CA1139331A - Sealing arrangement for centrifugal pumps, particularly for cooling water pumps in motor vehicles - Google Patents
Sealing arrangement for centrifugal pumps, particularly for cooling water pumps in motor vehiclesInfo
- Publication number
- CA1139331A CA1139331A CA000362021A CA362021A CA1139331A CA 1139331 A CA1139331 A CA 1139331A CA 000362021 A CA000362021 A CA 000362021A CA 362021 A CA362021 A CA 362021A CA 1139331 A CA1139331 A CA 1139331A
- Authority
- CA
- Canada
- Prior art keywords
- ring
- filter
- filter ring
- pump
- sealing surface
- 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
Classifications
-
- 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
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
- F16J15/3424—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with microcavities
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
-
- 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
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
Abstract
ABSTRACT OF THE DISCLOSURE
A centrifugal pump seal includes a stationary sliding ring urged by a spring against a counter ring.
The sliding ring has a filter ring housed therein radially outside of its flat sealing surface. The ring is waterproof and porous to trap grains while enabling water to pass therethrough and lubricate the sealing surface.
A centrifugal pump seal includes a stationary sliding ring urged by a spring against a counter ring.
The sliding ring has a filter ring housed therein radially outside of its flat sealing surface. The ring is waterproof and porous to trap grains while enabling water to pass therethrough and lubricate the sealing surface.
Description
il3~
SEALING ARRANGEMENT FOR CENTRIFUGAL PUMPS, PARlTCULARLY FOR COOLING WATER PUMPS IN MOTOR VEHICLES
The invention relates to a sealing arrangement for centrifugal pumps, particularlv for cooling water pumps in motor vehicles, with a check ring arranged fixedly on the pump shaft and with a slip ring seal arrangement pressed into the pump housing, which comprises a sleeve, a bellows seal, a helicoidal spring and a slip ring which is pressed by the spring into sliding abutment against the check ring.
Sealing arrangements for centrifugal pumps of the type initially defined are already known in a variety of constructions.
A sealing arrangement for centrifugal pumps is 15 known from German Offenlegungsschrift 2,850,394 published May 31, 1979, in the name of Garlock Inc., e.g., in Figure 1, wherein the check ring and the slip ring seal arrangement are combined into a subassembly in order to facilitate the assembly.
However, this widespread form of a sealing arrangement for centrifugal pumps, particularly for cooling water pumps in motor vehicles, exhibits, as is further explained in the said German Offenlegungsschrift
SEALING ARRANGEMENT FOR CENTRIFUGAL PUMPS, PARlTCULARLY FOR COOLING WATER PUMPS IN MOTOR VEHICLES
The invention relates to a sealing arrangement for centrifugal pumps, particularlv for cooling water pumps in motor vehicles, with a check ring arranged fixedly on the pump shaft and with a slip ring seal arrangement pressed into the pump housing, which comprises a sleeve, a bellows seal, a helicoidal spring and a slip ring which is pressed by the spring into sliding abutment against the check ring.
Sealing arrangements for centrifugal pumps of the type initially defined are already known in a variety of constructions.
A sealing arrangement for centrifugal pumps is 15 known from German Offenlegungsschrift 2,850,394 published May 31, 1979, in the name of Garlock Inc., e.g., in Figure 1, wherein the check ring and the slip ring seal arrangement are combined into a subassembly in order to facilitate the assembly.
However, this widespread form of a sealing arrangement for centrifugal pumps, particularly for cooling water pumps in motor vehicles, exhibits, as is further explained in the said German Offenlegungsschrift
2,850,394, the disadvantage that grains of sand etc., enter between the planar sliding seal surfaces on the check ring and on the slip ring and cause abrasive wear there. Such grains of sand occur in the cooling system of internal combustion engines as residues of the casting cores required for casting the components of the internal combustion engine.
