Novel steam seal structure for flow guide type steam turbine
By adopting a novel flow-guiding steam seal structure in the steam turbine, the problem of friction and collision between the moving and stationary components of the steam turbine is solved by increasing the steam flow resistance and dissipating heat using inclined and transverse small teeth, thus achieving efficient sealing and safe operation.
Patent Information
- Application Number
- CN202423086180.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-13
AI Technical Summary
The steam seal structure between the moving and stationary components of the steam turbine is prone to friction and collision due to malfunctions, which can cause permanent bending of the main shaft and pose a significant safety hazard.
A novel steam seal structure for a steam turbine with a flow guide is designed, including a mounting ring, a steam seal ring, and a flow obstruction block. The structure is equipped with inclined small teeth and transverse small teeth to increase the steam flow resistance and dissipate heat, thus forming a multi-stage pressure reduction effect.
It improves sealing performance, reduces steam leakage, enhances unit thermal efficiency and safety, and reduces the risk of friction and collision between moving and stationary parts.
Smart Images
Figure CN223562873U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a steam seal technical field, especially a new type of diversion formula steam turbine steam seal structure. BACKGROUND
[0002] Steam turbine is a high-speed rotating large and precise heat power conversion mechanical. A certain axial and radial gap must be reserved between the static body such as cylinder and diaphragm and the rotating body such as main shaft and blade to avoid the friction and collision of moving and static parts when the unit is working. In order to reduce the steam leakage of steam seal gap, steam seal device must be set to make the steam seal gap in the standard range and tend to the minimum value under the premise of ensuring no friction between moving and static parts, so as to reduce the steam leakage loss between each stage and each cylinder of multi-stage steam turbine and improve the thermal efficiency of the unit.
[0003] However, steam turbine is a high-speed rotating mechanical, and the safety of friction and collision between moving and static parts must be considered while reducing the leakage of through-flow gap (i.e. steam seal leakage). Steam seal is a transition part between moving and static parts of steam turbine, and it is easy to cause direct friction and collision between moving and static parts of steam turbine due to steam seal body failure, which can damage the large shaft of steam turbine, and even cause permanent bending of the large shaft and serious accidents. Therefore, people have been exploring new steam seal structure to solve the dilemma of improving the sealing performance and ensuring the safe operation of the unit. CONTENT OF THE UTILITY MODEL
[0004] The utility model discloses a new type of diversion formula steam turbine steam seal structure, which can solve the problem of friction and collision between moving and static parts of steam turbine due to steam seal body failure, which can damage the large shaft of steam turbine, and even cause permanent bending of the large shaft and serious accidents.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a new type of diversion formula steam turbine steam seal structure, which comprises a mounting snap ring and a steam seal device. The inner surface of the mounting snap ring is fixedly connected with a steam seal ring, and four annular cavities are formed in the inner part of the steam seal ring. The steam seal device comprises a flow resistance block, four inclined small teeth and two transverse small teeth. The flow resistance block is fixedly connected in the inner part of the annular cavity. The four inclined small teeth are all fixedly connected in the inner part of the annular cavity, and are all in an inclined state. The two transverse small teeth are both fixedly connected in the inner part of the annular cavity. The inner parts of the four annular cavities are provided with the same structure.
[0006] Preferably, an annular clamping groove is formed in the outer surface of the mounting snap ring.
[0007] Preferably, annular high teeth are fixedly connected in the inner part of the steam seal ring at equal intervals, and annular inclined teeth are fixedly connected in the inner part of the steam seal ring.
[0008] Preferably, the inner part of the steam seal ring is fixedly connected with four second high teeth at equal intervals.
[0009] Preferably, the inner part of the steam seal ring is fixedly connected with a second bevel tooth at the inner side of two adjacent second high teeth.
[0010] Preferably, the inner part of the steam seal ring is fixedly connected with annular dense teeth at equal intervals.
[0011] Compared with the prior art, the novel steam seal structure for a flow guide type steam turbine has the beneficial effects that:
[0012] 1. The novel steam seal structure for a flow guide type steam turbine simultaneously learns from the "friction effect - the rougher the flow channel surface, the better the sealing effect", in order to reduce the steam flow velocity and increase the steam flow resistance, more inclined small teeth and transverse small teeth are arranged in the annular cavity, the kinetic energy of the high-speed steam flow which is forced into the annular cavity due to inertia is consumed, the steam flow is fully heat dissipated in the annular cavity, and the inclined small teeth in the annular cavity form a certain angle of inclination to increase the steam resistance. BRIEF DESCRIPTION OF DRAWINGS
[0013] The novel steam seal structure for a flow guide type steam turbine will be further described below in combination with the drawings and embodiments:
[0014] Figure 1 It is a whole structure schematic view of the novel steam seal structure for a flow guide type steam turbine.
[0015] Figure 2 It is a surface structure schematic view of the second bevel tooth.
[0016] Figure 3 It is a surface structure schematic view of the annular dense tooth.
[0017] Figure 4 It is a whole structure schematic view of the novel steam seal structure for a flow guide type steam turbine. Figure 1 It is an enlarged structure schematic view of A.
[0018] The drawings show that: 1, mounting clasp; 2, annular clamping groove; 3, steam seal ring; 4, annular high tooth; 5, annular bevel tooth; 6, annular cavity; 7, flow resistance block; 8, inclined small tooth; 9, transverse small tooth; 10, second high tooth; 11, second bevel tooth; 12, annular dense tooth. DETAILED DESCRIPTION
[0019] This part will describe the specific embodiments of the novel steam seal structure for a flow guide type steam turbine in detail, the preferred embodiments of the novel steam seal structure for a flow guide type steam turbine are shown in the drawings, the drawings are used to supplement the description of the text part of the specification, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the novel steam seal structure for a flow guide type steam turbine, but it cannot be understood as a limitation on the protection scope of the novel steam seal structure for a flow guide type steam turbine.
[0020] In the description of the utility model, it needs to be understood that, when the direction description such as upper, lower, front, back, left, right and the like is referred to, the direction or positional relationship shown based on the drawing is only for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the device or element indicated must have a particular direction, a particular direction configuration and operation, and therefore it cannot be understood as a limitation on the utility model.
[0021] In the description of the utility model, greater than, less than, more than and the like are understood as not including the number, and above, below and the like are understood as including the number.If the first and the second are described, it is only for the purpose of distinguishing technical features, and it cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or the sequence of the indicated technical features.
[0022] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.
[0023] Embodiment one: please refer to Figure 1 And Figure 4 The utility model provides a technical scheme: a novel steam seal structure for flow guide type steam turbine, including installation snap ring 1 and steam seal device, the outer surface of installation snap ring 1 is provided with annular clamping groove 2, the inner surface of installation snap ring 1 is fixedly connected with steam seal ring 3, the inside of steam seal ring 3 is fixedly connected with annular high tooth 4 at equal intervals, the inside of steam seal ring 3 is fixedly connected with annular bevel gear 5, four annular cavities 6 are set in the inside of steam seal ring 3;
[0024] Steam seal device includes resistance block 7, four oblique pinion 8 and two transverse pinion 9, resistance block 7 is fixedly connected in the inside of annular cavity 6, four oblique pinion 8 are all fixedly connected in the inside of annular cavity 6, four oblique pinion 8 are all in the state of inclination, two transverse pinion 9 are all fixedly connected in the inside of annular cavity 6, the inside of four annular cavities 6 is provided with the same structure.
[0025] The steam seal structure can carry out flow guide type multistage secondary pressure reduction, the steam seal is improved on the traditional comb tooth steam seal, has the advantages of gap requirement insensitivity, high safety, the steam blocking rate is 35% higher than the traditional comb tooth steam seal under the same gap, reduces the heat consumption of unit, improves the economy of unit, is applicable to any position in steam turbine, and the effect is most obvious at high temperature and high pressure position.Due to the special structure, it has the most prominent "energy-saving long-term effect" among various steam seal forms on the market,
[0026] The diversion type multi-stage pressure reduction steam seal is a safe, efficient and durable new type steam seal which combines the steam seal principle of not reducing the dynamic and static gap and increasing the through-flow area, and the steam seal principle of changing the structure of the annular cavity 6 and changing the steam flow path to improve heat dissipation.
[0027] The design concept is based on the thermodynamic effect that the larger the annular cavity 6 is, the better the sealing effect is. The laced tooth steam seal is expanded to increase the steam contact surface area and reduce the steam leakage.
[0028] Meanwhile, the design concept is based on the friction effect that the rougher the flow channel surface is, the better the sealing effect is. In order to reduce the steam flow speed and increase the steam flow resistance, a plurality of inclined small teeth 8 and transverse small teeth 9 (see Figure 4 ) are arranged in the annular cavity 6 to consume the kinetic energy of the high-speed steam flow which is forced into the annular cavity 6 due to inertia, so that the steam flow is fully heat-dissipated in the annular cavity 6. The inclined small teeth 8 in the annular cavity 6 form a certain angle of inclination to increase the steam resistance.
[0029] The steam flow convection principle is also used to offset the principle. Since the steam flow out of the annular cavity 6 is heat-dissipated through the annular cavity 6, the steam density is increased and the temperature is reduced. The jetted steam flow and the inlet steam flow of the annular inclined teeth 5 form a 90-degree angle to further increase the steam resistance.
[0030] Embodiment two: please refer to Figure 2 ;
[0031] The inside of the steam seal ring 3 is fixedly connected with four second high teeth 10 at equal intervals, and the inside of the steam seal ring 3 is fixedly connected with second inclined teeth 11.
[0032] The diversion type inclined side tooth steam seal is a modified version of the laced tooth steam seal, which inherits the safe and reliable characteristics of the laced tooth steam seal. In terms of economy, the low teeth are changed to inclined teeth, and the high teeth have an inclination angle. Compared with the laced tooth steam seal, the steam resistance is increased by about 6% under the same gap condition. The diversion type inclined side tooth steam seal is suitable for any position in the steam turbine and is often used in combination with the diversion type multi-stage pressure reduction steam seal.
[0033] Embodiment three: please refer to Figure 3 ;
[0034] The inside of the steam seal ring 3 is fixedly connected with annular dense teeth 12 at equal intervals.
[0035] The diversion type dense tooth steam seal increases the number of teeth based on the laced tooth steam seal, and the steam resistance effect is better than that of the laced tooth steam seal. The diversion type dense tooth steam seal can be applied to any position of the steam turbine steam seal system, and the dense and numerous steam seal teeth can better achieve the effect of flow disturbance. At the same time, due to the high water repellency, the diversion type dense tooth steam seal is often used in the low-pressure cylinder. The diversion type dense tooth steam seal is often used in combination with the diversion type multi-stage pressure reduction steam seal.
[0036] The utility model embodiment has been explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiment, still can make various changes in the knowledge range of ordinary skill in the art who has possessed under the premise of not departing from the utility model tenet.
Claims
1. A novel structure of a steam seal for a flow-guided steam turbine, characterized by The installation snap ring (1) and the steam seal device are included. The inner surface of the installation snap ring (1) is fixedly connected with the steam seal ring (3), and four annular cavities (6) are arranged in the steam seal ring (3). The steam seal device includes a flow blocking block (7), four inclined small teeth (8) and two transverse small teeth (9), the flow blocking block (7) is fixedly connected in the annular cavity (6), the four inclined small teeth (8) are fixedly connected in the annular cavity (6), the four inclined small teeth (8) are in an inclined state, the two transverse small teeth (9) are fixedly connected in the annular cavity (6), and the four annular cavities (6) are provided with the same structure. The outer surface of the installation snap ring (1) is provided with an annular clamping groove (2).
2. A novel structure of a steam seal for a flow-guided steam turbine according to claim 1, characterized in that: The inner surface of the steam seal ring (3) is fixedly connected with an annular high tooth (4) at equal intervals, and the inner surface of the steam seal ring (3) is fixedly connected with an annular inclined tooth (5).
3. A novel structure of a steam seal for a flow-guided steam turbine according to claim 1, characterized in that: The inner surface of the steam seal ring (3) is fixedly connected with four second high teeth (10) at equal intervals.
4. A novel structure of a steam seal for a flow-guided steam turbine according to claim 1, characterized in that: The inner surface of the steam seal ring (3) is fixedly connected with a second inclined tooth (11), and the second inclined tooth (11) is located inside the adjacent two second high teeth (10).
5. A novel type of steam seal structure for a flow-guided steam turbine according to claim 4, characterized in that: The inner surface of the steam seal ring (3) is fixedly connected with an annular dense tooth (12).
6. A novel structure of a steam seal for a flow-guided steam turbine according to claim 1, characterized in that: