CN212296506U - Partition board assembled end steam seal structure - Google Patents
Partition board assembled end steam seal structure Download PDFInfo
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- CN212296506U CN212296506U CN202021774406.2U CN202021774406U CN212296506U CN 212296506 U CN212296506 U CN 212296506U CN 202021774406 U CN202021774406 U CN 202021774406U CN 212296506 U CN212296506 U CN 212296506U
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Abstract
The utility model relates to a baffle assembled end steam seal structure, which comprises an impeller and a baffle adjacent to the impeller; a gap is formed between the baffle plate and the impeller; the impeller is provided with the arch on the wall relative to the baffle, the baffle is provided with the mounting groove on the wall relative to the impeller, the arch sets up in the mounting groove. Dividing the gap into a first axial gap, a radial gap and a second axial gap; a gland ring is fixedly arranged in the radial gap; the gland sealing ring cuts off the radial gap; the air leakage flow needs to sequentially pass through the first axial gap, the radial gap and the second axial gap and flows out of the main air flow channel, after the air flow turns for several times, the kinetic energy is reduced, and the air leakage quantity is reduced; and the gland sealing ring is arranged in the radial gap, so that the problems of sealing failure, abrasion and the like caused by changing the gland sealing gap due to the axial displacement of the rotor of the unit are completely avoided, and the reliability of the gland sealing ring is greatly improved.
Description
Technical Field
The utility model relates to a technical field of steam turbine vapor seal especially relates to a baffle assembled tip vapor seal structure.
Background
The partition plate steam seal in the steam turbine is mainly used for reducing steam leakage at the position of a dynamic gap and a static gap in the steam turbine, and more steam completes acting through a flow passage formed by the static blade grid and the movable blade grid so as to improve the running efficiency of a unit.
The leakage steam quantity can be reduced by reducing the sealing clearance and increasing the flow resistance of the leakage steam, but the undersized sealing clearance needs to improve the design requirements of unit vibration and axial vibration, and simultaneously, the risk of the increase of the leakage steam quantity caused by the abrasion of the sealing surface is also increased.
Therefore, the company designs a partition plate assembly type end steam seal, and the steam seal ring reduces the steam leakage amount of the steam seal by changing the flow direction of the leaked steam under the condition that the steam seal gap is not changed, and simultaneously, the reliability and the service life of the steam seal ring are also improved. Through the special structure of the end part, the flowing state of the steam leakage airflow is improved, and the interference of the steam leakage airflow to the main flow is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the technical problem who exists among the prior art, provide a baffle assembled tip vapor seal structure, can reduce vapor leakage of vapor seal, increase the reliability and the life of gland sealing ring to improve the operating efficiency and the economic nature of unit.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a partition board assembly type end steam seal structure comprises an impeller and a partition board adjacent to the impeller; the impeller is positioned in front of the baffle plate along the flowing direction of the main air flow; the primary air flow passes through the baffle and the impeller via a primary air flow path; a gap is formed between the baffle plate and the impeller, and the leakage air flows out of the main air flow channel through the gap;
the impeller is characterized in that a bulge is arranged on the wall surface of the impeller, which is opposite to the partition plate, a mounting groove is arranged on the wall surface of the partition plate, which is opposite to the impeller, and the bulge is arranged in the mounting groove and divides the gap into a first axial gap, a radial gap and a second axial gap;
a gland ring is fixedly arranged in the radial gap; the gland ring blocks the radial gap.
The utility model has the advantages that: the air leakage flow needs to sequentially pass through the first axial gap, the radial gap and the second axial gap and flows out of the main air flow channel, after the air flow turns for several times, the kinetic energy is reduced, and the air leakage quantity is reduced; and the gland sealing ring is arranged in the radial gap, so that the problems of sealing failure, abrasion and the like caused by changing the gland sealing gap due to the axial displacement of the rotor of the unit are completely avoided, and the reliability of the gland sealing ring is greatly improved.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the gland sealing ring is a semicircular elastic plate, and the thickness direction of the gland sealing ring is parallel to the flow direction of the main airflow;
an annular groove is formed in the inner wall of the mounting groove; the outer end of the gland sealing ring is bent 180 degrees towards one side of the gland sealing ring to form a bent part, and the bent part is inserted into the annular groove in an interference manner;
the inner end of the gland sealing ring is abutted against the side wall of the bulge.
The beneficial effect of adopting the further scheme is that: the steam seal ring is arranged on the partition plate and is a detachable part, and the steam seal ring and the rotating impeller form a sealing surface; after the steam seal ring is worn to cause seal failure, only a new steam seal ring needs to be replaced independently, the impeller and the partition plate do not need to be repaired, and the maintenance cost is reduced to a greater extent.
Further, the bottom of the annular groove is arc-shaped and matched with the outer wall of the bending part.
Further, the metal wire is filled in the bent part in an interference manner.
Further, the inner side of the gland ring is inclined toward a side opposite to the impeller.
Further, the root of the bulge, which is opposite to the side wall of the radial gap, is provided with an arc-shaped chamfer.
The beneficial effect of adopting the further scheme is that: the arc surface structure increases the flow resistance generated by the impact of the airflow
Furthermore, another lateral wall that the arch is relative radial gap is special curved surface, special curved surface is formed by the curve around the main shaft center rotation, the curve is formed by the mutual tangent pitch arc concatenation of the different curvatures of multistage.
The beneficial effect of adopting the further scheme is that: the special curved surface structure avoids the processing difficulty caused by adopting a high-order spline curve, can avoid the phenomena of uneven flow, vortex and the like caused by the sudden enlargement of the cross section of a flow channel after the steam seal of the air flow, improves the flow state of the air flow with steam leakage, and reduces the interference of the air flow to the next-stage main flow.
Drawings
Fig. 1 is a schematic structural view of a partition assembly type end steam seal structure of the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is a view of the present invention;
fig. 4 is a cross-sectional view at B-B in fig. 3.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the sealing structure comprises a partition plate, 11, a mounting groove, 12, an annular groove, 2, an impeller, 21, a protrusion, 22, a chamfer, 23, a special curved surface, 3, a gap, 31, a first axial gap, 32, a radial gap, 33, a second axial gap, 4, a gland sealing ring, 41, a bending part, 5, a metal wire, 6, a main air flow channel, 7, a main air flow, 8 and a leakage air flow.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1 and 2, a diaphragm-assembled end steam seal structure includes an impeller 2 and a diaphragm 1 adjacent thereto. The impeller 2 is located forward of the baffle 1 in the direction of flow of the primary air flow 7. The primary air flow 7 passes through the baffle 1 and the impeller 2 via the primary air flow passage 6. A gap 3 is arranged between the clapboard 1 and the impeller 2, and the leakage air flow 8 flows out of the main air flow channel 6 through the gap 3.
In order to reduce the air leakage flow 8 and enable more steam to complete work through the main air flow channel 6 so as to improve the operation efficiency of the unit, the wall surface of the impeller 2 opposite to the partition plate 1 is provided with a bulge 21, and the wall surface of the partition plate 1 opposite to the impeller 2 is provided with a mounting groove 11. The protrusion 21 is disposed in the mounting groove 11 to divide the gap 3 into a first axial gap 31, a radial gap 32, and a second axial gap 33. The leakage air flow 8 needs to flow out of the main air flow channel 6 through the first axial gap 31, the radial gap 32 and the second axial gap 33 in sequence, and after the leakage air flow 8 turns for a plurality of times, the kinetic energy is reduced, and the leakage air quantity is reduced.
The root of the protrusion 21 with respect to the sidewall of the radial gap 32 is provided with an arc-shaped chamfer 22, and the arc surface structure increases the flow resistance generated by the blow-by gas flow 8 striking the protrusion 21. The other side wall of the protrusion 21 opposite to the radial gap 32 is a special curved surface 23, the special curved surface 23 is formed by rotating a curve around the center of the main shaft, and the curve is formed by splicing a plurality of sections of arcs which have different curvatures and are tangent to each other. The structure of the special curved surface 23 avoids the processing difficulty caused by adopting a high-order spline curve, can avoid the phenomena of uneven flow, vortex and the like caused by the sudden enlargement of the cross section of the flow channel after the steam seal of the air leakage flow 8, improves the flow state of the air leakage flow 8, and reduces the interference of the air leakage flow 8 on the next-stage main air flow 7.
A gland ring 4 is fixedly arranged in the radial gap 32, and the gland ring 4 blocks the radial gap 32. Because the gland sealing ring 4 is arranged in the radial gap 32, when the impeller 2 axially moves, the gland sealing ring 4 can still separate the radial gap 32, thereby completely avoiding the problems of sealing failure, abrasion and the like caused by changing the gland sealing gap due to the axial displacement of the rotor of the unit, and greatly improving the reliability of the gland sealing ring.
As shown in fig. 3 and 4, the gland ring 4 is a semicircular elastic plate, and the thickness direction of the gland ring 4 is parallel to the flow direction of the main airflow 7. An annular groove 12 is formed on the inner wall of the mounting groove 11. The outer end of the gland sealing ring 4 is bent 180 degrees to one side thereof to form a bent portion 41, and the bent portion 41 is inserted into the annular groove 12 with interference. The inner end of the gland ring 4 abuts against the side wall of the projection 21. The gland sealing ring 4 is arranged on the clapboard 1 and is a detachable part, thereby being convenient for replacement. The gland sealing ring 4 and the rotating impeller 2 form a sealing surface. After the steam seal ring 4 is worn to cause seal failure, only the new steam seal ring 4 needs to be replaced independently, the impeller 2 and the baffle plate 1 do not need to be repaired, and the maintenance cost is reduced to a greater extent. The gland sealing ring 4 has elasticity, so that hard contact between the gland sealing ring 4 and the impeller can be avoided, abrasion of the gland sealing ring 4 is slowed down, and the service life of the gland sealing ring 4 is prolonged.
The bottom of the annular groove 12 is arc-shaped and matches with the outer wall of the bent portion 41. The bent portion 41 is filled with the wire 5 by interference. The metal wire 5 presses and fixes the bending part 41 in the annular groove 12, so that the connection between the gland sealing ring 4 and the partition board 1 is firmer, and the disassembly of the gland sealing ring 4 is not influenced.
The inner side of the gland ring 4 is inclined toward the side opposite to the impeller 2. When the leakage air flow 8 hits the gland sealing ring 4, the protrusion 21 can abut against the gland sealing ring 4 to prevent the gland sealing ring 4 from deforming, so that the leakage air flow 8 passes through the gland sealing ring 4.
The embodiment reduces the steam leakage amount of the steam seal by changing the flow direction of the leakage air flow 8, and simultaneously increases the reliability and the service life of the steam seal ring 4. Through the structure of the special curved surface 23, the flowing state of the leakage air flow 8 is improved, and the interference of the leakage air flow 8 on the next-stage main air flow 7 is reduced.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. A partition board assembly type end steam seal structure comprises an impeller and a partition board adjacent to the impeller; the impeller is positioned in front of the baffle plate along the flowing direction of the main air flow; the primary air flow passes through the baffle and the impeller via a primary air flow path; a gap is formed between the baffle plate and the impeller, and the leakage air flows out of the main air flow channel through the gap;
the impeller is characterized in that a bulge is arranged on the wall surface of the impeller, which is opposite to the partition plate, a mounting groove is arranged on the wall surface of the partition plate, which is opposite to the impeller, and the bulge is arranged in the mounting groove and divides the gap into a first axial gap, a radial gap and a second axial gap;
a gland ring is fixedly arranged in the radial gap; the gland ring blocks the radial gap.
2. The bulkhead assembled end gland seal according to claim 1, wherein the gland ring is a semi-circular ring of elastic plate, and a thickness direction of the gland ring is parallel to a flow direction of the primary air flow;
an annular groove is formed in the inner wall of the mounting groove; the outer end of the gland sealing ring is bent 180 degrees towards one side of the gland sealing ring to form a bent part, and the bent part is inserted into the annular groove in an interference manner;
the inner end of the gland sealing ring is abutted against the side wall of the bulge.
3. The bulkhead assembled end gland seal of claim 2, wherein the bottom of the annular groove is radiused and mates with the outer wall of the bend.
4. The bulkhead assembled end gland seal of claim 2, wherein said kink is filled with wire with interference.
5. The bulkhead assembled end gland seal according to claim 2, wherein an inner side of the gland ring is inclined toward a side opposite to the impeller.
6. The bulkhead assembled end gland seal of claim 1, wherein said projection is chamfered in a circular arc relative to a root of a sidewall of said radial gap.
7. The bulkhead assembled end gland seal of claim 1, wherein the other side wall of the protrusion opposite to the radial gap is a special curved surface formed by a curve rotating around the center of the main shaft, and the curve is formed by splicing a plurality of sections of arcs with different curvatures and tangency to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021774406.2U CN212296506U (en) | 2020-08-24 | 2020-08-24 | Partition board assembled end steam seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021774406.2U CN212296506U (en) | 2020-08-24 | 2020-08-24 | Partition board assembled end steam seal structure |
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| Publication Number | Publication Date |
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| CN212296506U true CN212296506U (en) | 2021-01-05 |
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| CN202021774406.2U Active CN212296506U (en) | 2020-08-24 | 2020-08-24 | Partition board assembled end steam seal structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111911243A (en) * | 2020-08-24 | 2020-11-10 | 中国长江动力集团有限公司 | Partition board assembled end steam seal structure |
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2020
- 2020-08-24 CN CN202021774406.2U patent/CN212296506U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111911243A (en) * | 2020-08-24 | 2020-11-10 | 中国长江动力集团有限公司 | Partition board assembled end steam seal structure |
| CN111911243B (en) * | 2020-08-24 | 2024-05-28 | 中国长江动力集团有限公司 | Baffle assembled tip vapor seal structure |
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