CA1178307A - Hydrostatic seal - Google Patents
Hydrostatic sealInfo
- Publication number
- CA1178307A CA1178307A CA000398429A CA398429A CA1178307A CA 1178307 A CA1178307 A CA 1178307A CA 000398429 A CA000398429 A CA 000398429A CA 398429 A CA398429 A CA 398429A CA 1178307 A CA1178307 A CA 1178307A
- Authority
- CA
- Canada
- Prior art keywords
- segments
- ring
- seal
- staggered
- layer
- 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.)
- Expired
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
- Sealing Devices (AREA)
Abstract
HYDROSTATIC SEAL
ABSTRACT
The hydrostatic seal is constructed of thirty-two 45 curved segments manufactured from fiberglass reinforced natural rubber;
There are eight segments per ring layer and four ring layers form the seal; the segments are glued together in a staggered arrangement, one staggered segment through the seal being left unglued to provide for field installation of the seal around the pump, the unglued segment being glued in the field.
ABSTRACT
The hydrostatic seal is constructed of thirty-two 45 curved segments manufactured from fiberglass reinforced natural rubber;
There are eight segments per ring layer and four ring layers form the seal; the segments are glued together in a staggered arrangement, one staggered segment through the seal being left unglued to provide for field installation of the seal around the pump, the unglued segment being glued in the field.
Description
~:~7~3307 HYDROSTATIC SEAL
BACKGROUND
In large pump installations there are problems with the chamber flooding, especially where the head water level is higher than the sump floor level. In this type of an installation there is a problem in keeping water from getting into the subfoundation because of inadequate sealing. There are also problems in installing seals to prevent them from getting torn and damaged during the installation procedure. Prior seals tore durin~ assembly because of the high stresses encountered at the flange joints. In order to avoid these problems, the easiest way would be to make a seal in a single piece but this is not practical because of the configurations of the various pumps presenting elbows which are angular and have larger dimensions than the axial opening in the seal. Thus, if a one-piece seal was provided it would have to stretch for mounting purposes over the structure of the pump and this stretching would deform the seal where it would be inoperable to function for sealing purposes. It has also been found that a single-piece,no-seam-seal was not practical for assembling`in the shop on the pump prior to shipment. This is true because when shipping these large pumps, they cannot be containerized so that it is out in the open and the seal, likewise, if assembled to the pump during assembly in the shop, would also be out in the open and thus subject to damage which has been a very high risk. The only practical way to ship seals is to ship them independently of the pump in a crate by themselves.
SUMMARY OF THE INVENTION
In accordance with the preferred embodiment of the present invention, there i5 provided a hydrostatic seal which includes a plurality of layers of circular confirguration, each layer being constructed of sectors and the sectors of each layer overlaping the lower layer.
The hydrostatic seal of the present invention in its preferred form is constructed from a total of thirty-two 45 curved segments manufactured from natural rubber .
~'7~33~7 reinforced with fiberglass. The 45 segment construction is considerably less expensive to manufacture due mainly to the smaller die that can be used and the greater flexibility with tolerances that is associated with the smaller die. Unlike prior rubber diaphragms which were torn during field assembly, the natural rubber fiberglass reinforced seal of the present invention improves the ability of the seal ring to withstand the abuse that is inherent in field assembly.
Using a natural rubber cement, the 45 segments are glued together in a staggered arrangement, until a completely circular ring is formed. This construction is done in assembly in the manufacturing shop wherein each layer is layed out in a circular ray and the next layer of segments is arranged in staggered relation to the lower layer and the two layers glued together. This arrangement is continued for a four-layer thickness ring. For field assembly purposes, one staggered section is not glued until the entire ring is assembled in the field. This allows the seal to be eased into position around the pump assembly and lowered into its assembled position and thereafter the unglued staggered section may be glued together to form a complete hydrostatic no-leak seal.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a view in vertical elevation and partly in section showing the pump installation with the pump mounted in a sump section and showing the hydrostatic seal of the present invention in sealing position;
Fig. 2 is a enlarged fragmentary view showing the relationship of the hydrostatic seal with relationship to the pump and to the foundation;
Fig. 3 is a plan view of the assembly of the sectionalized segments of the hydrostatic seal;
Fig. 4 is the view in vertical section taken in the plane represented by the line IV-IV in Fig. 3, showing the layers separated t~ illustrate the separation that is left between two segments in each layer; and .
83~7' Fig. 5 is a plan view of a single segment of the complete hydrostatic seal shown in Fig. 3.
DESCRIPTION O~ T~IE I~VENTION
As shown in Fig. 1, a vertical column water pump 10 is mounted and secured to the concrete foundation 11 at the pump support plate 61. The pump 10 consists of the motor and motor pedestal 21 which is bolted to the pump support plate 61, an upper pipe column 23, a discharge elbow 60 from which the water exits down a discharge pipe 17, the lower casing section 28, and the pump rotating element consisting of the impeller 29 and the line shaft 33.
The construction of the support structure 12 is such that the water level 16 in the pump intake basin 14 is at an elevation above the lower pump access room floor 36. The lower pump access room 20 is sealed against the high water level 16 by sealing the circular floor opening 27 with the hydrostatic seal 40 of the present invention.
The hydrostatic seal 40 is constructed so as to be flexible as possible while exhibiting excellent sealing characteristics such as to equal one-piece construction.
The seal 40, while providing the above characteristics, also is arranged so as to present a configuration of a single turn or spiral screw thread for assembly around the pump without damage to the seal.
The seal 40 is constructed of a plurality of curved segments, which, for the seal shown, comprises thirty-two 45 curved segments 41. The segments are identical and each is manufactured from natural rubber that is reinforced with fiberglass. The construction of the seal of 45 curved segments is considerably less expensive to manufacture than a two-piece or solid one-piece member. This is true because the die, which must be acurately constructed to close tolerances to form the segments is considerably less expensive to manufacture than a much larger die necessary for two-piece or single-piece construction.
Eight 45 curved segments, having a thickness of ~:1'7~ 7 1/16 of an inch, are arranged in circular array, and glued in abutting relationship to form a single circular layer 46. The joint 51 at one position is left unglued so as to provide easy separation.
As previously mentioned the seal 40 is constructed of four concentric layers with each layer comprised of eight 45~ curved segments 41. As shown in Fig. 4, the layers are identified as 46, 47, 4~ and 49.
As indicated in Fig. 4 one joint between two adjacent segments is left unbonded as indicated at 51, 52, 53 and 54 in each layer. Also the segments in adjacent layers are staggered relative to each other. The preferred staggered arrangement is a 1/3 relationship, as shown in Fig. 4. As shown, the segment 41A associated with the lower layer 46 has a 1/3 end surface 56 which is overlapped by the segment 41I associated with the adjacent layer 47. In like manner the segment 41H associated with the ring layer 46, which will normally be in a position adjacent to the segment 41A and in abutting relationship, is arranged so as to leave 1/3 of the adjacent layer segment 41J bottom surface exposed. The same relationship obtains for the ends 52 of segment 41I associated with ring layer 47 and segment 41R of ring layer 48. The 1/3 staggered relationship is also maintained between adjacent segments associated with the ring layers 48 and 49. Thus, the separation provided permits the hydrostatic seal to be installed around the pump in the field without damaging or stretching the seal as would be the case if the seal was a complete ring. This is true because the elbow portion 60 of the elbow housing 24 extends a substantial distance outwardly from the vertical casing surface.
Installation of the seal is more readily understood from the following explanation. The pump is precision aligned and mounted on the main pump support plate 61 as shown in Fig. 1. After the pump is bolted and secured to the main plate, the sub-floor curb ring 62 is aligned and leveled in relation to the hydrostatic seal ` mounting flange 63 on the pump. As shown in Fig. 2 the 1~7~3~
curb ring 62 is then secured into place with grout and anchor bolts 64. This curb ring, and the hydrostatic seal mounting flange on the pump, provide the outer and inner supports, respectively, for the hydrostatic seal ring 40.
5 As shown in Fig. 3, the seal 40 is manufactured with precisely located stud-receiviny openings 66 and 67 which are arranged in concentric circles. The inner circle of stud opening 66 receives the pump flange studs 68 and the outer stud openings 67 being adapted to receive the curb 10 ring studs 69. After the mounting studs 69 are screwed into the curb ring 62, the plurality of mounting studs 68 are also screwed into the pump flange 63 and, the hydrostatic seal ring 40 is placed over the studs. At the sealable step joint, as shown in Fig. 4, the hydrostatic 15 seal ring is lifted off of the studs, one of the two sealing templates 21 (not shown) is placed over the studs, and the lower half of the sealable step joint is laid over this template (not shown). Natural rubber cement is spread over the bottom section or layer and under the top 20 section of the sealable joint, the top section is laid over the studs and matched with the bottom section, and a second seal template (not shown) is placed over the top section to make a "sandwich". Nuts 71 and 72 are screwed onto the studs associated with the outer ring or curb stud 25 69 and also the studs 68 associated with the inner ring or flange and tightened to compress the seal templates and joint. After the joint is set and dry, the assembled sandwich of bottom template (not shown), hydrostatic seal 40, and upper template (not shown), is lifted and the 30 sealing templates are removed. Final assembly of the seal group is made by placing outer and inner segmented hold down rings 76 and 77 over the hydrostatic seal ring and tightening the nuts 71 and 72 on each stud 68 and 69 of the respective circles. Thus, the seal ring is now one 35 complete ring without any joint. In the previous known seals, the joint or joints were difficult to seal. There were high stresses in the immediate vicinity of the seam and there was leakage at the seam after a period of time.
~ - 6 ~ 83~7 ~ith the present seal, the joint is easily sealed and, after it is dry, is identical to any other section of the ring. This ensures that stresses are equally distributed over the entire ring, versus concentrated at one section, and the possibility of leakage at any one section is diminished.
The unique single joint design reduces the amount of time, labor and expertise required for initial seal installation as well as future replacement of the hydrostatic seal ringO This ensures that a high degree of pump serviceability is maintained.
BACKGROUND
In large pump installations there are problems with the chamber flooding, especially where the head water level is higher than the sump floor level. In this type of an installation there is a problem in keeping water from getting into the subfoundation because of inadequate sealing. There are also problems in installing seals to prevent them from getting torn and damaged during the installation procedure. Prior seals tore durin~ assembly because of the high stresses encountered at the flange joints. In order to avoid these problems, the easiest way would be to make a seal in a single piece but this is not practical because of the configurations of the various pumps presenting elbows which are angular and have larger dimensions than the axial opening in the seal. Thus, if a one-piece seal was provided it would have to stretch for mounting purposes over the structure of the pump and this stretching would deform the seal where it would be inoperable to function for sealing purposes. It has also been found that a single-piece,no-seam-seal was not practical for assembling`in the shop on the pump prior to shipment. This is true because when shipping these large pumps, they cannot be containerized so that it is out in the open and the seal, likewise, if assembled to the pump during assembly in the shop, would also be out in the open and thus subject to damage which has been a very high risk. The only practical way to ship seals is to ship them independently of the pump in a crate by themselves.
SUMMARY OF THE INVENTION
In accordance with the preferred embodiment of the present invention, there i5 provided a hydrostatic seal which includes a plurality of layers of circular confirguration, each layer being constructed of sectors and the sectors of each layer overlaping the lower layer.
The hydrostatic seal of the present invention in its preferred form is constructed from a total of thirty-two 45 curved segments manufactured from natural rubber .
~'7~33~7 reinforced with fiberglass. The 45 segment construction is considerably less expensive to manufacture due mainly to the smaller die that can be used and the greater flexibility with tolerances that is associated with the smaller die. Unlike prior rubber diaphragms which were torn during field assembly, the natural rubber fiberglass reinforced seal of the present invention improves the ability of the seal ring to withstand the abuse that is inherent in field assembly.
Using a natural rubber cement, the 45 segments are glued together in a staggered arrangement, until a completely circular ring is formed. This construction is done in assembly in the manufacturing shop wherein each layer is layed out in a circular ray and the next layer of segments is arranged in staggered relation to the lower layer and the two layers glued together. This arrangement is continued for a four-layer thickness ring. For field assembly purposes, one staggered section is not glued until the entire ring is assembled in the field. This allows the seal to be eased into position around the pump assembly and lowered into its assembled position and thereafter the unglued staggered section may be glued together to form a complete hydrostatic no-leak seal.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a view in vertical elevation and partly in section showing the pump installation with the pump mounted in a sump section and showing the hydrostatic seal of the present invention in sealing position;
Fig. 2 is a enlarged fragmentary view showing the relationship of the hydrostatic seal with relationship to the pump and to the foundation;
Fig. 3 is a plan view of the assembly of the sectionalized segments of the hydrostatic seal;
Fig. 4 is the view in vertical section taken in the plane represented by the line IV-IV in Fig. 3, showing the layers separated t~ illustrate the separation that is left between two segments in each layer; and .
83~7' Fig. 5 is a plan view of a single segment of the complete hydrostatic seal shown in Fig. 3.
DESCRIPTION O~ T~IE I~VENTION
As shown in Fig. 1, a vertical column water pump 10 is mounted and secured to the concrete foundation 11 at the pump support plate 61. The pump 10 consists of the motor and motor pedestal 21 which is bolted to the pump support plate 61, an upper pipe column 23, a discharge elbow 60 from which the water exits down a discharge pipe 17, the lower casing section 28, and the pump rotating element consisting of the impeller 29 and the line shaft 33.
The construction of the support structure 12 is such that the water level 16 in the pump intake basin 14 is at an elevation above the lower pump access room floor 36. The lower pump access room 20 is sealed against the high water level 16 by sealing the circular floor opening 27 with the hydrostatic seal 40 of the present invention.
The hydrostatic seal 40 is constructed so as to be flexible as possible while exhibiting excellent sealing characteristics such as to equal one-piece construction.
The seal 40, while providing the above characteristics, also is arranged so as to present a configuration of a single turn or spiral screw thread for assembly around the pump without damage to the seal.
The seal 40 is constructed of a plurality of curved segments, which, for the seal shown, comprises thirty-two 45 curved segments 41. The segments are identical and each is manufactured from natural rubber that is reinforced with fiberglass. The construction of the seal of 45 curved segments is considerably less expensive to manufacture than a two-piece or solid one-piece member. This is true because the die, which must be acurately constructed to close tolerances to form the segments is considerably less expensive to manufacture than a much larger die necessary for two-piece or single-piece construction.
Eight 45 curved segments, having a thickness of ~:1'7~ 7 1/16 of an inch, are arranged in circular array, and glued in abutting relationship to form a single circular layer 46. The joint 51 at one position is left unglued so as to provide easy separation.
As previously mentioned the seal 40 is constructed of four concentric layers with each layer comprised of eight 45~ curved segments 41. As shown in Fig. 4, the layers are identified as 46, 47, 4~ and 49.
As indicated in Fig. 4 one joint between two adjacent segments is left unbonded as indicated at 51, 52, 53 and 54 in each layer. Also the segments in adjacent layers are staggered relative to each other. The preferred staggered arrangement is a 1/3 relationship, as shown in Fig. 4. As shown, the segment 41A associated with the lower layer 46 has a 1/3 end surface 56 which is overlapped by the segment 41I associated with the adjacent layer 47. In like manner the segment 41H associated with the ring layer 46, which will normally be in a position adjacent to the segment 41A and in abutting relationship, is arranged so as to leave 1/3 of the adjacent layer segment 41J bottom surface exposed. The same relationship obtains for the ends 52 of segment 41I associated with ring layer 47 and segment 41R of ring layer 48. The 1/3 staggered relationship is also maintained between adjacent segments associated with the ring layers 48 and 49. Thus, the separation provided permits the hydrostatic seal to be installed around the pump in the field without damaging or stretching the seal as would be the case if the seal was a complete ring. This is true because the elbow portion 60 of the elbow housing 24 extends a substantial distance outwardly from the vertical casing surface.
Installation of the seal is more readily understood from the following explanation. The pump is precision aligned and mounted on the main pump support plate 61 as shown in Fig. 1. After the pump is bolted and secured to the main plate, the sub-floor curb ring 62 is aligned and leveled in relation to the hydrostatic seal ` mounting flange 63 on the pump. As shown in Fig. 2 the 1~7~3~
curb ring 62 is then secured into place with grout and anchor bolts 64. This curb ring, and the hydrostatic seal mounting flange on the pump, provide the outer and inner supports, respectively, for the hydrostatic seal ring 40.
5 As shown in Fig. 3, the seal 40 is manufactured with precisely located stud-receiviny openings 66 and 67 which are arranged in concentric circles. The inner circle of stud opening 66 receives the pump flange studs 68 and the outer stud openings 67 being adapted to receive the curb 10 ring studs 69. After the mounting studs 69 are screwed into the curb ring 62, the plurality of mounting studs 68 are also screwed into the pump flange 63 and, the hydrostatic seal ring 40 is placed over the studs. At the sealable step joint, as shown in Fig. 4, the hydrostatic 15 seal ring is lifted off of the studs, one of the two sealing templates 21 (not shown) is placed over the studs, and the lower half of the sealable step joint is laid over this template (not shown). Natural rubber cement is spread over the bottom section or layer and under the top 20 section of the sealable joint, the top section is laid over the studs and matched with the bottom section, and a second seal template (not shown) is placed over the top section to make a "sandwich". Nuts 71 and 72 are screwed onto the studs associated with the outer ring or curb stud 25 69 and also the studs 68 associated with the inner ring or flange and tightened to compress the seal templates and joint. After the joint is set and dry, the assembled sandwich of bottom template (not shown), hydrostatic seal 40, and upper template (not shown), is lifted and the 30 sealing templates are removed. Final assembly of the seal group is made by placing outer and inner segmented hold down rings 76 and 77 over the hydrostatic seal ring and tightening the nuts 71 and 72 on each stud 68 and 69 of the respective circles. Thus, the seal ring is now one 35 complete ring without any joint. In the previous known seals, the joint or joints were difficult to seal. There were high stresses in the immediate vicinity of the seam and there was leakage at the seam after a period of time.
~ - 6 ~ 83~7 ~ith the present seal, the joint is easily sealed and, after it is dry, is identical to any other section of the ring. This ensures that stresses are equally distributed over the entire ring, versus concentrated at one section, and the possibility of leakage at any one section is diminished.
The unique single joint design reduces the amount of time, labor and expertise required for initial seal installation as well as future replacement of the hydrostatic seal ringO This ensures that a high degree of pump serviceability is maintained.
Claims (6)
1. In a method of constructing a hydrostatic seal comprising the steps of:
forming a plurality of identical circular segments;
arranging some of said segments so as to form a first closed ring;
arranging others of said segments so as to form a second closed ring;
arranging said second closed ring on said first closed ring in superimposed relationship in a manner that the segments of each ring are staggered relative to each other;
joining said first and second rings by cementing.
forming a plurality of identical circular segments;
arranging some of said segments so as to form a first closed ring;
arranging others of said segments so as to form a second closed ring;
arranging said second closed ring on said first closed ring in superimposed relationship in a manner that the segments of each ring are staggered relative to each other;
joining said first and second rings by cementing.
2. A method of manufacturing a hydrostatic seal according to claim 1 comprising the additional step of:
arranging additional circular segments in circular array to form additional complete rings which are disposed in layered relationship on the other of said rings and having the segments thereof arranged in staggered relationship with respect to the segments of adjacent rings;
joining all rings by cementing to form a unitized seal.
arranging additional circular segments in circular array to form additional complete rings which are disposed in layered relationship on the other of said rings and having the segments thereof arranged in staggered relationship with respect to the segments of adjacent rings;
joining all rings by cementing to form a unitized seal.
3. A method of manufacturing a hydrostatic seal according to a claim 2 wherein the staggered relationship of the segments of adjacent ring layers are overlayed by a superposed segment by 2/3 of the total surface of the superposed segment; and said ring layers are four in number.
4. A method of manufacturing a hydrostatic seal according to claim 3 wherein the cementing of adjacent layers is controlled so as to leave one region of staggered segments uncemented to provide a separation between all ring layers to facilitate field installation of the seal around a pump.
5. In a hydrostatic seal;
a plurality of identical curved segments;
a plurality of circular ring layers formed from said segments, said circular ring layers being superimposed one upon another with each segment of an associated layer staggered with respect to the segments of an adjacent ring layer;
cement means applied to adjacent abuting surfaces of said ring layers and operable to join said ring layers together.
a plurality of identical curved segments;
a plurality of circular ring layers formed from said segments, said circular ring layers being superimposed one upon another with each segment of an associated layer staggered with respect to the segments of an adjacent ring layer;
cement means applied to adjacent abuting surfaces of said ring layers and operable to join said ring layers together.
6. A hydrostatic seal according to claim 5 wherein said plurality of identical curved segments are a total of thirty-two 45° curved segments of a fiberglass reinforced natural rubber; and wherein each layer includes eight (8) of said segments, and each layer being arranged so that its associated segments are staggered, relative to the segments of an adjacent layer; and wherein said cement means is a natural rubber cement.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24559881A | 1981-03-19 | 1981-03-19 | |
| US245,598 | 1981-03-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1178307A true CA1178307A (en) | 1984-11-20 |
Family
ID=22927336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000398429A Expired CA1178307A (en) | 1981-03-19 | 1982-03-16 | Hydrostatic seal |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS57167562A (en) |
| AU (1) | AU8097882A (en) |
| CA (1) | CA1178307A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103406771B (en) * | 2013-07-22 | 2015-05-27 | 芜湖陀曼精机科技有限公司 | Static-pressure sealing structure of lower surface of vertical high-precision working table |
-
1982
- 1982-03-01 AU AU80978/82A patent/AU8097882A/en not_active Abandoned
- 1982-03-15 JP JP4065482A patent/JPS57167562A/en active Pending
- 1982-03-16 CA CA000398429A patent/CA1178307A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57167562A (en) | 1982-10-15 |
| AU8097882A (en) | 1982-09-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3968552A (en) | Method and apparatus for forming plastic lined junction in lined pipe | |
| US5608998A (en) | Panel for lining manholes and the like | |
| US5882043A (en) | Roof drain adapter | |
| US3813107A (en) | Gasket seal between sewer pipe and manhole opening | |
| US20060188339A1 (en) | Inflatable underground structure liner | |
| CA2153473A1 (en) | Sockets serving for the connection of two plastic pipes and process for the production of such a socket | |
| US3640038A (en) | Concrete structures | |
| US4394025A (en) | Pipe compression seal for bell and spigot joint | |
| US4582449A (en) | Manhole sealing device | |
| JPH04363456A (en) | Pitch pocket and formation thereof | |
| CA1178307A (en) | Hydrostatic seal | |
| EP1015703A1 (en) | Sump liner and method of installation | |
| JPH0368240B2 (en) | ||
| JPS6363828A (en) | Water-proof junction for concrete structure | |
| JPH0225036Y2 (en) | ||
| JPH0743317Y2 (en) | Synthetic resin roof drain | |
| US3967322A (en) | Fluid containing structure | |
| JPH025156Y2 (en) | ||
| JPS6139120Y2 (en) | ||
| US8499372B1 (en) | Nozzle mounting assembly | |
| JPH023030Y2 (en) | ||
| JPS5925977Y2 (en) | Joint structure of steel underground structures | |
| US4591067A (en) | Plastic insert for storage vessel | |
| CA1219823A (en) | Plastic insert for storage vessel | |
| JPH03124593A (en) | Panel assembly type water supply tank |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |