CN111486233A - Hydraulic self-tightening packing sealing structure - Google Patents
Hydraulic self-tightening packing sealing structure Download PDFInfo
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- CN111486233A CN111486233A CN202010412837.2A CN202010412837A CN111486233A CN 111486233 A CN111486233 A CN 111486233A CN 202010412837 A CN202010412837 A CN 202010412837A CN 111486233 A CN111486233 A CN 111486233A
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- packing
- pressing
- cavity
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- pressure medium
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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
- F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
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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
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/184—Tightening mechanisms
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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
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/24—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings with radially or tangentially compressed packing
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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
- F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
- F16J15/48—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings influenced by the pressure within the member to be sealed
Abstract
The invention relates to the field of packing sealing, in particular to a hydraulic self-tightening packing sealing structure which comprises a shaft, a packing box, a packing and a pressing assembly, wherein the packing box is sleeved on the shaft, the packing is positioned in the packing box, the pressing assembly is used for applying pressing force to the packing in the axial direction, the pressing assembly further comprises a collecting cavity used for collecting high-pressure medium leaked from the position between the shaft and the packing, a pressing piece for applying radial pressing force to the packing is arranged between the packing and the packing box, and the power of the pressing piece for applying the radial pressing force to the packing is derived from the hydraulic pressure. This scheme has solved the not good problem of the packing leakproofness of keeping away from the gland.
Description
Technical Field
The invention relates to the field of packing sealing, in particular to a hydraulic self-tightening packing sealing structure.
Background
The packing sealing is a sealing form mainly used in mobile equipment, the principle of the packing sealing is that packing is compressed through a gland or a packing box, and packing weaving gaps become small after the packing is subjected to pressure, so that leakage of media through the packing weaving gaps can be prevented, and the sealing effect is achieved. In addition, after the filler is subjected to pressure, the filler is radially deformed by the pressure, the filler is tightly combined with the shaft, and a gap between the filler and the shaft is reduced, so that the medium is prevented from axially leaking through a gap between the filler and the shaft, and the sealing effect is achieved.
Traditional packing structure is shown in fig. 1, this figure shows traditional two-stage packing structure (the left end of axle 1 is the atmosphere side, the right-hand member of axle 1 is the high pressure medium side), including first level packing sealing mechanism and second level packing sealing mechanism, first level packing sealing mechanism includes one-level stuffing box 7 and many rings of one-level packing 12, one-level stuffing box 7 cover is established on axle 1, be equipped with leading cover 14 and the packing clamping ring 11 of cover on axle 1 in the one-level stuffing box 7, one-level packing 12 is filled in the space that one-level stuffing box 7, axle 1, leading cover 14 and packing clamping ring 11 are constituteed. The second-stage packing sealing mechanism comprises a second-stage packing box 4 and a plurality of rings of second-stage packing 24, the second-stage packing box 4 is sleeved on the shaft 1, the second-stage packing box 4 is located on the left side of the first-stage packing box 7, the right end of the second-stage packing box 4 is inserted into the first-stage packing box 7, and the right end of the second-stage packing box 4 is abutted to the packing pressing ring 11. Be stamped gland 2 in the left side of second grade gland box 4, gland 2 cover is established on axle 1, it establishes the compressing bush 5 epaxial at 1 to be equipped with two covers in the second grade gland box 4, second grade packing 24 is filled at second grade gland box 4, axle 1, in the space that two compressing bush 5 constitute, be equipped with the clamping ring 3 of cover on axle 1 between gland 2's the right-hand member face and the left compressing bush 5, through screwing up gland 2 like this, gland 2 extrudees clamping ring 3, clamping ring 3 extrudees left compressing bush 5, make left compressing bush 5 extrude second grade packing 24 and realize sealedly. Meanwhile, when the gland 2 is screwed down, the gland 2 extrudes the second-stage stuffing box 4 rightwards, the right end of the second-stage stuffing box 4 extrudes the packing pressing ring 11, and the packing pressing ring 11 extrudes the first-stage stuffing 12, so that the first-stage stuffing 12 is sealed by axial pressing force.
