CN213808854U

CN213808854U - Packing seal unit and packing seal device

Info

Publication number: CN213808854U
Application number: CN202022633022.5U
Authority: CN
Inventors: 焦晓政; 孙科; 郭强; 陈晓玲
Original assignee: China Petroleum and Chemical Corp; Sinopec Catalyst Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Catalyst Co
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-07-27
Anticipated expiration: 2030-11-13

Abstract

The utility model relates to a packing technical field specifically relates to a packing unit and packing sealing device. The packing unit is of an annular structure, an inner ring of the packing unit forms a first axial hole for the main shaft to penetrate through, the packing unit comprises a top packing layer, a middle packing layer and a bottom packing layer which are sequentially stacked from top to bottom, the top packing layer comprises at least one first woven packing (10), the bottom packing layer comprises at least one second woven packing (13), the first woven packing (10) and the second woven packing (13) are respectively provided with a notch allowing the main shaft to be radially loaded and unloaded, and the notch is obliquely arranged relative to the cross section of the main shaft. The top packing layer and the bottom packing layer in the packing sealing unit are convenient to replace and have good sealing performance.

Description

Packing seal unit and packing seal device

Technical Field

The utility model relates to a packing technical field specifically relates to a packing unit and packing sealing device.

Background

The reaction kettle is a stainless steel container with physical or chemical reaction, the structural design and parameter configuration of the container are carried out according to different process condition requirements, and the design conditions, the process, the inspection, the manufacture and the acceptance are required according to related technical standards so as to realize the heating, the evaporation, the cooling and the low-speed and high-speed mixing reaction functions required by the process. In the process of material mixing reaction in the reaction kettle, the stirring is required to be carried out through the rotation of the stirrer and the stainless steel shaft, and in order to ensure the sealing performance of the reaction kettle in the reaction process, a sealing device sleeved outside the stirring shaft is generally required to be arranged at the opening of the reaction kettle for sealing. The sealing form that packing and V type drilled packing ring combination were woven to square tangent plane has appeared among the prior art, and the packing of weaving that is located top and bottom usually is damaged easily, and it is higher to change the frequency, changes the difficulty, and the sealing performance that is located the packing of weaving of top and bottom simultaneously is also relatively poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a packing seal unit and packing sealing device in order to overcome the fragile top packing layer and the relatively poor problem of bottom packing layer change difficulty that form by weaving the packing that prior art exists, the convenient and sealing performance is better for top packing layer and the bottom packing layer change in this packing seal unit.

In order to realize the above-mentioned purpose, the utility model provides an aspect provides a packing seal unit, packing seal unit is the loop configuration, packing seal unit's inner ring forms the first axial hole that is used for the main shaft to pass, packing seal unit is including top packing layer, middle part packing layer and the bottom packing layer that from top to bottom piles up in proper order, the top packing layer includes at least one first packing of weaving, the packing is woven including at least one second to the bottom packing layer, first packing of weaving with the second is woven and has seted up the permission on the packing respectively and follow the radial loading and unloading of main shaft first packing of weaving with the incision that the packing was woven to the second, the incision for the cross section slope of main shaft sets up.

Preferably, the middle packing layer comprises top packing, middle packing and bottom packing which are stacked in sequence from top to bottom, the top end face of the top packing is a plane, the bottom end face of the top packing is a V-shaped convex surface, the middle packing comprises at least one V-shaped packing with a V-shaped section, the top end face of the bottom packing is a V-shaped concave surface, and the bottom end face of the bottom packing is a plane.

Preferably, the first braided packing and the second braided packing are both graphite braided packing; and/or the presence of a gas in the gas,

the top layer filler, the V-shaped filler and the bottom layer filler are all graphite filler rings.

Preferably, the top packing layer includes a plurality of stacked first woven packing groups, the notches of the plurality of first woven packing groups are staggered in a stacking direction, the bottom packing layer includes a plurality of stacked second woven packing groups, and the notches of the plurality of second woven packing groups are staggered in the stacking direction; and/or the presence of a gas in the gas,

the inclination angle of the notch is 30-60 degrees.

The utility model discloses the second aspect provides a packing sealing device, packing sealing device includes the stuffing box and as above the packing seal unit, the stuffing box has and is used for the main shaft pass and with the second axial hole that first axial hole corresponds, the stuffing box includes tank wall structure, tank wall structure is injectd there is the packing chamber, the packing seal unit set up in the packing chamber, the outer wall of packing seal unit with tank wall structure's internal face laminating, the internal face of packing seal unit with the main shaft laminating.

Preferably, the tank wall structure comprises a tank side wall and a cooling jacket sleeved outside the tank side wall, wherein the cooling jacket comprises an annular jacket wall and an annular cavity formed inside the annular jacket wall and used for introducing cooling water.

Preferably, the cooling water inlet of the annular cavity is arranged lower than the cooling water outlet of the annular cavity; and/or the presence of a gas in the gas,

the top end of the annular cavity is higher than the top end of the packing sealing unit, and the bottom end of the annular cavity is close to the bottom end of the packing sealing unit.

Preferably, the tank side wall includes a first section and a second section having an outer diameter larger than that of the first section and connected to a bottom end of the first section, the cooling jacket is sleeved outside the first section, and a bottom end of the cooling jacket abuts against a top end face of the second section extending out of the first section.

Preferably, the tank sidewall comprises a third section connected to the bottom end of the second section, the third section having an outer diameter smaller than the outer diameter of the second section and larger than the outer diameter of the first section; and/or the presence of a gas in the gas,

an annular step part is formed on the inner wall surface of the second section, and the bottom end of the packing sealing unit abuts against the upper step surface of the annular step part.

Preferably, the stuffing box comprises a stuffing gland which is covered on the top end of the box wall structure, the stuffing gland comprises a compression end which is positioned at the bottom and a cover end which is connected with the top end surface of the compression end, the compression end is contacted with the top surface of the stuffing sealing unit to compress the stuffing sealing unit, and the cover end is positioned above the box wall structure and is connected with the cooling jacket through a connecting piece.

Through the technical scheme, the inclined notches are formed in the first woven packing 10 in the top packing layer and the second woven packing 13 in the bottom packing layer, so that the sealing performance of the top packing layer and the bottom packing layer can be improved, and meanwhile, when the top packing layer and the bottom packing layer need to be replaced, the top packing layer and the bottom packing layer can be radially disassembled and assembled from the main shaft, other parts on the main shaft do not need to be disassembled and assembled, the disassembly and the replacement are convenient, and the replacement efficiency is improved; the top packing layer plays a role in protection and sealing, and prevents the middle packing layer from being excessively worn due to the entry of foreign matters; the bottom packing layer plays the effect of support and protection, prevents that the material from getting into to lead to packing wearing and tearing.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a stuffing seal according to the present invention;

FIG. 2 is a cross-sectional view taken along plane B-B of the stuffing seal shown in FIG. 1;

fig. 3 is a cross-sectional view of a V-shaped packing in the packing seal of fig. 2.

Description of the reference numerals

1. A cap end; 2. a compression end; 3. a cooling jacket; 4. a second stage; 5. a third stage; 6. a first stage; 7. an annular cavity; 8. a connecting portion; 9. a V-shaped filler; 10. a first braided packing; 11. top layer filler; 12. bottom layer filling; 13. and weaving the packing for the second time.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

In the present invention, unless otherwise specified, the use of directional terms such as "upper" and "lower" is generally in accordance with the orientation shown in the accompanying drawings.

The utility model discloses an aspect provides a packing seal unit, packing seal unit is applicable to among the reation kettle. The packing seal unit is the loop configuration, the inner ring of packing seal unit forms the first axial hole that is used for the main shaft to pass, the packing seal unit is including top packing layer, middle part packing layer and the bottom packing layer that from top to bottom piles up in proper order, the top packing layer includes that at least one is first to weave packing 10, packing 13 is woven to the bottom packing layer including at least one second, first weave packing 10 with the second is woven and is seted up the permission on packing 13 and followed radial loading and unloading of main shaft first weave packing 10 with packing 13's incision is woven to the second, the incision for the cross section slope setting of main shaft. I.e. the two faces forming the cut-out are matching chamfer faces in a plane which is inclined, rather than perpendicular, with respect to the cross-section of the spindle. When the first woven packing 10 and the second woven packing 13 need to be taken down from the main shaft, the two attached oblique planes are separated to form a larger opening, so that the first woven packing 10 and the second woven packing 13 can be taken down along the radial direction of the main shaft without disassembling parts such as a bearing box at the top of the main shaft (namely, without taking out the parts from the top end of the main shaft), and the purpose of replacing the first woven packing 10 and the second woven packing 13 can be realized; meanwhile, the designed medium is not easy to leak from the gap of the two attached oblique cutting surfaces, the oblique cutting surfaces forming the oblique cuts can have a certain blocking effect on the medium, and the sealing performance is better. When the device is used, the inner wall surface of the packing sealing unit is attached to a main shaft (namely a stirring shaft in a reaction kettle).

