CN204663591U

CN204663591U - A kind of Turbine Steam seal structure

Info

Publication number: CN204663591U
Application number: CN201520388196.6U
Authority: CN
Inventors: 陈光庭
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-06-06
Filing date: 2015-06-06
Publication date: 2015-09-23
Anticipated expiration: 2025-06-06

Abstract

The utility model discloses a kind of Turbine Steam seal structure, comprise rotor, packing section former on described rotor or the annulus boss circumference that newly installs additional are cut into some sections, on the end face of every section of boss, according to sense of rotation, the scarf having one by one and push leaked steam function of cutting sth. askew out.The utility model sealing is conceived to the transformation of rotor portion corresponding to packing.According to seal section length, the annulus boss circumference of the packing section (or newly installing additional) of original rotor is cut out several breach, forms some sections of isometric projections, a part that the end face of projection is cut sth. askew forms scarf.When rotor turns gets up, each segmentation just defines the effect of pumping with the projection of scarf, on the one hand part is leaked the direct push and block of vapour to live, on the other hand, there is no the leakage vapour that complete push and block are lived, also under the effect of pumping, larger flow-disturbing can be produced, greatly strengthen the effect of labyrinth seal below.

Description

A kind of Turbine Steam seal structure

Technical field

The utility model relates to the heterogeneous seal arrangement of a kind of turbine steam seal, is applicable to reduce turbine steam seal and leaks, improve steam turbine efficiency.Belong to industrial steam turbine technical field.

Background technique

Along with the consumption reduction further propelling of situation of global range energy-saving and the development of steam turbine technology, Turbine Flow Path design, manufacturing technology become better and approaching perfection day by day, and leakage losses has become one of key factor of restriction turbine efficiency raising.

Correlative study shows, between stage, steam leakage makes unit internal efficiency reduce, and leakage losses accounts for 29% of grade total losses, and wherein movable vane top leakage losses then accounts for 80% of total leakage losses, than the profile loss of stator blade or movable vane or secondary flow loss also large, the latter only accounts for grade total losses 15%.Foreign literature on affecting that steam turbine is high, the principal element of intermediate pressure cylinder power and heat consumption rate carried out induction and contrast, affecting that steam turbine is high, in the factor of intermediate pressure cylinder power and heat consumption rate: what have the greatest impact to high intermediate pressure cylinder power and hear rate is packing (comprising shaft seal, diaphragm gland, dynamic blade tip seal), accounts for 67% of total losses; Next is surface roughness, accounts for 31%; The loss that the damage of flow passage component causes only accounts for 2%.

In addition, the peripheral velocity of leaked steam is uneven, and this may cause flowing steam to produce exciting when nominal operating condition, causes unit vibration, causes whole steam turbine operation unstable.The steam leakage of shaft seal is except wasting a large amount of high-quality steam, and the steam that leaks outside enters bearing housing, makes oil mixed with water, oily emulsification, causes lubricant film Quality Down, causes oil whip, causes unit vibration even bearing liner burnout shutdown; Intake in oil and also can cause adjustment member corrosion bite, affect Turbine Safety and run.

Therefore, domestic and international each steam turbine producer and with paying attention to the design of packing per family especially, manufacture, installation and operation safeguard.According to the difference of packing position and function, packing is mainly divided into shaft end gland seal (shaft seal), diaphragm gland and blade tip seal three large; Different according to sealing principle, packing can be divided into contactless packing and contact-type packing.The former comprises comb packing, brandon steam-glanding, side tooth packing, DAS packing, Honeycomb steam seal etc.; The latter comprises brush steam seal, contact-type packing etc.

The design of above-mentioned packing sealing has a common feature, and namely Seal Design is only limitted to packing static part, finds no the design proposal transformed steam turbine rotating part.

Model utility content

The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of sealing effect better Turbine Steam seal structure.

To achieve these goals, the utility model adopts following technological scheme:

A kind of Turbine Steam seal structure, comprises rotor, and packing section former on described rotor or the annulus boss circumference that newly installs additional are cut into some sections, on the end face of every section of boss, according to sense of rotation, and the scarf having one by one and push leaked steam function of cutting sth. askew out.

Compared with prior art, the utility model has following beneficial effect: the utility model sealing is conceived to the transformation of rotor portion corresponding to packing.According to seal section length, the annulus boss circumference of former packing section (or newly installing additional) is cut into some sections, on the end face of every section of boss, according to sense of rotation, the scarf having one by one and push leaked steam function of cutting sth. askew out.When rotor turns gets up, each segmentation just defines the effect of pumping with the projection of scarf, on the one hand part is leaked the direct push and block of vapour to live, on the other hand, there is no the leakage vapour that complete push and block are lived, also under the effect of pumping, larger flow-disturbing can be produced, greatly strengthen the effect of labyrinth seal below.

Accompanying drawing explanation

Fig. 1 is existing turbine steam seal structural representation;

Fig. 2 is turbine steam seal structural representation of the present utility model;

Fig. 3 be the annulus boss of Turbine Steam seal structure of the present utility model stretching after cross section structure schematic diagram;

Fig. 4 is that the rotor of Turbine Steam seal structure of the present utility model coordinates schematic diagram with stator.

Embodiment

As shown in Fig. 2,3 and 4, a kind of Turbine Steam seal structure, comprises rotor 1 and labyrinth casing 2, and annulus boss 12 circumference on annulus boss 11 surface of the former packing section (or newly installing additional) of described rotor 1 cuts out several breach 13, forms isometric some sections of projections 14; On the end face of projection 14 according to several angle cut sth. askew a part formed scarf 15.

During work, when rotor 1 rotates, each segmentation just defines the effect of pumping with the projection 14 of scarf 15, on the one hand part is leaked the direct push and block of vapour to live, on the other hand, there is no the leakage vapour that complete push and block are lived, also can under the effect of pumping, produce larger flow-disturbing, greatly strengthen the effect of labyrinth seal below.

Claims

1. a Turbine Steam seal structure, comprise rotor, it is characterized in that packing section former on described rotor or the annulus boss circumference that newly installs additional to be cut into some sections, on the end face of every section of boss, according to sense of rotation, the scarf having one by one and push leaked steam function of cutting sth. askew out.