CN105135476A - Lining assembly - Google Patents

Abstract

The invention relates to the field of dry low-emission combusting chambers and relates to a lining assembly. The lining assembly aims at solving the problem that gas leakage easily occurs on an existing lining assembly. The lining assembly comprises a lining sleeve, a Venturi tube, a sealing gasket and a fastener, wherein the downstream end of the lining sleeve is provided with an outer sealing edge extending from the upstream to the downstream, the downstream end of the Venturi tube is provided with an inner sealing edge extending from the upstream to the downstream, and a gap is formed between the inner sealing edge and the outer sealing edge. The sealing gasket is arranged in the gap in a sealed. The fastener is used for fixing the outer sealing edge, the sealing gasket and the inner sealing edge. The lining assembly can eliminate air leakage through the pressing effect of the fastener and the sealing gasket while ensuring the assembling relation of the lining sleeve and the Venturi tube. The component relation between the Venturi tube and the lining sleeve is not changed, and processing and manufacturing are facilitated. The stress produced by the lining sleeve and the Venturi tube due to thermal expansion can be released through deformation of the sealing gasket, stress concentration can be effectively prevented, and the mechanical property of the combusting chambers can be ensured.

Description

A kind of bush assembly

Technical field

The present invention relates to dry low emission combustor field, be specifically related to a kind of bush assembly.

Background technology

As everyone knows, the inlet temperature of turbine will affect the efficiency of gas-turbine unit, therefore along with gas-turbine unit power, the improving constantly of efficiency requirements, turbine inlet temperature (TIT) requires also to raise gradually, causes turbine heat load to increase and the increase of combustion chamber NOx emission.

In recent years, country controls more to pay attention to air-polluting, and the NOx emission restriction of national legislation to gas turbine is also further strict.The NOx emission key controlling gas turbine is the flame temperature in control combustion district, along with combustion engine development, combustor exit temperature improves constantly, contradiction between premixed gas and cooling-air is difficult to balance more, therefore in Combustion chamber design process, optimization component structure is needed, eliminate unnecessary air leakage, thus increase premix air capacity and cooling air volume, promote discharge and the life performance of combustion chamber.

Chinese patent CN101995021A is using the lining of a part for Venturi tube section as the upstream of bushing sleeves, thus prevent air from leaking from the gap between bushing sleeves and venturi section, but the program cannot realize structural modularized design, greatly increases difficulty of processing; Simultaneously after Venturi tube section expanded by heating, bushing sleeves swell increment is relatively little, easily produces thermal stress at both places of being connected, and thermal stress is difficult to release, reduces the mechanical property of combustion chamber.

Summary of the invention

The object of this invention is to provide a kind of bush assembly, at least to solve the problem that Leakage Gas easily occurs current bush assembly.

Technical scheme of the present invention is:

A kind of bush assembly, comprising:

Liner sleeve, downstream has the external seal limit from upstream toward downstream expansion;

Venturi tube, is positioned at the inner side of described liner sleeve, and the downstream of described Venturi tube has sealing strip in upstream toward downstream expansion, forms gap between described interior sealing strip and described external seal limit;

Sealing gasket, sealing is arranged in described gap;

Securing member, for being fixed described external seal limit, described sealing gasket and described interior sealing strip.

Alternatively, the side towards described interior sealing strip on described external seal limit has boss, for described sealing gasket is resisted against described interior sealing strip.

Alternatively, described Venturi tube comprises venturi inwall and venturi outer wall, and described interior sealing strip is arranged on the downstream of described venturi outer wall.

Alternatively, described external seal limit and described interior sealing strip are all in horn-like.

Alternatively, described external seal limit all becomes 30 ~ 60 degree of angles with described liner sleeve axis;

Described interior sealing strip all becomes 30 ~ 60 degree of angles with described liner sleeve axis.

Alternatively, described gap is horn-like.

Alternatively, described securing member is bolt.

Beneficial effect of the present invention:

Bush assembly of the present invention while guarantee liner sleeve and Venturi tube assembly relation, can eliminate the leakage of air by the pressuring action of securing member and sealing gasket; Do not change the spare part relation between Venturi tube and liner sleeve, be convenient to processing and manufacturing; The stress produced because of thermal expansion between liner sleeve and Venturi tube, can be discharged by the distortion of sealing gasket, effectively can prevent stress from concentrating, ensure combustion chamber mechanical property.

Accompanying drawing explanation

Fig. 1 is the simplification view in the cross section of prior art bush assembly;

Fig. 2 is the simplification view in the cross section of bush assembly of the present invention;

Fig. 3 is the detailed view in cross section, sealing gasket place in Fig. 2.

Reference numeral:

Bush assembly 10,40;

Liner sleeve 11,41;

External seal limit 42;

Venturi tube 12,43;

Interior sealing strip 44;

Gap 45;

Securing member 46;

Sealing gasket 47;

Boss 48;

Rivet 13,50;

Venturi inwall 14,51;

Venturi outer wall 15,52.

