CN1272563C - Unit for sealing end surface of 3D helical flute with double helix angles - Google Patents
Unit for sealing end surface of 3D helical flute with double helix angles Download PDFInfo
- Publication number
- CN1272563C CN1272563C CNB021464499A CN02146449A CN1272563C CN 1272563 C CN1272563 C CN 1272563C CN B021464499 A CNB021464499 A CN B021464499A CN 02146449 A CN02146449 A CN 02146449A CN 1272563 C CN1272563 C CN 1272563C
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- Prior art keywords
- spiral
- helix angle
- face
- seal face
- downstream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- 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
- F16J15/3412—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 cavities
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Mechanical Sealing (AREA)
Abstract
The present invention relates to a spiral flute end-face sealing device used for a rotating shaft of fluid machinery. The present invention is characterized in that at least one upper surface of the sealing end face of a rotary ring or a stationary ring is provided with a set of double spiral angle three-dimensional spiral grooves, wherein the spiral angles of spiral lines of a left and a right side walls which form a spiral groove are different; the spiral grooves formed by the side walls have a convergent shape with a wider upper stream, namely a high pressure side, and a narrower down stream, namely a low pressure side; the depth of each of the spiral groove can gradually shoal from the upper stream, namely the high pressure side to the down stream, namely the low pressure side so as to form a three-dimensional convergent spiral groove. The present invention has the advantages that compared with the common two-dimensional spiral flute end-face seal with equal depth and an equal spiral angle, the thickness or the rigidity of fluid films of the present invention is higher, and the reliability of the fluid films of the present invention is higher under the same condition; the present invention is suitable for sealing devices of different rotary fluid machinery, particularly for dry air sealing devices.
Description
Technical field
The invention belongs to the face seals of running shaft, be particularly related to a kind of double helix angle three-dimensional spiral groove face seals, this seal arrangement can be used for the running shaft of fluid machineries such as the compressor, decompressor, seperator, pump, reactor stirrer of various types.
Background technique
The dynamic and static pressure combined type of known fluid spiral groove end sealer, also have deficiency, for example owing to the helix angle of forming spiral fluted helix molded lines in its structure is identical, the spiral chute groove depth equates, so under certain operating mode, fluid film thickness deficiency, perhaps the insufficient rigidity of fluid film under certain fluid film thickness causes the seal arrangement unstable properties.
Summary of the invention
The present invention provides a kind of new double helix angle three-dimensional spiral groove face seals for solving the technical problem that exists in the known technology, it has bigger fluid film thickness under identical operating mode, perhaps have bigger fluid film rigidity under identical fluid film thickness.
The technological scheme that the present invention takes for the technical problem that exists in the solution known technology is:
The present invention is a kind of double helix angle three-dimensional spiral groove face seals, form by the rotating ring that has seal face and the stationary ring that has seal face and other correlated parts, the seal face of this stationary ring and the seal face of rotating ring fit, two faying surfaces are the seal face of ring, one side of seal face is that the high pressure side is the upstream, the opposite side of seal face is that low voltage side is the downstream, the seal face rotation of the relative stationary ring of seal face of rotating ring, it is characterized in that: one group of double helix angle three-dimensional spiral groove is set at least one of described rotating ring seal face and stationary ring seal face, wherein, constitute the helix angle difference of the helix of two sidewalls about a spiral fluted, it is that the high pressure side is wideer that the spiral chute of being made up of them has the upstream, the downstream is the narrower convergence profile of low voltage side; And each spiral fluted degree of depth is from upstream to that the downstream shoals gradually or is invariable, thereby forms a kind of convergent contour spiral chute of three-dimensional; Under given rotation direction the spiral chute group with fluid-encapsulated be that the high pressure side is the low voltage side pumping downstream from the upstream; Also have a plane endless belt of not slotting promptly to seal the dam in the spiral fluted downstream.
The present invention can adopt following technical measures to realize:
The molded lines of spiral chute sidewall is accurate on the described seal face, or approximate log spiral is equiangular helical spiral, and wherein the side channel wall of windward side is the major trough wall, and the side channel wall of lee face is secondary cell wall.
The scope of the helix angle of described spiral chute sidewall molded lines is 5 °-20 °.
The scope of the helix angle of described spiral chute sidewall major trough wall molded lines is 10 °-20 °, and the helix angle scope of secondary cell wall molded lines is 5 °-15 °, and the helix angle of major trough wall molded lines is greater than the helix angle of secondary cell wall molded lines.
Described spiral chute sidewall molded lines is a log spiral, or is similar to the circular arc line of log spiral, and the center of circle of this circular arc line is eccentric with respect to the center of circle of ring packing end face.
The described spiral fluted degree of depth is constant, and depth bounds is 0.002～0.2mm.
The described spiral fluted degree of depth radially changes, from the upstream be the high pressure side be downstream low voltage side gradually from depth to shallow, its scope is 0～0.2mm.
The optimum range of described spiral chute upstream groove depth is 0.005～0.012mm, and the scope of downstream groove depth is 0～0.007mm, and the upstream groove depth is greater than the downstream groove depth.
Advantage and good effect that the present invention has are:
Two-dimensional helical groove face seals dark with grade, equal helix angle is compared, the convergent contour spiral fluted groove depth of being made up of the helix of two different helix angles also can be to be from upstream to the downstream to shoal gradually in the present invention, grooved is three-dimensional fully, has stronger convergence property, compression that can be stronger to fluid-encapsulated generation, so bigger fluid film thickness is arranged between the seal face under the same conditions, perhaps under identical fluid film thickness, has bigger fluid film rigidity.In the present invention, have a plane endless belt promptly to seal the dam in the spiral fluted downstream, it plays throttling action under rotary state, under static state then play the parking seal action.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention one;
Fig. 2 is the structural representation of the embodiment of the invention two;
Fig. 3 is the molded lines schematic representation of spiral chute 11 among Fig. 1;
Fig. 4 is the floor map of spiral chute 11 among Fig. 1;
Fig. 5 is the enlarged diagram of the spiral chute 11 among Fig. 4;
Fig. 6 is the structural representation of the embodiment of the invention three;
Fig. 7 is the structural representation of the embodiment of the invention four;
Fig. 8 is the floor map of spiral chute 16 among Fig. 6;
Fig. 9 is the enlarged diagram of the spiral chute 16 among Fig. 8.
Fig. 1 among the embodiment one, Fig. 3, each label implication of Fig. 4, Fig. 5 are as follows:
R
0The inside radius of the seal face of fitting mutually between-rotating ring and the stationary ring
R
1-spiral fluted inside radius
R
2-spiral fluted outer radius
R
3The outer radius of the seal face of fitting mutually between-rotating ring and the stationary ring
R
b-equilibrium radius
The h-spiral chute degree of depth
H-high pressure side, i.e. upstream
L-low voltage side, i.e. downstream
G-spiral chute pump draws direction
The alpha-helix angle
The R-radius
AB, A " B "-curve
A ' B '-straight line
P, the P " point of contact of curve and circle
The point of contact of P '-straight line and circle
C-when spiral chute is on the rotating ring end face, the rotation direction of rotating ring
D-when spiral chute is on the stationary ring end face, the rotation direction of rotating ring
M-major trough wall molded lines
The secondary cell wall molded lines of N-
The secondary cell wall molded lines of E-single-screw angle spiral chute
α
1-short major trough wall M molded lines helix angle
α
2-long secondary cell wall N molded lines helix angle
α
eThe secondary cell wall E of-single-screw angle spiral fluted molded lines helix angle
S
1-spiral chute normal direction width
S
2The normal direction width on the weir of unslotted between-two spiral chutes
h
1-downstream groove depth
h
2-upstream groove depth
Fig. 6 among the embodiment three, Fig. 8, each label implication of Fig. 9 are as follows:
R
4The outer radius of the seal face of fitting mutually between-rotating ring and the stationary ring
R
5-spiral fluted outer radius
R
6-spiral fluted inside radius
R
7-rotate badly and the inside radius of the seal face of fitting mutually between the stationary ring
R
b'-equilibrium radius
H '-spiral chute the degree of depth
H '-high pressure side, i.e. upstream
L '-low voltage side, i.e. downstream
G '-spiral chute pump draws direction
C '-when spiral chute is on the rotating ring end face, the rotation direction of rotating ring
M '-major trough wall molded lines
N '-secondary cell wall molded lines
The secondary cell wall molded lines of E '-single-screw angle spiral chute
α
1'-short major trough wall M ' molded lines helix angle
α
2'-long secondary cell wall N ' molded lines helix angle
α
eThe secondary cell wall E ' of '-single-screw angle spiral fluted molded lines helix angle
S
1'-spiral chute normal direction width
S
2The normal direction width on the weir of unslotted between '-two spiral chutes
h
1'-downstream groove depth
h
2'-upstream groove depth
Spiral fluted radius R shown in Fig. 1, Fig. 2, Fig. 6 and Fig. 7
1, R
2, R
5, R
6, their essence implications in specification of the present invention are meant spiral fluted maximum or least radius.The position that sectional view dissects when dissecing can not be spiral fluted maximum radius place or least radius place, and still, so schematic mark can make the reader pass through these accompanying drawings can faster understanding to the present invention.
