CN111878582A - Double-packing sealing shaft - Google Patents

Double-packing sealing shaft Download PDF

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Publication number
CN111878582A
CN111878582A CN202010726871.7A CN202010726871A CN111878582A CN 111878582 A CN111878582 A CN 111878582A CN 202010726871 A CN202010726871 A CN 202010726871A CN 111878582 A CN111878582 A CN 111878582A
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CN
China
Prior art keywords
wall
ring
packing
shaft
hollow shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010726871.7A
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Chinese (zh)
Inventor
杨胜华
刘绍川
杨岳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Sunkaier Industrial Technology Co ltd
Original Assignee
Jiangsu Sunkaier Industrial Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Sunkaier Industrial Technology Co ltd filed Critical Jiangsu Sunkaier Industrial Technology Co ltd
Priority to CN202010726871.7A priority Critical patent/CN111878582A/en
Publication of CN111878582A publication Critical patent/CN111878582A/en
Pending legal-status Critical Current

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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
    • 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
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • 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
    • F16J15/3452—Pressing means the pressing force resulting from the action of a spring
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)

Abstract

The invention discloses a double-packing seal shaft which comprises a hollow shaft (1), wherein a mounting base plate (2) is arranged at the bottom of the hollow shaft (1), a first packing box (6) sleeved outside the hollow shaft (1) is arranged on the mounting base plate (2), a first packing group (7) is filled in a first annular cavity formed by the first packing box (6), the hollow shaft (1) and the mounting base plate (2), and the lower part of a compression ring (11) serving as a second packing box is inserted into the first annular cavity and pressed at the top of the first packing group (7); a second packing group (13) is filled in a second annular cavity formed by the pressing ring (11) and the hollow shaft (1), and the lower part of the pressing cover (14) is inserted into the second annular cavity and presses the top of the second packing group (13); the mounting base plate (2), the first packing box (6), the pressing ring (11) and the pressing cover (14) are fixedly connected in pairs in sequence. The invention solves the problems of concentric installation and abrasion of the filler and the rotating shaft.

