GB2216975A - Ceramic to plastics joint - Google Patents
Ceramic to plastics joint Download PDFInfo
- Publication number
- GB2216975A GB2216975A GB8902800A GB8902800A GB2216975A GB 2216975 A GB2216975 A GB 2216975A GB 8902800 A GB8902800 A GB 8902800A GB 8902800 A GB8902800 A GB 8902800A GB 2216975 A GB2216975 A GB 2216975A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mounting part
- ring
- slide ring
- joint
- fastener
- 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.)
- Granted
Links
- 239000004033 plastic Substances 0.000 title claims abstract description 19
- 229920003023 plastic Polymers 0.000 title claims abstract description 19
- 239000000919 ceramic Substances 0.000 title abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 27
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 15
- 239000007769 metal material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract 1
- 238000012856 packing Methods 0.000 description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
- B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
- B23P11/025—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits by using heat or cold
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B4/00—Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits; Non-releasable friction-grip fastenings
- F16B4/006—Shrinkage connections, e.g. assembled with the parts being at different temperature
-
- 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
- F16J15/3464—Mounting of the seal
- F16J15/3468—Means for controlling the deformations of the contacting faces
-
- 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
- F16J15/36—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
- C04B2237/32—Ceramic
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/76—Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc
- C04B2237/765—Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc at least one member being a tube
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/82—Two substrates not completely covering each other, e.g. two plates in a staggered position
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
- F16B2200/85—Ceramic-to-metal-connections
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
- F16B2200/97—Constructional details of connections not covered for in other groups of this subclass having differing thermal expansion coefficients
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Sealing (AREA)
- Insertion Pins And Rivets (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
Abstract
The invention relates to a joint for fastening a mounting part (12) made of a plastic material to a slide ring (11) made of a ceramic material. The joint comprises a ring fastener (13) made of metal which provides a shrinkage grip on the axial outer surface (15) of the slide ring (11), and on the axial outer contact surface (16) of the mounting part (12) in such a way that the axial wall of the recess formed in the mounting part (12) to receive the slide ring (11) bears closely against the axial outer surface of the slide ring (11) within the area (14) of the bottom end of the space. A fixed ring (11), eg attached to a housing, is engaged by a rotary ring (11), eg attached to a shaft, to provide a ceramic seal against leakage of a fluid. <IMAGE>
Description
k C n n 6975 1 Joint structure for fastening a slide ring to a mounting
part The invention relates to a joint structure for fastening a slide ring to a mounting part, which joint structure comprises a mounting part manufactured of a plastic material and a slide ring of a ceramic material to be fastened to a space formed in the mounting part.
It is very problematic to join ceramic materi- als to plastic materials, because the thermal expansion coefficients of these materials differ considerably from each other. Moreover, the problem is made worse by the fact that the other properties of these materials also differ from each other very much. Both materials have properties placing restrictions on the use of certain joint solutions. As examples can be mentioned that a glueing is hindered by the different thermal expansion coefficients as well as by the bad capacity of certain plastics for being glued, by the difficult machinability of the ceramic material of a threaded joint and by the weak durability of plastic, that welding is not possible, because the melting temperatures of the materials are of quite a different order, etc.
It is necessary to find a usable joint solution in spite of the very different material properties, because these materials can under the same working conditions be successfully used to complement each other. As one example can be mentioned a joint between PTFE and silicon carbide in a slide ring packing. These materials have a good chemical durability, but the wear resistance of PTFE is weak, and on the other hand, it is difficult and expensive to shape silicon carbide, so that it is practically sensible and neces- 1 2 sary to join these materials together in such a way that the joint is pressure-proof. and to some extent, power-transmitting.
Joints between a ceramic material mentioned above and a plastic material have seldom been necessary in practice, because ceramic materials have not been ready for practical applications yet. The recent strong product development of ceramic materials has made it possible to apply them in new f ields and im- proved their usability also otherwise.
Up till now, joints of this type have been carried out f or instance in such a way that a mounting part manufactured of a plastic material has been provided with a groove, in which a slide ring of a cera- mic material has been arranged. This groove has been formed in such a manner that on the inner periphery of the slide ring is formed a linear pressure contact, which packs the joint between the parts.
A drawback of the joining method mentioned above is that both the inner and the outer periphery of the slide ring of a ceramic material must be machined. Because it is a slow and expensive procedure to machine ceramic materials, the costs rise considerably high. It shall be noted in particular that it is difficult to machine the inner periphery. A further drawback is that the ring tends to push out of the groove easily when the temperature rises. It shall additionally be noted that the capacity of momentum transfer according to the above solution is weak, be- cause the friction coefficient between the plastic material and the ceramic material is small.
The object of the invention is to provide a joint structure, by means of which the drawbacks of the prior art can be eliminated. This has been reached by means of a joint structure of the invention, which 1 t 1 3 is characterized by a ring fastener manufactured of a metal material, which ring fastener is by means of a shrinkage joint arranged to bear against the axial outer surface of the slide ring on the one hand, and against the axial contact surface of the mounting part on the other hand, in such a way that the axial wall of the space formed in the mounting part bears closely against the axial outer surface of the slide ring within the area of the bottom end of the space.
The advantage of the invention is above all that the manufacturing costs remain relatively low. This is due to the fact that it is not necessary to machine for instance the inner periphery of the ceramic part at all. Another advantage is that the capaci- ty of momentum transfer af the joint structure according to the invention is notably good compared with the previously known solutions.
The invention will be described in the following by means of the examples shown in the enclosed drawing, in which Figure 1 shows a principle sectional view of a joint between a ceramic slide ring and a mounting part according to the prior art,
Figure 2 shows a principle sectional view of a joint structure according to the invention and Figure 3 shows a principle sectional view of a slide ring packing using the joint structure according to Figure 2.
Figure 1 shows a principle sectional view of an example of a previously known solution for fastening a slide ring to a mounting part, for instance to a packing ring. Figure 1 shows only half of the cross section of the slide ring. It is, however, evident that the structure is in fact similar on both sides of the symmetry axis marked with a broken line in Figure 1.
f 4 In Figure 1, the ceramic slide ring is indicated by the reference numeral 1 and correspondingly, the mounting part manufactured of a plastic material is indicated by the reference numeral 2. A groove 5 is machined in the mounting part 2 f or the slide ring 1 to generate pressure at the point indicated by the reference numeral 3 when the slide ring 1 is pressed in place.
The tightness of the joint presented above is not good, because the area of the tightening surface 3 is very small. In practice, a linear contact is caused between the slide ring 1 and the mounting part 2. No strong pressure is possible on the outer periphery of the slide ring, in the space indicated by the refer- ence numeral 4, because if that were- the case, the slide ring would tend to get off the groove 5 easily.
When carrying out the joint in the above-mentioned manner, it is necessary to machine both the inner and the outer periphery of the ceramic slide ring 1. Because it is a very slow and expensive procedure to machine ceramic materials, the costs rise considerably high. It is especially difficult to machine the inner diameter, and in the solution described above, a good surface shall be machined for the inner peri- phery 6 of the slide ring 1 to provide the tightness needed at the point 3.
A further drawback of the known solution mentioned above is that when the body gets warm, the high thermal expansion coefficient of the plastic material can make the slide ring 1 to push out of the groove 5, because the mounting part 2 expands also in the axial direction.
According to the solution of Figure 1, the capacity of transfer of the momentum M between the slide ring 1 and the mounting part 2 is bad, because 1 5.
there is little holding surface and the plastic materials and the ceramic materials are slippery, i.e. the friction coefficient between the slide ring 1 and the mounting part 2 is low.
Figure 2 shows a principle sectional view of a joint structure according to the invention. Figure 2 is drawn in the same ray as Figure 1, i.e. only half of the structure is drawn to show.
Figure 2 shows a slide ring of a ceramic mate- rial by means of the reference numeral 11. The mounting part again, manufactured of a plastic material, is indicated by the reference numeral 12. The reference numeral 13 designates a ring fastener manufactured of a metal material. It is possible to use a metal mate- rial, because a joint structure can be planned in such a manner that a corrosively agressive material, e.g. a fluid, is situated on the inner diameter side of the slide ring 11 and the mounting part 12.
A joint structure of the invention can be real- ized in the following way. The ceramic slide ring 11 is placed in a space machined in the mounting part 12 manufactured of a plastic material, for instance in a recess, which is especially clearly seen from Figure 2. The ring fastener 13 is fastened by means of a shrinkage joint on the slide ring 11 and the mounting part 12, as shown in Figure 2. The ring fastener 13 is dimensioned in such a way that a suitable pressure is caused between the ring fastener 13 and the axial outer surface of the slide ring 11. This point of pressure is indicated by the reference numeral 15. Moreover, the ring fastener 13 is dimensioned in such a way that the ring fastener bears against the axial contact surface of the mounting part 12 at a point 16, so that the axial wall of the space formed in the mounting part 12 bears closely against the axial outer 6 surface of the slide ring 11 within the area 14 of the bottom end of the space. Consequently, the joint is sealed within the area 14 in such a way that the ring fastener 13 has no contact with a possible corrosively 5 agressive material.
A groove 17 is additionally machined in the ring fastener 13, by virtue of which groove the slide ring 11 and the ring fastener 13 hold fast in the mounting part 12. The operating principle of this groove 17 is clearly seen from Figure 2. The idea of the groove 17 is that soft plastic material extrudes into the groove 17 when the ring fastener 13 is pressed to fasten to the mounting part 12, as shown in the part of Figure 2 describing this detail. In this way, a joint holding in the direction of the arrow N is provided.
The joint according to Figure 2 tightens in use, when the parts warm up a little, f or plastic material expands more than the materials of the other parts when it gets warm. Thus, the pressure at the points 14 and 16 increases and the tightness of the joint improves. At the same time, more plastic material extrudes into the groove 17 and improves the hold of the slide ring and the ring fastener in the mounting part 12. The capacity of transfer of the momentum X is also fully sufficient even in the assembly dimension, because the power can be transmitted from the slide ring 11 and the ring fastener 13 to the mounting part 12 through the point 14 as well as through the point 16. The capacity of momentum transfer gets also better when the mounting part 12 is expanding. The fact that the parts cool to a temperature lower than the assembly temperature does not cause any problems, because the mounting part 12 then-bears against the slide ring 11 more closely than before.
7 Due to correct dimensioning, the mounting part 12 does not, however, get loose f rom the ring fastener 13. It is not a problem to hold the slide ring 11 and the ring fastener 13 fastened to each other, for this can be controlled by means of a normal machine-technical dimensioning.
It is advantageous to effect the joint structure of the invention in practice, because very little machinings need to be done in the ceramic slide ring 11, which is difficult to machine, e.g. the inner pe riphery does not need to be machined at all. The ring fastener 13 shall, naturally, be machined to accurate dimensions, but it is no problem when using modern machine tools, because the part in question is practi- cally very simple. On the other hand, it is easy to machine the mounting part made of a plastic material.
As stated above already, the capacity of momentum transfer of the joint structure of the invention is good. However, the capacity of momentum transfer can still be improved by using e.g. a pin or a wedge between the mounting part 12 and the ring fastener 13.
It is simple in practice to assemble the joint structure of the invention. The ring fastener 13 is warmed up in an oven and the slide ring 11 and the mounting part 12 can be cooled correspondingly e.g. in a freezer, if needed. The ring fastener 13 is mounted in place according to Figure 2 and the temperatures are allowed to become even, whereby the parts 11, 12 and 13 are fastened to each other.
Figure 3 shows one perfect embodiment of the invention in principle, in which slide ring packing the fastening of the slide ring 31 of a packing ring T and the slide ring 32 of a counter ring V is carried out in the way according to the invention. The mount- ing part of the packing ring T is indicated by the 1 8 reference numeral 33 and the mounting part of the counter ring V correspondingly by the reference numeral 34 in the figure. The ring fasteners are indicated in Figure 3 by the reference numerals 37, 38. In the solution of Figure 3, the packing ring T is fastened to a rotating axle 35 and the counter ring V again to a casing 36. The joint structure of the invention shall be very tight at the point 14 (Figure 2), because there is pressurized liquid in the space S. The joint structure shall also transfer the momentum caused when the sliding surfaces of the slide rings 31, 32 slide against each other. The pressure in the space S gets also behind the slide rings, why the locking must be sufficiently strong in the axial di- rection N (Figure 2), e.g. such as described above.
The embodiment above is in no way intended to restrict the invention, but the invention can be varied quite freely within the scope of the claims. So it is clear that the joint structure of the invention or the parts thereof do not necessarily need to be quite as described in the figures, but solutions of other kinds can also be used, etc.
7 T_ 9
Claims (2)
1. A joint structure for fastening a slide ring to a mounting part, which joint structure comprises a mounting part (12, 33, 34) manufactured of a plastic material and a slide ring (11, 31, 32) of a ceramic material to be fastened to a space formed in the mountingpart, characterized byaring fastener (13, 37, 38) manufactured of a metal mate rial, which ring fastener is by means of a shrinkage joint arranged to bear against the axial outer surface (15) of the slide ring (11, 31, 32) on the one hand, and against the axial contact surface (16) of the mounting part (12, 33, 34) on the other hand, in such a way that the axial wall of the space formed in the mounting part (12, 33, 34) bears closely against the axial outer surface of the slide ring (11, 31, 32) within the area (14) of the bottom end of the space.
2. A joint structure according to claim 1, c h a r a c t e r i z e d in that the surface of the ring fastener (13, 37, 38) bearing against the axial contact surface (16) of the mounting part is provided with a groove (17).
Published 1989 atThe Patent Office. State House, 66,171 High Holborn, London WCIR4TP. Further copies maybe obtainedfrom The PatentOfftee. Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent, Con, 1187
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI881341A FI78973C (en) | 1988-03-21 | 1988-03-21 | Connection structure for attaching a sliding ring to a mounting part |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8902800D0 GB8902800D0 (en) | 1989-03-30 |
| GB2216975A true GB2216975A (en) | 1989-10-18 |
| GB2216975B GB2216975B (en) | 1991-12-18 |
Family
ID=8526122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8902800A Expired GB2216975B (en) | 1988-03-21 | 1989-02-08 | Joint structure for fastening a slide ring to a mounting post |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3909100A1 (en) |
| FI (1) | FI78973C (en) |
| GB (1) | GB2216975B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0481236A1 (en) * | 1990-10-16 | 1992-04-22 | Bernd Seibig | Article comprising a metallic element and a ceramic element |
| FR2722843A1 (en) * | 1994-07-19 | 1996-01-26 | Jeumont Industrie | Shaft seal for primary pump in cooling circuit for nuclear plant |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19846153C1 (en) * | 1998-10-07 | 2000-04-20 | Freudenberg Carl Fa | Mechanical seal |
| DE19914929C2 (en) * | 1999-04-01 | 2001-07-19 | Freudenberg Carl Fa | Mechanical seal |
| DE19914930A1 (en) * | 1999-04-01 | 2000-10-19 | Freudenberg Carl Fa | Mechanical seal |
| DE102017204004A1 (en) * | 2016-03-22 | 2017-09-28 | Ksb Aktiengesellschaft | SEAL |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2122041A5 (en) * | 1971-01-15 | 1972-08-25 | Meca Ind Int | |
| GB8412875D0 (en) * | 1984-05-19 | 1984-06-27 | Flexibox Ltd | Mechanical seals |
-
1988
- 1988-03-21 FI FI881341A patent/FI78973C/en not_active IP Right Cessation
-
1989
- 1989-02-08 GB GB8902800A patent/GB2216975B/en not_active Expired
- 1989-03-20 DE DE3909100A patent/DE3909100A1/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0481236A1 (en) * | 1990-10-16 | 1992-04-22 | Bernd Seibig | Article comprising a metallic element and a ceramic element |
| FR2722843A1 (en) * | 1994-07-19 | 1996-01-26 | Jeumont Industrie | Shaft seal for primary pump in cooling circuit for nuclear plant |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2216975B (en) | 1991-12-18 |
| DE3909100A1 (en) | 1989-10-05 |
| FI78973B (en) | 1989-06-30 |
| GB8902800D0 (en) | 1989-03-30 |
| FI881341A0 (en) | 1988-03-21 |
| FI78973C (en) | 1989-10-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960208 |