In addition, in accompanying drawing of the present invention, a spiral chute is made up of three cell walls, still, in fact spiral chute be by about two side channel walls root cell wall of being connected these two sidewalls with one constitute, the molded lines of this root cell wall is actually the one section circular arc line concentric with spin axis.The actual molded lines that refers to those two side channel walls of mentioned in this manual spiral chute molded lines is seen the M among Fig. 4, Fig. 5, Fig. 8 and Fig. 9, N, M ', N '.
Embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, enumerate following examples now, and conjunction with figs. is described in detail as follows:
Embodiment one: see also Fig. 1, Fig. 3, Fig. 4 and Fig. 5.
Fig. 1 is arranged on the sectional view of the double helix angle three-dimensional spiral groove face seals on the rotating ring for spiral chute.The sealing device comprises rotating ring 1, stationary ring 2, stop pin 3, secondary seal ring 4, throw-out collar 5, spring 6, housing 7, axle sleeve 8, axle 9, static seal circle 10.
The seal face of the seal face of rotating ring 1 and stationary ring 2 is fitted mutually, and the former can rotate with respect to the latter, and the faying surface of the two is seal face.In this embodiment, the outside of seal face is upstream H for the high pressure side, and the inboard of seal face is the downstream for low voltage side.Spiral chute 11 is set on the seal face of rotating ring 1.Under given rotation direction, spiral chute is with fluid-encapsulated direction pumping downstream from the upstream along arrow G.In addition, at inboard plane endless belt 12, the i.e. R in addition of spiral fluted
0With R
1Between endless belt, play throttling and parking sealer, can be referred to as to seal the dam.
Fig. 3 is the spiral flute type line chart.Spiral chute has two side channel walls, and its molded lines can be that accurate or approximate log spiral is an equiangular helical spiral.Wherein helix angle is defined as follows: establish the smoothed curve of any pattern from the A point of the less inside radius of radius (or A ', A " point) beginning; till the B point of the bigger outer radius of radius (or B ', B " point), the concentric circle at any radius R place between the inside and outside radius and this curve intersection promptly are defined as helix angle in P point (or P ', P " point) at the tangent line of this point curve and the angle α between the concentrically ringed tangent line.Curve A B is opposite with the helix angle direction of curve A " B ", if definition the former for just, then the latter is for bearing.In the present invention, the scope of helix angle be 0 °＜| α |＜90 °, its optimum range is 5 °-20 °.
Fig. 4 represents spiral fluted shape and position on the seal face, and wherein, the outside of seal face is upstream H for the high pressure side, and the inboard of seal face is downstream L for low voltage side.Also have a plane endless belt promptly to seal dam 12 in the inboard of spiral chute 11, be in R
1With R
0Between.If spiral chute processing is on rotating ring the time, the sense of rotation of this ring be C to; If spiral chute processing is on stationary ring the time, the sense of rotation of the rotating ring relative with it be D to.
Among the present invention, the molded lines of forming two side channel walls of spiral fluted has different helix angles, and the helix angle of short major trough wall M molded lines is α
1, the helix angle of long secondary cell wall N molded lines is α
2, | α
2|＞| α
2|; Here, major trough wall and secondary cell wall are to distinguish like this: under given rotation direction, the wall that facings the wind is the major trough wall, and leeward wall is secondary cell wall.Pitch angle alpha will owing to two sidewalls about a spiral fluted
1And α
2Unequal, so the Changing Pattern of the width on the weir between particularly adjacent two spiral chutes of spiral fluted width and common single-screw angle spiral chute α
1=α
2The time Changing Pattern be different, represent this secondary cell wall pitch angle alpha will with E among Fig. 4
eWith major trough wall pitch angle alpha will
1Secondary cell wall molded lines when equating.Spiral fluted normal direction width S
1It is more violent to narrow down gradually from the outer radial internal diameter, the normal direction width S on the weir between two adjacent spiral chutes
2From external diameter is that the upstream is that the downstream broadens gradually or remains unchanged to internal diameter; And work as α
1=α
2The time, the normal direction width S on weir
2From external diameter is that the upstream is that the downstream narrows down gradually to internal diameter.The spiral chute of being made up of two unequal cell wall molded lines of helix angle like this has the downstream of being from upstream to by the wide outstanding feature more that narrows down, and promptly the convergence of runner is stronger, more helps the compression of gas.| α
1| optimum range be 10 °-20 °; | α
2| optimum range be 5 °-15 °.Dotted line E among Fig. 4 represents the molded lines of secondary cell wall in the common single-screw angle spiral chute, its pitch angle alpha will
ePitch angle alpha will with major trough wall M
1Equate.
Fig. 5 is spiral fluted enlarged view among Fig. 4, has schematically shown the situation of change of the spiral chute degree of depth especially.Spiral fluted degree of depth h radially can change, from external diameter be the upstream to internal diameter be the downstream gradually from depth to shallow, its scope is 0～0.2mm, upstream groove depth h
2Optimum range be 0.005～0.012mm, downstream groove depth h
1Optimum range be 0～0.007mm.
The inside and outside circle of seal face between rotating ring and the stationary ring is represented in double dot dash line among Fig. 4 and Fig. 5.The effective radial height of spiral fluted is (R in Fig. 4 and Fig. 5
3-R
1).
A spiral fluted " radial height " is meant the height of a spiral chute in the seal face scope that rotating ring and stationary ring are fitted each other, i.e. effective height.
In this embodiment, suppose that the outside of seal face is upstream H for the high pressure side, and its inboard is downstream L for low voltage side.
Embodiment two: only be that with the difference of embodiment's one structure spiral chute 13 is arranged on the seal face of stationary ring 14, sees also Fig. 2.In addition, spiral chute also can be arranged on the seal face of rotating ring and stationary ring (diagram is omitted) simultaneously.
Embodiment three: see also Fig. 6, Fig. 8 and Fig. 9.
Be that with the difference of embodiment's one structure the inboard of seal face among this embodiment is upstream H ' for the high pressure side, and its outside is downstream L ' for low voltage side.Spiral chute 16 is set on the seal face of rotating ring 15.Under given rotation direction, spiral chute with fluid-encapsulated along arrow G ' direction pumping downstream from the upstream.In addition, at the inboard plane endless belt 17 in addition of spiral fluted, promptly be in R
4With R
5Between endless belt, play throttling and parking sealer, can be referred to as to seal the dam, see also Fig. 6.
Fig. 8 represents spiral fluted shape and position on the seal face.The effective radial height of spiral fluted is (R in the figure
5-R
7).The inside and outside circle of the seal face that fits between rotating ring and the stationary ring is represented in double dot dash line among Fig. 8 and Fig. 9.
The spiral fluted molded lines is that the rotation direction of this moment is C ' with corresponding at the rotating ring fluting in Fig. 8 and Fig. 9; The major trough wall is the wall M ' that facings the wind, its pitch angle alpha will
1' bigger, line length is shorter, and secondary cell wall is leeward wall N ', its pitch angle alpha will
2' less, line length is longer, and like this, the spiral fluted width is that the upstream is that the downstream is narrowed down gradually by wide laterally from the inboard, and grooved is a convergent; Otherwise, if α
1'=α
2', then promptly swim over to the outside from the inboard be that the downstream broadens gradually to groove width, that is grooved disperses, and represents this secondary cell wall pitch angle alpha will with E ' among Fig. 8
e' with major trough wall pitch angle alpha will
1' secondary cell wall molded lines when equating.| α
1' | optimum range be 10 °-20 °; | α
2' | optimum range be 5 °-15 °; And | α
1' |＞| α
2' |.
Fig. 9 is spiral fluted enlarged view among Fig. 8, has schematically shown the situation of change of the spiral chute degree of depth especially.The degree of depth of groove can be from the inboard upstream be laterally the downstream by shoaling gradually deeply, i.e. h
2'＞h
1', h
2' optimum range be 0.005～0.012mm, h
1' optimum range be 0～0.007mm.
Embodiment four: only be that with the difference of embodiment's three structures spiral chute 18 is arranged on the seal face of stationary ring 19, sees also Fig. 7.In addition, spiral chute also can be arranged on the seal face of rotating ring and stationary ring (diagram is omitted) simultaneously.
In a word, the present invention is different from that existing grade in the document is dark, the essential characteristic of the two-dimensional helical groove face seals of equal helix angle is: the molded lines of forming two side channel walls of spiral fluted has different helix angles, for example embodiment one, and the helix angle of short major trough wall molded lines is α
1, the helix angle of long secondary cell wall molded lines is α
2, | α
1|＞| α
2|, the spiral fluted groove width of being made up of two such cell wall molded lines has the downstream of being from upstream to by the wide outstanding feature more that narrows down, and groove depth can have by on swim over to the downstream by the characteristics that deeply shoal gradually, thereby form three-dimensional convergence grooved, help the compression of gas, can obtain bigger fluid film thickness under the identical condition or can obtain bigger fluid film rigidity under identical fluid film thickness, the reliability of sealing is higher.
Implement sealing total arrangement of the present invention multiple pattern can be arranged: single sealing, face-to-face formula double-sealing, double-sealing, two-stage series connection sealing, three grades of series seals, double-sealings of formula seal combined sealing etc. with the combined or single sealing of single sealing with two-stage series connection back-to-back.
In addition, the sealing device also can be used for sealing the big liquid of ratio of viscosities gas, and for example embodiment one, at this moment pitch angle alpha will
1And α
2Optimum range and above-mentioned as broad as long; But spiral groove depth h
1And h
2Optimum range different with the above-mentioned scope that provides, the big more then groove depth of the viscosity of liquid is big more, decides according to concrete condition.
Sealing device of the present invention is the dynamic and static pressure mating type of a kind of novel fluid face seals, and its advantage is identical The thickness of fluid film or rigidity are bigger under the condition. The present invention be applicable to various types compressor, decompressor, seperator, The face seals of sealing device, the especially gas lubrication of the rotary fluid machines such as pump, reactor agitator is namely so-called Dry gas seals.
Claims (8)
1, a kind of double helix angle three-dimensional spiral groove face seals, form by the rotating ring that has seal face and the stationary ring that has seal face and other correlated parts, the seal face of this stationary ring and the seal face of rotating ring fit, two faying surfaces are the seal face of ring, one side of seal face is that the high pressure side is the upstream, the opposite side of seal face is that low voltage side is the downstream, the seal face rotation of the relative stationary ring of seal face of rotating ring, it is characterized in that: one group of double helix angle three-dimensional spiral groove is set at least one of described rotating ring seal face and stationary ring seal face, wherein, constitute the helix angle difference of the helix of two sidewalls about a spiral fluted, it is that the high pressure side is wideer that the spiral chute of being made up of them has the upstream, the downstream is the narrower convergence profile of low voltage side; And each spiral fluted degree of depth is from upstream to that the downstream shoals gradually or is invariable, thereby forms a kind of convergent contour spiral chute of three-dimensional; Under given rotation direction the spiral chute group with fluid-encapsulated be that the high pressure side is the low voltage side pumping downstream from the upstream; Also have a plane endless belt of not slotting promptly to seal the dam in the spiral fluted downstream.
2, double helix angle three-dimensional spiral groove face seals according to claim 1, it is characterized in that: the molded lines of spiral chute sidewall is for accurate on the seal face, or approximate log spiral is an equiangular helical spiral, wherein the side channel wall of windward side is the major trough wall, and the side channel wall of lee face is secondary cell wall.
3, double helix angle three-dimensional spiral groove face seals according to claim 1 and 2 is characterized in that: the scope of the helix angle of spiral chute sidewall molded lines is 5 °-20 °.
4, double helix angle three-dimensional spiral groove face seals according to claim 2, it is characterized in that: the scope of the helix angle of spiral chute sidewall major trough wall molded lines is 10 °-20 °, the helix angle scope of secondary cell wall molded lines is 5 °-15 °, and the helix angle of major trough wall molded lines is greater than the helix angle of secondary cell wall molded lines.
5, double helix angle three-dimensional spiral groove face seals according to claim 1, it is characterized in that: spiral chute sidewall molded lines is a log spiral, or being similar to the circular arc line of log spiral, the center of circle of this circular arc line is eccentric with respect to the center of circle of ring packing end face.
6, double helix angle three-dimensional spiral groove face seals according to claim 1, it is characterized in that: the spiral fluted degree of depth is constant, depth bounds is 0.002～0.2mm.
7, double helix angle three-dimensional spiral groove face seals according to claim 1, it is characterized in that: the spiral fluted degree of depth radially changes, from the upstream be the high pressure side be downstream low voltage side gradually from depth to shallow, its scope is 0～0.2mm.
8, double helix angle three-dimensional spiral groove face seals according to claim 1, it is characterized in that: the scope of spiral chute upstream groove depth is 0.005～0.012mm, and the optimum range of downstream groove depth is 0～0.007mm, and the upstream groove depth is greater than the downstream groove depth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021464499A CN1272563C (en) | 2002-11-07 | 2002-11-07 | Unit for sealing end surface of 3D helical flute with double helix angles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021464499A CN1272563C (en) | 2002-11-07 | 2002-11-07 | Unit for sealing end surface of 3D helical flute with double helix angles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1415877A CN1415877A (en) | 2003-05-07 |
| CN1272563C true CN1272563C (en) | 2006-08-30 |
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ID=4751078
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021464499A Expired - Fee Related CN1272563C (en) | 2002-11-07 | 2002-11-07 | Unit for sealing end surface of 3D helical flute with double helix angles |
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|---|---|
| CN (1) | CN1272563C (en) |
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| CN101846143A (en) * | 2010-06-23 | 2010-09-29 | 北京理工大学 | Seal ring with even-depth spiral groove on end face |
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- 2002-11-07 CN CNB021464499A patent/CN1272563C/en not_active Expired - Fee Related
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| CN101846143A (en) * | 2010-06-23 | 2010-09-29 | 北京理工大学 | Seal ring with even-depth spiral groove on end face |
| CN107218395A (en) * | 2017-07-06 | 2017-09-29 | 浙江工业大学 | Ternary distorts type groove end surface mechanical sealing structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1415877A (en) | 2003-05-07 |
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Owner name: JOHN CRANE TECHNOLOGY (TIANJIN) CO., LTD. Free format text: FORMER OWNER: JOHN CRANE TIMING SEALS (TIANJIN) CO., LTD. Effective date: 20120214 |
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Effective date of registration: 20120214 Address after: 300384 Tianjin New Technology Industrial Park Huayuan Industrial Area (outer ring) Haitai Huake Road No. 9 Patentee after: JOHN CRANE TECHNOLOGY (TIANJIN) Co.,Ltd. Address before: 300384 Tianjin City, Nankai District Huayuan Industrial Park No. 14 yuan Lu GUI Patentee before: Johnkerlan-Dingming Sealing (Tianjin) Co.,Ltd. |
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Granted publication date: 20060830 Termination date: 20211107 |