Detailed description of the invention

Here will be described exemplary embodiment in detail, its sample table shows in the accompanying drawings.When description below relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawing represents same or analogous key element.

Shown in figure 1, show generally existing gas-turbine combustion chamber bush assembly (10), this bush assembly 10 comprises liner sleeve 11, it should be noted that, Fig. 1 (and follow-up Fig. 2 and Fig. 3) only illustrates bush assembly 10 1 cross sections, complete bush assembly 10 is in the form of a ring, and the liner sleeve 11 that it comprises, Venturi tube 12 etc. all in the form of a ring, repeat no more.

Venturi tube 12 its there is venturi inwall 14 and venturi outer wall 15, and both coaxially place, between form annular flow passage; Rivet 13 is circumferentially spaced apart, and for liner sleeve 11 and the Venturi tube 12 of being connected, and liner sleeve 11 and Venturi tube 12 are coaxially placed.

In existing bush assembly 10, between liner sleeve 11 and Venturi tube 12, there is no Seal Design, therefore there is the leakage of air between the two, premix air capacity and the cooling air volume of combustion chamber will be affected, worsen chamber performance.

With reference to figure 2, the burner inner liner assembly 40 of the embodiment of the present invention, this bush assembly 40 comprises liner sleeve 41; The downstream of liner sleeve 41 has the external seal limit 42 from upstream toward downstream expansion, and namely external seal limit 42 is in approximate horn-like, and external seal limit 42 is 30 ~ 60 degree of angles with the central axis of liner sleeve 41, in the present embodiment, is preferably 30 degree.

Venturi tube 43 is positioned at the inner side of liner sleeve 41, and its downstream has sealing strip 44 in upstream toward downstream expansion, and namely, sealing strip 44 is in approximate horn-like; Further, the placement parallel with external seal limit 42 of interior sealing strip 44, forms the gap 45 of annular between interior sealing strip 44 and external seal limit 42.

Venturi tube 43 Upstream section is also divided into venturi inwall 51 and venturi outer wall 52, and venturi outer wall 52 is connected by welding with interior sealing strip 44; Rivet 50 is for liner sleeve 41 and the Venturi tube 43 of being connected, and rivet 50 is welded in liner sleeve 41.

With reference to figure 3, in the gap 45 outside between sealing strip 42 and interior sealing strip 44, sealing is provided with the sealing gasket 47 of annular, for the sealing between liner sleeve 41 and Venturi tube 43, prevents unnecessary air leakage.

Securing member 46, for external seal limit 42, sealing gasket 47 and interior sealing strip 44 being fixed, simultaneously for compressing external seal limit 42 and interior sealing strip 44, making sealing gasket 47 compress distortion, ensureing sealing property; Securing member 46 can adopt rivet, bolt etc., is preferably bolt in the present embodiment.

Further, the side towards interior sealing strip 44 on external seal limit 42 has boss 48, for sealing gasket 47 is resisted against interior sealing strip 44, makes sealing gasket 47 be out of shape more abundant, to reduce sealing area, ensures sealing property.

Bush assembly 40 of the present invention can while guarantee liner sleeve 41 with Venturi tube 43 assembly relation, is eliminated the leakage of air by the pressuring action of securing member 46 and sealing gasket 47; Do not change the spare part relation between Venturi tube 43 and liner sleeve 41, be convenient to processing and manufacturing; The stress produced because of thermal expansion between liner sleeve 41 and Venturi tube 43, can be discharged by the distortion of sealing gasket 47, effectively can prevent stress from concentrating, ensure combustion chamber mechanical property.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.

Claims (7)

1. a bush assembly, is characterized in that, comprising:

Liner sleeve (41), downstream has the external seal limit (42) from upstream toward downstream expansion;

Venturi tube (43), be positioned at the inner side of described liner sleeve (41), the downstream of described Venturi tube (43) has sealing strip (44) in upstream toward downstream expansion, forms gap (45) between described interior sealing strip (44) and described external seal limit (42);

Sealing gasket (47), sealing is arranged in described gap (45);

Securing member (46), for being fixed described external seal limit (42), described sealing gasket (47) and described interior sealing strip (44).

2. bush assembly according to claim 1, it is characterized in that, the side towards described interior sealing strip (44) of described external seal limit (42) has boss (48), for described sealing gasket (47) is resisted against described interior sealing strip (44).

3. bush assembly according to claim 1, it is characterized in that, described Venturi tube (43) comprises venturi inwall (51) and venturi outer wall (52), and described interior sealing strip (44) is arranged on the downstream of venturi outer wall (52).

4. bush assembly according to claim 1, is characterized in that, described external seal limit (42) and described interior sealing strip (44) are all in horn-like.

5. bush assembly according to claim 4, is characterized in that, described external seal limit (42) all becomes 30 ~ 60 degree of angles with described liner sleeve (41) axis;

Described interior sealing strip (44) all becomes 30 ~ 60 degree of angles with described liner sleeve (41) axis.

6. bush assembly according to claim 1, is characterized in that, described gap (45) are in horn-like.

7. bush assembly according to claim 1, is characterized in that, described securing member (46) is bolt.