CN204238986U - A kind of steam turbine steam seal ring - Google Patents
A kind of steam turbine steam seal ring Download PDFInfo
- Publication number
- CN204238986U CN204238986U CN201420444064.6U CN201420444064U CN204238986U CN 204238986 U CN204238986 U CN 204238986U CN 201420444064 U CN201420444064 U CN 201420444064U CN 204238986 U CN204238986 U CN 204238986U
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- seal ring
- segmental arc
- steam seal
- steam
- face
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Abstract
The utility model discloses a kind of steam turbine steam seal ring, described steam seal ring is cut into multiple segmental arc, and the end face of each segmental arc has projection, and each segmental arc engagement contact.Compared to the packing end face that plane coordinates, the end face of the utility model steam seal ring can increase gland leak-off resistance, significantly reduces the Steam loss of packing segmental arc end face junction.
Description
Technical field
The utility model relates to motive power machine equipment manufacturing technology field, and specifically a kind of segmental arc end face adopts serrated face to coordinate the steam turbine steam seal ring of contact.
Background technique
Steam turbine is made up of stator and rotor two-part, because steam turbine is often in the state run up, therefore certain gap must be ensured between sound, the Steam Turbine Vibration caused to prevent impact and rub, but then, due to the existence in gap between sound, can cause gas leakage, cause the decline of turbine efficiency, therefore steam turbine generally adopts the structure such as shaft seal, diaphragm gland, movable vane top packing, both ensure that dynamic and static gaps, and Steam loss can be reduced to a certain extent again.Along with improving constantly of the rotating machinery such as steam turbine, gas turbine performance, sealing place is revealed has become one of key factor affecting turbomachinery performance, and improvement and the development of sealing technique have very large potentiality for raising turbomachinery performance and efficiency.
Large wisp adjusting type steam seal ring according to steam seal ring diameter is divided into 4 segmental arcs, 6 segmental arcs or 8 segmental arcs etc.The processing of current steam seal ring segmental arc generally adopts whole circle to process, and then whole circle packing Linear cut is become 4 segmental arcs, 6 segmental arcs or 8 segmental arcs etc., the total backlash of each segmental arc of general processing request is not more than 0.2mm, and the intersegmental gap of adjacent arcs is not more than 0.05mm.But machining error and in-site installation error often cause whole circle packing expansion total backlash not meet total reload request of steam turbine, if total backlash reaches 0.15mm during assembled in situ, can be solved by field polish packing segmental arc end face, and can not have an impact to packing leak-off flows, if but overall expansion gap is bigger than normal, scene just often can only take this fast mode of end face repair welding to process, because repair welding part does not have gland sealing gear, directly gland-packing leakage be can affect, and then complete machine output power and efficiency had influence on.
Model utility content
The purpose of this utility model is to provide a kind of segmental arc end face and adopts serrated face to coordinate the steam sealing ring of steam turbine of contact, combines the shortcoming existed, reduce packing leak-off flows to overcome plane between existing steam seal ring segmental arc end face.
For achieving the above object, the utility model proposes a kind of steam sealing ring of steam turbine, described steam seal ring is cut into multiple segmental arc, and the end face of each segmental arc has projection, and each segmental arc engagement contact.
Alternatively, described projection for having the projection of regular shape, or has erose projection.
Alternatively, described projection is zigzag fashion.
Alternatively, described sawtooth is 45 ° or 60 ° of isosceles triangles.
Alternatively, the height of described sawtooth is 5-10mm.
Alternatively, the smoothness requirements of sawtooth end face is Ra6.3.
Alternatively, the gap between each segmental arc end face is 0.05mm-0.1mm, and the total backlash of whole circle steam seal ring is no more than 0.6mm.
Alternatively, the number of described segmental arc is 4,6 or 8.
Alternatively, the number of described segmental arc is 6, and the gap between each segmental arc is 0.1mm, and sawtooth angle is 60 °.
The utility model can overcome plane between existing steam seal ring segmental arc end face and combine the shortcoming existed, and increases gland leak-off resistance, significantly reduces the Steam loss of packing segmental arc end face junction.During in-site installation, when steam seal ring overall expansion gap does not meet steam turbine general-assembling requirement, if overall expansion gap is less than normal, then directly can to polish end-tooth, to decrease workload than the end face of whole packing of polishing in prior art, if overall expansion gap is bigger than normal, as long as overall expansion gap is not more than 0.6mm, because packing end face adopts the height serrated face with the effect of resistance vapour, do not need on-the-spot repair welding, can meet total reload request yet.
Accompanying drawing explanation
Fig. 1 is the structural representation that the steam seal ring segmental arc end face of conventional construction adopts plane to coordinate;
Fig. 2 is the structural representation of the steam seal ring segmental arc end face according to the utility model one embodiment.
Embodiment
For making the purpose of this utility model, technological scheme and advantage clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the utility model is further described.
Fig. 1 is the structural representation that the steam seal ring segmental arc end face of conventional construction adopts plane to coordinate, the processing of traditional steam seal ring segmental arc generally adopts whole circle to process, then whole circle packing Linear cut is become the modes such as 4 segmental arcs, 6 segmental arcs or 8 segmental arcs, directly plane is cut between steam seal ring segmental arc, as shown in Figure 1, total backlash between each segmental arc of general processing request is not more than 0.2mm, and the intersegmental gap of adjacent arcs is not more than 0.05mm.
The utility model proposes a kind of steam turbine steam seal ring, same as the prior art, described steam seal ring is cut into multiple segmental arc, is with the difference of prior art, and in the utility model, the end face of each segmental arc of steam seal ring has projection, and each segmental arc engagement contact.
Wherein, described projection can be the projection with regular shape, also can be have erose projection, as long as can ensure can engage between adjacent segmental arc contacts.
Fig. 2 is the structural representation of the steam seal ring segmental arc end face according to the utility model one embodiment, and as shown in Figure 2, in this embodiment, the end face of each segmental arc is serrated face, and namely described projection is zigzag fashion.
Wherein, according to the difference of steam seal ring segmental arc end face axial width, the shape of unit sawtooth cross section can be 45 ° or 60 ° of isosceles triangles, and the height h of sawtooth can be designed to 5-10mm according to actual conditions; The smoothness requirements of serrated face is Ra6.3.
Wherein, according to the size of steam seal ring diameter, described steam seal ring is divided into 4 segmental arcs, 6 segmental arcs or 8 segmental arcs.
Wherein, the bonding gap of each segmental arc serrated face of steam seal ring requires, for 0.05mm-0.1mm, suitably can adjust, but the total backlash of whole circle steam seal ring to be no more than 0.6mm according to actual conditions.
During in-site installation, when steam seal ring overall expansion gap does not meet steam turbine general-assembling requirement, if overall expansion gap is less than normal, then directly can to polish end-tooth, to decrease workload than the end face of whole packing of polishing in prior art, if overall expansion gap is bigger than normal, as long as overall expansion gap is not more than 0.6mm, because packing end face adopts the height serrated face with the effect of resistance vapour, do not need on-the-spot repair welding, can meet total reload request yet.
In the utility model one embodiment, whole for steam seal ring circle is processed as 6 segmental arcs, the processing dimension of each segmental arc seam crossing is as follows:
Sawtooth height h=8.8mm, the gap a=0.1mm between each segmental arc, sawtooth angle α=60 °, axial distance b=15.25mm, c=30.5mm, d=45.75mm, as shown in Figure 2.
For this embodiment, when installing at the scene, can ensure that packing overall expansion gap is no more than 0.6mm.
Above-described specific embodiment; the purpose of this utility model, technological scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (9)
1. a steam turbine steam seal ring, described steam seal ring is cut into multiple segmental arc, it is characterized in that, the end face of each segmental arc has projection, and each segmental arc engagement contact.
2. steam seal ring according to claim 1, is characterized in that, described projection for having the projection of regular shape, or has erose projection.
3. steam seal ring according to claim 1, is characterized in that, described projection is zigzag fashion.
4. steam seal ring according to claim 3, is characterized in that, described sawtooth is 45 ° or 60 ° of isosceles triangles.
5. steam seal ring according to claim 3, is characterized in that, the height of described sawtooth is 5-10mm.
6. steam seal ring according to claim 3, is characterized in that, the smoothness requirements of sawtooth end face is Ra6.3.
7. steam seal ring according to claim 1, is characterized in that, the gap between each segmental arc end face is 0.05mm-0.1mm, and the total backlash of whole circle steam seal ring is no more than 0.6mm.
8. steam seal ring according to claim 1, is characterized in that, the number of described segmental arc is 4,6 or 8.
9. steam seal ring according to claim 3, is characterized in that, the number of described segmental arc is 6, and the gap between each segmental arc is 0.1mm, and sawtooth angle is 60 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420444064.6U CN204238986U (en) | 2014-08-07 | 2014-08-07 | A kind of steam turbine steam seal ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420444064.6U CN204238986U (en) | 2014-08-07 | 2014-08-07 | A kind of steam turbine steam seal ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204238986U true CN204238986U (en) | 2015-04-01 |
Family
ID=52768499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420444064.6U Active CN204238986U (en) | 2014-08-07 | 2014-08-07 | A kind of steam turbine steam seal ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204238986U (en) |
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2014
- 2014-08-07 CN CN201420444064.6U patent/CN204238986U/en active Active
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |