direction with the axis of the shaft sleeve as the center.
But the subassembly that tests the speed radial movement, realize through its long waist hole, loosen and compress tightly the screw on the shell with the coordination piece, pull the coordination piece and carry out certain distance's radial movement, then lock again, the coordination piece moves in a new position. The speed measuring component moves radially, the rotating speed of the same main shaft can be adjusted to be converted into the magnitude of coil current, the shape of the pretightening force-rotating speed adjusting curve is adjusted, the pretightening force-rotating speed adjusting curve can be translated by adjusting the radial position of the speed measuring component, and therefore the adjusting range is enlarged. For example, one machine sometimes operates under a low-pressure working condition, needs to operate under a high-pressure working condition after a process is replaced, and needs to have larger sealing surface pretightening force when a medium is high-pressure, the traditional mechanical seal does not have the capability of pretightening force adjustment, only can operate by the original pretightening force, can be replaced, and cannot replace a machine seal adaptive to the working condition, but the replacement of the machine seal is a very troublesome thing, and a plurality of parts need to be axially removed.
As optimization, the wall surface of the shell is provided with a pressure distribution hole, one end of the pressure distribution hole is connected to the outer surface of the shell, the other end of the pressure distribution hole is connected to the space communicated with the movable ring in the shell, the anti-leakage mechanical seals are connected in series for use,
the anti-leakage mechanical seal further comprises a pressure distribution cylinder, the pressure distribution cylinder comprises a cylinder body, a first piston and a second piston, the diameter of the first piston is larger than that of the second piston, two cylinder sections with different areas are arranged in the cylinder body, the first piston and the second piston are respectively arranged in the cylinder sections, one sides of the first piston and the second piston which face each other are connected through a polish rod, one side of the first piston, which faces away from the second piston, is connected with a pressure distribution hole close to the atmosphere side, and one side of the second piston, which faces away from the first piston, is connected with a pressure distribution hole close to the machine side.
Sometimes, the medium pressure in the machine is very large, the first medium pressure and the second external pressure are on the two sides of the sealing surface in the radial direction, and when the pressure difference is large, the medium can break away the sealing surface, so the machine seal in the prior art can limit the use pressure, but the machine seal can be used in series, so the pressure difference of the single-stage sealing surface is reduced, and the principle is as follows: when the medium liquid is in high pressure, the medium liquid enters the second piston end in the cylinder from the first-stage pressure distribution hole, the first piston end in the cylinder and the shell connected with the first piston end and close to the atmosphere side are filled with intermediate liquid, the intermediate liquid can be directly the medium liquid or can be inert liquid which does not react with the medium liquid, the pressure of the medium liquid is larger than that of the intermediate liquid and achieves balance because the first piston and the second piston have different diameters and the first piston is large, when the piston area of the first piston is twice of that of the second piston, the pressure transmitted to the intermediate liquid by the medium liquid is half of the pressure of the medium liquid, so that the differential pressure born by the dynamic and static ring sealing surfaces close to the machine side is half of the medium pressure, the dynamic and static ring sealing surfaces at the atmosphere side also bear half of the pressure, the pressure distribution effect is achieved, and the intermediate liquid can be injected through a point arranged on a connecting pipe of the pressure distribution cylinder and the pressure distribution hole at the atmosphere side, and plugging after injection.
As optimization, the number of the moving magnets and the number of the static ring magnets are relatively prime. Because the number of the movable magnets and the static ring magnets is limited, the magnetic field and the current in the coil cannot be completely uniform, the number of the two groups of magnets is relatively prime, the effect of preventing the occurrence of periodic superposition can be achieved, and the peak overlapping in curves of current, attractive force and the like cannot occur, so that the pretightening force of the sealing surface is smaller at a certain moment and larger at other moments.
Compared with the prior art, the invention has the beneficial effects that: the auxiliary compensation assembly is used for adjusting the contact force of the sealing surface of the dynamic and static rings to be associated with the rotating speed of the main shaft, when the rotating speed of the main shaft is high, the contact force is reduced to prevent the friction power from being greatly increased, when the rotating speed is low, the sealing surface has larger contact force to ensure reliable sealing, and larger sealing force is provided to prevent leakage when the machine is stopped; the arrangement mode of the two groups of magnets and the coil is simple in structure, the control of an external controller is not needed, the relation curve of the contact force of the sealing surface and the rotating speed of the main shaft can be adjusted by changing the number of turns of the coil wound on the iron core and the distance between the positioning sheet and the moving magnet, and the adjusting range is greatly increased; the arrangement of the end cover and the shaft sleeve increases the integration of the invention, and the installation is convenient; the mechanical seal main body part is used in series, and the pressure distribution cylinder is used for connecting the two seal cavities, so that the effect of distributing medium pressure is achieved, and the working condition application range of the mechanical seal is greatly improved.
Drawings
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is view A of FIG. 1;
FIG. 3 is view L section of FIG. 1;
FIG. 4 is a schematic diagram of the connection of the present invention in series;
fig. 5 is a schematic structural view of the pressure distribution cylinder of the present invention.
In the figure: 1-shaft sleeve, 2-moving ring, 3-shell, 31-pressure distribution hole, 4-stationary ring component, 41-stationary ring, 42-elastic body, 43-stationary ring magnet, 5-auxiliary compensation component, 51-iron core, 52-speed measurement component, 521-position distribution piece, 5211-long waist hole, 522-coil, 5221-rectifying plate, 53-speed indication component, 531-magnet bottom sleeve, 532-moving magnet, 6-end cover, 61-dustproof tooth, 7-pressure distribution barrel, 71-barrel, 72-first piston, 73-second piston and 8-liquid injection point.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the anti-leakage mechanical seal with automatic shutdown protection comprises a movable ring 2, a housing 3, a stationary ring component 4 and an auxiliary compensation component 5, wherein the stationary ring component 4 is arranged in the housing 3, the movable ring 2 is connected to a main shaft and rotates together to abut against the stationary ring component 4 to form a rotary sealing surface, the auxiliary compensation component 5 is arranged in the housing 3 and is positioned at the back of the stationary ring component 4, and the auxiliary compensation component 5 generates suction force to the stationary ring component 4 to reduce the pretightening force on the stationary ring sealing surface.
The mechanical seal is arranged on the main shaft and the casing, wherein a rotating part is arranged on the main shaft and comprises a movable ring, and the other non-rotating parts are arranged on the casing or indirectly arranged on the casing and are locked by fasteners such as bolts, screws and the like. The dynamic ring 2 is connected to the main shaft and rotates along with the main shaft, the dynamic ring 2 and the static ring component 4 form a rotating contact surface, the surface of the rotating contact surface is very smooth, a dynamic sealing surface is formed by static and dynamic, and the steps like the material selection of the sealing surface and the like are the same as the mechanical sealing in the prior art, for example, a medium containing trace particles uses a hard-to-hard sealing surface, and a hard-to-soft sealing surface is used in a low-temperature clear water occasion.
The shell 3 is the appearance of a mechanical seal, can replace parts such as a sealing gland and the like, and is used only by arranging corresponding connecting holes at the connecting position.
According to the invention, the auxiliary compensation assembly 5 is additionally arranged, the compensation ring of the mechanical seal is selected as the static ring assembly 4, the static ring assembly 4 is used as an axial floating compensation part, and the auxiliary compensation assembly 5 can adjust the pressing force of the static ring assembly 4 to the moving ring 2 according to the rotating speed of the main shaft, so that the heating value and the sealing clearance of the sealing surface are improved, and the sealing force matched with the working condition is obtained. When the mechanical seal is used in a low-rotating-speed situation, the pretightening force of the dynamic and static seal surfaces can be larger, and even if the pretightening force is larger, great abrasion can not occur, so that the pretightening force is large, and the seal is reliable.
As shown in fig. 1, the leak-proof mechanical seal further comprises a shaft sleeve 1, and a movable ring 2 is mounted on the shaft sleeve 1. The shaft sleeve 1 increases the packaging property of the invention, when in use, the shaft sleeve 1 is only required to be sleeved on the main shaft and then the surface of the shaft sleeve 1 exposed out of the shell 3 is locked by using the set screw, the installation is more convenient, if the shaft sleeve 1 is not arranged, the installation of the movable ring 2 is more troublesome, and the pretightening force on the static ring component 4 is not well adjusted.
As shown in fig. 1 ~ 3, the stationary ring assembly 4 includes a stationary ring 41, an elastic body 42, and a stationary ring magnet 43, the stationary ring 41 is installed in the housing 3, the elastic body 42 has one end abutting against the inner wall of the housing 3 and one end contacting the stationary ring 41 and pushing the stationary ring 41 toward the moving ring 2, and the stationary ring magnet 43 is installed on the side of the stationary ring 41 facing away from the moving ring 2;
the auxiliary compensation assembly 5 comprises an iron core 51, a speed measurement assembly 52 and a speed indication assembly 53, the iron core 51 is embedded in the shell 3, the iron core 51 is L-shaped, the end part of the L-shaped short side is adjacent to one end of the stationary ring magnet 43, the speed measurement assembly 52 comprises a matching sheet 521 and a coil 522, the matching sheet 521 is installed on the shell 3 through a fastener, one part of the coil 522 is wrapped by the matching sheet 521, one section of the coil 522 is sleeved on the L-shaped long side of the iron core 51, the other part of the coil 522 is adjacent to and abutted against the speed indication assembly 53, the speed indication assembly 53 comprises a magnet bottom sleeve 531 and a movable magnet 532, the magnet bottom sleeve 531 is sleeved on the shaft sleeve 1 and locked by the fastener, a plurality of movable magnets 532 are arranged on the outer surface of the magnet bottom sleeve 531, and the movable magnet 51 is adjacent to one part of;
the coil 522 includes a plurality of conductive wires and a rectifying plate 5221.
The static ring 41 and the elastic body 42 are the same as the prior art, the working principle thereof is the same as the prior art, the static ring magnet 43 arranged on the back of the static ring 41 is a key component for adjusting the sealing surface, the moving magnet 532 and the static ring magnet 43 are permanent magnets, the static ring magnet 43 has an NS-level magnetic field, the iron core 51 can be magnetized by the current in the coil 522 to generate a magnetic pole, as shown in fig. 1, when the magnet bottom sleeve 531 and the moving magnet 532 on the shaft sleeve 1 rotate along the main shaft, the magnetic field of the moving magnet 532 rotates, and the adjacent part of the coil 522 generates a relative cutting motion with the magnetic field, so that a magnetic induction current is generated in the coil 522, the coil 522 is a complete loop, the current also flows through the coil part sleeved on the long side of the L-shaped iron core 51 to form an electromagnet effect, the specific magnetic pole direction of the L-shaped iron core 51 is related to the current flowing direction on the L-shaped long side, when the design is carried out, the end part of the L-shaped short side of the iron core 51 is in an attraction relationship with the static ring magnet 43, the attraction force is related to the magnetic level strength of the iron core 51, the magnetic level strength of the iron core 51 is related to the current magnitude in the coil 522, and the current magnitude in the coil 522 is related to the rotating speed of the movable magnet 532, so that the rotating speed of the spindle can be converted into the attraction force received by the static ring magnet 43, the larger the attraction force received by the static ring magnet 43 is, the smaller the contact force between the static ring 41 and the movable ring 2 is, and in the high-speed occasion of the spindle, the small contact force on the sealing surface of the static ring and the movable ring can ensure that the abrasion degree is reduced, and the: when the machine is started, the rotating speed of the main shaft is increased from zero, the relative speed of the dynamic and static sealing surfaces is increased, the contact force is reduced, and the friction power is kept in a low state; when the machine is stopped, the contact force casting of the sealing surface is increased along with the reduction of the rotating speed, and when the machine is completely stopped, the contact force is maximum (the original pretightening force of the elastic body 42); the sealing reliability in the shutdown state is ensured, the original pretightening force of the elastic body 42 can be designed to be larger, and the number of turns of the coil 522 wrapped around the iron core 52 is adjusted, so that different pretightening force-rotating speed adjusting curves are obtained.
The magnetic field of the moving magnet 532 rotates, the current generated in the coil 522 is an alternating current, and the alternating current needs to be rectified into a direct current to generate a magnetic pole with a stable direction on the iron core 51, while the alternating current and the direct current are realized through the rectifying plate 5221, the rectifying plate 5221 is a circuit module composed of a plurality of diodes, for example, the most basic rectifying device of the alternating current and the direct current is composed of four diodes, and higher-level rectifying devices with regulated current are complicated, which are not described herein again and belong to the field and the basic theory of electrical technology.
As shown in figure 1, the leakage-proof mechanical seal also comprises an end cover 6, the end cover 6 is arranged at one side of the shell 3, a through hole is arranged at the center of the end cover 6 and used for passing through a machine shaft, and dustproof teeth 61 are arranged on the inner surface of the through hole at the center of the end cover 6.
The integration is further increased by using an end cover 6 to close one side of the mechanical sealing principle machine, and the dust-proof tooth 61 in the center of the end cover 6 can prevent dust in the atmosphere from entering the inner diameter of the sealing surface, thereby greatly reducing the probability of abrasion of the sealing surface due to dust and sand grains.
As shown in fig. 3, the velocity measuring assembly 52 can move radially, the hole connecting the coordination plate 521 and the housing 3 is a long waist hole 5211, and the length direction of the long waist hole 5211 is radial with the axis of the shaft sleeve 1 as the center.
The speed measuring component 52 can move radially, and is realized by a long waist hole 5211, the screw which presses the coordination piece 521 to the shell 3 is loosened, the coordination piece 521 is pulled to move radially for a certain distance, and then the locking is carried out again, and the coordination piece 521 runs at a new position. The speed measuring component 52 moves radially, the rotating speed of the same main shaft can be adjusted to be converted into the current of the coil 522, the shape of the pretightening force-rotating speed adjusting curve is adjusted, and the pretightening force-rotating speed adjusting curve can be translated by adjusting the radial position of the speed measuring component 52, so that the adjusting range is enlarged. For example, one machine sometimes operates under a low-pressure working condition, needs to operate under a high-pressure working condition after a process is replaced, and needs to have larger sealing surface pretightening force when a medium is high-pressure, the traditional mechanical seal does not have the pretightening force adjusting capacity, only can operate by the original pretightening force, can be replaced, and cannot replace a machine seal adaptive to the working condition, but the replacement of the machine seal is a very troublesome thing, and a plurality of parts need to be axially removed, but the invention does not need to change parts on a main shaft, and only needs to disassemble an end cover 6 and adjust the radial position of a positioning sheet 521.
As shown in fig. 1 and 4, the wall surface of the casing 3 is provided with a pressure distribution hole 31, one end of the pressure distribution hole 31 is connected to the outer surface of the casing 3, and the other end is connected to the space inside the casing 3 communicated with the movable ring 2, the leakage-proof mechanical seal is used in series,
the anti-leakage mechanical seal further comprises a pressure distribution cylinder 7, as shown in fig. 5, the pressure distribution cylinder 7 comprises a cylinder body 71, a first piston 72 and a second piston 73, the diameter of the first piston 72 is larger than that of the second piston 73, two cylinder sections with different areas are arranged in the cylinder body 71, the first piston 72 and the second piston 73 are respectively arranged in the cylinder body, the opposite sides of the first piston 72 and the second piston 73 are connected through a polish rod, the side of the cylinder body 71, which is opposite to the second piston 73, of the first piston 72 is spatially connected with the pressure distribution hole 31 close to the atmosphere side, and the side of the cylinder body 71, which is opposite to the first piston 72, of the second piston 73 is spatially connected with the pressure distribution hole 31 close to the machine side.
Sometimes, the medium pressure in the machine is very large, the first medium pressure and the second external pressure are on the two sides of the sealing surface in the radial direction, and when the pressure difference is large, the medium can break away the sealing surface, so the machine seal in the prior art can limit the use pressure, but the machine seal can be used in series, so the pressure difference of the single-stage sealing surface is reduced, and the principle is as follows: as shown in fig. 4, when the medium liquid is at high pressure, the medium liquid enters from the first-stage pressure distribution hole 31 to the second piston 73 end in the cylinder 71, the first piston 72 end in the cylinder 71 and the housing 3 connected with the first piston 72 end near the atmosphere side are filled with the intermediate liquid, the intermediate liquid can be the medium liquid directly or an inert liquid which does not react with the medium liquid, the pressure of the medium liquid is greater than that of the intermediate liquid and reaches equilibrium because the first piston 72 and the second piston 73 have different diameters and the first piston 72 is large, when the piston area of the first piston 72 is twice that of the second piston 73, the pressure transmitted by the medium liquid to the intermediate liquid is half of itself, so that the liquid injection sealing surface near the machine side and the static ring sealing surface also bear half of the pressure, the effect of pressure distribution is achieved, the intermediate liquid can be injected through the connecting point 8 arranged on the connecting pipe of the pressure distribution cylinder 7 and the atmosphere side pressure distribution hole 31, and plugging after injection.
The number of the moving magnets 532 is coprime to the number of the stationary ring magnets 43. Because the number of the movable magnets 532 and the static ring magnets 43 is limited, the magnetic field and the current in the coil 522 cannot be completely uniform, the number of the two groups of magnets is relatively prime, the effect of preventing the occurrence of periodic superposition can be achieved, and the peak overlapping in curves of current, attractive force and the like cannot occur, so that the pretightening force of the sealing surface is smaller at a certain moment and larger at other moments.
The operation principle of the device is as follows: the movable ring 2 and the speed indicating assembly 53 rotate along with the spindle, the movable ring 2 and the static ring 41 form a rotary sealing surface, the original contact force of the sealing surface is the elastic force of the elastic body 42, a group of rotary movable magnets 532 is arranged in the speed indicating assembly 53, the movable magnets 532 rotate to generate current in the coils 522, the coils 522 are sleeved on the iron core 51, the iron core 51 is magnetized to generate suction force on the static ring magnet 43 connected to the static ring 41, the suction force is related to the rotating speed of the spindle, and the contact force of the sealing surface of the movable ring and the static ring can be reduced by the suction force, so that the purpose of allocating the contact force is.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. The utility model provides a take automatic shutdown protection prevent leaking mechanical seal which characterized in that: prevent leaking mechanical seal and include rotating ring (2), shell (3), quiet ring subassembly (4) and auxiliary compensation subassembly (5), quiet ring subassembly (4) set up in shell (3), rotating ring (2) and quiet ring subassembly (4) are supported and are leaned on and form rotary seal face, auxiliary compensation subassembly (5) set up in shell (3), are located at quiet ring subassembly (4) back, and auxiliary compensation subassembly (5) produce suction to quiet ring subassembly (4) and make the last pretightning force of the sealed face of moving ring reduce.
2. A leak-proof mechanical seal with auto-stop protection as defined in claim 1, wherein: the leakproof mechanical seal also comprises a shaft sleeve (1), and the movable ring (2) is arranged on the shaft sleeve (1).
3. A leak-proof mechanical seal with auto-stop protection as defined in claim 2, wherein: the static ring assembly (4) comprises a static ring (41), an elastic body (42) and a static ring magnet (43), the static ring (41) is installed in the shell (3), one end of the elastic body (42) abuts against the inner wall of the shell (3), one end of the elastic body is in contact with the static ring (41) and pushes the static ring (41) to the moving ring (2), and the static ring magnet (43) is installed on one side, away from the moving ring (2), of the static ring (41);
the auxiliary compensation assembly (5) comprises an iron core (51), a speed measuring assembly (52) and a speed indicating assembly (53), the iron core (51) is embedded into the shell (3), the end part of the L-shaped short side of the iron core (51) is adjacent to one end of the static ring magnet (43), the speed measuring assembly (52) comprises a matching sheet (521) and a coil (522), the matching sheet (521) is installed on the shell (3) through a fastener, one part of the coil (522) is wrapped by the matching sheet (521), one section of the coil (522) is sleeved on the L-shaped long side of the iron core (51), the other part of the coil (522) is abutted against the speed indicating assembly (53) in an adjacent mode, the speed indicating assembly (53) comprises a magnet bottom sleeve (531) and a movable magnet (532), the magnet bottom sleeve (531) is sleeved on the shaft sleeve (1) and locked by the fastener, and a plurality of movable magnets (532) are arranged on the outer surface of the magnet bottom sleeve (531), the moving magnet (51) is adjacent to a portion of the coil (522);
the coil (522) includes a plurality of conductive wires and a rectifying plate (5221).
4. A leak-proof mechanical seal with auto-stop protection as defined in claim 3, wherein: the anti-leakage mechanical seal further comprises an end cover (6), the end cover (6) is installed on one side of the shell (3), a through hole is formed in the center of the end cover (6) and used for allowing a machine shaft to pass through, and dustproof teeth (61) are arranged on the inner surface of the through hole in the center of the end cover (6).
5. A leak-proof mechanical seal with auto-stop protection as defined in claim 3, wherein: the speed measuring component (52) can move in the radial direction, the hole formed by connecting the matching sheet (521) and the shell (3) is a long waist hole (5211), and the length direction of the long waist hole (5211) is in the radial direction with the axis of the shaft sleeve (1) as the center.
6. A leak-proof mechanical seal with auto-stop protection as defined in claim 3, wherein: the wall surface of the shell (3) is provided with a pressure distribution hole (31), one end of the pressure distribution hole (31) is connected to the outer surface of the shell (3), the other end is connected to the space communicated with the movable ring (2) in the shell (3), the anti-leakage mechanical seals are used in series,
the anti-leakage mechanical seal further comprises a pressure distribution cylinder (7), the pressure distribution cylinder (7) comprises a cylinder body (71), a first piston (72) and a second piston (73), the diameter of the first piston (72) is larger than that of the second piston (73), two cylinder sections with different areas are arranged in the cylinder body (71), the first piston (72) and the second piston (73) are respectively arranged in the cylinder body, one sides, facing to each other, of the first piston (72) and the second piston (73) are connected through a polish rod, one sides, facing away from the second piston (73), of the first piston (72) and the cylinder body (71) are spatially connected with a pressure distribution hole (31) close to the atmosphere side, and one sides, facing away from the first piston (72), of the second piston (73) and the cylinder body (71) are spatially connected with a pressure distribution hole (31) close to the machine side.
7. A leak-proof mechanical seal with auto-stop protection as defined in claim 3, wherein: the number of the moving magnets (532) and the number of the static ring magnets (43) are relatively prime.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910909968.9A CN110630746B (en) | 2019-09-25 | 2019-09-25 | Take automatic shutdown protection to prevent leaking mechanical seal |
| CN202010637679.0A CN111981131B (en) | 2019-09-25 | 2019-09-25 | Anti-leakage mechanical seal with automatic stop protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910909968.9A CN110630746B (en) | 2019-09-25 | 2019-09-25 | Take automatic shutdown protection to prevent leaking mechanical seal |
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| CN202010637679.0A Division CN111981131B (en) | 2019-09-25 | 2019-09-25 | Anti-leakage mechanical seal with automatic stop protection |
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| CN110630746A true CN110630746A (en) | 2019-12-31 |
| CN110630746B CN110630746B (en) | 2020-08-14 |
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| CN202010637679.0A Active CN111981131B (en) | 2019-09-25 | 2019-09-25 | Anti-leakage mechanical seal with automatic stop protection |
| CN201910909968.9A Active CN110630746B (en) | 2019-09-25 | 2019-09-25 | Take automatic shutdown protection to prevent leaking mechanical seal |
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| CN202010637679.0A Active CN111981131B (en) | 2019-09-25 | 2019-09-25 | Anti-leakage mechanical seal with automatic stop protection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111396559A (en) * | 2020-03-27 | 2020-07-10 | 王亮 | Single-row magnetic mechanical seal |
| CN111969769A (en) * | 2020-09-01 | 2020-11-20 | 浙江力屹机电有限公司 | High-efficient radiating Y2 motor casing |
| CN112303239A (en) * | 2020-10-28 | 2021-02-02 | 中国计量大学 | Novel active dynamic pressure type air film end face sealing device and intelligent control method thereof |
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| CN113494610B (en) * | 2021-07-08 | 2023-06-27 | 西华大学 | Floating ring structure with damping support and mechanical sealing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102261476A (en) * | 2011-06-02 | 2011-11-30 | 温州市天成密封件制造有限公司 | Flexible seal system |
| CN202971937U (en) * | 2012-12-12 | 2013-06-05 | 山东荣利中石油机械有限公司 | Magnetic mechanically sealing device |
| CN205956388U (en) * | 2016-07-15 | 2017-02-15 | 清华大学 | Mechanical seal device based on throttle structure active control |
| CN106763791B (en) * | 2016-12-15 | 2018-04-24 | 江苏大学 | A kind of seal clearance control method of non-contact mechanical seal |
| CN207297889U (en) * | 2017-09-30 | 2018-05-01 | 四川大禹机械密封件制造有限公司 | Run data acquisition machinery sealing device |
| CN207961525U (en) * | 2018-01-09 | 2018-10-12 | 何同均 | One kind can compensate for from flushing type water injecting pump sealing structure of shaft end |
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2019
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- 2019-09-25 CN CN201910909968.9A patent/CN110630746B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396559A (en) * | 2020-03-27 | 2020-07-10 | 王亮 | Single-row magnetic mechanical seal |
| CN111969769A (en) * | 2020-09-01 | 2020-11-20 | 浙江力屹机电有限公司 | High-efficient radiating Y2 motor casing |
| CN111969769B (en) * | 2020-09-01 | 2021-07-02 | 浙江力屹机电有限公司 | High-efficient radiating Y2 motor casing |
| CN112303239A (en) * | 2020-10-28 | 2021-02-02 | 中国计量大学 | Novel active dynamic pressure type air film end face sealing device and intelligent control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111981131B (en) | 2022-03-22 |
| CN111981131A (en) | 2020-11-24 |
| CN110630746B (en) | 2020-08-14 |
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