Description

Double-packing sealing shaft
Technical Field
The invention belongs to the technical field of bearings, and particularly relates to a double-packing sealing shaft capable of solving the problems of installation concentricity of packing and a rotating shaft and abrasion of the packing to the rotating shaft.
Background
The seal can be in various forms, such as mechanical seal, packing seal, oil seal, etc. Each seal has its advantages and disadvantages. The main reason for the leakage of the packing seal is that the packing is not concentric with the rotating shaft, and the packing and the rotating shaft generate a gap at different positions in the rotating process of the rotating shaft to cause leakage. The reason that the filler is not concentric with the rotating shaft is that the machining precision and the installation precision of the rotating shaft and the filler box are usually caused, and particularly the concentric error of the filler box and a main shaft of the rotating shaft is inevitably generated in large-scale equipment.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a double-packing sealing shaft which can solve the problems of concentric installation of packing and a rotating shaft and abrasion of the packing to the rotating shaft.
The invention aims to solve the problems by the following technical scheme:
a double-packing seal shaft comprises a hollow shaft, wherein a mounting bottom plate is arranged at the bottom of the hollow shaft, a first packing box sleeved outside the hollow shaft is arranged on the mounting bottom plate, a first packing group is filled in a first annular cavity formed among the inner wall of the first packing box, the outer wall of the hollow shaft and the bottom surface of a mounting groove of the mounting bottom plate, and the lower part of a compression ring serving as a second packing box is inserted into the first annular cavity and pressed at the top of the first packing group; a second packing group is filled in a second ring cavity formed between the inner wall of the upper part of the compression ring and the outer wall of the hollow shaft, and the lower part of the gland is inserted into the second ring cavity and pressed at the top of the second packing group; the installation bottom plate and the skirt edge of the first packing box, the skirt edge of the first packing box and the skirt edge of the compression ring, and the skirt edge of the compression ring and the skirt edge of the gland are fixedly connected through corresponding double-headed bolts and nuts respectively.
The bottom of the first stuffing box is inserted into the mounting groove of the mounting base plate, and a radial distance of 3-5mm is formed between the outer wall surface of the bottom of the first stuffing box and the inner wall surface of the mounting groove of the mounting base plate.
A first floating ring positioned at the bottom of the first packing group is arranged in the first ring cavity, and radial gaps are reserved between the outer wall of the first floating ring and the inner wall of the first packing box and between the inner wall of the first floating ring and the outer wall of the hollow shaft.
And a PTFE (polytetrafluoroethylene) sealing ring is filled in a space formed by the sunken part at the lower part of the outer wall of the first floating ring, the inner wall of the first stuffing box and the bottom surface of the mounting groove of the mounting bottom plate, and an axial gap is reserved between the bottom of the first floating ring and the bottom surface of the mounting groove of the mounting bottom plate by the PTFE sealing ring.
A first O-shaped sealing ring embedded into the bottom of the first stuffing box and/or the bottom surface of the mounting groove of the mounting bottom plate is arranged between the bottom of the first stuffing box and the bottom surface of the mounting groove of the mounting bottom plate; and a second O-shaped sealing ring embedded into the inner wall of the first stuffing box and/or the lower outer wall of the compression ring is arranged between the lower outer wall of the compression ring inserted into the first ring cavity and the corresponding inner wall of the first stuffing box.
The inner wall of the middle lower part of the compression ring sleeved outside the hollow shaft is in contact connection with the outer wall of the hollow shaft, and a Gray ring embedded into the inner wall of the compression ring is arranged in the contact connection area of the inner wall of the middle lower part of the compression ring and the outer wall of the hollow shaft.
And a second floating ring positioned at the bottom of the second packing set is arranged in the second ring cavity, and radial gaps are also reserved between the outer wall of the second floating ring and the inner wall of the pressure ring and between the inner wall of the first floating ring and the outer wall of the hollow shaft.
The radial distance of the radial gap is 2-3 mm.
An O-shaped sealing ring embedded into the upper inner wall of the pressing ring and/or the lower outer wall of the pressing cover is arranged between the lower outer wall of the pressing cover inserted into the second ring cavity and the upper inner wall of the pressing ring.
The lower parts of the multiple groups of stud bolts are in threaded connection with the skirt edge of the first stuffing box, and the upper parts of the stud bolts penetrate through the skirt edge of the compression ring and are sleeved with the spring groups and then fixed by nuts; the lower parts of the multiple groups of stud bolts are in threaded connection with the skirt edges of the compression rings, and the upper parts of the stud bolts penetrate through the skirt edges of the pressing covers and are fixed by nuts after the spring groups are sleeved.
The spring group adopts a belleville spring.
The skirt edge of the first stuffing box partially extends upwards and the top end of the extending part forms a clamping groove, and the skirt edge of the pressing ring partially extends outwards along the radial direction to form an anti-rotation column embedded clamping groove so as to prevent the first stuffing box and the pressing ring from rotating relatively.
Compared with the prior art, the invention has the following advantages:
according to the double-packing sealing shaft, the hollow shaft is additionally arranged between the packing and the rotating shaft, and the problem of abrasion of the packing on the rotating shaft is solved by using the replaceable hollow shaft; the two-stage packing is adopted to solve the problem of concentric installation of the packing box and the rotating shaft.
The double-packing sealing shaft of the invention leads the packing box to be concentric with the main shaft of the rotating shaft by the rotating shaft so as to ensure that the packing and the GREEN ring are concentric with the main shaft of the rotating shaft, and avoid the phenomenon that the main shaft of the rotating shaft and the packing box are not concentric and the main shaft of the rotating shaft and the packing generate a gap during rotation to cause leakage.
The double-packing sealing shaft adopts a multi-sealing mode to ensure the sealing effect, and the first floating ring plays a role in first-stage blocking sealing to block large-particle materials from entering the first packing box; the first floating ring can press the packing in the first packing group when the sealing cavity is pressurized.
The GREEN adopted by the double-packing sealing shaft can bear the pressure below 40 kilograms, and the sealing of the GREEN can stably run for a long time under the condition that the compression ring serving as the second packing box is concentric with the main shaft of the rotating shaft.
The anti-rotation column of the double-packing sealing shaft can prevent the pressure ring from rotating along with the rotation; and the spring group adopting the belleville spring ensures the pre-tightening pressure of the fillers in the first filler group and the second filler group.
Drawings
FIG. 1 is a schematic perspective view of a dual packing seal shaft according to the present invention;
FIG. 2 is a schematic top view of the dual packing seal shaft of the present invention;
FIG. 3 is a schematic view of the cross-sectional structure A-A of FIG. 2.
Wherein: 1-hollow shaft; 2, mounting a bottom plate; 3-a first O-ring seal; 4-PTFE sealing ring; 5 — a first floating ring; 6-first stuffing box; 7 — a first packing set; 8-second O-ring seal; 9-Gla circle; 10-anti-rotation column; 11-a pressure ring; 12 — a second floating ring; 13 — a second packing set; 14, pressing a cover; 15-spring group; 16-stud bolts; 17-a screw cap; 18-radial clearance; 19-card slot.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1-3: a double-packing seal shaft comprises a hollow shaft 1, wherein a mounting base plate 2 is arranged at the bottom of the hollow shaft 1, a first packing box 6 sleeved outside the hollow shaft 1 is arranged on the mounting base plate 2, a first packing group 7 is filled in a first annular cavity formed among the inner wall of the first packing box 6, the outer wall of the hollow shaft 1 and the bottom surface of a mounting groove of the mounting base plate 2, and the lower part of a compression ring 11 serving as a second packing box is inserted into the first annular cavity and is pressed at the top of the first packing group 7; a second packing group 13 is filled in a second annular cavity formed between the inner wall of the upper part of the compression ring 11 and the outer wall of the hollow shaft 1, and the lower part of the gland 14 is inserted into the second annular cavity and pressed on the top of the second packing group 13; the installation bottom plate 2 and the skirt edge of the first stuffing box 6, the skirt edge of the first stuffing box 6 and the skirt edge of the pressing ring 11, the skirt edge of the pressing ring 11 and the skirt edge of the pressing cover 14 are fixedly connected by adopting a plurality of corresponding groups of stud bolts 16 and nuts 17 respectively, wherein the lower parts of the plurality of groups of stud bolts 16 are in threaded connection with the skirt edge of the first stuffing box 6, the upper parts of the stud bolts 16 penetrate through the skirt edge of the pressing ring 11 and are sleeved with the spring group 15 and then are fixed by adopting the nuts 17, the lower parts of the plurality of groups of stud bolts 16 are in threaded connection with the skirt edge of the pressing ring 11, the upper parts of the stud bolts 16 penetrate through the skirt edge of the pressing cover 14 and are sleeved with the spring group 15 and then are fixed by adopting the nuts 17, the spring group 15 adopts belleville springs.
The bottom of the first stuffing box 6 is inserted into the mounting groove of the mounting base plate 2, and a radial distance of 3-5mm is formed between the outer wall surface of the bottom of the first stuffing box 6 and the inner wall surface of the mounting groove of the mounting base plate 2. When the packing box is installed, the first packing box 6 is enabled to have a space for radial movement, the first packing box 6 and a pressing ring 11 serving as a second packing box are enabled to be concentric with a main shaft of a rotating shaft, and then the installation bottom plate 2 is moved and fixedly connected by adopting a plurality of corresponding groups of stud bolts 16 and nuts 17; therefore, the first packing group 7, the Glae ring 9 and the second packing group 13 for sealing can be concentric with the main shaft of the rotating shaft and the hollow shaft 1, and the sealing effect is ensured.
In order to enable the hollow shaft 1 to have a certain adjustment amount in the radial direction and the axial direction, a first floating ring 5 positioned at the bottom of a first packing group 7 is arranged in a first ring cavity, and radial gaps 18 are reserved between the outer wall of the first floating ring 5 and the inner wall of a first packing box 6 and between the inner wall of the first floating ring 5 and the outer wall of the hollow shaft 1; simultaneously, a space formed by a sunken part at the lower part of the outer wall of the first floating ring 5, the inner wall of the first stuffing box 6 and the bottom surface of the mounting groove of the mounting bottom plate 2 is filled with a PTFE (polytetrafluoroethylene) sealing ring 4, and the PTFE sealing ring 4 enables an axial gap to be reserved between the bottom of the first floating ring 5 and the bottom surface of the mounting groove of the mounting bottom plate 2; a second floating ring 12 positioned at the bottom of the second packing set 13 is arranged in the second ring cavity, and radial gaps 18 are also reserved between the outer wall of the second floating ring 12 and the inner wall of the pressure ring 11 and between the inner wall of the first floating ring 5 and the outer wall of the hollow shaft 1; the radial spacing of the radial gaps 18 is 2-3 mm.
In order to improve the sealing performance of the contact part of each component, a first O-shaped sealing ring 3 embedded into the bottom of the first stuffing box 6 and/or the bottom surface of the mounting groove of the mounting bottom plate 2 is arranged between the bottom of the first stuffing box 6 and the bottom surface of the mounting groove of the mounting bottom plate 2; a second O-shaped sealing ring 8 embedded in the inner wall of the first stuffing box 6 and/or the lower outer wall of the pressing ring 11 is arranged between the lower outer wall of the pressing ring 11 inserted into the first ring cavity and the corresponding inner wall of the first stuffing box 6; the inner wall of the middle lower part of the compression ring 11 sleeved outside the hollow shaft 1 is in contact connection with the outer wall of the hollow shaft 1, and a Gray ring 9 embedded in the inner wall of the compression ring 11 is arranged in the contact connection area of the inner wall of the middle lower part of the compression ring 11 and the outer wall of the hollow shaft 1; an O-shaped sealing ring embedded in the upper inner wall of the pressing ring 11 and/or the lower outer wall of the pressing cover 14 is arranged between the lower outer wall of the pressing cover 14 inserted into the second ring cavity and the upper inner wall of the pressing ring 11; an O-shaped sealing ring embedded in the upper inner wall of the pressing ring 11 and/or the outer wall of the second floating ring 12 is arranged between the outer wall of the second floating ring 12 and the inner wall of the pressing ring 11.
In addition, in order to prevent the relative rotation of the first stuffing box 6 and the compression ring 11, the skirt edge of the first stuffing box 6 partially extends upwards, a clamping groove 19 is formed at the top end of the extending part, and the skirt edge of the compression ring 11 partially extends outwards along the radial direction to form an anti-rotation column 10 to be embedded into the clamping groove 19; the anti-rotation posts 10 may also be secured with corresponding bolts.
According to the double-packing sealing shaft, the hollow shaft 1 is additionally arranged between the packing and the rotating shaft, and the problem of abrasion of the packing on the rotating shaft is solved by using the replaceable hollow shaft 1; the two-stage packing is adopted to solve the problem of concentric installation of the packing box and the rotating shaft.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.

Claims (12)

1. A kind of double packing seals the axle, characterized by: the double-packing sealing shaft comprises a hollow shaft (1), wherein a mounting base plate (2) is arranged at the bottom of the hollow shaft (1), a first packing box (6) sleeved outside the hollow shaft (1) is arranged on the mounting base plate (2), a first packing group (7) is filled in a first annular cavity formed between the inner wall of the first packing box (6), the outer wall of the hollow shaft (1) and the bottom surface of a mounting groove of the mounting base plate (2), and the lower part of a compression ring (11) serving as a second packing box is inserted into the first annular cavity and pressed at the top of the first packing group (7); a second packing group (13) is filled in a second annular cavity formed between the inner wall of the upper part of the compression ring (11) and the outer wall of the hollow shaft (1), and the lower part of the gland (14) is inserted into the second annular cavity and is pressed at the top of the second packing group (13); the installation bottom plate (2) and the skirt edge of the first packing box (6), the skirt edge of the pressing ring (11) and the skirt edge of the pressing cover (14) are fixedly connected through corresponding stud bolts (16) and nuts (17) respectively.
2. The dual packing seal shaft of claim 1, wherein: the bottom of the first stuffing box (6) is inserted into the mounting groove of the mounting base plate (2), and a radial distance of 3-5mm is formed between the outer wall surface of the bottom of the first stuffing box (6) and the inner wall surface of the mounting groove of the mounting base plate (2).
3. The dual packing seal shaft of claim 1, wherein: a first floating ring (5) positioned at the bottom of the first packing group (7) is arranged in the first ring cavity, and radial gaps (18) are reserved between the outer wall of the first floating ring (5) and the inner wall of the first packing box (6) and between the inner wall of the first floating ring (5) and the outer wall of the hollow shaft (1).
4. The dual packing seal shaft of claim 3, wherein: the PTFE sealing ring (4) is filled in a space formed by a sunken part at the lower part of the outer wall of the first floating ring (5), the inner wall of the first stuffing box (6) and the bottom surface of the mounting groove of the mounting base plate (2), and the PTFE sealing ring (4) enables an axial gap to be reserved between the bottom of the first floating ring (5) and the bottom surface of the mounting groove of the mounting base plate (2).
5. The dual packing seal shaft of claim 1, wherein: a first O-shaped sealing ring (3) embedded into the bottom of the first stuffing box (6) and/or the bottom surface of the mounting groove of the mounting bottom plate (2) is arranged between the bottom of the first stuffing box (6) and the bottom surface of the mounting groove of the mounting bottom plate (2); and a second O-shaped sealing ring (8) embedded in the inner wall of the first stuffing box (6) and/or the lower outer wall of the pressing ring (11) is arranged between the lower outer wall of the pressing ring (11) inserted into the first ring cavity and the corresponding inner wall of the first stuffing box (6).
6. The dual packing seal shaft of claim 1, wherein: the inner wall of the middle lower part of the pressing ring (11) sleeved on the outer side of the hollow shaft (1) is in contact connection with the outer wall of the hollow shaft (1), and a Glare ring (9) embedded into the inner wall of the pressing ring (11) is arranged in the contact connection area of the inner wall of the middle lower part of the pressing ring (11) and the outer wall of the hollow shaft (1).
7. The dual packing seal shaft of claim 1, wherein: and a second floating ring (12) positioned at the bottom of the second packing set (13) is arranged in the second ring cavity, and a radial gap (18) is also reserved between the outer wall of the second floating ring (12) and the inner wall of the pressing ring (11) and between the inner wall of the first floating ring (5) and the outer wall of the hollow shaft (1).
8. The dual packing seal shaft of claim 3 or 7, wherein: the radial distance of the radial gap (18) is 2-3 mm.
9. The dual packing seal shaft of claim 1 or 7, wherein: an O-shaped sealing ring embedded in the upper inner wall of the pressing ring (11) and/or the lower outer wall of the pressing cover (14) is arranged between the lower outer wall of the pressing cover (14) inserted into the second ring cavity and the upper inner wall of the pressing ring (11).
10. The dual packing seal shaft of claim 1, wherein: the lower parts of a plurality of groups of stud bolts (16) are in threaded connection with the skirt edge of the first stuffing box (6), and the upper parts of the stud bolts (16) penetrate through the skirt edge of the pressing ring (11) and are fixed by nuts (17) after being sleeved with the spring groups (15); the lower parts of a plurality of groups of stud bolts (16) are in threaded connection with the skirt edge of the pressing ring (11), and the upper parts of the stud bolts (16) penetrate through the skirt edge of the pressing cover (14) and are fixed by nuts (17) after being sleeved with the spring group (15).
11. The dual packing seal shaft of claim 10, wherein: the spring group (15) adopts a belleville spring.
12. The dual packing seal shaft of claim 1, wherein: the skirt edge of the first stuffing box (6) partially extends upwards, a clamping groove (19) is formed at the top end of the extending part, and the skirt edge of the pressing ring (11) partially extends outwards along the radial direction to form an anti-rotation column (10) embedded into the clamping groove (19) so as to prevent the first stuffing box (6) and the pressing ring (11) from rotating relatively.
CN202010726871.7A 2020-07-26 2020-07-26 Double-packing sealing shaft Pending CN111878582A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010726871.7A CN111878582A (en) 2020-07-26 2020-07-26 Double-packing sealing shaft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010726871.7A CN111878582A (en) 2020-07-26 2020-07-26 Double-packing sealing shaft

Publications (1)

Publication Number Publication Date
CN111878582A true CN111878582A (en) 2020-11-03

Family

ID=73202063

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010726871.7A Pending CN111878582A (en) 2020-07-26 2020-07-26 Double-packing sealing shaft

Country Status (1)

Country Link
CN (1) CN111878582A (en)

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