According to the said German Offenlegungsschrift 2,850,394, it is proposed, in order to obviate this disadvantage, to use, instead of the sealing arrangement heretofore customary for centrifugal 35 pumps, a novel seal ring arrangement constructed after the fashion of a radial shaft seal ring, wherein, on the main sealing lip, one or more auxiliary sealing lips are arranged axially inwards from the actual sealing lip, which have the function to keep abrasive particles, such i,~, ,s 113~
as grains of sand, present in the liquid away from the actual sealing lip.
However, the construction of German Offenlegungsschrift 2,850,394 may exhibit the 5 disadvantage that the abrasive particles settling on the auxiliary sealing lips gradually lead to a wear of the auxiliary sealing lips, and therefore sooner or later abrasive particles may reach the main sealing lip and damage it. Moreover, the auxiliary sealing lip also 10 allows no liquid to pass, so that the main sealing lip may be subject to wear by dry running.
Another sealing arrangement for centrifugal pumps is known from German Offenlegungsschrift 2,623,583 published December 15, 1977, in the name of Goetzewerke 15 Friedrich Goetz A.G., wherein the check ring and the slip ring seal arrangement are likewise combined into a subassembly in order to facilitate the assembly.
In this case the seal housing of said subassembly also encloses the check ring in such a way 20 that abrasive particles such as sand grains which are present in the liquid can only reach the planar sliding seal surfaces between the check ring and the slip ring by passing through a plurality of narrow annular gaps.
Although this arrangement largely prevents the 25 access of coarse abrasive particles, correspondingly small particles can gradually overcome the narrow annular gaps and still reach the plane sliding seal surfaces and cause wear to them.
The aim of the present invention is to improve 30 a sealing arrangement for centrifugal pumps, particularly for cooling water pumps for motor vehicles, so that the disadvantages of known seal arrangements referred to are avoided.
This aim is achieved according to the present 35 invention by providing a seal construction for centrifugal pumps that includes a check ring arranged fixedly on the pump shaft and a slip ring seal construction pressed into the pump housing. The seal construction comprises a sleeve, a bellows seal, a 11393;~
helicoidal spring and a slip ring which is pressed by the spring into sliding abutment with the check ring. The slip ring is provided with a planar slip sealing surface and, radiallv outwardly of that surface, a filter ring made of waterproof but porous water permeable material which abuts elastically against the check ring. In one embodiment, the filter ring consists of felt. In another embodiment, the filter ring consists of porous plastics material. In still another embodiment, the filter ring consists of porous ceramic material.
Due to the fact that the slip ring is provided radially outside its planar sliding seal surface with a filter ring made of waterproof but water permeable material which abuts the check ring elastically, the following essential effect is achieved. Because the filter ring exhibits a comparatively large cross-section and is water permeable, no pressure differential builds up on the auxiliary sealing surface. Therefore, the penetration of liquid and particles into the auxiliary sealing surface is minimized and the leakage volume which is desirable for lubricating the sliding seal surface does not flow through the contact gap on the check ring, but through the total cross-section of the filter ring, whereby abrasive particles contained in the liquid enter 25 the porous material of the filter ring elsewhere than at the contact gap with the check ring and are retained there. It is however thereby ensured that a large number of abrasive particles can no longer enter the region of the contact gap with the check ring, because they are retained in the filter ring. From this it follows that the filter ring wears less in the region of the contact gap with the check ring than the auxiliary sealing lips previously known, because here in contradistinction to the auxiliary sealing lips, where particles initially 35 retained may pass back into the contact gap at a subsequent time. The particles once retained in the filter ring are eliminated from the circuit.
, ~ ~
113~3~
The invention is explained more fully with reference to an exemplary embodiment illustrated in the accompanying drawing, wherein:
Figure 1 shows a vertical section through a 5 unique sealing arrangement on a conventional cooling water pump of a motor vehicle; and Figure 2 shows a section on a larger scale through the check ring and the slip ring with the filter ring according to the invention.
