CN213064613U - Packing type and follow-up type combined hydraulic generator working sealing device - Google Patents
Packing type and follow-up type combined hydraulic generator working sealing device Download PDFInfo
- Publication number
- CN213064613U CN213064613U CN202021415179.4U CN202021415179U CN213064613U CN 213064613 U CN213064613 U CN 213064613U CN 202021415179 U CN202021415179 U CN 202021415179U CN 213064613 U CN213064613 U CN 213064613U
- Authority
- CN
- China
- Prior art keywords
- sealing
- support
- water
- sealed
- block
- 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 a hydraulic generator work sealing device of filler formula and trailing type combination, belongs to among the hydroelectric power generation technical field water turbine work sealing technical field, stagnant water axle sleeve outside is by supreme sealed support, the sealed piece of lower floor, seal carrier I, the sealed piece of upper strata, seal carrier II of being equipped with in proper order down, sets up the sealed piece of lower floor between seal support and the seal carrier I, sets up the sealed piece of upper strata between seal carrier I and the sealed seal carrier II, sealed piece outer lane is equipped with U type groove, is equipped with spring restraint in it and forms wholly, sealed piece belowBe equipped with the guide block, be equipped with sealed water inlet on the sealed support I, form lubricated water cavity and sealed water cavity. The utility model discloses at hydraulic turbine because of higher, the installation elevation of unit of tailwater water level lower, the suction heightH S The tail water tunnel is low, and has good sealing effect when being long.
Description
Technical Field
The utility model belongs to the technical field of among the hydroelectric power generation technical field hydraulic turbine work sealing, concretely relates to hydraulic generator work sealing device of filler formula and trailing type combination.
Background
At present, in the field of hydroelectric power generation, there are several types of hydraulic seals for water turbine, including end-face hydraulic seal, single-double-layer flat seal, mechanical end-face seal, water pump seal, or two or more combined seals. Although the working seals of the water turbine are formed products and are basically applied to the unit with the positive installation elevation of the unit, the tail water level of the water turbine is higher, the installation elevation is negative, and the suction height is highH S When the tunnel is longer at minus 6 to minus 20m, the working seal can not play a good water stopping effect.
Besides bearing higher tail water pressure, the working seal can bear the water return surge in the process that tail water flows from rest when the working seal is in normal operation. The stability of the working seal is poor, and the water leakage is greatly influenced by the fluctuation of the tail water level.
As shown in figure 1, the structure diagram of the hydraulic seal of the piston end face of a power station is shown, the seal structure is flexible in test on a test bed, but after field installation, the water leakage amount is large, on one hand, the water leaks from a pin gap, and on the other hand, the water inlet is too high, and the water leaks from the outer side of a seal block. During test operation, the water leakage amount is large.
The analysis reason is as follows: the tail water level of the power station is too high and the suction height is too highH S Between-7.5 and-15.7 m, generally-8 m.
Hydro turbine installation elevation = +d+H S ’ I.e. byH S ’ =▽-▽d
In the formulaH S ’ -nominal suction height, m;
▽d-tail water level elevation, m;
vertical axial flow water turbineH S ’ =H S Therefore, it isH S =▽-▽d The grain size is = -7.5 to-15.7 m, and the grain size is-8 m generally;
therefore, the water level of the tail water is 7.5-15.7 m higher than the installation height of the unit.
And because the length of the tailwater tunnel is 120m, the working seal bears higher pressure of tailwater, and can bear the water return surge from the standstill to the flowing process of the tailwater during normal operation. The stability of the piston type section hydraulic sealing water is poor, and the water leakage is greatly influenced by the fluctuation of the tail water level. When the work seal is reconstructed and designed, the special condition cannot be considered, and the main reason for the failure of the work seal reconstruction is that the work seal reconstruction is failed.