The sealing of the first-stage packing sealing mechanism and the sealing of the second-stage packing sealing mechanism are realized by axially compressing the packing to enable the packing to deform in the radial direction, the packing is tightly combined with the shaft, and the gap between the packing and the shaft is reduced, so that the axial leakage channel of a high-pressure medium is blocked, and the sealing purpose is achieved. The stuffing seal research shows that the pressing force of the gland 2 mostly acts on 1-2 circles of stuffing close to the gland 2, the axial pressing force obtained by each circle of stuffing is reduced along with the increase of the distance between the stuffing and the gland 2, so that the pressing force obtained by the first-stage stuffing 12 close to the high-pressure medium side (the first-stage stuffing 12 close to the right end of the shaft 1) is minimum, and the sealing effect of the first-stage stuffing 12 is greatly reduced. When the leakage amount is large, the leakage of the high-pressure medium can be prevented only by screwing the gland 2 to increase the axial pressing force of the packing, but the axial pressing force of the first-stage packing 12 far away from the gland 2 is limited due to the fact that the first-stage packing 12 is far away from the gland 2, so that the radial deformation of the first-stage packing 12 is insufficient, the pressing force of the first-stage packing 12 on the shaft 1 is insufficient, and the axial leakage of the high-pressure medium cannot be effectively sealed.
In addition, in both the first stage packing seal mechanism and the second stage packing seal mechanism, the packing is worn away with the use of the packing seal structure, so that the gap between the packing and the shaft becomes large and the sealing performance becomes poor.
Disclosure of Invention
The invention aims to provide a hydraulic self-tightening packing structure to solve the problem of poor packing tightness of a packing far away from a gland.
In order to achieve the purpose, the invention adopts the following technical scheme: a hydraulic self-tightening packing sealing structure comprises a shaft, a packing box sleeved on the shaft, packing positioned in the packing box, a pressing assembly used for applying pressing force to the axial direction of the packing, and a collecting cavity used for collecting leaked high-pressure media.
The principle and the advantages of the scheme are as follows: the packing box is used for containing packing, and the compressing assembly is used for carrying out axial extrusion on the packing so as to apply axial pressing force on the packing to realize sealing. As the present seal structure is used, the packing is worn and becomes loose, thereby deteriorating the sealing performance of the packing. After the sealing performance of the packing is poor, the high-pressure medium enters the collecting cavity through the loose packing, the high-pressure medium in the collecting cavity is increased, the hydraulic pressure in the collecting cavity is increased, and the compressing piece applies radial compressing force to the packing under the action of the hydraulic pressure of the leaked high-pressure medium, so that the packing is radially compressed, the packing is in closer contact with the shaft, the packing is more compact, the high-pressure medium is prevented from axially leaking into the packing box through the packing, and the sealing effect of the packing is improved. Along with the use of packing, the packing can be worn and torn once more, and high-pressure medium can supply new high-pressure medium to collecting chamber for the pressure in the collecting chamber increases, and the piece that compresses tightly can carry out radial extrusion once more to the packing, establishes the new sealed state that radially compresses tightly the packing automatically.
Therefore, by the scheme, the method has the following beneficial effects:
1. the packing can simultaneously bear axial pressing force and radial pressing force, and compared with the packing in the prior art which only bears the axial pressing force, the packing has better sealing effect.
2. According to the scheme, the power of the pressing piece for applying radial pressure to the filler is derived from the hydraulic pressure of the leaked high-pressure medium in the collecting cavity, the hydraulic pressure in the collecting cavity is increased along with the increase of the leakage amount of the high-pressure medium, so that automatic radial pressing is realized, pressing through an external mechanism is not needed, manual operation is not needed, and the automatic radial pressing device is more automatic and convenient to operate.
3. Along with the use of packing, the packing can receive wearing and tearing many times, and the packing receives the back that wears at every turn, and high-pressure medium can supply new high-pressure medium to collecting the chamber for the pressure grow in the collecting chamber, and the piece that compresses tightly can carry out radial extrusion once more to the packing. Therefore, the filler is radially extruded for many times according to the abrasion condition of the filler, the service life of the filler is longer, the filler is effectively and fully utilized, and the maintenance cost of equipment is reduced.
4. The poorer the sealing performance of the filler in the scheme is, the larger the leakage amount of the high-pressure medium is, the larger the hydraulic pressure in the collection cavity is, and the better the radial sealing effect of the filler is.
Preferably, as an improvement, the axial sliding connection of the pressing member is between the stuffing box and the stuffing, the side surfaces of the pressing member and the stuffing, which are mutually attached, are inclined surfaces, and the pressing member axially moves from the low end to the high end of the stuffing inclined surface under the action of the hydraulic pressure of the high-pressure medium. The lower end of the filler inclined plane refers to one end of the filler inclined plane close to the shaft, and the higher end of the filler inclined plane refers to one end of the filler inclined plane far away from the shaft. From this, when the hydraulic pressure in the collection chamber became big, the inclined plane relative slip on packing of pressing down the piece under the effect of hydraulic pressure, because the moving direction that presses down the piece is for following the inclined plane low end of packing to high-end axial displacement, so press down the piece and at the removal in-process, the inclined plane that presses down the piece carries out radial extrusion to the inclined plane of packing to realized pressing down the piece axial displacement in-process and automatically exerted radial packing force to packing.
Preferably, as an improvement, the area of the end face of the pressing member at the end subjected to the hydraulic pressure is larger than the area of the end face at the other end. From this, the terminal surface area that compresses tightly the one end that the piece is located the collection chamber compares the other end great, is favorable to improving the contact atress area of high pressure medium and compressing tightly the piece in the collection chamber like this, is convenient for promote to compress tightly a piece axial displacement.
Preferably, as an improvement, the pressing piece is a taper sleeve, and the taper sleeve is sleeved on the outer side of the filler. From this, the taper sleeve cover all can receive the radial extrusion that compresses tightly the piece in the circumferencial direction of the side of filler in the outside of packing for the packing receives the packing force that compresses tightly the piece more fully even, does benefit to and improves sealed effect.
Preferably, as an improvement, the collection chamber is annular, and sealing rings are arranged between the pressing assembly and the stuffing box and between the taper sleeve and the stuffing box. From this, the collection chamber is the annular, and the tip of taper sleeve all can receive the hydraulic pressure force of high pressure medium like this for the axial thrust that the tip of taper sleeve received is more even, does benefit to and makes taper sleeve axial displacement. The sealing ring is used for improving the sealing effect between the pressing component and the stuffing box and between the taper sleeve and the stuffing box, and the leakage of high-pressure medium in the collecting cavity is avoided.
Preferably, as an improvement, the compressing assembly comprises a compressing end, a flange is arranged on the compressing end, and the flange, the inner wall of the stuffing box and the side surface of one end of the compressing piece enclose to form the collecting cavity; the side wall of the pressing end attached to the shaft is provided with a liquid inlet cavity communicated with the collecting cavity. The flange of the pressing end, the inner wall of the stuffing box and the side of the end of the pressing piece together thus form a collecting chamber. The liquid inlet cavity is an opening for the leaked high-pressure medium to enter the collecting cavity. From this, through this scheme, after packing lax, compress tightly the subassembly and carry out the in-process that the axial compresses tightly to packing at axial displacement, the flange that compresses tightly the end can be to the tip direction removal that is close to the piece that compresses tightly to do benefit to the reduction and compress tightly the flange of end and compress tightly the distance between the piece tip, do benefit to and reduce the space of collecting the chamber, thereby hydraulic pressure force in the chamber is collected in the increase.
Preferably, as an improvement, the stuffing box is provided with a first abutting part for abutting against the large end of the pressing part and a second abutting part for abutting against the small end of the pressing part, the first abutting part and the large end of the pressing part form a first chamber, the second abutting part and the small end of the pressing part form a second chamber, and the axial length of the first chamber is greater than that of the second chamber. When the compressing member axially moves to the limit, if the axial length of the first chamber is smaller than that of the second chamber, the large end of the compressing member can abut against the first clamping surface, so that the high-pressure medium acts on the large end of the compressing member, only the large end of the compressing member is axially extruded, and the part of the compressing member between the first abutting part and the second abutting part is subjected to smaller extrusion force of the high-pressure medium. And through this scheme, because the axial length of first cavity is greater than the axial length of second cavity, so compress tightly the piece when the axial displacement reaches the limit, the tip that compresses tightly the piece at this moment and second department of support counterbalance, the tip that compresses tightly the piece can not support with first department of support counterbalance, when the tip that compresses tightly the piece supports second department of support, whole piece that compresses tightly is in the state of compressing tightly, does benefit to like this and guarantees to compress tightly the whole axial packing force that receives of piece to guarantee sealed effect.
Preferably, as an improvement, the collecting cavity is communicated with a collecting pipe, the collecting pipe is provided with a feedback detection control mechanism, and the feedback detection control mechanism comprises a flowmeter for detecting the leakage rate of the high-pressure medium, a valve for controlling whether the collecting pipe is communicated or not and a pressure manometer for detecting the pressure of the high-pressure medium in the collecting pipe; when the flowmeter detects that the leakage amount is higher than a set value, the valve is closed; and when the pressure measuring instrument detects that the hydraulic pressure is lower than a set value, the valve is opened.
Therefore, at the beginning, the abrasion of the filler is small, the sealing effect of the filler is good, the leakage amount of the high-pressure medium is small, the valve is in an open state, and the leaked high-pressure medium is discharged through the collecting pipe and the valve; the flowmeter can detect the leakage amount, and when the leakage amount detected by the flowmeter is less than the set amount, the valve is in an open state. After the leakage amount exceeds the set amount (namely the abrasion of the packing becomes larger and the sealing effect of the packing becomes worse at the moment), the valve is closed, the leaked high-pressure medium is stored in the collecting cavity, the hydraulic pressure in the collecting cavity becomes larger, so that the pressing part moves to the high-pressure side, and the pressing part radially presses the packing to form new sealing. After a new seal is formed, the packing prevents the high-pressure medium from leaking into the collection cavity, along with the reduction of the leakage amount of the high-pressure medium in the collection cavity and the movement of the pressing piece, the collection cavity becomes large, the pressure in the collection cavity becomes small, when the pressure detected by the pressure measuring instrument on the collection pipe is lower than a set value, the valve is opened, the pressing piece completely loses the thrust to stop moving, and a new stable packing sealing state is established. For the closing and opening of the valve, the valve can be manually closed or opened, and the closing or opening of the valve can also be controlled by a control system.
From this, through this scheme, the flowmeter detects letting out leakage quantity to can indirectly learn the wearing and tearing condition of packing, when letting out leakage quantity great, close the valve, collect the high pressure medium in the chamber and increase, collect the pressure grow in the chamber, thereby carry out axial extrusion in order to improve the leakproofness of packing to compressing tightly the piece. After the increase of the sealing performance of the packing, the pressure in the collecting cavity is reduced, and the pressure in the collecting cavity is detected through the pressure load cell, so that the sealing condition of the packing after the axial movement of the pressing piece can be indirectly known, the packing is guaranteed to be in an open state when being well sealed, the hydraulic pressure in the collecting cavity is reduced, the pressing piece can not continuously move towards the high-pressure medium side, and the sealing that the axial movement of the pressing piece is excessive and the subsequent packing is influenced is avoided. And after the filler is abraded again, the valve is closed again after the metering of the flowmeter on the leakage amount exceeds a set value, so that the process is repeated, and the filler can reach the next sealing state and circulate in sequence. Therefore, the scheme realizes the circular detection, feedback and the like of the sealing condition of the filler through the feedback detection control mechanism, is favorable for automatically compressing the filler in a proper state for multiple times, and improves the sensitivity of radial compression adjustment of the filler.
Preferably, as an improvement, the flow meter is provided with an alarm. From this, after pressing down the piece and removing the limit to the high pressure medium side, the radial self-tightening effect of hydraulic at this moment can become invalid (pressing down the piece and can not moving to the high pressure medium side), and the filler can not be radially compressed tightly, and high pressure medium lasts the leakage, and the flowmeter detects that high pressure medium leaks and lasts a period of time after, and the flowmeter gives the alarm with signal transmission, and the alarm can send alarm signal to instruct that the filler is sealed to need the maintenance, realize the autoalarm of maintenance promptly.
Preferably, as an improvement, the hydraulic self-tightening packing structure is a two-stage packing structure. And the two-stage packing sealing structure is adopted, so that the structure is simpler, and the two-stage packing sealing structure is more practical.
Drawings
FIG. 1 is a full cross-sectional view of a prior art packing arrangement.
Fig. 2 is a full sectional view of a hydraulic self-tightening packing structure according to embodiment 1.
Fig. 3 is a full cross-sectional view of the drogue of fig. 2.
Fig. 4 is a full sectional view of a hydraulic self-tightening packing structure according to embodiment 2.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a shaft 1, a gland 2, a pressure ring 3, a secondary stuffing box 4, a compression bushing 5, a third sealing ring 6, a primary stuffing box 7, a liquid discharge pipe 8, a first sealing ring 9, a second sealing ring 10, a stuffing pressing ring 11, primary stuffing 12, a compression piece 13, a front sleeve 14, a fourth sealing ring 15, a collecting pipe 16, a pressure manometer 17, a valve 18, a flowmeter 19, a small gap 20, a liquid inlet cavity 21, a collecting cavity 22, a second cavity 23, secondary stuffing 24, a first table surface 25, a stress surface 26, a second table surface 27, a sliding surface 28, a first side surface 29, a first inclined surface 30 and a second side surface 31.
Example 1
Substantially as shown in figures 2-3 of the drawings: the utility model provides a hydraulic self-tightening packing seal structure, hydraulic self-tightening packing seal structure is multistage packing seal structure, such as second grade, tertiary or fourth grade etc. two-stage packing seal structure is in this embodiment, including axle 1, first order packing sealing mechanism and second level packing sealing mechanism, first order packing sealing mechanism includes one-level stuffing box 7 and four rings of one-level packing 12, one-level stuffing box 7 cover is established on axle 1, be equipped with leading cover 14 and packing clamping ring 11 of cover on axle 1 in the one-level stuffing box 7, be equipped with fourth sealing washer 15 between leading cover 14 and the one-level stuffing box 7, leading cover 14 is located the right side of packing clamping ring 11, the right-hand member of leading cover 14 offsets with the right side inner wall of one-level stuffing box 7, one-level packing 12 is filled in the space that one-level stuffing box 7, axle 1, leading cover 14 and packing clamping ring 11 constitute. Second level packing mechanism includes second grade stuffing box 4 and two rings of second grade packings 24 in this embodiment, and 4 covers of second grade stuffing box are established on axle 1, and second grade stuffing box 4 is located the left side of one-level stuffing box 7, and the right-hand member of second grade stuffing box 4 is inserted into one-level stuffing box 7, is equipped with third sealing washer 6 between second grade stuffing box 4 and the one-level stuffing box 7, and the right-hand member of second grade stuffing box 4 offsets with packing clamping ring 11. Be stamped gland 2 in the left side of second grade gland box 4, 2 covers of gland are established on axle 1, it establishes the compressing bush 5 epaxial at 1 to be equipped with two covers in the second grade gland box 4, second grade packing 24 is filled at second grade gland box 4, axle 1, two compress tightly in the space that bush 5 constitutes, be equipped with the cover clamping ring 3 epaxial 1 between the right-hand member face of gland 2 and the left compressing bush 5, the left end of clamping ring 3 and the right-hand member face of gland 2 offset, through screwing up gland 2 like this, gland 2 extrudees clamping ring 3, the right-hand member of clamping ring 3 extrudees left compressing bush 5, make left compressing bush 5 extrude second grade packing 24 and realize sealing. Meanwhile, when the gland 2 is screwed down, the gland 2 extrudes the second-stage stuffing box 4 rightwards, the right end of the second-stage stuffing box 4 extrudes the packing pressing ring 11, and the packing pressing ring 11 extrudes the first-stage stuffing 12, so that the first-stage stuffing 12 is sealed by axial pressing force. Gland 2, second grade stuffing box 4 have constituted the subassembly that compresses tightly that extrudees one-level packing 12 in this embodiment, and the right-hand member of second grade stuffing box 4 is the end that compresses tightly. An axial flange is arranged on the compressing end. A small gap 20 is arranged between the pressing end and the shaft 1, and the small gap 20 in the embodiment is 0.1-0.15 mm.
In this embodiment, a pressing member 13 that applies a radial pressing force to the filler is disposed between the first-stage filler 12 and the first-stage filler box 7, the pressing member 13 in this embodiment is a taper sleeve, the pressing member 13 is sleeved between the first-stage filler 12 and the first-stage filler box 7, as shown in fig. 3, the pressing member 13 has a large left end and a small right end, the diameter of the left end is larger than that of the right end, the circumferential outer side surface of the left end is a first side surface 29 attached to the inner wall of the first-stage filler box 7, the circumferential outer side surface of the right end is a second side surface 31 attached to the inner wall of the first-stage filler box 7, and a first table surface 25 is disposed between the first side surface; the medial surface of the tip of compressing tightly 13 is first inclined plane 30, and the internal diameter that compresses tightly 13 tip is crescent from a left side to the right side, and the medial surface of the tip of compressing tightly 13 is the glide plane 28 that pastes with packing clamping ring 11 outer wall, and the diameter of glide plane 28 is less than the diameter of first inclined plane 30, forms second mesa 27 between glide plane 28 and the first inclined plane 30, and the left end face that compresses tightly 13 is stress surface 26. In this embodiment, the circumferential outer sidewall of the secondary packing 24 is a second inclined surface attached to the first inclined surface 30, and the diameter of the second inclined surface gradually increases from left to right.
As shown in fig. 2, the flange of the compacting end of the secondary stuffing box 4, the force-bearing surface 26 of the compacting member 13 and the inner wall of the primary stuffing box 7 in this embodiment form an annular collection chamber 22. The side wall of the pressing end close to the shaft 1 is provided with an annular liquid inlet cavity 21 communicated with the collecting cavity 22, and an annular channel is communicated between the liquid inlet cavity 21 and the collecting cavity 22. The area of the end face of the stressed part of the pressing piece 13 is larger than that of the end face of the right end of the pressing piece 13. A first sealing ring 9 is arranged between the second-stage stuffing box 4 and the first-stage stuffing box 7, a second sealing ring 10 is arranged between the large end of the pressing piece 13 and the stuffing box, and the first sealing ring 9, the second sealing ring 10, the third sealing ring 6 and the fourth sealing ring 15 in the embodiment are all O-shaped sealing rings. The first-stage stuffing box 7 is provided with a first abutting part used for abutting against the first table-board 25 of the pressing piece 13 and a second abutting part used for abutting against the small end of the pressing piece 13, a first cavity is formed between the first abutting part and the first table-board 25 of the large end of the pressing piece 13, a second cavity 23 is formed between the second abutting part and the small end of the pressing piece 13, and the axial length of the first cavity is greater than that of the second cavity 23.
The specific implementation process is as follows: the axial sealing of the packing in this embodiment belongs to the prior art, and is not described herein again, focusing on describing the radial sealing process of the packing:
initially, one-level 12 packing's sealed effect is better, and along with the use of this structure, one-level 12 packing can be worn and torn to make one-level 12 packing and the clearance between the axle 1 grow and make the leakproofness variation, another one-level 12 packing wearing and tearing back, one-level 12 packing's volume diminishes, under the unchangeable condition in one-level stuffing box 7 space, the relaxation that one-level 12 packing can become, thereby make one-level 12 packing's sealing performance variation. After the sealing performance of the primary packing 12 becomes poor, a high-pressure medium at the right end of the shaft 1 enters the primary packing box 7 leftwards along the shaft 1 through the loose primary packing 12, only a small amount of high-pressure medium leaks through a small gap 20 formed between the pressing end and the shaft 1, a large amount of high-pressure medium preferentially enters the collecting cavity 22 from the liquid inlet cavity 21, the high-pressure medium in the collecting cavity 22 becomes more, the hydraulic pressure in the collecting cavity 22 becomes higher, the high-pressure medium in the collecting cavity 22 presses the force bearing surface 26 at the left end of the pressing piece 13 rightwards, so that the pressing piece 13 slides rightwards, and as the diameter of the first inclined surface 30 gradually becomes larger from left to right, when the pressing piece 13 slides rightwards, the pressing piece 13 presses the primary packing 12 radially, so that the primary packing 12 is in closer contact with the shaft 1, the primary packing 12 becomes more compact, and the high-pressure medium is prevented from leaking into the packing box through the primary packing 12, the sealing effect of the primary packing 12 is improved. When the primary packing 12 is radially compressed, the leakage amount of the high-pressure medium is reduced, the high-pressure medium does not supplement new liquid to the collection cavity 22 any more, and the compressing member 13 is slowed down or does not move in the rightward direction.
With the use of the primary packing 12, the primary packing 12 is worn again, the sealing performance of the primary packing 12 is reduced, the high-pressure medium on the high-pressure medium side continuously supplements new high-pressure medium into the collection cavity 22 under the action of the self pressure, so that the pressure in the collection cavity 22 is increased, the pressing piece 13 is pushed to move rightwards continuously, the pressing piece 13 radially extrudes the primary packing 12 again, and a new sealing state of automatically and radially pressing the packing is established.
By analogy, the first-stage filler 12 can be radially compressed along with the rightward gradual movement of the compressing piece 13, so that the first-stage filler 12 can be automatically and radially compressed for many times.
In addition, in this embodiment, due to the existence of the second table 27 on the pressing member 13, when the pressing member 13 moves from left to right, the second table 27 may abut against the first-stage packing 12, so as to provide an axial rightward extrusion force to the first-stage packing 12, and further make a gap between adjacent first-stage packing 12 smaller, so that this embodiment can also play a role in preventing the high-pressure medium from radially leaking through the gap between adjacent first-stage packing 12.
It will be readily understood that the structure of the pressing member 13 and the manner of pressing the primary packing 12 are not limited thereto, for example, the pressing member 13 is hollow inside and communicates with the collection chamber 22, the pressing member 13 has elasticity, and the pressing member 13 expands by filling the leaked high-pressure medium into the pressing member 13, thereby pressing the primary packing 12. Or the collecting cavity 22 is positioned between the pressing piece 13 and the primary stuffing box 7, when the hydraulic pressure in the collecting cavity 22 becomes large, the hydraulic pressure in the collecting cavity 22 directly applies radial pressure on the pressing piece 13. Of course, the pressing member 13 may not be a taper sleeve structure, but may be a plurality of strip-shaped or rod-shaped structures located around the circumference of the primary packing 12, as long as the primary packing 12 can be radially pressed.
Example 2
Referring to fig. 4, a collecting pipe 16 is communicated with a collecting cavity 22, a feedback detection control mechanism is arranged on the collecting pipe 16, the feedback detection control mechanism in the embodiment comprises a controller, a flowmeter 19 for detecting the leakage amount of the high-pressure medium, a valve 18 for controlling whether the collecting pipe 16 is communicated with the collecting pipe 16 and a pressure measuring instrument 17 for detecting the hydraulic pressure of the high-pressure medium in the collecting pipe 16, an alarm is connected to the flowmeter 19, the valve 18 and the pressure measuring instrument 17, all of which are electrically connected with the controller, the flowmeter 19 in the embodiment generally selects a positive displacement flowmeter (the leakage amount is extremely small, and the flow can be determined only by collecting the leaked medium within a certain time), such as a rotor flowmeter with model L ZXYB8GP-BA0-X4, the valve 18 generally selects an electric needle type valve, such as model DJ23W-160P, however, the flowmeter 19 and the valve 18 generally determine different forms according to the size of a shaft 1, the pressure measuring instrument generally selects a type with signal output, such as model WP435A, and the pressure measuring instrument directs the valve sleeve 18 to close to realize the pushing movement of the collecting sleeve to push the collecting pipe 22.
Initially, the abrasion of the first-stage packing 12 is small, the sealing effect of the first-stage packing 12 is good, the leakage amount of the high-pressure medium is small, the valve 18 is in an open state, and the leaked high-pressure medium is discharged through the collecting pipe 16 and the valve 18; the flow meter 19 can detect the amount of leakage, and when the amount of leakage detected by the flow meter 19 is smaller than a set amount, the valve 18 is in an open state. When the leakage amount exceeds the set amount (that is, the abrasion of the primary packing 12 becomes large at this time, the sealing effect of the primary packing 12 becomes poor), the flowmeter 19 feeds back a signal to the controller, the controller controls the valve 18, the valve 18 is automatically closed, the leaked high-pressure medium is stored in the collection cavity 22, the hydraulic pressure in the collection cavity 22 becomes large, so that the pressing part 13 moves to the high-pressure side, and the pressing part 13 radially presses the primary packing 12 to form a new seal. After a new seal is formed, the primary packing 12 prevents the high-pressure medium from leaking into the collection cavity 22, along with the reduction of the leakage amount of the high-pressure medium in the collection cavity 22 and the rightward movement of the pressing piece 13, the collection cavity 22 becomes larger, the pressure in the collection cavity 22 becomes smaller, and when the pressure detected by the pressure measuring instrument 17 on the collection pipe 16 is lower than a set value, a signal is sent to the controller, the controller enables the valve 18 to be automatically opened, the pressing piece 13 completely loses the thrust force to stop moving, and a new stable packing sealing state is established. When the flowmeter 19 detects that the leakage amount exceeds the set amount again, the flowmeter 19 feeds back a signal to the controller again, the controller controls the valve 18, the valve 18 is automatically closed, the leaked high-pressure medium is stored in the collection cavity 22, the hydraulic pressure in the collection cavity 22 is increased, so that the pressing piece 13 continues to move towards the high-pressure side, and the pressing piece 13 radially presses the primary packing 12 to form new sealing. After a new seal is formed, when the pressure detected by the pressure measuring instrument 17 is lower than the set value again, a signal is sent to the controller, the controller enables the valve 18 to be automatically opened, the pressing piece 13 completely loses the thrust again to stop moving, and a new stable packing sealing state is established again. And the like, the radial pressure sealing is applied to the first-stage packing 12 for multiple times. The automatic discharge and storage of high-pressure media in the collection cavity 22 are realized through the pressure load meter 17, the flowmeter 19 and the valve 18 in the embodiment, so that the pressing piece 13 can automatically move rightwards according to different wear states of the primary packing 12 to radially extrude the primary packing 12, manual control is not needed, and the automatic discharge and storage are more automatic.
Example 3
It will be readily appreciated that in this embodiment the valve 18 can be manually controlled to close and open based on the amount of leakage detected by the flow meter 19 and the pressure detected by the pressure load cell 17.
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The utility model provides a hydraulic self-tightening packing structure, includes the axle, the cover establish epaxial stuffing box, be located the packing in the stuffing box and be used for applying the compressing tightly subassembly of packing axial, its characterized in that: the high-pressure medium collecting device further comprises a collecting cavity for collecting leaked high-pressure medium, a pressing piece for applying radial pressing force to the filler is arranged between the filler and the filler box, and the power of the pressing piece for applying the radial pressing force to the filler is generated by the high-pressure medium collected in the collecting cavity.
2. A liquid self-tightening packing structure according to claim 1, wherein: the axial sliding connection of the pressing piece is between the stuffing box and the stuffing, the side surfaces of the pressing piece and the stuffing, which are mutually attached, are inclined surfaces, and the pressing piece axially moves from the low end to the high end of the stuffing inclined surface under the action of the hydraulic pressure of a high-pressure medium.
3. A liquid self-tightening packing structure according to claim 2, wherein: the area of the end face of one end, subjected to hydraulic pressure, of the pressing piece is larger than that of the end face of the other end of the pressing piece.
4. A liquid self-tightening packing structure according to claim 2, wherein: the pressing piece is a taper sleeve, and the taper sleeve is sleeved on the outer side of the filler.
5. A liquid self-tightening packing structure according to claim 4, characterized in that: the collecting cavity is annular, and sealing rings are arranged between the pressing component and the stuffing box and between the taper sleeve and the stuffing box.
6. A liquid self-tightening packing structure according to claim 2, wherein: the compression assembly comprises a compression end, a flange is arranged on the compression end, and the flange, the inner wall of the stuffing box and the side surface of one end of the compression piece enclose to form the collection cavity; the compressing end is attached to the side wall of the shaft and is provided with a liquid inlet cavity communicated with the collecting cavity.
7. A liquid self-tightening packing structure according to claim 5, characterized in that: the stuffing box is provided with a first abutting part used for abutting against the large end of the pressing part and a second abutting part used for abutting against the small end of the pressing part, the first abutting part and the large end of the pressing part form a first cavity, the second abutting part and the small end of the pressing part form a second cavity, and the axial length of the first cavity is greater than that of the second cavity.
8. A liquid self-tightening packing structure according to claim 2, wherein: the collecting cavity is communicated with a collecting pipe, the collecting pipe is provided with a feedback detection control mechanism, and the feedback detection control mechanism comprises a flowmeter for detecting the leakage rate of the high-pressure medium, a valve for controlling whether the collecting pipe is communicated and a pressure manometer for detecting the pressure of the high-pressure medium in the collecting pipe; when the flowmeter detects that the leakage amount is higher than a set value, the valve is closed; and when the pressure measuring instrument detects that the hydraulic pressure is lower than a set value, the valve is opened.
9. A liquid self-tightening packing structure according to claim 8, wherein: the flowmeter is connected with an alarm.
10. A liquid self-tightening packing structure according to any one of claims 1 to 9, wherein: the hydraulic self-tightening packing sealing structure is a two-stage packing sealing structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010412837.2A CN111486233A (en) | 2020-05-15 | 2020-05-15 | Hydraulic self-tightening packing sealing structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010412837.2A CN111486233A (en) | 2020-05-15 | 2020-05-15 | Hydraulic self-tightening packing sealing structure |
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| CN202010412837.2A Pending CN111486233A (en) | 2020-05-15 | 2020-05-15 | Hydraulic self-tightening packing sealing structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211815A (en) * | 2020-10-22 | 2021-01-12 | 重庆水泵厂有限责任公司 | Reciprocating pump plunger seal structure |
| CN112254896A (en) * | 2020-09-08 | 2021-01-22 | 合肥通用机械研究院有限公司 | Performance test device and test method for filler sealing system for angular travel valve rod |
| CN117145972A (en) * | 2023-11-01 | 2023-12-01 | 自贡市川密机械密封件有限公司 | Mechanical sealing device with adjustable sealing pressure |
-
2020
- 2020-05-15 CN CN202010412837.2A patent/CN111486233A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112254896A (en) * | 2020-09-08 | 2021-01-22 | 合肥通用机械研究院有限公司 | Performance test device and test method for filler sealing system for angular travel valve rod |
| CN112254896B (en) * | 2020-09-08 | 2023-12-05 | 合肥通用机械研究院有限公司 | Performance test device and test method for packing sealing system for angular travel valve rod |
| CN112211815A (en) * | 2020-10-22 | 2021-01-12 | 重庆水泵厂有限责任公司 | Reciprocating pump plunger seal structure |
| CN112211815B (en) * | 2020-10-22 | 2022-07-01 | 重庆水泵厂有限责任公司 | Reciprocating pump plunger seal structure |
| CN117145972A (en) * | 2023-11-01 | 2023-12-01 | 自贡市川密机械密封件有限公司 | Mechanical sealing device with adjustable sealing pressure |
| CN117145972B (en) * | 2023-11-01 | 2024-01-02 | 自贡市川密机械密封件有限公司 | Mechanical sealing device with adjustable sealing pressure |
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