CN202851974U - Tooth-shaped structure capable of self-restraining effective flow area - Google Patents
Tooth-shaped structure capable of self-restraining effective flow area Download PDFInfo
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- CN202851974U CN202851974U CN 201220497548 CN201220497548U CN202851974U CN 202851974 U CN202851974 U CN 202851974U CN 201220497548 CN201220497548 CN 201220497548 CN 201220497548 U CN201220497548 U CN 201220497548U CN 202851974 U CN202851974 U CN 202851974U
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- tooth
- sealing
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- stator
- flow area
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Abstract
The utility model relates to a tooth-shaped structure capable of self-restraining an effective flow area .The tooth-shaped structure capable of self-restraining the effective flow area comprises a rotor, a stator and sealing teeth, wherein the rotor is arranged below the stator. The number of the sealing teeth is multiple, the sealing teeth are perpendicularly fixed on the stator or the rotor, a gap is reserved between the sealing teeth and a corresponding rotor or stator, and expanding control chambers are arranged among the sealing teeth. Compared with the prior art, the tooth-shaped structure capable of self-restraining the effective flow area has the advantages of being capable of effectively reducing sealing leaking capacity and improving economical efficiency of operation of a unit. In addition, a groove is arranged in the tooth inflow surface of the sealing teeth, close to the tooth end so as to reduce damage on the rotor or the stator when collision or friction exists between the sealing teeth and the rotor or the stator, and thus improve security of operation of the unit.
Description
Technical field
The utility model relates to the sealing tooth-shape structure of technical field of sealing technology, especially relates to a kind of tooth-shape structure from suppressing effective flow area.
Background technique
In steam turbine and turbocompressor, the leakage that suppresses gas working medium by sealing configuration has great importance to Economy and the Security of unit.Growth along with unit capacity and unit thermal parameter, gas density constantly increases in sealing both ends pressure reduction and the sealing, thereby cause leakage flow constantly to increase, Economy descends, therefore, suppress seal leakage and obtained increasing concern, the design of sealing configuration has also been proposed Secretary, be that designed sealing configuration must reduce clearance leakage as far as possible, to guarantee that unit can have higher economic performance.According to described designing requirement to sealing configuration, at present in actual set the most normal employing be exactly labyrinth sealing profile of tooth structure.
Through existing correlation technique literature search being found because seal clearance is long, flow velocity can spread in the gap, thereby cause flow velocity to reduce and pressure raises, this can greatly affect and turn the energy effect in the gap.Therefore, how can be by the reform gap structure so that flow velocity try not to produce diffusion effect, or reach a nearly step by change structure and reduce effective flow area, thereby increase the effect that flow velocity reduces pressure.
Steam turbine and turbocompressor extensively adopt the sealing of mazy type flute profile, establish the ring packing tooth that several are arranged in order at peritrochanteric, form a series of gap and expansion chamber of damming between tooth and the tooth, gas produces throttle effect and reaches and suppress to leak purpose when the gap by tortuous labyrinth.Sew in order to reduce, the crown gap can not be too large, bumps mill in order to prevent that rotor and stator are in operation simultaneously, and the crown gap can not be too small.Leakage flow forms flow at high speed when the backlash, forms strong vortex motion subsequently in tooth rear chamber and makes the almost whole approach exhaustions of kinetic energy that flow, and significantly descends thereby reach pressure.Repeat so step by step said process, gas working medium is reduced to low pressure gradually from high pressure.Because the sealing gland tooth is a lot, the pressure reduction before and after each crown is limited, and the crown gap is again less, and Gas leak flow has obtained restriction.
Along with unit capacity increases, suppress seal leakage and improve unit economy, obtained more and more higher concern.The growth of unit thermal parameter causes gas density increase in sealing both ends pressure reduction and the sealing, thereby causes leakage flow to increase, and Economy descends.Therefore, novel seal is proposed higher requirement, the design sealing must reduce clearance leakage as far as possible, guarantees the higher Economy performance of unit.
The sealing peak fluting that the application proposes is that a kind of mode that relies on the tip clearance runner to increase improves the sinuous flow resistance of backlash fluid to reach the effect that suppresses leakage flow.Change simple in structure feasiblely, safe and reliable, have widely application background at steam turbine high-pressure cylinder, high pressure turbine compressor, especially overcritical and supercritical turbine high pressure section.
The model utility content
The purpose of this utility model is exactly to provide a kind of effective flow area of tip clearance that reduces to seal for the defective that overcomes above-mentioned prior art existence, improves the effluxvelocity in the tip clearance, suppresses the tooth-shape structure that certainly suppresses effective flow area of seal leakage.
The purpose of this utility model can be achieved through the following technical solutions:
From the tooth-shape structure that suppresses effective flow area, this structure comprises rotor, stator and sealing tooth, described rotor is positioned at the below of stator, described sealing tooth is provided with several, vertically be fixed on stator or the rotor, maintain the gap between the rotor that the sealing tooth is corresponding with it or the stator, each seals and is provided with the control chamber of expanding between the tooth.
This structure also includes step, this step be positioned at the sealing tooth under and be vertically fixed on the rotor, described step maintains the gap with sealing between the tooth.
The tooth of described sealing tooth comes stream interface to be provided with a semi-circular recesses near sealing tooth tip end perpendicular to the direction that seals tooth, and the length of groove is 1/2 of transverse tooth thickness, and the degree of depth is 1/4 of transverse tooth thickness.
Described groove along the circumferential direction arranges.
The utility model comes the nearly increment of stream interface that groove is set by the tooth at the sealing tooth, can effectively reduce effective flow area of sealing tip clearance, improves the effluxvelocity of tip clearance, reaches the effect that suppresses seal leakage.
Compared with prior art, the utility model has the advantage of and effectively to reduce the seal leakage amount, improved the Economy of unit operation, in addition, when the tooth of sealing tooth comes the nearly increment of stream interface that groove is set can to reduce sealing tooth and rotor or stator and bump or rub to the damage of rotor or stator, the Security that has improved unit operation.
Description of drawings
Fig. 1 is structural representation of the present utility model among the embodiment 1;
Fig. 2 is the partial enlarged drawing among Fig. 1;
Fig. 3 is structural representation of the present utility model among the embodiment 2;
Fig. 4 is the partial enlarged drawing among Fig. 3;
Fig. 5 is structural representation of the present utility model among the embodiment 3;
Fig. 6 is the partial enlarged drawing among Fig. 5.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
From the tooth-shape structure that suppresses effective flow area, its structure is shown in Fig. 1-2, this structure comprises: rotor 1, stator 2 and three sealing teeth 3, wherein: rotor 1 is positioned at the below of stator 2, sealing tooth 3 vertically is fixed on the stator 2, the gap of remaining valid between the tooth tip rotor 1 corresponding with it is provided with expansion chamber between tooth and the tooth.The tooth of described sealing tooth 3 comes the nearly increment of stream interface to be provided with a semicircular groove 5 perpendicular to the direction of sealing tooth 3, the length of groove is 1/2 of transverse tooth thickness, along the circumferential direction a week, the degree of depth is 1/4 of transverse tooth thickness, and coming the particular location of the nearly increment of stream interface at tooth is that tooth top is answered stream interface.
From the tooth-shape structure that suppresses effective flow area, its structure as shown in Figure 3-4, this structure comprises: rotor 1, stator 2 and three sealing teeth 3, wherein: rotor 1 is positioned at the below of stator 2, the sealing tooth 3 that is positioned at both sides vertically is fixed on the stator 2, sealing tooth 3 in the middle of being positioned at vertically is fixed on the rotor 1, and each seals the gap of remaining valid between the top of tooth 3 rotor 1 corresponding with it or the stator 2, is provided with expansion chamber between tooth and the tooth.The tooth of described sealing tooth 3 comes the nearly increment of stream interface to be provided with a semicircular groove 5 perpendicular to the direction of sealing tooth 3, the length of groove is 1/2 of transverse tooth thickness, along the circumferential direction a week, the degree of depth is 1/4 of transverse tooth thickness, and coming the particular location of the nearly increment of stream interface at tooth is that tooth top is answered stream interface.
From the tooth-shape structure that suppresses effective flow area, its structure is shown in Fig. 5-6, this structure comprises: rotor 1, stator 2, three sealing teeth 3 and two steps 4, wherein: rotor 1 is positioned at the below of stator 2, sealing tooth 3 vertically is fixed on the stator 2, be positioned at two of both sides sealing teeth 3 under be provided with two steps 4, step 4 is fixed on the rotor 1, the gap of remaining valid between the top rotor 1 corresponding with it of sealing tooth 3 or the step 4 is provided with expansion chamber between tooth and the tooth.The tooth of sealing tooth 3 comes the nearly increment of stream interface to be provided with a semicircular groove 5 perpendicular to the direction of sealing tooth 3, and the length of groove is 1/2 of transverse tooth thickness, and along the circumferential direction a week, the degree of depth is 1/4 of transverse tooth thickness, and coming the particular location of the nearly increment of stream interface at tooth is that tooth top is answered stream interface.
Claims (4)
1. the tooth-shape structure that certainly suppresses effective flow area, it is characterized in that, this structure comprises rotor, stator and sealing tooth, described rotor is positioned at the below of stator, described sealing tooth is provided with several, vertically be fixed on stator or the rotor, maintain the gap between the rotor that the sealing tooth is corresponding with it or the stator, each seals and is provided with the control chamber of expanding between the tooth.
2. according to claim 1ly it is characterized in that from suppressing the tooth-shape structure of effective flow area this structure also includes step, this step be positioned at the sealing tooth under and be vertically fixed on the rotor, described step maintains the gap with sealing between the tooth.
3. according to claim 1 from suppressing the tooth-shape structure of effective flow area, it is characterized in that, the tooth of described sealing tooth comes stream interface to be provided with a semi-circular recesses near sealing tooth tip end perpendicular to the direction that seals tooth, and the length of groove is 1/2 of transverse tooth thickness, and the degree of depth is 1/4 of transverse tooth thickness.
4. the tooth-shape structure from suppressing effective flow area according to claim 3 is characterized in that described groove along the circumferential direction arranges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220497548 CN202851974U (en) | 2012-09-26 | 2012-09-26 | Tooth-shaped structure capable of self-restraining effective flow area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220497548 CN202851974U (en) | 2012-09-26 | 2012-09-26 | Tooth-shaped structure capable of self-restraining effective flow area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202851974U true CN202851974U (en) | 2013-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220497548 Expired - Fee Related CN202851974U (en) | 2012-09-26 | 2012-09-26 | Tooth-shaped structure capable of self-restraining effective flow area |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202851974U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108361384A (en) * | 2018-05-18 | 2018-08-03 | 西安交通大学 | A kind of labyrinth seal structure with inner concave shape sealing tooth |
| CN109538765A (en) * | 2018-11-05 | 2019-03-29 | 西安交通大学 | A kind of reeded low amount of leakage straight-through labyrinth device of band |
-
2012
- 2012-09-26 CN CN 201220497548 patent/CN202851974U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108361384A (en) * | 2018-05-18 | 2018-08-03 | 西安交通大学 | A kind of labyrinth seal structure with inner concave shape sealing tooth |
| CN109538765A (en) * | 2018-11-05 | 2019-03-29 | 西安交通大学 | A kind of reeded low amount of leakage straight-through labyrinth device of band |
| CN109538765B (en) * | 2018-11-05 | 2021-02-02 | 西安交通大学 | Low leakage straight-through labyrinth sealing device with groove |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20130926 |