CN211950602U - Radial cog seal for turbine shaft - Google Patents
Radial cog seal for turbine shaft Download PDFInfo
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- CN211950602U CN211950602U CN202020623279.XU CN202020623279U CN211950602U CN 211950602 U CN211950602 U CN 211950602U CN 202020623279 U CN202020623279 U CN 202020623279U CN 211950602 U CN211950602 U CN 211950602U
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Abstract
A turbine shaft radial cog seal comprises a shaft sleeve and a seal body; the shaft sleeve is provided with a radial boss at the side of the bearing box, the radial boss is far away from the side of the bearing box, sealing teeth are machined on the outer circle surface of the shaft sleeve, the sealing body is fixed on the gland through bolts, a radial recovery sleeve is sleeved on the outer circle of the sealing body, and when the sealing body and the radial recovery sleeve are of a split structure, the sealing teeth on the outer circle of the shaft sleeve are embedded into the inner hole surface of the sealing body; when the sealing body and the radial recovery sleeve are of an integral structure, the tooth tops of the sealing teeth on the outer circle of the shaft sleeve are tightly attached to the inner hole surface of the sealing body, the outer circle sleeves of the sealing body and the radial recovery sleeve are provided with positioning rings, the positioning rings are fixed on the sealing body through screws, and the shaft sleeve is sleeved on the main shaft of the equipment. Through establish sealed tooth in the axial of axle sleeve and radial, change axial and radial combined seal into by axial seal, change the air current direction, prevent that gas from directly spouting into the bearing box after leaking along the axle sleeve axial, cause the atomizing of lubricating oil and damage the bearing.
Description
Technical Field
The utility model belongs to the technical field of it is sealed, in particular to turbine axle radial cog is sealed.
Background
In the conventional sealing technology, the sealing using gas as medium, such as the common sealing of steam turbine, gas turbine, etc., has three structural forms:
1. gap sealing: the sealing is that the two ends of the fan are provided with a comb seal or a carbon ring seal and the like, the axial single gap seal is realized, an isolation gas inflation inlet is arranged at the side close to the impeller, and isolation gas is added in the use process of the fan to prevent gas in the fan from leaking. This kind of sealed common structure for in the vapor seal, the low price, it is simple to maintain, nevertheless can appear often when the change of fan internal gas pressure that the separation gas not only can't separate gaseous leakage, it is more serious to fall over to make gaseous leakage, the gaseous bearing box that closes on is directly spouted in to the gas of revealing, cause the lubricating oil atomizing in the bearing box, the bearing damages, still there is the problem that the too big polluted environment of sealing medium leakage volume when carrying poisonous and harmful medium, ordinary gap seal is big because of equipment vibration, the sealing material restriction can't be done very little to the clearance, it is very big to cause gaseous leakage volume, still can reduce equipment efficiency in the polluted environment.
2. Dry gas sealing: the manufacturing cost is high, an auxiliary system needs to be installed, a nitrogen gas source on site cannot be cut off, once the gas source is cut off and supplied to a dry gas sealing friction pair, the dry gas sealing friction pair can be damaged quickly due to dry grinding, and the sealing is only used for sealing inflammable and explosive gases due to too high manufacturing cost and daily use cost.
3. Mechanical sealing: the Plan54 system needs to be made, and the auxiliary system is high in manufacturing cost and complex in maintenance. Once the system breaks down, the mechanical seal can be damaged because of insufficient supply of lubricating fluid in the seal cavity, and due to structural limitation, the mechanical seal can not be applied to high-speed and large-shaft-diameter equipment, and with the development of modern technology, the specification and size of equipment such as a gas turbine, a steam turbine, a centrifugal compressor and the like are larger and larger, the rotating speed is higher and higher, and the seal is rarely used except for some small-sized equipment.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that prior art exists, the utility model provides a turbine shaft is sealed to be cog radially, and this turbine shaft is sealed to be adopted newest sealing material and scrapes forming process from the friction, can obtain the minimum clearance under the actual operating condition of equipment under the prerequisite that does not harm the axle sleeve. So as to achieve the purposes of reducing the sealing clearance and reducing the leakage amount. The sealing structure is simple and easy to maintain, leakage gas is prevented from being directly sprayed into the bearing box by changing the gas leakage direction and a method for recovering the leaked gas, and lubricating oil in the bearing box is prevented from being atomized to damage a bearing, so that the equipment failure rate is reduced.
In order to realize the purpose, the technical scheme of the utility model is that:
a turbine shaft radial cog seal comprises a shaft sleeve, a positioning ring, a radial recovery sleeve, a screw, a seal body and a gland; the shaft sleeve is provided with a radial boss at the side of the bearing box, the radial boss is far away from the side of the bearing box and the outer circular surface of the shaft sleeve are both processed with sealing teeth, the sealing body is fixed on the gland by bolts, the radial recovery sleeve is sleeved on the outer circle of the sealing body, the radial recovery sleeve is positioned between the radial boss of the shaft sleeve and the sealing body, the radial recovery sleeve and the sealing body are both sleeved on the shaft sleeve, the outer circles of the sealing body and the radial recovery sleeve are sleeved with positioning rings, the positioning rings are fixed on the metal body of the sealing body by screws, kidney-shaped holes are processed on the positioning rings, screws are arranged in the kidney-shaped holes, the bottom ends of the screws are screwed on the outer circle of the radial recovery sleeve, the axial positions of the radial recovery sleeve can be adjusted by the screws in the kidney-shaped holes, and when the radial recovery sleeve and the radial boss of the shaft sleeve are, leakage is reduced, and the shaft sleeve is sleeved on the main shaft of the equipment.
The sealing body and the radial recovery sleeve are of a split structure or an integral structure, when the sealing body and the radial recovery sleeve are of the split structure, the sealing teeth on the outer circle of the shaft sleeve are embedded into the inner hole surface of the sealing body, so that the gap between the shaft sleeve and the sealing body is zero, and the gas leakage amount is minimum; when the sealing body and the radial recovery sleeve are of an integral structure, the tooth top of the sealing tooth on the excircle of the shaft sleeve is tightly attached to the inner hole surface of the sealing body.
The sealing body comprises metal body and inside lining, and metal body and inside lining are covered by the bolt fastening, the inside lining is the annular body that F500, PEEK or polytetrafluoroethylene made or does the abradable coating of metal body internal surface spraying, the metal body excircle is the echelonment, and the partial cover of minor diameter of metal body is equipped with radially retrieves the cover, and radially retrieves the cover and can slide along the metal body excircle of sealing body in the axial, the inside lining hole is made according to zero clearance or embedded cooperation with the sealed tooth excircle of axle sleeve, and the hole and the axle sleeve self-friction shaping of inside lining after installation operation a period can obtain the minimum clearance under the actual operating condition of equipment under the prerequisite of not damaging the axle sleeve.
When the sealing body is of a split structure, the aperture of an inner hole of the lining of the sealing body is larger than or equal to the diameter of a tooth root circle of the shaft sleeve sealing tooth and smaller than or equal to the diameter of an tooth top circle of the shaft sleeve sealing tooth; when the sealing body is of an integral structure, the diameter of the inner hole of the lining of the sealing body is equal to the diameter of the addendum circle of the sealing tooth of the shaft sleeve.
The end face of one side, close to the radial boss of the shaft sleeve, of the radial recovery sleeve is provided with a radial gas collecting groove, gas collecting holes are uniformly formed in the circumferential direction of the outer circle face of the radial recovery sleeve and are communicated with the radial gas collecting groove, the radial gas collecting groove collects gas leaked out of sealing teeth at the radial boss of the shaft sleeve and sealing teeth between the radial boss and the outer circle of the shaft sleeve to the gas collecting holes, a groove is formed between an outlet of the gas collecting holes and the outer circle of the radial recovery sleeve, and the outlets of the gas collecting holes are connected into a whole through the groove.
The positioning ring is provided with vent holes which are communicated with the grooves on the radial recovery sleeve, leaked gas collected by each gas collecting hole uniformly flows into the grooves and then is discharged to the atmosphere or a safety zone from the vent holes, zero leakage is guaranteed, and the lubricating oil in the bearing box is prevented from being atomized and the bearing is prevented from being damaged due to the fact that the leaked gas is directly sprayed into the bearing box.
And sealing rings are arranged between the sealing body and the radial recovery sleeve, between the radial recovery sleeve and the positioning ring and between the sealing body and the gland so as to prevent sealing gas from leaking between the sealing body and the radial recovery sleeve.
And the sealing body and the positioning ring are provided with isolating air holes, and the isolating air holes are communicated with isolating air to prevent the air in the equipment from leaking.
The positioning ring is provided with the boss, so that the positioning ring can be conveniently detached.
The utility model has the advantages that:
(1) the shaft sleeve is provided with the radial boss, the side face of the radial boss is provided with the sealing teeth, the axial sealing is changed into axial and radial combined sealing, the airflow direction is changed, and gas is prevented from being directly sprayed into the bearing box after leaking along the axial direction of the shaft sleeve, so that the lubricating oil in the bearing box is atomized, and the bearing is damaged.
(2) Establish radial recovery cover between sealed body and the radial boss of axle sleeve, radial recovery cover is established radial gas collecting tank and is collected the gas pocket, still can collect revealing gas when sealed tooth blocks that gas reveals, can guarantee that even the inboard is sealed has a small amount of medium to reveal equipment whole leakage amount still for zero.
(3) The outer locating ring of the radial recovery sleeve can slide along the outer circle of the sealing body, the axial position of the screw in the waist-shaped hole of the radial recovery sleeve can be adjusted, the gap between the radial recovery sleeve and the radial boss of the shaft sleeve can be reduced due to the fact that the distance between the radial recovery sleeve and the boss is reduced after the abrasion gap is enlarged, leakage is reduced, the seal is replaced when overhaul is carried out, the service life of the seal is prolonged, and the cost and time for maintaining equipment are reduced.
(4) And the excircle sealing teeth of the shaft sleeve are embedded into the lining of the sealing body, so that the gap between the two sealing pieces is approximately zero, and the gas leakage amount reaches the minimum.
(5) Reduce the sealed clearance and be the best mode that reduces the medium and let out leakage quantity, for guaranteeing equipment operation security under minimum clearance condition, need sealed functional layer to possess excellent self-lubricity and stable grindability in order to avoid the loss of sealed tooth prong, in addition because sealing medium is various, the service temperature span is big, needs the functional layer material to possess high chemical stability, broad usable temperature range and excellent ageing-resistant performance, for this the utility model discloses select present most advanced material F500 for sealed body inside lining, guaranteed that sealed above-mentioned each item index reaches the optimum.
(6) The positioning ring is provided with a boss as a stress point for detaching the positioning ring, and the positioning ring can be detached by pulling the boss when detaching the seal, so that the aim of convenient installation and detachment is achieved.
Drawings
FIG. 1 is a schematic view of a turbine shaft radial cog sealing body of the present invention in a split configuration;
FIG. 2 is a schematic cross-sectional view of a turbine shaft radial cog seal of the present invention at C-C;
FIG. 3 is a schematic view of a turbine shaft radial cog seal B-direction kidney-shaped hole of the present invention;
FIG. 4 is a schematic view of a turbine shaft radial cog sealing body of the present invention in an integral configuration;
1. a shaft sleeve; 2. a seal ring; 3. a positioning ring; 31. an exhaust hole; 32. a waist-shaped hole; 4. a radial recovery sleeve; 41. a radial gas collecting tank; 42. a gas collection hole; 5. a screw; 6. a seal body; 7. a gland; 8. isolating the air holes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1 to 3, a turbine shaft radial cog seal comprises a shaft sleeve 1, a positioning ring 3, a radial recovery sleeve 4, a screw 5, a seal body 6 and a gland 7; the shaft sleeve 1 is processed with a radial boss at the side of the bearing box, the end face of the radial boss far away from the side of the bearing box and the outer circular face of the shaft sleeve 1 are processed with sealing teeth, the sealing body 6 is fixed on a gland 7 by bolts, the radial recovery sleeve 4 is sleeved on the outer circular face of the sealing body 6, the radial recovery sleeve 4 is positioned between the radial boss of the shaft sleeve 1 and the sealing body 6, the sealing body 6 is of a split structure consisting of two semicircles and consists of a metal body and a lining, the lining is an annular body made of F500, PEEK and polytetrafluoroethylene, the metal body and the lining are coaxially sleeved together and are fixed on the gland 7 by bolts, a dovetail groove on the inner circular face of the metal body is matched with a dovetail-shaped bulge formed on the outer circular face of the lining, the outer circular face of the metal body is in a ladder shape, an inner hole of the lining is manufactured according to embedded matching, the clearance between the shaft sleeve 1 and the two sealing elements of the lining is approximate to zero, the gas leakage amount reaches the minimum, and the diameter of the inner hole of the lining of the sealing body 6 is equal to the diameter of the root circle of the sealing teeth of the shaft sleeve 1; the end face of the radial recovery sleeve 4 close to one side of the radial boss of the shaft sleeve 1 is provided with a radial gas collecting groove 41, the circumferential direction of the outer circular surface of the radial recovery sleeve 4 is uniformly provided with gas collecting holes 42, the gas collecting holes 42 are communicated with the radial gas collecting groove 41, the radial gas collecting groove 41 collects gas leaked from sealing teeth at the radial boss of the shaft sleeve 1 and sealing teeth at the outer circle of the shaft sleeve 1 to the gas collecting holes 42, an annular groove is processed between the outlet of the gas collecting holes 42 and the outer circle of the radial recovery sleeve 4, the groove connects the outlets of the plurality of gas collecting holes 42 into a whole, the radial recovery sleeve 4 is sleeved outside the metal body of the sealing body 6 and can slide along the outer circle of the metal body of the sealing body 6 in the axial direction, the outer circles of the sealing body 6 and the radial recovery sleeve 4 are sleeved with a positioning ring 3, the positioning ring 3 is fixed on the metal body, the vent holes 31 are communicated with the grooves on the radial recovery sleeve 4, the leaked gas collected by each gas collecting hole 42 uniformly flows into the grooves and then is discharged to the atmosphere or a safety zone from the vent holes 31, zero leakage is ensured, the lubricating oil in the bearing box is prevented from being atomized and the bearing is prevented from being damaged due to the fact that the leaked gas is directly sprayed into the bearing box, the positioning ring 3 is provided with the kidney-shaped hole 32, the screw 5 is arranged in the kidney-shaped hole 32, the bottom end of the screw 5 is screwed on the excircle of the radial recovery sleeve 4, the axial position of the radial recovery sleeve 4 can be adjusted by the screw 5 in the waist-shaped hole 32, the sealing body 6 is fixed on the gland 7 by a bolt, after the abrasion gap between the radial recovery sleeve 4 and the radial boss of the shaft sleeve 1 is enlarged, the distance between the radial recovery sleeve 4 and the radial boss of the shaft sleeve 1 can be adjusted by the screw 5 to reduce the gap, leakage is reduced, and the shaft sleeve 1 is sleeved on the main shaft of the equipment.
And sealing rings 2 are arranged between the sealing body 6 and the radial recovery sleeve 4, between the radial recovery sleeve 4 and the positioning ring 3 and between the sealing body 6 and the gland 7 so as to prevent sealing gas from leaking between the sealing body and the positioning ring.
And the sealing body 6 and the positioning ring 3 are provided with isolating air holes 8, and the isolating air holes 8 are communicated with isolating air to block air leakage in the equipment.
The positioning ring 3 is provided with a boss, so that the positioning ring 3 can be conveniently detached.
A process for installing a turbine shaft radial cog seal:
the gland 7 is arranged in the sealing cavity and positioned by the spigot; sleeving a shaft sleeve 1 on a main shaft of equipment, sleeving two sealing bodies 6 on the excircle sealing teeth of the shaft sleeve 1, closing the two sealing bodies 6 by bolts, starting the equipment, rotating the main shaft to scrape the lining of the sealing body 6, and gradually tightening the closing bolts of the two sealing bodies 6 until the upper and lower sealing bodies are completely closed, wherein the inner hole of the sealing body 6 forms a tooth-shaped groove completely consistent with the sealing teeth on the shaft sleeve 1, so that the minimum gap between the upper and lower sealing bodies is ensured; fixing a sealing body 6 on a gland 7 by using bolts, installing a sealing ring 2, sleeving a split type radial recovery sleeve 4, installing a rubber ring, sleeving a positioning ring 3 on the outer circle of the radial recovery sleeve 4 and the sealing body 6 from the radial boss side of a shaft sleeve 1, tightly hooping the radial recovery sleeve 4 on the sealing body 6 into a whole, installing a positioning screw 5, and fixing the positioning ring 3 on the sealing body 6.
Example 2
As shown in fig. 4, the difference between the embodiment 2 and the embodiment 1 is that the seal body 6 and the radial recovery sleeve 4 are integral, when the seal body 6 is of an integral structure, the tooth crest of the seal tooth on the excircle of the shaft sleeve 1 is tightly attached to the inner hole surface of the seal body 6, the inner hole diameter of the liner of the seal body 6 is equal to the diameter of the tooth crest of the seal tooth of the shaft sleeve 1, and at this time, the inner hole of the liner and the excircle of the seal tooth of the shaft sleeve 1 are manufactured in a zero-clearance fit manner.
A process for installing a turbine shaft radial cog seal:
the gland 7 is arranged in the sealing cavity and positioned by the spigot; fixing a sealing body 6 on a gland 7 by using bolts, installing a sealing ring 2, sleeving an integral radial recovery sleeve 4, installing a rubber ring, sleeving a positioning ring 3 on the radial recovery sleeve 4 and the excircle of the sealing body 6, tightly hooping the radial recovery sleeve 4 on the sealing body 6 to form a whole, installing a positioning screw 5, and fixing the positioning ring 3 on the sealing body 6; the shaft sleeve 1 is sleeved on the main shaft of the equipment.
Claims (9)
1. A turbine shaft radial cog seal is characterized by comprising a shaft sleeve, a positioning ring, a radial recovery sleeve, a screw, a seal body and a gland; the shaft sleeve is provided with a radial boss at the side of the bearing box, the radial boss is far away from the side of the bearing box and the outer circular surface of the shaft sleeve is processed with sealing teeth, the sealing body is fixed on the gland by bolts, the radial recovery sleeve is sleeved on the outer circle of the sealing body, the radial recovery sleeve is positioned between the radial boss of the shaft sleeve and the sealing body, the shaft sleeve passes through the inner holes of the radial recovery sleeve and the sealing body, the outer circles of the sealing body and the radial recovery sleeve are sleeved with positioning rings, the positioning rings are fixed on the metal body of the sealing body by screws, kidney-shaped holes are processed on the positioning rings, screws are installed in the kidney-shaped holes, the bottom ends of the screws are screwed on the outer circle of the radial recovery sleeve, the axial position of the radial recovery sleeve can be adjusted by screws in the kidney-shaped holes, and when the radial recovery sleeve and the radial boss of the shaft sleeve are, the shaft sleeve is sleeved on the main shaft of the equipment.
2. A turbine shaft radial cog seal according to claim 1 characterised in that: the sealing body and the radial recovery sleeve are of a split structure or an integral structure, and when the sealing body and the radial recovery sleeve are of the split structure, the sealing teeth on the outer circle of the shaft sleeve are embedded into the inner hole surface of the sealing body; when the sealing body and the radial recovery sleeve are of an integral structure, the tooth top of the sealing tooth on the excircle of the shaft sleeve is tightly attached to the inner hole surface of the sealing body.
3. A turbine shaft radial cog seal according to claim 2 characterised in that: when the sealing body is of a split structure, the aperture of an inner hole of the lining of the sealing body is larger than or equal to the diameter of a tooth root circle of the shaft sleeve sealing tooth and smaller than or equal to the diameter of an tooth top circle of the shaft sleeve sealing tooth; when the sealing body is of an integral structure, the diameter of the inner hole of the lining of the sealing body is equal to the diameter of the addendum circle of the sealing tooth of the shaft sleeve.
4. A turbine shaft radial cog seal according to claim 1 characterised in that: the sealing body comprises metal body and inside lining, and metal body and inside lining are covered by the bolt fastening, the inside lining is the annular body that F500, PEEK or polytetrafluoroethylene made or does the abradable coating of metal body internal surface spraying, the metal body excircle is the echelonment, and the partial cover of minor diameter of metal body is equipped with radially retrieves the cover, and radially retrieves the cover and can slide along the metal body excircle of sealing body in the axial, the inside lining hole is made according to zero clearance or embedded cooperation with the sealed tooth excircle of axle sleeve, and the hole and the axle sleeve self-friction shaping of inside lining after installation operation a period can obtain the minimum clearance under the actual operating condition of equipment under the prerequisite of not damaging the axle sleeve.
5. A turbine shaft radial cog seal according to claim 1 characterised in that: the end face of one side, close to the radial boss of the shaft sleeve, of the radial recovery sleeve is provided with a radial gas collecting groove, gas collecting holes are uniformly formed in the circumferential direction of the outer circle face of the radial recovery sleeve and are communicated with the radial gas collecting groove, the radial gas collecting groove collects gas leaked out of sealing teeth at the radial boss of the shaft sleeve and sealing teeth between the radial boss and the outer circle of the shaft sleeve to the gas collecting holes, a groove is formed between an outlet of the gas collecting holes and the outer circle of the radial recovery sleeve, and the outlets of the gas collecting holes are connected into a whole through the groove.
6. A turbine shaft radial cog seal according to claim 1 characterised in that: the positioning ring is provided with vent holes which are communicated with the grooves on the radial recovery sleeve, and leaked gas collected by each gas collecting hole uniformly flows into the grooves and then is discharged to the atmosphere or a safety zone from the vent holes.
7. A turbine shaft radial cog seal according to claim 1 characterised in that: sealing rings are arranged between the sealing body and the radial recovery sleeve, between the radial recovery sleeve and the positioning ring and between the sealing body and the gland.
8. A turbine shaft radial cog seal according to claim 1 characterised in that: and the sealing body and the positioning ring are provided with isolating air holes, and the isolating air holes are communicated with isolating air to prevent the air in the equipment from leaking.
9. A turbine shaft radial cog seal according to claim 1 characterised in that: and a boss is arranged on the positioning ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020623279.XU CN211950602U (en) | 2020-04-23 | 2020-04-23 | Radial cog seal for turbine shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020623279.XU CN211950602U (en) | 2020-04-23 | 2020-04-23 | Radial cog seal for turbine shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211950602U true CN211950602U (en) | 2020-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020623279.XU Active CN211950602U (en) | 2020-04-23 | 2020-04-23 | Radial cog seal for turbine shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211950602U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112392725A (en) * | 2020-11-18 | 2021-02-23 | 安徽名杰磁业科技有限公司 | Compressor rotor sealing structure and rotor assembly thereof |
-
2020
- 2020-04-23 CN CN202020623279.XU patent/CN211950602U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112392725A (en) * | 2020-11-18 | 2021-02-23 | 安徽名杰磁业科技有限公司 | Compressor rotor sealing structure and rotor assembly thereof |
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