WO2019109197A1

WO2019109197A1 - Turbine housing

Info

Publication number: WO2019109197A1
Application number: PCT/CN2017/114359
Authority: WO
Inventors: 莫品亮; 李志胜
Original assignee: 贵州智慧能源科技有限公司
Priority date: 2017-12-04
Filing date: 2017-12-04
Publication date: 2019-06-13

Abstract

A turbine housing for protecting a turbine. The housing comprises a housing main body (10) and a supporting member (20) for supporting the housing main body (10). The housing main body (10) is divided into a plurality of housing segments (11). A gap allowance (16) is arranged between every two adjacent housing segments (11). The segmented turbine housing can be processed and installed easily.

Description

Turbine wheel cover

Technical field

The present invention relates to the field of turbine covers, and more particularly to a segmented turbine wheel cover.

Background technique

The turbine wheel cover in the gas turbine protects the turbine blades and seals, but the full-circle turbine wheel cover is subjected to thermal expansion after work and is subjected to stress extrusion. In the long-term, stress fatigue is easily caused to fail.

technical problem

In view of this, the present invention proposes a turbine wheel cover that can solve the above problems.

Technical solution

The present invention provides a turbine wheel cover for protecting a turbine, the wheel cover including a wheel cover body and a support member supporting the wheel cover body, the wheel cover body being divided into a plurality of wheel cover segments, and the A gap allowance is left between each adjacent two wheel cover segments.

In an embodiment, each of the wheel cover segments is provided with a hook, and the support member is provided with a first slot corresponding to the hook, and each of the wheel covers is divided by A hook is fixed to the first slot.

In an embodiment, the turbine wheel cover further includes a positioning pin; the hook is provided with a second slot; the support member is inserted into the second slot through the positioning pin to The wheel cover is fixed to the support member as shown.

In an embodiment, the wheel cover body is formed by using a locking piece between each adjacent two wheel cover segments, and the locking piece is used to restrict the wheel cover block from moving in the radial direction. .

In an embodiment, the wheel cover segments are provided with a notch for mounting the locking piece at both ends in the circumferential direction, and the locking piece is shared between each adjacent two wheel cover segments. In order to ensure the sealing effect of the wheel cover body.

In an embodiment, the locking tab includes a first portion interposed with the notch and a second portion extending perpendicularly from the first portion.

In an embodiment, the wheel cover body is divided into eight pieces of the wheel cover segments, and the eight wheel cover segments are all the same.

In an embodiment, the margin remaining between each adjacent two wheel cover segments is equivalent.

In one embodiment, the sum of the clearance margins remaining for each adjacent two wheel shroud segmented brackets is the upper limit of the radial expansion of the turbine wheel shroud at the operating temperature.

In one embodiment, the sum of the gap allowance between each adjacent two wheel cover segments is 3.5 mm.

Beneficial effect

In summary, the present invention proposes a segmented turbine wheel cover, the wheel cover body is connected to the support member, and the wheel cover body is divided into a plurality of wheel cover segments, and each two wheel cover blocks are left between blocks. There is a margin for the thermal expansion of the wheel cover body during operation, which avoids the failure of the wheel cover body to undergo stress extrusion due to thermal expansion under long-term operation, and the block of the present invention is compared with the full ring type turbine wheel cover. The turbine wheel cover is easier to install and simple to machine. In addition, a locking piece is used between each adjacent two wheel cover blocks to limit the integrity of the wheel cover body.

DRAWINGS

1 is an assembled view of a turbine wheel cover in accordance with a consistent embodiment of the present invention.

Figure 2 is a perspective view of the turbine wheel cover of Figure 1.

Figure 3 is a schematic illustration of a wheel cover segmentation.

Figure 4 is a cross-sectional view of the wheel cover block of Figure 3.

Figure 5 is a schematic view showing the installation of the two wheel cover segments shown in Figure 3.

Figure 6 is a schematic view showing the structure of the lock piece.

In the figure, 99-turbine wheel cover, 10-wheel cover body, 11-wheel cover block, 13-hook claw, 15-second notch, 16-gap allowance, 18-lock piece, 181-lock piece The first part, 182-the second part of the locking piece, 19-notch, 20-supporting part, 23-first notch, 25-positioning pin.

Embodiments of the invention

Before the embodiments are described in detail, it is understood that the invention is not limited to The invention may be embodied in other ways. Also, it will be understood that the phraseology and terminology used herein are for the purpose of description The words "including", "comprising", "having", and <RTIgt; </ RTI> <RTIgt; </ RTI> used herein are meant to include the items listed thereafter, their equivalents, and other additional items. In particular, when describing "a certain element", the present invention does not limit the number of the elements to one, and may include a plurality.

A turbine wheel cover 99 as shown in FIG. 1 includes a wheel house body 10 and a support member 20 that supports the wheel house body 10.

In the present embodiment, the wheel house body 10 is divided into eight wheel cover segments 11, it being understood that this is only one embodiment of the present invention. In other embodiments, the wheel house body 10 can also be divided into The other number of wheel cover segments 11 does not limit the number of the wheel house main body 10 divided into the wheel cover segments 11.

As shown in FIG. 2 to FIG. 4, each wheel cover block 11 is provided with hooks 13 and a second slot 15 is provided between each of the hooks 13. The support member 20 is provided with a first notch 23 corresponding to the claw 13 and a positioning pin 25 corresponding to the second notch 15. The hook 13 and the positioning pin 25 are respectively engageable in the first notch 23 and the second notch 15, so that the wheel cover segment 11 is fixed to the support member 20. The wheel cover body 10 is formed by sequentially fixing each wheel cover block 11 to the support member 20. The support of the wheel house main body 10 by the support member 20 ensures a good gap between the wheel house main body 10 and the turbine blades. Compared with the full ring type turbine wheel cover, the block type turbine wheel cover 99 of the present embodiment is more convenient to install and simpler to process.

More specifically, in order to prevent stress extrusion of the turbine wheel cover 10 during thermal expansion during operation, a gap allowance 16 is left between each two adjacent wheel cover segments 11, and the clearance margin 16 causes the wheel cover 10 to There is an expansion margin in the circumferential direction, and the clearance margin 16 is the upper limit of the expansion of the wheel house main body 10 at the operating temperature. A gap allowance 16 is left between each two adjacent wheel cover segments 11, it being understood that this is only one embodiment of the present invention, in other embodiments, two adjacent wheels. The gap allowance 16 is not limited between the cover segments 11 and is not limited by the present invention.

In the present embodiment, the sum of the gap margins 16 is 3.5 mm. It should be understood that this is only one embodiment of the present invention. In other embodiments, the gap margin 16 may be set according to different expansion upper limit values. The other values are determined, and the specific value of the gap margin 16 is not limited in the present invention.

As shown in FIG. 5 to FIG. 6 , the lock piece 18 is used between the two adjacent wheel cover segments to define the wheel cover body. The locking tab 18 limits the radial movement of the wheel cover segments 11 and also ensures the integrity of the wheel house body 10, preventing the gas in the turbine wheel housing 99 from circulating with the outside air.

A notch 19 for mounting the locking piece 18 is provided at both ends of the wheel cover block 11 in the circumferential direction, and a locking piece 18 is shared between each adjacent two wheel cover segments 11. The two notches 19 at the end of each adjacent two-wheel cover block 11 form a space for receiving the locking piece 18, the width of which is equivalent to the width of the locking piece 18, that is, the width of the notch 19 is two points of the width of the locking piece 18. one. The locking tab 19 includes a first portion 181 that is inserted into the notch 18 and a second portion 182 that extends perpendicularly from the first portion 181, and has an overall L-shaped configuration. The sealing effect of the wheel house main body 10 is also ensured by inserting the locking piece 18 in the notch 19, that is, without affecting the thermal expansion in the circumferential direction when the wheel cover block 11 is in operation.

In summary, the present invention provides a segmented turbine wheel cover, the wheel cover body 10 is coupled to the support member 20, and the wheel cover body 10 is divided into a plurality of wheel cover segments 11, each of which is divided into two segments. Between the blocks, there is a gap 16 for the wheel cover body 10 to be thermally expanded during operation, which avoids the failure of the wheel house main body 10 to undergo stress extrusion due to thermal expansion under long-term operation, and is compared with the full-circular turbine wheel. The cover, the segmented turbine wheel cover of the present invention is easier to install and simple to machine. In addition, the locking piece 18 is used for limiting between each adjacent two wheel cover segments 11, thereby ensuring the integrity of the wheel cover body 10.

The concepts described herein may be embodied in other forms without departing from the spirit and scope. The specific embodiments disclosed are to be considered as illustrative and not restrictive. Therefore, the scope of the invention is to be determined by the appended claims Any changes which come within the meaning and range of the claims are intended to be within the scope of the claims.

Claims

A turbine wheel cover for protecting a turbine, the wheel cover comprising a wheel cover body and a support member supporting the wheel cover body, the wheel cover body being divided into a plurality of wheel cover segments, and There is a gap margin between each adjacent two wheel cover segments.
A turbine wheel cover according to claim 1, wherein each of said wheel cover segments is provided with a claw, and said support member is provided with a first notch corresponding to said claw, said each The wheel cover segments are secured to the first slot by securing the hooks.
A turbine wheel cover according to claim 2, wherein said turbine wheel cover further comprises a positioning pin; said hook is provided with a second notch; said support member being engaged by said positioning pin The wheel cover is segmented and fixed to the support member shown in the second slot.
The turbine wheel cover of claim 1 wherein said each of said two adjacent wheel cover segments is restrained by a locking tab to form said wheel cover body, said locking tab for limiting said The wheel cover segments are strung in the radial direction.
A turbine wheel cover according to claim 4, wherein both ends of the wheel cover block are provided with notches for mounting the locking piece at both ends in the circumferential direction, and each adjacent two wheel cover blocks are divided. A locking piece is shared between them to ensure the sealing effect of the wheel cover body.
The turbine wheel cover of claim 5 wherein said locking tab includes a first portion interposed with said indentation and a second portion extending perpendicularly from said first portion.
The turbine wheel cover of claim 1 wherein said wheel cover body is divided into eight said wheel cover segments, said eight wheel cover segments being identical.
The turbine wheel cover of claim 1 wherein said gap between said adjacent two wheel cover segments is equivalent.
A turbine wheel cover according to claim 1 wherein said sum of clearance margins remaining in each of said two adjacent wheel cover segmented brackets is an upper limit of said radial expansion of said turbine wheel cover at operating temperature value.
The turbine wheel cover of claim 9 wherein said sum of gap allowance between each adjacent two wheel cover segments is 3.5 mm.