Preferably, the middle packing layer is composed of an expanded graphite packing ring, and the first woven packing 10 and the second woven packing 13 are respectively reinforced graphite woven packing. The reinforced graphite woven packing has good flexibility and high strength, but the lubricating property is poorer than that of an expanded graphite packing ring, if the packing is singly used and easily burnt by over-temperature, the packing is used for the bottom and the top of a packing cavity to play the roles of positioning and sealing the graphite packing ring, and the graphite powder which is worn and shed by the graphite packing ring plays the role of lubricating the graphite woven packing.

As an embodiment, as shown in fig. 2, the middle packing layer includes a top packing 11, a middle packing and a bottom packing 12 stacked in sequence from top to bottom, the top end surface of the top packing 11 is a plane, the bottom end surface of the top packing 11 is a V-shaped convex surface, the middle packing includes at least one V-shaped packing 9 (as shown in fig. 3) with a V-shaped section, the top end surface of the bottom packing 12 is a V-shaped concave surface, and the bottom end surface of the bottom packing 12 is a plane. By adopting the form of the combined packing seal, the sealing performance is improved and the service life is prolonged. As another embodiment, the bottom end surface of the top layer filler 11 may also be a V-shaped concave surface, the middle layer filler includes at least one V-shaped filler with an inverted V-shaped section, and correspondingly, the top end surface of the bottom layer filler 12 is a V-shaped convex surface.

In one embodiment, the first braided packing 10 and the second braided packing 13 are both graphite braided packing.

In one embodiment, the top filler 11, the V-shaped filler 9 and the bottom filler 12 are graphite filler rings. After the V-shaped expanded graphite packing ring is extruded by the packing gland, the V-shaped opening is expanded along the radial direction preferentially to form a local high-stress annular area, the contact stress of the sealing surface far away from the V-shaped packing 9 is smaller, so that the effect similar to labyrinth seal is established, and the local preferential expansion of the V-shaped packing is favorable for the compaction and radial expansion of the bottom packing 12.

In one embodiment, the top packing layer includes a plurality of stacked first woven packings 10, the notches of the plurality of first woven packings 10 are arranged in a staggered manner in a stacking direction, the bottom packing layer includes a plurality of stacked second woven packings 13, and the notches of the plurality of second woven packings 13 are arranged in a staggered manner in the stacking direction. Such a design may further improve the sealing.

In one embodiment, the oblique angle of the notch is 30-60 degrees. Preferably 45 degrees. The angle of inclination is relative to the plane in which the cross-section of the main shaft lies.

The utility model discloses the second aspect provides a packing sealing device, packing sealing device is applicable to reation kettle, specifically, this packing sealing device installs at reation kettle's opening part to be located between reation kettle and the bearing box. The packing sealing device comprises a packing box and a packing sealing unit as described above, the packing box is provided with a second axial hole for the main shaft to pass through and correspond to the first axial hole, the packing box comprises a box wall structure, the box wall structure is limited with a packing cavity, the packing sealing unit is arranged in the packing cavity, the outer wall surface of the packing sealing unit is attached to the inner wall surface of the box wall structure, and the inner wall surface of the packing sealing unit is attached to the main shaft (namely a stirring shaft in a reaction kettle). During normal installation, pack the packing seal unit in proper order in the stuffing box, because the graphite that is located top and bottom weaves the packing (first packing 10 and the packing 13 is woven to the second promptly) is damaged easily, when needing to be changed, reation kettle's (main shaft promptly) shifts up, makes the packing seal unit shift out the stuffing box, through the incision can make first packing 10 and the packing 13 of weaving of second follow the radial of (mixing) shaft shift out, and the packing is woven to the graphite of more renewing, again from the radial installation of (mixing) shaft, then makes two bevels that constitute the scarf form annular graphite weave the packing.

As an embodiment, as shown in fig. 2, the tank wall structure comprises a tank side wall and a cooling jacket 3 sleeved outside the tank side wall, and the cooling jacket 3 comprises an annular jacket wall and an annular cavity 7 formed inside the annular jacket wall and used for introducing cooling water. By changing the box wall structure of the packing box, the structure of the packing box is optimized, a water-cooling heat exchange technology is added, friction and redundant heat generated in the reaction kettle are taken away through heat exchange, the sealing temperature is reduced, and the service life of the reinforced graphite braided packing is prolonged; the outside of case lateral wall is located with cooling jacket 3 cover simultaneously, when needing to be changed, only change cooling jacket 3 can, need not to change whole tank wall structure, and will be used for leading to the cavity of cooling water and set up in cooling jacket 3's inside, and the leakproofness can be guaranteed.

In one embodiment, the cooling water inlet of the annular cavity 7 is arranged lower than the cooling water outlet of the annular cavity 7.

As an embodiment, as shown in fig. 2, a top end of the annular cavity 7 is disposed higher than a top end of the stuffing sealing unit, and a bottom end of the annular cavity 7 is disposed close to the bottom end of the stuffing sealing unit. I.e. the bottom end of the stuffing seal unit is slightly lower than the bottom end of the annular cavity. The heat exchange effect of the design is better.

As an embodiment, as shown in fig. 1-2, the tank sidewall includes a first section 6 and a second section 4 having an outer diameter larger than that of the first section 6 and connected to a bottom end of the first section 6, the cooling jacket 3 is sleeved outside the first section 6, and a bottom end of the cooling jacket 3 abuts against a top end surface of the second section 4 extending out of the first section 6. The design can lead the second section 4 to limit the cooling jacket 3, thereby improving the stability of the structure. And a connecting hole for connecting the second section 4 with the reaction kettle is formed in the part, extending out of the cooling jacket 3, of the second section.

In one embodiment, as shown in fig. 1-2, the tank side wall comprises a third section 5 connected to the bottom end of the second section 4, the third section 5 having an outer diameter smaller than the outer diameter of the second section 4 and larger than the outer diameter of the first section 6. After the installation, third section 5 stretches into to reation kettle from reation kettle's opening, then is connected with reation kettle through second section 4, and such design has strengthened bottom pressure-bearing position, can guarantee the bulk strength and the static leakproofness of stuffing box. In one embodiment, an annular step portion is formed on an inner wall surface of the second section 4, and a bottom end of the packing seal unit abuts against an upper step surface of the annular step portion. The annular step portion is used for supporting the packing seal unit.

As an embodiment, as shown in fig. 1-2, the stuffing box includes a stuffing cover covering the top end of the box wall structure, the stuffing cover includes a compressing end 2 at the bottom and a cover end 1 connected to the top end surface of the compressing end 2, the compressing end 2 contacts with the top surface of the stuffing sealing unit to compress the stuffing sealing unit, and the cover end 1 is located above the box wall structure and connected to the cooling jacket 3 through a connecting piece. The cooling jacket 3 comprises a connecting part 8 positioned at the top, the cover end 1 is connected with the connecting part 8, and the annular cavity is positioned below the connecting part. Packing gland passes through lid end 1 and is connected with cooling jacket 3, and lid end 1 carries on spacingly and fixed connection to cooling jacket 3 from the top of cooling jacket 3, and second section 4 carries on spacingly to cooling jacket 3 from the bottom of cooling jacket 3 to on the case major structure who is fixed in case lateral wall and gland formation with cooling jacket 3 is firm, can strengthen structural performance. Preferably, the height of the pressing end 2 which can extend into the reaction kettle is prolonged to improve the adjustment allowance at the later stage.

During installation, the stuffing box is installed firstly, then the stuffing sealing unit is installed, and the stuffing sealing unit adopts a mode of filling and fastening in times. Specifically, part of the filler is placed in a filler cavity for one-time fastening, and the fastening force is paid attention to; and after the residual filler is put in, a rotary fastening mode is adopted, and finally, the residual filler is fastened again according to the pressure test condition. The reinforced graphite braided packing (namely, the second braided packing 13) at the bottom plays a role in supporting and protecting, and the packing is prevented from being worn due to the entering of materials; the V-shaped packing 9 of middle part packing layer is warp to both sides after bearing pressure, forms the labyrinth seal effect, and the reinforcing graphite of upper strata is woven packing (being first packing 10 of weaving) and is played protection and sealed effect, prevents that the foreign matter from getting into and the excessive wearing and tearing of graphite packing effect. The scheme solves the problem of frequent leakage of the seal of the crystallization kettle, enhances the sealing effect, prolongs the service life of the seal, reduces the maintenance difficulty and maintenance times, and improves the operation stability of the reaction kettle; the scheme adds the cooling jacket 3 for water cooling heat exchange, takes away redundant heat, reduces the sealing temperature and prolongs the service life; the combined mode of the packing sealing unit in the scheme has better sealing effect.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical scheme of the utility model in the technical conception scope, can be right carry out multiple simple variant. Including each of the specific features, are combined in any suitable manner. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. The utility model provides a packing seal unit, its characterized in that, packing seal unit is the loop configuration, packing seal unit's inner ring forms the first axial hole that is used for the main shaft to pass, packing seal unit is including top packing layer, middle part packing layer and the bottom packing layer that from top to bottom piles up in proper order, the top packing layer includes that at least one is first to weave packing (10), packing (13) are woven to the bottom packing layer including at least one second, first packing (10) of weaving with seted up respectively on packing (13) is woven to the second and allowed to follow packing (13) is first weave packing (10) with the incision that packing (13) were woven to the second, the incision for the cross section slope of main shaft sets up.

2. The packing seal unit according to claim 1, wherein the middle packing layer comprises a top packing (11), a middle packing and a bottom packing (12) stacked in sequence from top to bottom, the top end face of the top packing (11) is a plane, the bottom end face of the top packing (11) is a V-shaped convex surface, the middle packing comprises at least one V-shaped packing (9) with a V-shaped section, the top end face of the bottom packing (12) is a V-shaped concave surface, and the bottom end face of the bottom packing (12) is a plane.

3. The stuffing seal unit of claim 2, wherein:

the first braided packing (10) and the second braided packing (13) are both graphite braided packing; and/or the presence of a gas in the gas,

the top layer filler (11), the V-shaped filler (9) and the bottom layer filler (12) are all graphite filler rings.

4. The stuffing seal unit according to any of claims 1 to 3, wherein:

the top packing layer comprises a plurality of stacked first woven packing (10), the notches on the plurality of first woven packing (10) are arranged in a staggered mode along a stacking direction, the bottom packing layer comprises a plurality of stacked second woven packing (13), and the notches on the plurality of second woven packing (13) are arranged in a staggered mode along the stacking direction; and/or the presence of a gas in the gas,

the inclination angle of the notch is 30-60 degrees.

5. A stuffing seal according to any of claims 1 to 4, comprising a stuffing box having a second axial bore for the spindle to pass through and corresponding to the first axial bore and a stuffing seal unit according to any of claims 1 to 4, the stuffing box comprising a box wall structure defining a stuffing chamber, the stuffing seal unit being disposed within the stuffing chamber, an outer wall surface of the stuffing seal unit being in abutment with an inner wall surface of the box wall structure, an inner wall surface of the stuffing seal unit being in abutment with the spindle.

6. The stuffing seal according to claim 5, characterised in that the tank wall construction comprises a tank side wall and a cooling jacket (3) which is placed on the outside of the tank side wall, the cooling jacket (3) comprising an annular jacket wall and an annular cavity (7) for the passage of cooling water formed inside the annular jacket wall.

7. The stuffing seal of claim 6, wherein:

a cooling water inlet of the annular cavity (7) is lower than a cooling water outlet of the annular cavity (7); and/or the presence of a gas in the gas,

the top end of the annular cavity (7) is higher than the top end of the packing sealing unit, and the bottom end of the annular cavity (7) is close to the bottom end of the packing sealing unit.

8. The stuffing seal according to claim 6, characterized in that the tank side wall comprises a first section (6) and a second section (4) having an outer diameter larger than the first section (6) and connected to the bottom end of the first section (6), the cooling jacket (3) is sleeved outside the first section (6) and the bottom end of the cooling jacket (3) abuts against the top end face of the second section (4) extending out of the first section (6).

9. The stuffing seal of claim 8, wherein:

the side wall of the tank comprises a third section (5) connected with the bottom end of the second section (4), and the outer diameter of the third section (5) is smaller than that of the second section (4) and larger than that of the first section (6); and/or the presence of a gas in the gas,

an annular step part is formed on the inner wall surface of the second section (4), and the bottom end of the packing sealing unit is abutted against the upper step surface of the annular step part.

10. The stuffing seal according to any of claims 6 to 9, characterized in that the stuffing box comprises a stuffing cover covering the top end of the tank wall structure, the stuffing cover comprising a pressing end (2) at the bottom and a cover end (1) connected to the top end face of the pressing end (2), the pressing end (2) being in contact with the top face of the stuffing seal unit to press the stuffing seal unit, the cover end (1) being located above the tank wall structure and connected to the cooling jacket (3) by a connecting piece.