The cooling water pump of a motor vehicle illustrated in Figure 1 substantially comprises a pump housing 1, in which a pump shaft 3 is mounted rotatably via a shaft bearing 2. Mounted fixedly on the inner end of the pump shaft 3 is a pump rotor 4, on the 15 outward-pointing hub of which a check ring 5 is mounted fixedly. A slip ring seal assembly 6, which comprises a sleeve 7, a bellows seal 8, a helicoidal spring 9, a bracing ring 10 and a slip ring 11, is pressed into a bore of the pump housing 1.
Insofar as heretofore described, the sealing arrangement of the cooling water pump is of conventional construction.
As may be seen from Figure 2, the slip ring 11 is provided radially outside its planar sliding seal surface 13 with a filter ring 12 made of waterproof but porous water permeable material, which abuts elastically against the check ring 5.
The filter ring 12 here may consist of various suitable materials such as felt, porous plastics material or porous ceramics material.
Because abrasive particles, such as grains of sand etc., which reach the filter ring 12, are caught and retained in the compara~ively large filter cross-section of the filter ring 12, only a much smaller proportion of abrasive particles can enter the contact gap with the check ring 5 and can consequently also cause only a small degree of wear there. The porosity of the filter ring 12 also permits, in addition to the trapping of abrasive li3~;~3i particles, a desirable lubrication of the plane sliding seal surface 13.
Obviously, the embodiment illustrated in the drawing represents only one possible construction, a plurality of radially consecutively arranged filter rings, optionally with porosity of different fineness, is also conceivable according to the individual application.
s~
,. .;~
According to the said German Offenlegungsschrift 2,850,394, it is proposed, in order to obviate this disadvantage, to use, instead of the sealing arrangement heretofore customary for centrifugal 35 pumps, a novel seal ring arrangement constructed after the fashion of a radial shaft seal ring, wherein, on the main sealing lip, one or more auxiliary sealing lips are arranged axially inwards from the actual sealing lip, which have the function to keep abrasive particles, such i,~, ,s 113~
as grains of sand, present in the liquid away from the actual sealing lip.
However, the construction of German Offenlegungsschrift 2,850,394 may exhibit the 5 disadvantage that the abrasive particles settling on the auxiliary sealing lips gradually lead to a wear of the auxiliary sealing lips, and therefore sooner or later abrasive particles may reach the main sealing lip and damage it. Moreover, the auxiliary sealing lip also 10 allows no liquid to pass, so that the main sealing lip may be subject to wear by dry running.
Another sealing arrangement for centrifugal pumps is known from German Offenlegungsschrift 2,623,583 published December 15, 1977, in the name of Goetzewerke 15 Friedrich Goetz A.G., wherein the check ring and the slip ring seal arrangement are likewise combined into a subassembly in order to facilitate the assembly.
In this case the seal housing of said subassembly also encloses the check ring in such a way 20 that abrasive particles such as sand grains which are present in the liquid can only reach the planar sliding seal surfaces between the check ring and the slip ring by passing through a plurality of narrow annular gaps.
Although this arrangement largely prevents the 25 access of coarse abrasive particles, correspondingly small particles can gradually overcome the narrow annular gaps and still reach the plane sliding seal surfaces and cause wear to them.
The aim of the present invention is to improve 30 a sealing arrangement for centrifugal pumps, particularly for cooling water pumps for motor vehicles, so that the disadvantages of known seal arrangements referred to are avoided.
This aim is achieved according to the present 35 invention by providing a seal construction for centrifugal pumps that includes a check ring arranged fixedly on the pump shaft and a slip ring seal construction pressed into the pump housing. The seal construction comprises a sleeve, a bellows seal, a 11393;~
helicoidal spring and a slip ring which is pressed by the spring into sliding abutment with the check ring. The slip ring is provided with a planar slip sealing surface and, radiallv outwardly of that surface, a filter ring made of waterproof but porous water permeable material which abuts elastically against the check ring. In one embodiment, the filter ring consists of felt. In another embodiment, the filter ring consists of porous plastics material. In still another embodiment, the filter ring consists of porous ceramic material.
Due to the fact that the slip ring is provided radially outside its planar sliding seal surface with a filter ring made of waterproof but water permeable material which abuts the check ring elastically, the following essential effect is achieved. Because the filter ring exhibits a comparatively large cross-section and is water permeable, no pressure differential builds up on the auxiliary sealing surface. Therefore, the penetration of liquid and particles into the auxiliary sealing surface is minimized and the leakage volume which is desirable for lubricating the sliding seal surface does not flow through the contact gap on the check ring, but through the total cross-section of the filter ring, whereby abrasive particles contained in the liquid enter 25 the porous material of the filter ring elsewhere than at the contact gap with the check ring and are retained there. It is however thereby ensured that a large number of abrasive particles can no longer enter the region of the contact gap with the check ring, because they are retained in the filter ring. From this it follows that the filter ring wears less in the region of the contact gap with the check ring than the auxiliary sealing lips previously known, because here in contradistinction to the auxiliary sealing lips, where particles initially 35 retained may pass back into the contact gap at a subsequent time. The particles once retained in the filter ring are eliminated from the circuit.
, ~ ~
113~3~
The invention is explained more fully with reference to an exemplary embodiment illustrated in the accompanying drawing, wherein:
Figure 1 shows a vertical section through a 5 unique sealing arrangement on a conventional cooling water pump of a motor vehicle; and Figure 2 shows a section on a larger scale through the check ring and the slip ring with the filter ring according to the invention.
The cooling water pump of a motor vehicle illustrated in Figure 1 substantially comprises a pump housing 1, in which a pump shaft 3 is mounted rotatably via a shaft bearing 2. Mounted fixedly on the inner end of the pump shaft 3 is a pump rotor 4, on the 15 outward-pointing hub of which a check ring 5 is mounted fixedly. A slip ring seal assembly 6, which comprises a sleeve 7, a bellows seal 8, a helicoidal spring 9, a bracing ring 10 and a slip ring 11, is pressed into a bore of the pump housing 1.
Insofar as heretofore described, the sealing arrangement of the cooling water pump is of conventional construction.
As may be seen from Figure 2, the slip ring 11 is provided radially outside its planar sliding seal surface 13 with a filter ring 12 made of waterproof but porous water permeable material, which abuts elastically against the check ring 5.
The filter ring 12 here may consist of various suitable materials such as felt, porous plastics material or porous ceramics material.
Because abrasive particles, such as grains of sand etc., which reach the filter ring 12, are caught and retained in the compara~ively large filter cross-section of the filter ring 12, only a much smaller proportion of abrasive particles can enter the contact gap with the check ring 5 and can consequently also cause only a small degree of wear there. The porosity of the filter ring 12 also permits, in addition to the trapping of abrasive li3~;~3i particles, a desirable lubrication of the plane sliding seal surface 13.
Obviously, the embodiment illustrated in the drawing represents only one possible construction, a plurality of radially consecutively arranged filter rings, optionally with porosity of different fineness, is also conceivable according to the individual application.
s~
,. .;~
Claims (4)
1. A centrifugal water pump having, in combination, a pump housing, a rotatable pump component and a seal means interposed between said housing and said rotatable pump element;
said seal means including a check ring arranged fixedly on said rotatable pump component and a slip ring seal assembly pressed into said pump housing;
said slip ring assembly comprising a sleeve, a bellows seal, a helicoidal spring, and a slip ring which is pressed by said helicoidal spring into sliding abutment with said check ring;
said slip ring having a planar slip sealing surface in flush engagement with said check ring and a filter ring secured thereto;
said filter ring being spaced radially outwardly of said planar sealing surface and being elastically urged into engagement with said check ring;
said filter ring being constructed of a waterproof, porous, water permeable material whereby water being pumped by said pump may pass through said filter ring to lubricate said planar sealing surface and particles in said water are entrapped in said filter ring so that such particles are unable to contaminate said planar sealing surface.
said seal means including a check ring arranged fixedly on said rotatable pump component and a slip ring seal assembly pressed into said pump housing;
said slip ring assembly comprising a sleeve, a bellows seal, a helicoidal spring, and a slip ring which is pressed by said helicoidal spring into sliding abutment with said check ring;
said slip ring having a planar slip sealing surface in flush engagement with said check ring and a filter ring secured thereto;
said filter ring being spaced radially outwardly of said planar sealing surface and being elastically urged into engagement with said check ring;
said filter ring being constructed of a waterproof, porous, water permeable material whereby water being pumped by said pump may pass through said filter ring to lubricate said planar sealing surface and particles in said water are entrapped in said filter ring so that such particles are unable to contaminate said planar sealing surface.
2. A centrifugal water pump according to claim 1, wherein said filter ring is made of a felt material.
3. A centrifugal water pump according to claim 1, wherein said filter ring is made of a porous plastics material.
4. A centrifugal water pump according to claim 1, wherein said filter ring is made of a porous ceramic material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792940845 DE2940845B1 (en) | 1979-10-09 | 1979-10-09 | Centrifugal pump seal, in particular for cooling water pumps in motor vehicles |
| DEP2940845.5 | 1979-10-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1139331A true CA1139331A (en) | 1983-01-11 |
Family
ID=6083037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000362021A Expired CA1139331A (en) | 1979-10-09 | 1980-10-09 | Sealing arrangement for centrifugal pumps, particularly for cooling water pumps in motor vehicles |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0026823A1 (en) |
| JP (1) | JPS5698597A (en) |
| CA (1) | CA1139331A (en) |
| DE (1) | DE2940845B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10907142B2 (en) | 2007-01-18 | 2021-02-02 | Genzyme Corporation | Oligosaccharides comprising an aminooxy group and conjugates thereof |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU7620287A (en) * | 1986-07-28 | 1988-02-04 | Joseph Reginald Dunford | Filter between centrifugal pump impeller and shaft seals |
| US4872690A (en) * | 1988-09-09 | 1989-10-10 | Enviroseal Engineering Products Ltd. | Seal cavity protector |
| JPH0198368U (en) * | 1987-12-23 | 1989-06-30 | ||
| DE69304159T2 (en) * | 1992-07-21 | 1996-12-19 | Cummins Engine Co Inc | Self-sealing water pump seal |
| JP2962499B2 (en) * | 1992-10-07 | 1999-10-12 | 富士写真フイルム株式会社 | Continuous punch |
| ZA200307530B (en) * | 2002-10-28 | 2004-07-01 | Weir Envirotech Pty Ltd | Liquid flinger for a pump. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1237697A (en) * | 1958-10-29 | 1960-07-29 | Seal for sealing surfaces which mutually perform parallel movements, in particular seal for slip rings | |
| NL103719C (en) * | 1959-06-11 | |||
| FR1435931A (en) * | 1965-03-08 | 1966-04-22 | Side friction seal |
-
1979
- 1979-10-09 DE DE19792940845 patent/DE2940845B1/en not_active Withdrawn
-
1980
- 1980-08-08 EP EP80104684A patent/EP0026823A1/en not_active Withdrawn
- 1980-10-09 CA CA000362021A patent/CA1139331A/en not_active Expired
- 1980-10-09 JP JP14069680A patent/JPS5698597A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10907142B2 (en) | 2007-01-18 | 2021-02-02 | Genzyme Corporation | Oligosaccharides comprising an aminooxy group and conjugates thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0026823A1 (en) | 1981-04-15 |
| DE2940845B1 (en) | 1980-06-26 |
| JPS5698597A (en) | 1981-08-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |