CN214499290U - Sealing device for improving sealing performance of guide vane end face - Google Patents
Sealing device for improving sealing performance of guide vane end face Download PDFInfo
- Publication number
- CN214499290U CN214499290U CN202120520566.2U CN202120520566U CN214499290U CN 214499290 U CN214499290 U CN 214499290U CN 202120520566 U CN202120520566 U CN 202120520566U CN 214499290 U CN214499290 U CN 214499290U
- Authority
- CN
- China
- Prior art keywords
- sealing
- sealing strip
- face
- guide vane
- piece
- 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.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Hydraulic Turbines (AREA)
Abstract
The utility model provides an improve sealing device of stator terminal surface sealing performance, it includes support piece, sealing strip, locating part and fastener, sets up the sealing strip through the support piece upside, and the locating part is located sealing strip both sides rather than the pressfitting, and the fastener passes the locating part rather than the cooperation, and support piece and sealing strip are located between two locating parts, and the stator terminal surface contacts with the sealing strip. The utility model discloses it is complicated to overcome former stator structure, and is sealed inseparable, and cavitation erosion and washing away cause the problem that sealed life reduces, have simple structure, and sealing performance is good, is favorable to reducing cavitation erosion and washing away, improves life, easy operation convenient characteristics.
Description
Technical Field
The utility model belongs to the technical field of it is sealed, a improve sealing device of stator end face seal performance is related to.
Background
The end face seal of the guide vane of the water turbine is a necessary device of the water turbine generator set, and means that when the movable guide vane is fully closed, the seal for preventing water leakage between the end face of the guide vane body and the top cover and the bottom ring ensures the normal function of the water turbine generator set. The sealing structure of the guide vane end face of the existing water turbine is more complex, and the sealing strip is not tightly attached to the sealing surface, so that cavitation erosion and the erosion of silt water flow are caused, and the service life is shortened.
Disclosure of Invention
The utility model aims to solve the technical problem that a sealing device for improving stator end face sealing performance is provided, simple structure adopts and sets up the sealing strip at the support piece upside, and the locating part is located sealing strip both sides and its pressfitting, fastener and locating part cooperation, and sealing strip and support piece are located between two locating parts, and the sealing strip is contradicted with the stator end face, and sealing performance is good, is favorable to reducing cavitation erosion and erodees, improves life, and easy operation is convenient.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a sealing device for improving the sealing performance of the end face of a guide vane comprises a supporting piece, a sealing strip, a limiting piece and a fastener; the sealing strip is positioned on the upper side surface of the supporting piece, the limiting pieces are positioned on two sides of the sealing strip and matched with the sealing strip, and the fastening piece penetrates through the limiting pieces and is matched with the limiting pieces; the upper end surface of the fastener and the upper side surface of the limiting piece are positioned on the same horizontal plane, and the upper side surface of the sealing strip is higher than the upper side surface of the limiting piece; the upper side surface of the sealing strip is pressed and then is in close contact with the end surface of the guide vane, and the supporting piece is pressed to extrude the sealing strip.
The cross section of the supporting piece is parallel to the upper side and the lower side, the left side and the right side of the supporting piece are of diamond structures protruding outwards, and the water caltrops protruding outwards are of arc structures.
The downside of support piece sets up the pressure chamber of indent, pressure port and pressure chamber intercommunication.
The sealing strip includes the clamp plate of being connected with the seal downside, and the cross section of seal is the rectangle structure, is located both sides and sets up the domatic of downward sloping.
The sealing strip is made of PET-P or PEEK.
The cross section of locating part is the rectangle structure, and the counter bore is rather than vertical running through, is located rectangle structure one side and sets up the briquetting, and the briquetting is parallel with the side on the rectangle structure.
The fastener is a hexagon socket head cap screw, and the head part of the fastener is provided with a sealing anti-loose filler matched with the fastener.
The sealing anti-loosening filler is made of epoxy resin materials, can fill up the gap of the head of the hexagon socket head screw at will, and is tightly matched with the clamping groove of the head of the hexagon socket head screw.
The sealing method of the sealing device for improving the sealing performance of the end face of the guide vane comprises the following steps:
s1, mounting a support piece, wherein the guide vane is in a fully-opened state, placing the support piece in a mounting groove of the bottom ring, the opening of a pressure cavity faces the bottom of the mounting groove and is in contact with the mounting groove, and a pressure hole faces the volute side;
s2, mounting a sealing strip, placing the sealing strip on a support member, and enabling a pressing plate to be in contact with the upper side face of the support member; the sealing strip is positioned between the two movable guide vanes.
S3, installing a limiting piece, clamping the limiting piece into two sides of the installation groove of the bottom ring, and pressing a pressing block on a pressing plate of the sealing body;
s4, locking, wherein an inner hexagonal bolt of the fastener penetrates through a counter bore of the limiting piece to be fixedly connected with the bottom ring, the head of the inner hexagonal bolt is filled with a sealing anti-loose filler, and the upper side surface of the filler and the upper side surface of the limiting piece are positioned on the same horizontal plane;
at S4, the pressure hole of the locked support is communicated with the pressure water at the high-pressure side of the volute;
s5, repeating S1-S4, and installing a top cover sealing structure; the top cover sealing structure and the bottom ring structure are symmetrical to each other;
s6, sealing, fully closing the movable guide vane, sliding the end face of the guide vane to the upper side face along the slope of the sealing body of the sealing strip, driving the sealing body to push and press the supporting piece, compressing the supporting piece, and finally contacting the end face of the guide vane with the sealing body to realize sealing;
in S6, when the supporting member is pressed, the pressure water on the volute side enters the pressure chamber from the pressure hole, and the pressure of the supporting member is applied, and the pressure acts on the sealing strip through the supporting member, so as to increase the degree of compression between the sealing body and the end surface of the guide vane.
A sealing device for improving the sealing performance of the end face of a guide vane comprises a supporting piece, a sealing strip, a limiting piece and a fastener; the sealing strip is positioned on the upper side surface of the supporting piece, the limiting pieces are positioned on two sides of the sealing strip and matched with the sealing strip, and the fastening piece penetrates through the limiting pieces and is matched with the limiting pieces; the upper end surface of the fastener and the upper side surface of the limiting piece are positioned on the same horizontal plane, and the upper side surface of the sealing strip is higher than the upper side surface of the limiting piece; the upper side surface of the sealing strip is pressed and then contacts with the end surface of the guide vane, and the supporting piece is pressed to extrude the sealing strip. Simple structure sets up the sealing strip through the support piece upside, and the locating part is located sealing strip both sides rather than the pressfitting, and the fastener passes locating part and rather than the cooperation, and support piece and sealing strip are located between two locating parts, stator terminal surface and sealing strip contact, and sealing performance is good, is favorable to reducing cavitation erosion and erodees, improves life, and easy operation is convenient.
In a preferred scheme, the cross section of the supporting piece is in a rhombus structure with the upper side and the lower side parallel, the left side and the right side of the supporting piece are convex outwards, and the water caltrops convex outwards are in an arc structure. Simple structure, during the installation, the water caltrop of support piece both sides is the arc structure, and the facial line contact of face with the installation body before the pressurized, extrusion deformation forms the face contact after the pressurized, improves sealing performance.
In a preferred embodiment, the underside of the support element is provided with a concave pressure chamber, with which the pressure opening communicates. The structure is simple, when in use, the pressure source enters the pressure cavity from the pressure hole, and the reverse thrust action is formed when the supporting piece is pressed.
In a preferred scheme, the sealing strip comprises a pressing plate connected with the lower side face of the sealing body, the cross section of the sealing body is of a rectangular structure, and two sides of the sealing body are provided with slopes inclining downwards. Simple structure, during the use, the clamp plate is pushed down by the locating part, and the domatic lower border of seal both sides is the side parallel and level on with the locating part.
In a preferred scheme, the material of the sealing strip is PET-P or PEEK. The PET-P or PEEK sealing strip is adopted, the high polymer material greatly buffers cavitation damage and abrasion, and when cavitation occurs, the body is protected from cavitation damage, and the cavitation erosion resistance effect is achieved.
In an optimal scheme, the cross section of the limiting part is of a rectangular structure, the counter bore vertically penetrates through the limiting part, a pressing block is arranged on one side of the rectangular structure, and the pressing block is parallel to the side face of the rectangular structure. Simple structure, during the use, hexagon socket head cap screw's head position avoids rubbing with the stator terminal surface in the counter bore, and the clamp plate of sealing strip is pushed down to the briquetting, and restriction sealing strip and support piece take place the displacement.
In a preferred scheme, the fastener is a hexagon socket head cap screw, and the sealing anti-loose packing matched with the fastener is arranged at the head part. Simple structure, during the use, through sealed locking filler seal hexagon socket head cap screw head, avoid hexagon socket head cap screw to receive the cavitation erosion, can also prevent that the bolt is not hard up.
In a preferred scheme, the sealing anti-loose filler fills up the gap of the head of the hexagon socket head. Simple structure, during the use, the draw-in groove of sealing filler and hexagon socket head cap head closely cooperates, avoids sealed locking filler to break away from at the operation process, and is sealed effectual.
The utility model provides an improve sealing device of stator terminal surface sealing performance, it includes support piece, sealing strip, locating part and fastener, sets up the sealing strip through the support piece upside, and the locating part is located sealing strip both sides rather than the pressfitting, and the fastener passes the locating part rather than the cooperation, and support piece and sealing strip are located between two locating parts, and the stator terminal surface contacts with the sealing strip. The utility model discloses it is complicated to overcome former stator structure, and is sealed inseparable, and cavitation erosion and washing away cause the problem that sealed life reduces, have simple structure, and sealing performance is good, is favorable to reducing cavitation erosion and washing away, improves life, easy operation convenient characteristics.
Drawings
The invention will be further explained with reference to the following figures and examples:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the supporting member of the present invention.
Fig. 3 is a schematic structural diagram of the sealing strip of the present invention.
Fig. 4 is a schematic structural diagram of the locating part of the present invention.
Fig. 5 is a schematic structural view of the fastener of the present invention.
In the figure: the sealing device comprises a supporting piece 1, a pressure cavity 11, a pressure hole 12, a sealing strip 2, a sealing body 21, a pressing plate 22, a limiting piece 3, a counter bore 31, a pressing block 32, a fastening piece 4 and sealing anti-loosening filler 41.
Detailed Description
As shown in fig. 1 to 5, a sealing device for improving the sealing performance of the end face of a guide vane includes a supporting member 1, a sealing strip 2, a limiting member 3 and a fastening member 4; the sealing strip 2 is positioned on the upper side surface of the supporting piece 1, the limiting pieces 3 are positioned on two sides of the sealing strip 2 and matched with the sealing strip, and the fastening pieces 4 penetrate through the limiting pieces 3 and are matched with the sealing strip; the upper end surface of the fastener 4 and the upper side surface of the limiting piece 3 are positioned on the same horizontal plane, and the upper side surface of the sealing strip 2 is higher than the upper side surface of the limiting piece 3; the side surface on the sealing strip 2 is pressed and then contacts with the end surface of the guide vane, and the supporting piece 1 is pressed to extrude the sealing strip 2. Simple structure sets up sealing strip 2 through 1 upside of support piece, and locating part 3 is located sealing strip 2 both sides rather than the pressfitting, and fastener 4 passes locating part 3 rather than the cooperation, and support piece 1 and sealing strip 2 are located between two locating parts 3, and the stator terminal surface contacts with sealing strip 2, and sealing performance is good, is favorable to reducing cavitation erosion and erodees, improves life, and easy operation is convenient.
In the preferred scheme, the cross section of the support member 1 is in a rhombus structure with the upper side and the lower side parallel, the left side and the right side protruding outwards, and the water caltrops protruding outwards are in an arc structure. Simple structure, during the installation, the water caltrop of support piece 1 both sides is the arc structure, and the facial line contact of installation body side before the pressurized, extrusion deformation forms the face contact after the pressurized, improves sealing performance.
In a preferred scheme, a concave pressure cavity 11 is arranged on the lower side surface of the supporting part 1, and a pressure hole 12 is communicated with the pressure cavity 11. The structure is simple, when in use, the pressure source enters the pressure cavity 11 from the pressure hole 12, and the reverse thrust action is formed when the supporting member 1 is pressed.
In a preferred scheme, the sealing strip 2 comprises a pressing plate 22 connected with the lower side surface of the sealing body 21, the cross section of the sealing body 21 is of a rectangular structure, and two sides of the sealing body are provided with downward inclined slopes. Simple structure, during the use, clamp plate 22 is pushed down by locating part 3, and the lower border of domatic and the locating part 3 side parallel and level of sealing body 21 both sides.
In a preferred scheme, the material of the sealing strip 2 is PET-P or PEEK. By adopting the PET-P or PEEK sealing strip 2, the high polymer material greatly buffers cavitation damage and abrasion, and when cavitation occurs, the body is protected from cavitation damage, thereby playing a role in resisting cavitation.
In a preferable scheme, the cross section of the limiting member 3 is a rectangular structure, the counter bore 31 vertically penetrates through the rectangular structure, a pressing block 32 is arranged on one side of the rectangular structure, and the pressing block 32 is parallel to the upper side face of the rectangular structure. Simple structure, during the use, hexagon socket head cap screw's head is located counter bore 31, avoids rubbing with the stator terminal surface, and the clamp plate 22 of sealing strip 2 is pushed down to briquetting 32, and restriction sealing strip 2 and support piece 1 take place the displacement.
In a preferred scheme, the fastener 4 is a hexagon socket head cap screw, and a sealing anti-loose packing 41 matched with the fastener is arranged at the head part. Simple structure, during the use, through sealed locking filler 41 sealed socket head cap screw head, avoid socket head cap screw to receive cavitation erosion to prevent that the bolt from becoming flexible.
In a preferred embodiment, the sealing anti-loose filler 41 is made of epoxy resin material, and can fill up the gap between the heads of the hexagon socket head screws. Simple structure, during the use, sealed locking filler closely cooperates with the draw-in groove of hexagon socket head cap head, avoids sealed locking filler 41 to break away from at the operation process, and is sealed effectual.
When the sealing device for improving the sealing performance of the end face of the guide vane is installed and used, the sealing device for improving the sealing performance of the end face of the guide vane comprises a supporting piece 1, a sealing strip 2, a limiting piece 3 and a fastening piece 4; the sealing strip 2 is positioned on the upper side surface of the supporting piece 1, the limiting pieces 3 are positioned on two sides of the sealing strip 2 and matched with the sealing strip, and the fastening pieces 4 penetrate through the limiting pieces 3 and are matched with the sealing strip; the upper end surface of the fastener 4 and the upper side surface of the limiting piece 3 are positioned on the same horizontal plane, and the upper side surface of the sealing strip 2 is higher than the upper side surface of the limiting piece 3; the side surface on the sealing strip 2 is pressed and then contacts with the end surface of the guide vane, and the supporting piece 1 is pressed to extrude the sealing strip 2. Simple structure sets up sealing strip 2 through 1 upside of support piece, and locating part 3 is located sealing strip 2 both sides rather than the pressfitting, and fastener 4 passes locating part 3 rather than the cooperation, and support piece 1 and sealing strip 2 are located between two locating parts 3, and the stator terminal surface contacts with sealing strip 2, and sealing performance is good, is favorable to reducing cavitation erosion and erodees, improves life, and easy operation is convenient.
In a preferred scheme, the cross section of the supporting part 1 is in a rhombus structure with the upper side and the lower side parallel, the left side and the right side are protruded outwards, and the water caltrops protruded outwards are in an arc structure. Simple structure, during the installation, the water caltrop of support piece 1 both sides is the arc structure, and the facial line contact of installation body side before the pressurized, extrusion deformation forms the face contact after the pressurized, improves sealing performance.
In a preferred embodiment, the lower side of the support element 1 is provided with a concave pressure chamber 11, and the pressure hole 12 communicates with the pressure chamber 11. The structure is simple, when in use, the pressure source enters the pressure cavity 11 from the pressure hole 12, and the reverse thrust action is formed when the supporting member 1 is pressed.
In a preferred scheme, the sealing strip 2 comprises a pressing plate 22 connected with the lower side surface of the sealing body 21, the cross section of the sealing body 21 is of a rectangular structure, and slope surfaces which are inclined downwards are arranged on two sides. Simple structure, during the use, clamp plate 22 is pushed down by locating part 3, and the lower border of domatic and the locating part 3 side parallel and level of sealing body 21 both sides.
In a preferred scheme, the material of the sealing strip 2 is PET-P or PEEK. By adopting the PET-P or PEEK sealing strip 2, the high polymer material greatly buffers cavitation damage and abrasion, and when cavitation occurs, the body is protected from cavitation damage, thereby playing a role in resisting cavitation.
In a preferred scheme, the cross section of the limiting member 3 is a rectangular structure, the counter bore 31 vertically penetrates through the rectangular structure, a pressing block 32 is arranged on one side of the rectangular structure, and the pressing block 32 is parallel to the upper side face of the rectangular structure. Simple structure, during the use, hexagon socket head cap screw's head is located counter bore 31, avoids rubbing with the stator terminal surface, and the clamp plate 22 of sealing strip 2 is pushed down to briquetting 32, and restriction sealing strip 2 and support piece 1 take place the displacement.
In a preferred scheme, the fastener 4 is a hexagon socket head bolt, and a sealing anti-loose packing 41 matched with the fastener is arranged at the head part. Simple structure, during the use, through sealed locking filler 41 sealed socket head cap screw head, avoid socket head cap screw to receive the cavitation erosion.
In a preferred embodiment, the sealing anti-loose filler 41 is made of epoxy resin material, and can fill up the gap between the heads of the hexagon socket head screws. Simple structure, during the use, sealed locking filler closely cooperates with the draw-in groove of hexagon socket head cap head, avoids sealed locking filler 41 to break away from at the operation process, and is sealed effectual.
The above embodiments are merely preferred technical solutions of the present invention, and should not be considered as limitations of the present invention, and the features in the embodiments and the examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be defined by the claims and the technical solutions described in the claims, including the technical features of the equivalent alternatives as the protection scope. Namely, equivalent alterations and modifications within the scope of the invention are also within the scope of the invention.
Claims (8)
1. The utility model provides an improve sealing device of stator end face seal performance which characterized by: the sealing strip comprises a supporting piece (1), a sealing strip (2), a limiting piece (3) and a fastening piece (4); the sealing strip (2) is positioned on the upper side surface of the supporting piece (1), the limiting piece (3) is positioned on two sides of the sealing strip (2) and matched with the sealing strip, and the fastening piece (4) penetrates through the limiting piece (3) and is matched with the limiting piece; the upper end surface of the fastener (4) and the upper side surface of the limiting part (3) are positioned on the same horizontal plane, and the upper side surface of the sealing strip (2) is higher than the upper side surface of the limiting part (3).
2. The sealing device for improving the end face sealing performance of the guide vane according to claim 1, is characterized in that: the cross section of the support piece (1) is parallel to the upper side and the lower side, the left side and the right side are of diamond structures protruding outwards, and the water caltrops protruding outwards are of arc structures.
3. The sealing device for improving the end face sealing performance of the guide vane according to claim 1, is characterized in that: the lower side surface of the supporting piece (1) is provided with a concave pressure cavity (11), and the pressure hole (12) is communicated with the pressure cavity (11).
4. The sealing device for improving the end face sealing performance of the guide vane according to claim 1, is characterized in that: sealing strip (2) include clamp plate (22) of being connected with sealing (21) downside, the cross section of sealing (21) is the rectangle structure, is located both sides and sets up the domatic of downward sloping.
5. The sealing device for improving the end face sealing performance of the guide vane according to claim 1, is characterized in that: the sealing strip (2) is made of PET-P or PEEK.
6. The sealing device for improving the end face sealing performance of the guide vane according to claim 1, is characterized in that: the cross section of the limiting part (3) is of a rectangular structure, the counter bore (31) vertically penetrates through the counter bore, a pressing block (32) is arranged on one side of the rectangular structure, and the pressing block (32) is parallel to the side face of the rectangular structure.
7. The sealing device for improving the end face sealing performance of the guide vane according to claim 1, is characterized in that: the fastener (4) is an inner hexagon bolt, the head of the inner hexagon bolt is provided with a circle of clamping grooves, and a sealing anti-loose filler (41) matched with the head is arranged at the head.
8. The sealing device for improving the end face sealing performance of the guide vane according to claim 7, is characterized in that: the gap of the bolt head can be filled after the sealing anti-loosening filler (41) is installed, cavitation is reduced, the bolt is prevented from loosening, and the clamping groove of the inner hexagonal bolt head can prevent the sealing anti-loosening filler (41) from falling off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120520566.2U CN214499290U (en) | 2021-03-11 | 2021-03-11 | Sealing device for improving sealing performance of guide vane end face |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120520566.2U CN214499290U (en) | 2021-03-11 | 2021-03-11 | Sealing device for improving sealing performance of guide vane end face |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214499290U true CN214499290U (en) | 2021-10-26 |
Family
ID=78198371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120520566.2U Active CN214499290U (en) | 2021-03-11 | 2021-03-11 | Sealing device for improving sealing performance of guide vane end face |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214499290U (en) |
-
2021
- 2021-03-11 CN CN202120520566.2U patent/CN214499290U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN214499290U (en) | Sealing device for improving sealing performance of guide vane end face | |
| CN113153607A (en) | Sealing structure and method for end face of guide vane of water turbine | |
| CN201411667Y (en) | Pressurized extensible water seal for diversion tunnel gate | |
| CN213627844U (en) | Upper flange top cover closing and pre-tightening structure for high-water-head unit | |
| CN201757175U (en) | Tapered piece ring sealing device | |
| CN210769233U (en) | Diaphragm pump head leak-stopping structure | |
| CN115342193B (en) | Fracturing valve seat for petroleum drilling | |
| CN209243682U (en) | A kind of water seal arrangement of extra-high differential water pressures plane gate | |
| CN209990906U (en) | Sealing element for automobile crane | |
| CN203339641U (en) | Sealing assembly for cable wire of electric pump | |
| CN217866118U (en) | High-sealing manhole cover applied to storage tank | |
| CN215715104U (en) | Plane gate bottom water seal structure | |
| CN213016759U (en) | Hydraulic oil sealing structure of hydraulic pump | |
| CN201354869Y (en) | rubber-lining check valve on sealing surface | |
| CN216555642U (en) | Low-leakage sealing structure of valve rod | |
| CN201588958U (en) | High pressure parallel gate valve | |
| CN209818725U (en) | Universal water-stopping fastening suite | |
| CN212455735U (en) | Wedge-shaped pad combined self-sealing device of high-temperature and high-pressure valve | |
| CN214093949U (en) | Bearing oiling frock | |
| CN219062047U (en) | Sealing strip for middle open surface of water pump | |
| CN218294095U (en) | Water leakage prevention asphalt felt nail | |
| CN201588957U (en) | Knife gate plate sealing device of knife gate valve | |
| CN220956927U (en) | Novel cold flow prevention valve seat ball valve | |
| CN219795425U (en) | Oil outlet valve sealing structure of oil injection pump | |
| CN213115040U (en) | Contact waterproof structure of existing building and newly-built building |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |