Novel steam seal for steam turbine generator unit of biomass power plant

Abstract

The utility model discloses a novel steam seal for a steam turbine generator unit of a biomass power plant, which comprises a rotor, a steam seal body sleeved outside the rotor in a clearance manner, and a cylinder body fixedly sleeved on the outer wall of the steam seal body, an annular groove is defined between every two adjacent convex rings, steam sealing teeth are sequentially fixed to the inner wall of the steam sealing body in the steam flow advancing direction, a steam supply mother pipe is arranged on the steam sealing body in the transverse direction of the rotor, and the steam supply mother pipe further comprises two sets of parallel branch pipelines connected with the steam supply mother pipe. The two groups of branch pipelines are respectively connected to the steam seal body between the cylinder bodies, the steam seal teeth comprise short steam seal teeth and long steam seal teeth, the short steam seal teeth and the long steam seal teeth are arranged at intervals, and the opposite surfaces of the short steam seal teeth and the long steam seal teeth are fixedly provided with recoil suppression structures.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine technical field, concretely relates to a new type of gland for biomass power plant steam turbine generator unit. BACKGROUND

[0002] When the steam turbine works, the rotor rotates at high speed while the static part is stationary, and a certain gap must be left between the moving and static parts to avoid collision or friction. However, there is usually a pressure difference between the two sides of the gap, which will cause some steam to leak through the gap, resulting in energy loss and reducing the efficiency of the steam turbine. In order to reduce the loss of steam leakage, a gland is installed at the corresponding part of the steam turbine.

[0003] The shaft end of the steam turbine needs to be installed with a gland to isolate the high-temperature and high-pressure fluid inside the steam turbine, prevent leakage and heat dissipation, and filter and lubricate the air entering the sealing chamber to reduce friction, wear and tear, and prolong the service life of the steam turbine.

[0004] The prior art disclosed in Chinese utility model patent CN209324437U discloses a combined gland device for the shaft end of a steam turbine, which uses multiple upper and lower gland teeth to form a labyrinth gland. However, the installation and maintenance process is relatively complicated, and the labyrinth gland has poor effect on consuming steam leakage energy.

[0005] In view of the above factors, the utility model provides a new type of gland for biomass power plant steam turbine generator unit, which effectively reduces the flow rate and flow of steam entering the gland body, effectively hinders the outflow of steam, and significantly enhances the sealing performance of the gland structure. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a new type of gland for biomass power plant steam turbine generator unit to solve the problems raised in the background art.

[0007] The utility model aims to achieve the following technical scheme: a new type of gland for biomass power plant steam turbine generator unit, comprising a rotor, a gland body sleeved on the outside of the rotor, and a cylinder body fixedly sleeved on the outer wall of the gland body, the outer wall of the rotor is fixedly provided with a plurality of convex rings arranged at equal intervals along the axial direction, an annular groove is enclosed between two adjacent convex rings, and a plurality of gland teeth are fixedly arranged on the inner wall of the gland body in sequence along the steam flow direction.

[0008] Along the transverse direction of the rotor, a steam supply main pipe is arranged on the gland body, the steam supply main pipe further comprises two parallel groups of branch pipes connected to the steam supply main pipe, and the two groups of branch pipes are connected to the steam supply main pipe on the gland body between the cylinder bodies.

[0009] The steam seal teeth comprise steam seal short teeth and steam seal long teeth, which are arranged at intervals, and a back flush inhibiting structure is arranged on the opposite surface of the steam seal short teeth and the steam seal long teeth.

[0010] Further, the back flush inhibiting structure comprises a plurality of adjacent honeycomb hole belt structures, and the honeycomb hole belt is a regular hexagonal hole structure made of high-temperature alloy.

[0011] Further, the back flush inhibiting structure adopts a vacuum fiber welding method to weld the honeycomb hole belt on the surface of the steam seal short teeth and the steam seal long teeth of the steam seal body to form a honeycomb type steam seal.

[0012] Further, the steam supply mother pipe is arranged above the cylinder body and parallel to the cylinder body, and the two groups of branch pipes are respectively connected between the high-pressure cylinder and the low-pressure cylinder of the cylinder body.

[0013] The two groups of branch pipes of the steam supply mother pipe are respectively provided with steam extraction pumps.

[0014] Further, the two groups of branch pipes are respectively connected to the far end and the near end of the high-pressure cylinder and the low-pressure cylinder of the cylinder body.

[0015] Further, the steam seal long teeth are arranged at intervals, and the steam seal short teeth are arranged between the steam seal long teeth.

[0016] The steam seal short teeth close to one side of the high-pressure cylinder and the low-pressure cylinder of the cylinder body are arranged at equal intervals and equal lengths.

[0017] Further, the steam seal long teeth and the steam seal short teeth away from one side of the high-pressure cylinder and the low-pressure cylinder of the cylinder body are arranged at intervals.

[0018] Two adjacent steam seal short teeth are arranged at an angle, and the angle direction of the steam seal short teeth is opposite to the steam flow direction of the high-pressure cylinder.

[0019] Two adjacent steam seal short teeth are arranged at an angle, and the angle direction of the steam seal short teeth is opposite to the air flow direction of the low-pressure cylinder.

[0020] Further, the steam seal body comprises an upper steam seal ring and a lower steam seal ring, and the upper steam seal ring and the lower steam seal ring are fixed by bolts.

[0021] Compared with the prior art, the utility model has the advantages of:

[0022] The utility model discloses a sealing structure and steam supply pipeline system, reduce the flow rate and flow of steam into the steam seal body, and a small amount of leaked steam is recovered by the steam supply pipeline, effectively hinders the outflow of steam and the inflow of air, and significantly enhances the sealing performance of the steam seal structure.

[0023] The utility model discloses a backflushing inhibiting structure is arranged, and the good sealing gap can be kept for a long time in operation, and the sealing effect is stable and long, the backflushing inhibiting structure includes a plurality of adjacent honeycomb hole belt structures, the honeycomb hole belt is the regular hexagon hole structure made of high-temperature alloy, and the backflushing inhibiting structure is welded on the steam seal short tooth and the steam seal long tooth surface of the steam seal body by vacuum fiber welding to form the honeycomb type steam seal.

[0024] The nickel-based high-temperature alloy steel of the honeycomb belt is soft, the regular hexagon honeycomb structure has good overall rigidity and high strength, the high-temperature and high-pressure steam sealing effect is good, the damping effect is obvious, and the energy-saving effect is obvious. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the steam seal and rotor cooperation schematic drawing of the utility model;

[0026] Figure 2 It is the steam seal and rotor cooperation schematic drawing of the utility model;

[0027] Figure 3 It is the steam seal and rotor cooperation schematic drawing of the utility model;

[0028] Figure 4 It is the steam seal and rotor cooperation schematic drawing of the utility model;

[0029] Figure 5 It is the steam seal and rotor cooperation schematic drawing of the utility model;

[0030] Figure 6 It is the steam seal and rotor cooperation schematic drawing of the utility model;

[0031] Figure 7 It is the steam seal and rotor cooperation schematic drawing of the utility model; DETAILED DESCRIPTION

[0032] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, and all other embodiments obtained by the person skilled in the art without creative labor on the basis of the embodiments in the utility model belong to the protection scope of the utility model.

[0033] In the description of the utility model, it needs to be explained that, unless there is definite stipulation and limitation, the terms "mount", "connect", "connection" should be understood in broad sense, for example, it can be fixed connection, also can be detachable connection, or integrally connected, it can be direct connection, also can be indirectly connected through intermediate medium.

[0034] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0035] As shown in Figures 1-7 A new type of steam seal for a biomass power plant steam turbine generator set, including rotor 1, gap sleeve is set on the outer wall of the rotor 1 steam seal body 2, and fixed sleeve is set on the outer wall of the steam seal body 2 steam cylinder body 3, the outer wall of the rotor 1 is fixedly provided with a plurality of convex rings 4 arranged at equal intervals along the axial direction, the annular groove 5 is enclosed between adjacent two convex rings 4, the inner wall of the steam seal body 2 is fixed with steam seal teeth 6 in turn along the steam flow direction;

[0036] Along the transverse direction of the rotor 1, and located on the steam seal body 2 is provided with steam supply main pipe 7, the steam supply main pipe 7 also includes two groups of branch pipes connected with the steam supply main pipe 7, and the two groups of branch pipes are connected on the steam seal body 2 between the steam cylinder body 3;

[0037] The steam seal teeth 6 include steam seal short teeth 61 and steam seal long teeth 62, the steam seal short teeth 61 and the steam seal long teeth 62 are arranged at intervals, and the opposite surface of the steam seal short teeth 61 and the steam seal long teeth 62 is fixedly provided with a backflush suppression structure 8.

[0038] In order to facilitate in use state, through setting backflush suppression structure, long-term good sealing gap can be kept in operation, and the sealing effect is stable and long, the backflush suppression structure 8 includes a plurality of adjacent honeycomb hole belt structures, the honeycomb hole belt is a regular hexagonal hole structure made of high-temperature alloy, and the backflush suppression structure 8 is welded on the surface of the steam seal short teeth 61 and the steam seal long teeth 62 of the steam seal body 2 by vacuum fiber welding to form a honeycomb type steam seal.

[0039] In order to facilitate the use of the state, through the installation of steam supply main pipe and two groups of branch pipeline will enter the low pressure cylinder and high pressure cylinder leakage of steam suction, the steam supply main pipe 7 is located above the cylinder body 3 and parallel to the cylinder body 3, the two groups of branch pipeline are connected between the high pressure cylinder 31 and the low pressure cylinder 32 of the cylinder body 3 respectively;

[0040] The two groups of branch pipeline of the steam supply main pipe 7 are respectively provided with suction pump, and the two groups of branch pipeline are connected with the steam seal body.

[0041] In order to facilitate the use of the state, the steam seal short teeth arranged equidistantly and equally on one side of the high pressure cylinder and the low pressure cylinder of the cylinder body 3 are arranged equidistantly and equally (the steam seal short teeth arranged equidistantly and equally at the connection position of the two groups of branch pipeline and the steam seal) to facilitate the suction of residual steam and air, the two groups of branch pipeline are connected at the far end and the near end of the high pressure cylinder 31 and the low pressure cylinder 32 of the cylinder body 3, the steam seal long teeth 62 are arranged at intervals, and the steam seal short teeth 61 are arranged between the steam seal long teeth 62;

[0042] The steam seal short teeth 61 arranged equidistantly and equally or arranged in steps on one side of the high pressure cylinder 31 and the low pressure cylinder 32 of the cylinder body 3 (the near end of the high pressure cylinder or the far end of the low pressure cylinder).

[0043] Wherein, the far end refers to the side away from the high pressure cylinder, and the near end refers to the side close to the low pressure cylinder. In order to facilitate the use of the state, effectively prevent steam from flowing out of the high pressure cylinder end and air entering the low pressure cylinder, the steam seal long teeth 62 and the steam seal short teeth 61 away from one side of the high pressure cylinder 31 and the low pressure cylinder 32 of the cylinder body 3 are arranged at intervals;

[0044] Two adjacent steam seal short teeth 61 are arranged at an angle, and the inclination direction of the steam seal short teeth 61 is opposite to the steam flow direction of the high pressure cylinder 31;

[0045] Two adjacent steam seal short teeth 61 are arranged at an angle, and the inclination direction of the steam seal short teeth 61 is opposite to the air flow direction of the low pressure cylinder 32.

[0046] In order to facilitate the use of the state, the steam seal body 2 includes an upper steam seal ring and a lower steam seal ring, and the upper steam seal ring and the lower steam seal ring are fixed by bolts.

[0047] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0048] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment according to the present specification needs to exhibit each and every characteristic specified in the present specification. The specification can also be described in terms of a single preferred embodiment, it being understood that this single preferred embodiment can exhibit not every aspect or feature of the present specification. The specification can also be described in terms of a generic statement that the disclosure can include one, some, or all of a list of features. It is further understood that the specification is to be considered as a whole and not with reference to a single feature or design element alone.

Claims

1. A new type of gland seal for a biomass power plant steam turbine generator unit, characterized by: The utility model provides a steam seal structure of steam turbine, including rotor (1), the steam seal body (2) of gap sleeve sets outside the rotor (1), and the steam cylinder body (3) of fixed sleeve sets on the outer wall of steam seal body (2), the outer wall of rotor (1) is fixed with a plurality of convex ring (4) along its axial direction equidistantly, and the annular groove (5) is enclosed between two adjacent convex ring (4), the inner wall of steam seal body (2) is fixed steam seal tooth (6) in turn along the steam flow direction, Along with the transverse direction of rotor (1), and located on steam seal body (2) is provided with steam supply main pipe (7), steam supply main pipe (7) still includes two groups of branch pipe way parallelly connected with steam supply main pipe (7), and two groups of branch pipe way are connected on steam seal body (2) between steam cylinder body (3), Steam seal tooth (6) includes steam seal short tooth (61) and steam seal long tooth (62), steam seal short tooth (61) and steam seal long tooth (62) are arranged at intervals, and the opposite surface of steam seal short tooth (61) and steam seal long tooth (62) is fixed with backflushing suppression structure (8).

2. A new type of gland seal for a biomass power plant steam turbine generator unit as claimed in claim 1, wherein: Backflushing suppression structure (8) includes a plurality of adjacent honeycomb hole belt structure, and the honeycomb hole belt is made of high-temperature alloy into hexagonal hole structure.

3. The new type of gland seal for the biomass power plant steam turbine generator unit according to claim 2, characterized in that: Backflushing suppression structure (8) adopts vacuum fiber welding mode to weld honeycomb hole belt on the surface of steam seal short tooth (61) and steam seal long tooth (62) of steam seal body (2) and forms honeycomb type steam seal.

4. The new type of gland seal for the biomass power plant steam turbine generator unit according to claim 3, characterized in that: Steam supply main pipe (7) is arranged above steam cylinder body (3) and is arranged in parallel with steam cylinder body (3), and two groups of branch pipe way are connected between high-pressure cylinder (31) and low-pressure cylinder (32) of steam cylinder body (3) respectively. Two groups of branch pipe way of steam supply main pipe (7) are respectively provided with air extraction pump.

5. The new type of gland seal for a biomass power plant steam turbine generator unit as claimed in claim 4, wherein: Two groups of branch pipe way are connected at the distal end and the proximal end of high-pressure cylinder (31) and low-pressure cylinder (32) of steam cylinder body (3) respectively.

6. The new type of gland seal for a biomass power plant steam turbine generator unit as claimed in claim 5, wherein: Steam seal long tooth (62) is arranged at intervals, and steam seal short tooth (61) is arranged between steam seal long tooth (62); Steam seal short tooth (61) is arranged equidistantly and equilongly on the side close to high-pressure cylinder (31) and low-pressure cylinder (32) of steam cylinder body (3).

7. The new type of gland seal for a biomass power plant steam turbine generator unit as claimed in claim 6, wherein: Steam seal long tooth (62) and steam seal short tooth (61) are arranged at intervals on the side away from high-pressure cylinder (31) and low-pressure cylinder (32) of steam cylinder body (3); Two adjacent steam seal short tooth (61) are arranged obliquely, and the oblique direction of steam seal short tooth (61) is opposite to the steam flow direction of high-pressure cylinder (31). Two adjacent steam seal short tooth (61) are arranged obliquely, and the oblique direction of steam seal short tooth (61) is opposite to the air flow direction of low-pressure cylinder (32).

8. The new type of gland seal for a biomass power plant steam turbine generator unit as claimed in claim 7, wherein: Steam seal body (2) includes upper steam seal ring and lower steam seal ring, and the upper steam seal ring and the lower steam seal ring are fixed by bolts through splicing.

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