In 2013, the unit is maintained at the A level, the working sealing packing of the water turbine is replaced, the packing is a polytetrafluoroethylene carbon packing, and the working sealing water leakage is good after maintenance. In 2014, the water leakage amount of the working seal is gradually increased, and the effect is not ideal after the packing is pressed by stopping for many times every time. After the machine set is repaired for a short time, the opening of the sealing shaft sleeve is cracked, 4 limiting blocks welded below the sealing shaft sleeve are cracked, and part of the limiting blocks falls off, and the sealing shaft sleeve rotates on the water turbine shaft, so that the shaft collar at the mounting position of the sealing shaft sleeve is scratched, and the sealing shaft sleeve is deformed.
The analysis reason is as follows: the work sealing water stopping bush is not enough in opening bolt fastening force and infirm in welding of the limiting block, the limiting block cannot play a limiting and restricting role after the unit is started, the water stopping bush moves relative to a water turbine shaft under the tight pressure of the sealing packing, and finally the bush limiting block falls, the water stopping bush deforms and the shaft collar is scratched.
Analyzing the reasons, when the water stopping bush is re-installed, firstly, the scratch shaft collar at the installation position of the water stopping bush is ground. Because of the bush warp, adopted 4 10T presses to carry out the symmetry top-mounting in the installation, guaranteed to butt seamless to 8 bush stoppers have been increased, guarantee welding process in the welding and in order to prevent the welding seam fracture, and 4 spacing jackscrews have been installed in the drilling tapping on stagnant water axle sleeve and hydraulic turbine axle mounted position, prevent stagnant water axle sleeve and hydraulic turbine axle relative rotation. As shown in fig. 2, a packing seal seat, an i-shaped ring, a packing and a packing pressure ring are sequentially arranged above the seal support. The sealing and water stopping effect is not good after the unit is overhauled.
The main reasons are as follows: the packing type sealing can not compensate automatically, and has higher requirements on the ovality of the water stopping shaft sleeve and the concentricity of the water turbine shaft. Because of the deformation of the water stopping shaft sleeve, the ovality of the water stopping bush and the concentricity of the water turbine shaft cannot be guaranteed in the installation process, and after the unit operates, the water stopping shaft sleeve and the water turbine shaft rotate together to scrape a gap between the sealing packing, which is the main reason for sealing and water leakage of the pressure packing after the overhaul.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a hydraulic generator work sealing device of filler formula and follow-up formula combination through set up follow-up seal on the sealed support of work (if the sealed support space is enough big, can set up follow-up seal in sealed support) to reach and solved because of former sealed job stabilization nature poor, receive the undulant great purpose that causes of stagnant water leakage volume greatly that influences of the fluctuation of tailwater water level.
The utility model adopts the following technical scheme:
the utility model provides a hydraulic generator work sealing device of filler formula and trailing type combination, is including supporting lid or top cap, shroud ring seat, hydraulic turbine main shaft, sealed support, stagnant water axle sleeve, sealed support is fixed in on the shroud ring seat, and the shroud ring seat is fixed in and supports lid or top cap, and stagnant water axle sleeve cover is located on the hydraulic turbine main shaft, stagnant water axle sleeve outside is equipped with sealed support, lower floor's sealed piece, sealed support I, upper seal piece, sealed support II by supreme down in proper order, sets up lower floor's sealed piece between sealed support and the sealed support I, sets up upper seal piece between sealed support I and the sealed support II, sealed piece outer lane is equipped with U type groove, is equipped with spring restraint in it and forms wholly, sealed piece below is equipped with the guide block, be equipped with sealed water inlet on the sealed support I, form lubricated water cavity and sealed water cavity.
Furthermore, the cross section of the sealing support is of an I-shaped structure formed by welding, and the cross sections of the sealing support I and the sealing support II are of L-shaped structures.
Furthermore, the lower layer sealing block and the upper layer sealing block are all formed into a circular shape by connecting six fan-shaped sealing blocks end to end.
Furthermore, the joints of the fan-shaped sealing blocks connected end to end are in a circular shape formed by inserting concave-convex structures.
Furthermore, a guide block is arranged below each sector sealing block in the lower-layer sealing block and the upper-layer sealing block, and six guide blocks are arranged on each layer.
Furthermore, on the top surface of the lower sealing block and the bottom surface of the upper sealing block, two lubricating water holes are arranged on one side, close to the sealing support I, of each fan-shaped sealing block, and the two lubricating water holes are communicated with a vertical surface, in contact with the water stopping shaft sleeve, of each sealing block.
Furthermore, the water stopping shaft sleeve, the sealing support I and the sealing support II are all made of stainless steel materials.
The utility model discloses mainly solve the hydraulic turbine because of the tailwater water level higher, the installation elevation of unit is lower, the high HS of suction is when-6 to-20 m, the work of unit is sealed except bearing higher tailwater pressure, still bearing because of the tailwater tunnel is longer, the tailwater is by static to the water return surge of flow in-process when the unit normal operating, the work sealing stability that causes is relatively poor, the volume of leaking water receives the great problem of fluctuation influence of tailwater water level.
The utility model discloses an advantage and effect do:
the utility model provides a hydraulic turbine because of the tailwater water level is higher, the installation height of unit is lower, the suction heightH S And when the tail water tunnel is long, the water leakage amount of the working seal of the water turbine is large, and the factory building is flooded by water. The utility model discloses can the wide utilization in vertical, horizontal hydroelectric set, consequently the restraint that the follow-up seal passes through the spring forms wholly, through the radial force of water pressure and spring restraint for the follow-up seal tightly pastes on sealed axle sleeve or axle collar, and self-interacting ability is strong, not receive sealed water effect better. The follow-up sealing block is made of high polymer materials, has the characteristics of wear resistance, high temperature resistance, aging resistance, self lubrication and the like, has small contact wear on the shaft diameter, prolongs the service life of the working seal and has long service life.
Drawings
FIG. 1: the piston type end face water pressure sealing structure of the existing hydropower station is schematically shown;
FIG. 2: schematic diagram of a packing type sealing structure of an existing hydropower station;
FIG. 3: the application discloses a structural schematic diagram of a packing type and follow-up type combined hydraulic generator working sealing device;
FIG. 4: a schematic structural diagram of the sealing block;
FIG. 5: the upper layer sector sealing block is in a schematic structure view;
FIG. 6: the inner side structure schematic diagram of the upper layer sector sealing block;
FIG. 7: fig. 5 is a cross-sectional view B-B.
In the figure: 1. the sealing device comprises a supporting cover or a top cover, 2. a shroud ring seat, 3. a main shaft of the water turbine, 4. a shroud ring, 5. a sealing support, 6. a water stopping shaft sleeve, 7. a packing sealing seat, 8. an I-shaped ring, 9. a packing, 10. a packing press ring, 11. a limiting block, 12. a guide block, 13. a lower layer sealing block, 14. a sealing support I, 15. a spring, 16. an upper layer sealing block, 17. a sealing support II, 18. a piston ring sealing seat, 19. a piston ring, 20. a sealing mirror plate or a sealing swivel ring.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
The utility model relates to a hydraulic generator work sealing device of filler formula and trailing type combination mainly comprises parts such as surrounding band seat, sealed support, sealing support I, sealing support II, sealed piece, stagnant water axle sleeve, spring, guide block, supply channel, sees figure 3. The sealing support is fixed on the shroud ring seat, and the shroud ring seat is fixed on the supporting cover or the top cover. The main shaft is sleeved with the water stopping shaft sleeve, and the sealing support, the lower-layer sealing block, the sealing support I, the upper-layer sealing block and the sealing support II are sequentially arranged outside the water stopping shaft sleeve from bottom to top. The water stopping shaft sleeve, the sealing support I and the sealing support II are all made of stainless steel. The sealing support is of an I-shaped structure formed by welding, and the sealing support I and the sealing support II are of L-shaped structures respectively. Set up the sealed piece of lower floor between sealed support and the sealed support I, set up the sealed piece of upper strata between sealed support I and the sealed support II. The upper and lower sealing blocks are respectively formed into a circular shape by 6 fan-shaped sealing blocks inserted end to end, and the outer ring U-shaped groove of the sealing block is connected together by 6 stainless steel spring hooks to form a whole body. The guide blocks are arranged below the fan-shaped sealing blocks on the upper layer and the lower layer, 6 guide blocks are arranged on each layer and are respectively fixed on the sealing support I and the sealing support II, and the guide function of preventing the sealing blocks from rotating along with the shaft of the water turbine and limiting the sealing blocks to move only in the axial center radial direction is achieved. The sealed water inlet is arranged on the sealed bracket I, and the lubricating water cavity and the sealed water cavity are shown in figure 3. Each fan-shaped sealing block of upper and lower floor all has 2 lubricated water holes to lead to the facade of sealing block and stagnant water axle sleeve contact in closing close to I side of sealed support (upper sealing block is in the bottom surface, lower floor's sealing block is at the top surface), as shown in figure 4, the water film through the clean water establishment of supplying with plays sealed, lubricated and cooling action between sealing block and the stagnant water axle sleeve.
The sealing block is made of high polymer material, and the material has the characteristics of good abrasion resistance, long service life and the like. The water stopping shaft sleeve is made of ZG06Cr13Ni4Mo, and the material has the characteristics of good abrasion resistance, cavitation resistance and the like. When the unit operates, the working seal needs to be lubricated by clean water, the pressure of a seal water cavity formed by introduced lubricating water is higher than the pressure of a leakage water cavity, so that the leakage of the pressure water between the sealed supporting cover (top cover) and the main shaft is less, most of the leaked water is sealed lubricating water, and the water is continuously used as the filler type sealed lubricating water of the upper polytetrafluoroethylene packing. The upper and lower layers of sealing blocks are positioned between the sealing supports, the sealing blocks form a whole body through the restraint of the stainless steel spring, and the follow-up sealing blocks are tightly attached to the water stop shaft sleeve through the combined action of the water pressure and the radial force restrained by the spring. When the unit normally operates, a water film is established between the sealing block and the water stopping shaft sleeve through supplied clean water, the water film plays roles in sealing, lubricating and cooling, and the abrasion of the sealing block is reduced. When the sealing surface of the sealing block is abraded, the upper and lower sealing blocks move radially under the action of water pressure and the restraint of the spring, and the self-compensation effect of the sealing block is achieved.
The combined sealing structure formed by two layers of radial follow-up seals and the original filling seal can reduce the water leakage of the working seal.
The utility model adopts the combined sealing structure of the packing type and the follow-up sealing, the packing type sealing has better stability, abrasion resistance and water leakage amount not influenced by the fluctuation of the tail water level, but the packing type sealing has higher requirements on the ovality and the concentricity of the sealing surface and has no self-adjusting capability, and the packing adopts the polytetrafluoroethylene carbon packing and has the characteristics of high temperature resistance and self-lubricating; the servo sealing structure has the advantages that the servo sealing structure is high in self-adjusting capacity, the sealing block is composed of a plurality of small equally-divided sealing blocks, the head and the tail of the sealing block are connected in an inserting mode through concave-convex structures, the sealing block is restrained in a U-shaped groove in the outer ring of the sealing block through a stainless steel spring to form a whole, when the sealing surface of the sealing block is abraded, the servo sealing block moves radially under the action of water pressure and spring restraint, and the self-compensating effect of the sealing block is achieved. The packing type and follow-up sealing combined sealing structure can complement the defects, make up for the deficiencies and reduce the water leakage of the working seal.
The follow-up sealing block is made of high polymer materials and has the characteristics of wear resistance, high temperature resistance, aging resistance, self lubrication, long service life and the like.
The working sealing lubricating water is clean, and a small filter can be added after a main technology water supply filter if necessary, so that the pollution is discharged periodically; secondly, the water pressure, the lubricating water pressure is larger than the runner upper cavity pressure or the tail water pressure when the unit operates (when the runner upper cavity pressure is measured) is not available; and secondly, the water quantity, namely the water supply quantity, is required to meet the maximum water supply quantity value of the quantitative analysis of the operation performance of the servo seal.
The utility model discloses a seal structure of packing formula seal and follow-up seal looks combination formula. The stuffing type seal has good stability, is wear-resistant, has no influence of the fluctuation of the tail water level on the water leakage amount, has high requirements on the ovality and the concentricity of a sealing surface, has no self-adjusting capacity, adopts a polytetrafluoroethylene carbon packing for stuffing, and has the characteristics of high temperature resistance and self-lubrication; the servo sealing has strong self-adjusting capacity, the sealing block is composed of a plurality of small sealing blocks which are equally divided, the joint is spliced by adopting a concave-convex structure and is restrained in a U-shaped groove in the outer ring of the sealing block through a stainless steel spring to form a whole, when the sealing surface of the sealing block is worn, the servo sealing block moves radially under the action of water pressure and spring restraint, and the self-compensation effect of the sealing block is achieved. The more the sealing blocks are, the stronger the circular seal formed by the sealing blocks is, and the follow-up type is, so that the circular seal is not influenced by the concentricity and the ellipticity of the sealing shaft sleeve or the shaft collar at the contact part. A guide block is arranged below each sealing block, and the sealing blocks can only move radially under the restraint of springs, so that the sealing blocks are prevented from rotating along with the operation of the sealing shaft sleeve or the main shaft.
The follow-up sealing block is made of high polymer materials and has the characteristics of wear resistance, high temperature resistance, aging resistance, self lubrication, long service life and the like.
The combined sealing structure has the advantages that the related metal parts are made of stainless steel materials, and the combined sealing structure is rust-proof and corrosion-resistant in water, convenient to disassemble and assemble, long in service life and the like.
The servo sealing block in the utility model adopts high molecular material, nylon (but the hydrophilicity is considered when in use), and metal alloy with the characteristics of wear resistance, high temperature resistance and the like; the packing in the packing seal adopts a polytetrafluoroethylene carbon packing and can also be replaced by a high-water-base packing.
The utility model discloses adopt two-layer follow-up seal in the combination formula is sealed, if the space is enough, can adopt the multilayer to arrange, sealed effect can be better.
Claims (7)
1. The utility model provides a hydraulic generator work sealing device of filler formula and trailing type combination, is including supporting lid or top cap (1), shroud seat (2), hydraulic turbine main shaft (3), sealed support (5), stagnant water axle sleeve (6), sealed support (5) are fixed in on shroud seat (2), and shroud seat (2) are fixed in and support lid or top cap (1), and on hydraulic turbine main shaft (3) were located to stagnant water axle sleeve (6) cover, its characterized in that: the sealing device is characterized in that a sealing support (5), a lower-layer sealing block (13), a sealing support I (14), an upper-layer sealing block (16) and a sealing support II (17) are sequentially arranged outside the water stopping shaft sleeve (6) from bottom to top, the lower-layer sealing block (13) is arranged between the sealing support (5) and the sealing support I (14), the upper-layer sealing block (16) is arranged between the sealing support I (14) and the sealing support II (17), a U-shaped groove is formed in the outer ring of the sealing block, a spring is arranged in the U-shaped groove in a constrained mode to form a whole, a guide block (12) is arranged below the sealing block, a sealing water inlet is formed in the sealing support I (14), and a.
2. The packing type and following type combined hydraulic generator working sealing device according to claim 1, wherein: the cross section of the sealing support (5) is of an I-shaped structure formed by welding, and the cross sections of the sealing support I (14) and the sealing support II (17) are of L-shaped structures.
3. The packing type and following type combined hydraulic generator working sealing device according to claim 1, wherein: the lower-layer sealing block (13) and the upper-layer sealing block (16) are all formed into a circular shape by connecting six fan-shaped sealing blocks end to end.
4. The packing type and following type combined hydraulic generator working sealing device according to claim 3, wherein: the joints of the fan-shaped sealing blocks connected end to end are of concave-convex structures and are spliced to form a circle.
5. The packing type and following type combined hydraulic generator working sealing device according to claim 3, wherein: and a guide block (12) is arranged below each sector sealing block in the lower sealing block (13) and the upper sealing block (16), and six guide blocks (12) are arranged on each layer.
6. The packing type and following type combined hydraulic generator working sealing device according to claim 3, wherein: on the top surface of lower floor's sealed piece (13), the bottom surface of upper strata sealed piece (16), every fan-shaped sealed piece is equipped with two lubricated water holes and accesss to the facade of sealed piece and the contact of stagnant water axle sleeve in the one side of pressing close to sealed support I (14).
7. The packing type and following type combined hydraulic generator working sealing device according to claim 1, wherein: the water stopping shaft sleeve (6), the sealing support (5), the sealing support I (14) and the sealing support II (17) are all made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021415179.4U CN213064613U (en) | 2020-07-17 | 2020-07-17 | Packing type and follow-up type combined hydraulic generator working sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021415179.4U CN213064613U (en) | 2020-07-17 | 2020-07-17 | Packing type and follow-up type combined hydraulic generator working sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213064613U true CN213064613U (en) | 2021-04-27 |
Family
ID=75574536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021415179.4U Active CN213064613U (en) | 2020-07-17 | 2020-07-17 | Packing type and follow-up type combined hydraulic generator working sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213064613U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418005A (en) * | 2021-06-10 | 2021-09-21 | 湖南崇德科技股份有限公司 | High-speed shaft sealing structure |
-
2020
- 2020-07-17 CN CN202021415179.4U patent/CN213064613U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418005A (en) * | 2021-06-10 | 2021-09-21 | 湖南崇德科技股份有限公司 | High-speed shaft sealing structure |
| CN113418005B (en) * | 2021-06-10 | 2023-12-22 | 湖南崇德科技股份有限公司 | High-speed shaft sealing structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213064613U (en) | Packing type and follow-up type combined hydraulic generator working sealing device | |
| CN201258816Y (en) | Principal axis sealing device for end-face water pressure type hydroturbine | |
| CN208397308U (en) | A kind of high-speed dry operating mechanically-sealing apparatus | |
| CN211009581U (en) | Novel sealing device for main bearing of dry-method ball mill | |
| CN217328512U (en) | Improved shaft end sealing structure and wear-resisting ring thereof | |
| CN208649788U (en) | A kind of modified hydraulic seal suction couch roll | |
| CN216429929U (en) | Combined floating packing sealing structure of melt discharging gear pump | |
| CN112303275B (en) | Metal sealing ball valve | |
| CN113187817A (en) | Dynamic and static pressure dual-function bearing device of stern bearing and adjusting method | |
| CN2163883Y (en) | Pressure feedback balanced self-oiling piston for reciprocating pump | |
| CN105937381A (en) | Supporting, sealing and lubricating structure of follow-up type well mouth sealer | |
| CN111911406A (en) | High-pressure grouting pump hydraulic end with linear bearing | |
| CN216895765U (en) | Sectional combination formula main shaft seal structure | |
| CN220769613U (en) | Shaft sleeve sealing structure in guide vane of water pump turbine | |
| CN202597215U (en) | Mechanical seal for coolant drain tank pump | |
| CN111089000A (en) | Self-adaptive high-durability floating sealing structure suitable for extreme conditions | |
| CN212337609U (en) | High-pressure grouting pump hydraulic end with linear bearing | |
| CN218598639U (en) | Joint bearing retainer with self-lubricating function | |
| CN111022488A (en) | Wear-resistant firm type rotating bearing for mounting rotating base | |
| CN213332056U (en) | Linear bearing for high-pressure grouting pump | |
| CN215980119U (en) | Catalyst returning pump | |
| CN218954023U (en) | Shaft seal structure with on-line overhaul function | |
| CN209228705U (en) | A kind of new engine water pump cover | |
| CN219264918U (en) | Rotary kiln riding wheel double-layer oil seal structure | |
| CN216975105U (en) | Self-lubricating bearing for hydroelectric generating set |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |