CA2032642A1 - Shaft seal for slurry pumps (2) - Google Patents
Shaft seal for slurry pumps (2)Info
- Publication number
- CA2032642A1 CA2032642A1 CA 2032642 CA2032642A CA2032642A1 CA 2032642 A1 CA2032642 A1 CA 2032642A1 CA 2032642 CA2032642 CA 2032642 CA 2032642 A CA2032642 A CA 2032642A CA 2032642 A1 CA2032642 A1 CA 2032642A1
- Authority
- CA
- Canada
- Prior art keywords
- seal
- covering
- seal cover
- shaft
- fluid
- 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.)
- Abandoned
Links
Abstract
ABSTRACT OF THE DISCLOSURE
A shaft seal for slurry pumps is provided, wherein a seal cover for protecting a rotary seal ring from the outside is provided on its outside with an expeller adapted to prevent accumulation of slurries contained in a fluid confined in a certain sealing space and a covering part of the seal cover, which faces the space and is thus exposed to the fluid, is made of a high-hardness material to improve the resistance of the seal cover to wearing.
A shaft seal for slurry pumps is provided, wherein a seal cover for protecting a rotary seal ring from the outside is provided on its outside with an expeller adapted to prevent accumulation of slurries contained in a fluid confined in a certain sealing space and a covering part of the seal cover, which faces the space and is thus exposed to the fluid, is made of a high-hardness material to improve the resistance of the seal cover to wearing.
Description
Z032fi~
Field of the Invention The present invention is concerned with an improvement in or relating to a slurry seal designed to seal up a fluid containing much slurry.
Prior Art Heretofore, a slurry pump used for pumping up muddy water or the like has been provided as a shaft sealiny means with such a slurry seal as illustrated in Figure 3.
More specifically, the illustrated slurry seal is designed such that a stationary seal ring 103 fixed through a packing 102 over a flange 101 located on the side of a pump casing and a rotary seal ring 108 held through a packing 10~ over a seal cover 106 fixed to an end of a sleeve 105 mounted over a shaft 104 are brought into closely sliding contact with each other on their axially opposite sliding surfaces 103a and 108a, thereby preventing leakage of a fluid sealed up in a certain sealing space S leading to the impeller side, not illu.ctrated, from around the ~haft.
The flange 1 is provided with a quenching hole 109 communicating with the side of the packing 102 attached over the stationary seal ring 103, which is opposite to the space S. Between the inner faces of both seal rings 103 and 108 -2032fi~, and the outer face ot the sleeve 105 mounted over the shaft 104, there is a baffle sleeve 110 fixed at one end to the inner end of the flange 101 and having the other end terminating at a position located in the rear of the rotary seal ring 10B. Quenching water, supplied through the quenching hole 10~ to the side 113 of the packing 102 which is opposite to the space S, flows through a gap 111 between the baffle sleeve 110 and both rings 103 and 108 toward the seal cover 106, whence it is discharged into the atmosphere A through a gap 112 between the baffle sleeve 110 and the sleeve 105.
A problem with the above-mentioned conventional slurry seal, however, is that as slurries of earth and sand, coal dust, etc., contained in large quantities in the fluid confined in the space S, stagnate and accumulate near the sliding surfaces 103a and 108a located at the deepest position of a pump chamber (or the space S), premature erosion or corrosion of said sliding surfaces 103a and 108a and the packings 102 and 107 takes place.
In view of the foregoing, the present invention ~eeks to improve the wear resistance of a slurry seal.
SUMMARY OF THE INVENTION
According to a first aspect of this invention, there is provided a shaft seal for slurry pumps including a stationary seal ring fitted through a packing, which also serves as a spring means, over a flange located on the side 203~fi~
~f a casing and a rotary seal ring fitted through a packing, which also serves as a spring means, over a seal cover fixed to a sleeve of a shaft, said seal rings being in closely sliding contact with each other on their axially opposite sliding surfaces, wherein:
said seal cover is provided on its outside with an expeller adapted to cause a fluid in contact with said outside to be moved away from said sliding surfaces, as it rotates.
According to a second aspect of this invention, there is provided a modification of the above-mentioned shaft seal for slurry pumps, wherein said seal cover is divided into a first covering exposed to a space, in which said fluid is confined, and a second covering fitted on the inside of said first covering, said first covering being made of a high-hardness material having a Rockwell hardness HRC of at least 40.
With the above-mentioned arrangement, the slurries contained in the fluid are unlikely to stagnate and accumulate near the sliding surfaces of both the seal rings, because the expeller provided on the outside of the seal cover rotatable with the shaft produces an axial-flow pumping action to cause them to be constantly and forcedly moved away from ~aid sliding surface~. The seal cover is then divided into the two coverings, a first covering facing a space and a second covering fitted on the inside of said 20326~
first covering, only the first one of which i~ made of a high-hardness material having a HRC of at least 40, thereby improving the resistance of the seal cover itself to wearing by the slurries. Moreover, no considerable difficulty will be encountered in processing the seal cover, since only the first covering is made of the high-hardness material.
BRILF D~SCRIPTION OF TH~ DRAWINGS
The present invention will now be explained specifically but not exclusively with reference to the accompanying drawings, in which: -Figure 1 is a partly sectioned view of oneembodiment of the slurry seal according to this invention, Figure 2 is a front view of part of that embodiment, and Figure 3 is a partly sectioned view of a conventional structure.
D~TAILED EXPLANATION OF THE EMBODIM~NT
. The present invention will now be explained in greater detail with reference to its one embodiment.
Referring fir~t to Figure 1, a flange 1 is fixedly placed in a pump casing (not shown), a shaft 2 is inserted through the flange 1 to rotate an impeller which, although not shown, is attached to the right end of the apparatus according to this invention, and a sleeve 3 is hermetically inserted over the shaft 2 by means of a set screw 4.
The slurry seal is provided between the flange 1 and .~
2032fi~:~
the shaft 2 to prevent leakage of a slurry-containing fluid from a space s confined within the pump casing along the shaft 2 to the atmosphere A, and includes a stationary seal ring 5 made of silicon carbide (SiC) having an increased wear resistance and a rotary seal ring 6 again made of silicon carbide, which comes into sliding contact in axial opposition direction with said seal ring 5, defining sliding surfaces 5a and 6a.
The flange 1 is provided on a part of its inside facing the space S with an annular step ~, on which the stationary seal ring 5 is resiliently supported from the outside through an elastomer packing 8. A seal cover 9 is hermetically fitted over, and bolted at 10 to, a collar-like end 3a, located within the apparatus, of the sleeve 3 attached over the shaft 2. This seal cover 9 is provided at its end axially opposite to the flange 1 with an annular step 11 corresponding to the aforesaid annular step 7. The rotary seal ring 6 is engaged with this annular step 11 through a packing 12 similar to the packing 8, and is resiliently supported thereon from the outside.
Metallic retainers 13 and 14 are fitted over the re~pective rear ends (opposite to the sliding surfaces 5a and 6a) of both rings 5 and 6, and are peripherally engaged with pins ~not shown) axially extending through the flange 1 and seal cover 9, respectively, thereby keeping the stationary seal ring 5 stationary and transmitting a Z03264~
rotational force from the shaft 2 to the rotary seal ring 6 to rotate it.
The packings 8 and 12 serve to maintain airtightness between the flange 1 and the stationary seal ring 5 and between the seal cover 9 and the rotary seal ring 6 and, at the same time, serve as spring means for bringing both seal rings 5 and 6 into pressure contact with each other due to their elasticity, thereby applying the pressure required for sealing-up to the sliding surfaces 5a and 6a.
It is noted that reference numeral 15 stands for a quenching hole formed through the flange 1, and 16 a baffle sleeve for providing a flow passage for guiding quenching water from the quenching hole 15 into spaces definèd within the seal rings 5 and 6.
According to this embodiment, the seal cover 9 is divided into a covering 1~ facing the space S, which assumes a substantially T-shaped form in cross-section when cut by a plane perpendicular to the axial direction and a covering 18 facing the shaft 2, which engages within a recess l~a in the front surface of the covering 17 and assumes a sub~tantially L-shaped form in cross section when cut by a plane perpendicular to the a~ial direction. The above-mentioned annular step 11, which engages and holds the packing 12, is defined by the lower face of the front end of the covering 1~ and the front end face of the covering 18.
The bolt 10 for tightening and fixing this seal 203~
cover 9 in place passes from inside the covering 18 through its both inner collar 18a and an inner collar 17b of the covering 17, and is threadedly engaged with the collar-like end 3a of the sleeve 3. The bolt 10 has then its head lOa embedded in a hole 18b face-lathed in the front face of the inner collar 18a of the covering 17.
Of both the coverings 17 and 18 forming the seal cover g, the covering 17 comes in contact with the slurry-containing fluid and, is made, for instance, of a high-hardness material having a Rockwell hardness ~RC of at least such as high-chromium steel or tungsten carbide. As illustrated in Figure 2, the covering 1~ is provided on its outside with an expeller 20 including a plurality of groove-like recesses 19 provided axially in equal intervals inclining at a suitable angle ~ with the sliding surfaces 5a and 6a or the rotational direction X.
In use, as the seal cover 9 (the covering 1~ on : space S) rotates with the shaft 2 in the direction X, its expeller 20 produces an axial-flow pumping action to cause the fluid in contact with it to be constantly and forcedly moved away from the sliding surfaces 5a and 6a of both the seal rings 5 and 6 or in the direction shown at Y in Figure 2, so that the slurries in the fluid are unlikely to stagnate and build up in the vicinity of the sliding surfaces 5a and 6a. Thus, The wearing of parts of the outer faces of both the seal rings 8 and 12 exposed directly to 20~;~fi~X
che space S and the packings 8 and 12 can be reduced to a minimum.
Since the covering 17 itself of the seal cover 9 is made of a high-hard material, its wear resistance to slurries is also improved, making the expeller 20 rotating at an increased peripheral speed hard to wear. However, no considerable difficulty will be encountered in processing the seal cover 9, because only a part of the seal cover 9 is made of a high-hardness material.
With the slurry seal according to this invention as described above, wherein the seal cover rotating with the shaft is provided on its outside with the expeller producing an axial-flow pumping action to leave the slurries in the fluid out of contact with~the vicinities of the sliding surfaces of the seal rings, it is possible to reduce the wearing of the seal rings and the associated packings to a minimum. Such an effect can be maintained over an extended period, because the seal cover is formed by two coverings, the outer one in contact with the fluid being made of a high-hardness material to prevent erosion of its expeller.
The foregoing is a description of a preferred embodiment of the invention which is given here by way of example only. The invention iS not to be taken as limited to any of the specific features as described, but comprehends all such variations thereof as come within the scope of the appended claims.
Field of the Invention The present invention is concerned with an improvement in or relating to a slurry seal designed to seal up a fluid containing much slurry.
Prior Art Heretofore, a slurry pump used for pumping up muddy water or the like has been provided as a shaft sealiny means with such a slurry seal as illustrated in Figure 3.
More specifically, the illustrated slurry seal is designed such that a stationary seal ring 103 fixed through a packing 102 over a flange 101 located on the side of a pump casing and a rotary seal ring 108 held through a packing 10~ over a seal cover 106 fixed to an end of a sleeve 105 mounted over a shaft 104 are brought into closely sliding contact with each other on their axially opposite sliding surfaces 103a and 108a, thereby preventing leakage of a fluid sealed up in a certain sealing space S leading to the impeller side, not illu.ctrated, from around the ~haft.
The flange 1 is provided with a quenching hole 109 communicating with the side of the packing 102 attached over the stationary seal ring 103, which is opposite to the space S. Between the inner faces of both seal rings 103 and 108 -2032fi~, and the outer face ot the sleeve 105 mounted over the shaft 104, there is a baffle sleeve 110 fixed at one end to the inner end of the flange 101 and having the other end terminating at a position located in the rear of the rotary seal ring 10B. Quenching water, supplied through the quenching hole 10~ to the side 113 of the packing 102 which is opposite to the space S, flows through a gap 111 between the baffle sleeve 110 and both rings 103 and 108 toward the seal cover 106, whence it is discharged into the atmosphere A through a gap 112 between the baffle sleeve 110 and the sleeve 105.
A problem with the above-mentioned conventional slurry seal, however, is that as slurries of earth and sand, coal dust, etc., contained in large quantities in the fluid confined in the space S, stagnate and accumulate near the sliding surfaces 103a and 108a located at the deepest position of a pump chamber (or the space S), premature erosion or corrosion of said sliding surfaces 103a and 108a and the packings 102 and 107 takes place.
In view of the foregoing, the present invention ~eeks to improve the wear resistance of a slurry seal.
SUMMARY OF THE INVENTION
According to a first aspect of this invention, there is provided a shaft seal for slurry pumps including a stationary seal ring fitted through a packing, which also serves as a spring means, over a flange located on the side 203~fi~
~f a casing and a rotary seal ring fitted through a packing, which also serves as a spring means, over a seal cover fixed to a sleeve of a shaft, said seal rings being in closely sliding contact with each other on their axially opposite sliding surfaces, wherein:
said seal cover is provided on its outside with an expeller adapted to cause a fluid in contact with said outside to be moved away from said sliding surfaces, as it rotates.
According to a second aspect of this invention, there is provided a modification of the above-mentioned shaft seal for slurry pumps, wherein said seal cover is divided into a first covering exposed to a space, in which said fluid is confined, and a second covering fitted on the inside of said first covering, said first covering being made of a high-hardness material having a Rockwell hardness HRC of at least 40.
With the above-mentioned arrangement, the slurries contained in the fluid are unlikely to stagnate and accumulate near the sliding surfaces of both the seal rings, because the expeller provided on the outside of the seal cover rotatable with the shaft produces an axial-flow pumping action to cause them to be constantly and forcedly moved away from ~aid sliding surface~. The seal cover is then divided into the two coverings, a first covering facing a space and a second covering fitted on the inside of said 20326~
first covering, only the first one of which i~ made of a high-hardness material having a HRC of at least 40, thereby improving the resistance of the seal cover itself to wearing by the slurries. Moreover, no considerable difficulty will be encountered in processing the seal cover, since only the first covering is made of the high-hardness material.
BRILF D~SCRIPTION OF TH~ DRAWINGS
The present invention will now be explained specifically but not exclusively with reference to the accompanying drawings, in which: -Figure 1 is a partly sectioned view of oneembodiment of the slurry seal according to this invention, Figure 2 is a front view of part of that embodiment, and Figure 3 is a partly sectioned view of a conventional structure.
D~TAILED EXPLANATION OF THE EMBODIM~NT
. The present invention will now be explained in greater detail with reference to its one embodiment.
Referring fir~t to Figure 1, a flange 1 is fixedly placed in a pump casing (not shown), a shaft 2 is inserted through the flange 1 to rotate an impeller which, although not shown, is attached to the right end of the apparatus according to this invention, and a sleeve 3 is hermetically inserted over the shaft 2 by means of a set screw 4.
The slurry seal is provided between the flange 1 and .~
2032fi~:~
the shaft 2 to prevent leakage of a slurry-containing fluid from a space s confined within the pump casing along the shaft 2 to the atmosphere A, and includes a stationary seal ring 5 made of silicon carbide (SiC) having an increased wear resistance and a rotary seal ring 6 again made of silicon carbide, which comes into sliding contact in axial opposition direction with said seal ring 5, defining sliding surfaces 5a and 6a.
The flange 1 is provided on a part of its inside facing the space S with an annular step ~, on which the stationary seal ring 5 is resiliently supported from the outside through an elastomer packing 8. A seal cover 9 is hermetically fitted over, and bolted at 10 to, a collar-like end 3a, located within the apparatus, of the sleeve 3 attached over the shaft 2. This seal cover 9 is provided at its end axially opposite to the flange 1 with an annular step 11 corresponding to the aforesaid annular step 7. The rotary seal ring 6 is engaged with this annular step 11 through a packing 12 similar to the packing 8, and is resiliently supported thereon from the outside.
Metallic retainers 13 and 14 are fitted over the re~pective rear ends (opposite to the sliding surfaces 5a and 6a) of both rings 5 and 6, and are peripherally engaged with pins ~not shown) axially extending through the flange 1 and seal cover 9, respectively, thereby keeping the stationary seal ring 5 stationary and transmitting a Z03264~
rotational force from the shaft 2 to the rotary seal ring 6 to rotate it.
The packings 8 and 12 serve to maintain airtightness between the flange 1 and the stationary seal ring 5 and between the seal cover 9 and the rotary seal ring 6 and, at the same time, serve as spring means for bringing both seal rings 5 and 6 into pressure contact with each other due to their elasticity, thereby applying the pressure required for sealing-up to the sliding surfaces 5a and 6a.
It is noted that reference numeral 15 stands for a quenching hole formed through the flange 1, and 16 a baffle sleeve for providing a flow passage for guiding quenching water from the quenching hole 15 into spaces definèd within the seal rings 5 and 6.
According to this embodiment, the seal cover 9 is divided into a covering 1~ facing the space S, which assumes a substantially T-shaped form in cross-section when cut by a plane perpendicular to the axial direction and a covering 18 facing the shaft 2, which engages within a recess l~a in the front surface of the covering 17 and assumes a sub~tantially L-shaped form in cross section when cut by a plane perpendicular to the a~ial direction. The above-mentioned annular step 11, which engages and holds the packing 12, is defined by the lower face of the front end of the covering 1~ and the front end face of the covering 18.
The bolt 10 for tightening and fixing this seal 203~
cover 9 in place passes from inside the covering 18 through its both inner collar 18a and an inner collar 17b of the covering 17, and is threadedly engaged with the collar-like end 3a of the sleeve 3. The bolt 10 has then its head lOa embedded in a hole 18b face-lathed in the front face of the inner collar 18a of the covering 17.
Of both the coverings 17 and 18 forming the seal cover g, the covering 17 comes in contact with the slurry-containing fluid and, is made, for instance, of a high-hardness material having a Rockwell hardness ~RC of at least such as high-chromium steel or tungsten carbide. As illustrated in Figure 2, the covering 1~ is provided on its outside with an expeller 20 including a plurality of groove-like recesses 19 provided axially in equal intervals inclining at a suitable angle ~ with the sliding surfaces 5a and 6a or the rotational direction X.
In use, as the seal cover 9 (the covering 1~ on : space S) rotates with the shaft 2 in the direction X, its expeller 20 produces an axial-flow pumping action to cause the fluid in contact with it to be constantly and forcedly moved away from the sliding surfaces 5a and 6a of both the seal rings 5 and 6 or in the direction shown at Y in Figure 2, so that the slurries in the fluid are unlikely to stagnate and build up in the vicinity of the sliding surfaces 5a and 6a. Thus, The wearing of parts of the outer faces of both the seal rings 8 and 12 exposed directly to 20~;~fi~X
che space S and the packings 8 and 12 can be reduced to a minimum.
Since the covering 17 itself of the seal cover 9 is made of a high-hard material, its wear resistance to slurries is also improved, making the expeller 20 rotating at an increased peripheral speed hard to wear. However, no considerable difficulty will be encountered in processing the seal cover 9, because only a part of the seal cover 9 is made of a high-hardness material.
With the slurry seal according to this invention as described above, wherein the seal cover rotating with the shaft is provided on its outside with the expeller producing an axial-flow pumping action to leave the slurries in the fluid out of contact with~the vicinities of the sliding surfaces of the seal rings, it is possible to reduce the wearing of the seal rings and the associated packings to a minimum. Such an effect can be maintained over an extended period, because the seal cover is formed by two coverings, the outer one in contact with the fluid being made of a high-hardness material to prevent erosion of its expeller.
The foregoing is a description of a preferred embodiment of the invention which is given here by way of example only. The invention iS not to be taken as limited to any of the specific features as described, but comprehends all such variations thereof as come within the scope of the appended claims.
Claims (2)
1. A shaft seal for slurry pumps including a stationary seal ring fitted through a packing, which also serves as a spring means, over a flange located on the side of a casing and a rotary seal ring fitted through a packing, which also serves as a spring means, over a seal cover fixed to a sleeve of a shaft, said seal rings being in a closely sliding contact with each other on their axially opposite sliding surfaces, wherein:
said seal cover is provided on its outside with an expeller adapted to cause a fluid in contact with said outside to be moved away from said sliding surfaces, as it rotates.
said seal cover is provided on its outside with an expeller adapted to cause a fluid in contact with said outside to be moved away from said sliding surfaces, as it rotates.
2. A shaft seal for slurry pumps as claimed in Claim 1, wherein said seal cover is divided into a first covering exposed to a space, in which said fluid is confined, and a second covering fitted on the inside of said first covering, said first covering being made of a high-hardness material having a Rockwell hardness HRC of at least 40.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14957889U JPH0388064U (en) | 1989-12-26 | 1989-12-26 | |
| JP149578/1989 | 1989-12-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2032642A1 true CA2032642A1 (en) | 1991-06-27 |
Family
ID=15478262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2032642 Abandoned CA2032642A1 (en) | 1989-12-26 | 1990-12-19 | Shaft seal for slurry pumps (2) |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0388064U (en) |
| CA (1) | CA2032642A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109563932A (en) * | 2016-10-17 | 2019-04-02 | Nok株式会社 | Sealing device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006023717A (en) * | 2004-06-07 | 2006-01-26 | Konica Minolta Medical & Graphic Inc | Image forming process and thermal development device |
| JP4565327B2 (en) * | 2004-11-17 | 2010-10-20 | ノーリツ鋼機株式会社 | Coating equipment |
| CN112460012A (en) * | 2020-12-10 | 2021-03-09 | 金川集团股份有限公司 | Drilling BW-850 type slurry pump pull rod sealing device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6014358B2 (en) * | 1976-01-14 | 1985-04-12 | ヤマハ株式会社 | electronic musical instruments |
| JPS5816462B2 (en) * | 1976-03-02 | 1983-03-31 | 株式会社日立国際電気 | Leak detection device using ultrasonic irradiation on transparent bottle enclosure |
| JPS5551168A (en) * | 1978-10-06 | 1980-04-14 | Komatsu Ltd | Preparation of seal ring in floating seal |
-
1989
- 1989-12-26 JP JP14957889U patent/JPH0388064U/ja active Pending
-
1990
- 1990-12-19 CA CA 2032642 patent/CA2032642A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109563932A (en) * | 2016-10-17 | 2019-04-02 | Nok株式会社 | Sealing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0388064U (en) | 1991-09-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |