CN206360732U - A kind of steam turbine cylindrical high voltage cylinder - Google Patents

Abstract

A kind of steam turbine cylindrical high voltage cylinder, the high pressure cylinder is double shell structure, and with the inner casing and outer shell being set in together, inner casing and outer shell are respectively tubular construction；Inner casing is mainly made up of the inner casing upper half and inner casing lower half of upper and lower directional combination, and the inner casing upper half and inner casing lower half circumferentially combined are integral by being sleeved on their circumferentially external multiple tracks collar connections；The main outer shell by axial segmentation of outer shell right half and an outer shell left side are partly constituted, there is abutted flange in the axial direction between outer shell right half and outer shell left half, multiple bolts hole are disposed with the circumference of abutted flange, many connecting bolts connection that the outer shell being axially docking together right half and outer shell left half are connected on abutted flange is combined.It had both been easy to efficiently assembled formation, the structure and good steam tightness with high intensity, can bear higher pressure, be applicable to the use requirement of steam inlet condition >=35MPa supercritical turbine unit, good reliability is practical.

Description

A kind of steam turbine cylindrical high voltage cylinder

Technical field

The utility model is related to steam turbine high-pressure cylinder.

Background technology

Barrel-type casing refers to that cylinder body is cylindrical in shape, cylinder without horizontal flange.Barrel-type casing, which is compared in traditional flange, to be divided For the cylinder of face, which removes the thick and heavy flange on horizontal flange, in the startup, shutdown and variable working condition of Steam Turbine, no The excessive temperature difference can be produced between the inside and outside wall of cylinder, so as to effectively reduce the thermal stress in casing wall, can be born during acting Pressure difference it is high.

At present, barrel-type casing is public compared with the interior cylinder structure for being widely used in Steam Turbine high pressure cylinder, such as Chinese patent literature " a kind of High Pressure Inner Cylinder of Steam Turbine " opened（Publication number：CN 204386675, publication date：On June 10th, 2015）, what this article was disclosed High-pressure inner cylinder structure is a kind of similar columnar structured cylinder form.In another example " a kind of band cylinder disclosed in Chinese patent literature The Steam Turbine high-pressure section structure of shape inner casing "（Publication number：CN 105134314, publication date：On December 9th, 2015）, this article What is disclosed is that high-pressure inner cylinder uses barrel-type casing structure, but outer shell is non-tubular cylinder structure, and inner casing bearing capacity is strong, outer shell pressure-bearing Ability is then slightly inadequate.Also for example disclosed in Chinese patent literature " steam turbine structure "（Publication number：CN 102383879, it is open Day：On March 21st, 2012）, in the art, its hp outer cylinder is barrel-type casing structure, but inner casing is non-tubular cylinder structure, outside Cylinder bearing capacity is strong, and inner casing bearing capacity then relative deficiency.

In summary, in these published patent documents, only inner casing or outer shell individually use tubular cylinder structure Turbine high-pressure cylinder technology be disclosed, without by the inside and outside double shell cylinder of Steam Turbine high pressure cylinder simultaneously use barrel-type casing knot The technology of structure is disclosed, and this will be unable to efficiently solve its structural strength and steam tightness under high parameter.

The content of the invention

Technical purpose of the present utility model is：For above-mentioned the deficiencies in the prior art, there is provided a kind of structural strength height, vapour The steam turbine cylindrical high voltage cylinder that close property is good, can bear elevated pressures, be applicable to extra-supercritical unit uses.

The utility model realizes that the technical scheme that its technical purpose is used is：A kind of steam turbine cylindrical high voltage cylinder, it is described High pressure cylinder is double shell structure, with the inner casing and outer shell being set in together, and the inner casing and outer shell are respectively tubular construction；Institute Inner casing is stated mainly to be made up of the inner casing upper half and inner casing lower half of upper and lower directional combination, the inner casing upper half circumferentially combined and Inner casing lower half is integral by being sleeved on their circumferentially external multiple tracks collar connections；The outer shell is main by axial segmentation Outer shell right half and outer shell left half are constituted, and have abutted flange in the axial direction between the outer shell right half and outer shell left half, described right Multiple bolts hole are disposed with the circumference of acting flange, the outer shell being axially docking together right half and outer shell left half are on abutted flange The many connecting bolts connection connected is combined.

Preferably, the steam turbine is steam inlet condition >=35MPa supercritical turbine group.

Advantageous effects of the present utility model are：The utility model is by the inside and outside cylinder of steam turbine high-pressure cylinder respectively with cylinder Shape cylinder forming, and inner casing cylinder body upper half and cylinder body lower half with the interference fit of shrink ring closely, stably, reliably group It is fitted together, the cylinder body right half and cylinder body left half of outer shell more easily, are easily and conveniently assembled in the way of axial bolts are connected Together, the two combines integral high pressure cylinder and had both been easy to efficiently assembled formation, again the structure with high intensity and good Steam tightness, can bear higher pressure, and the use for being applicable to steam inlet condition >=35MPa supercritical turbine unit will Ask, good reliability is practical.

Brief description of the drawings

Fig. 1 is a kind of structural representation of the present utility model.

Code name implication in figure：1-inner casing；11-inner casing upper half；12-inner casing lower half；13-collar；2-outer shell； 21-outer shell right half；22-outer shell left half；23-clamping screw；3-rotor.

Embodiment

The utility model is the high pressure cylinder structure of steam turbine, and the steam turbine faces available for the super of steam inlet condition >=35MPa Technology contents of the present utility model are described in detail by boundary's Steam Turbine below against accompanying drawing 1.

Shown in Figure 1, the utility model is double-deck tubular cylinder structure, and it is with the inner casing 1 being set in together and outside Cylinder 2.

Wherein, inner casing 1 is the barrel-type casing of tubular construction-i.e., with inner casing upper half 11 and inner casing lower half 12, the He of inner casing upper half 11 Inner casing lower half 12 with upper and lower to it is circumferential coordinate be assembled on rotor 3, inner casing upper half 11 He of the circumferential combination on rotor 3 Inner casing lower half 12 is firmly attached integral, i.e. upper and lower by interference in their circumferentially external multiple tracks collars 13 Combination is connected by multiple tracks collar 13 to the inner casing upper half 11 and inner casing lower half 12 combined.

Outer shell 2 is also the barrel-type casing of tubular construction-i.e., with outer shell right half 21 and outer shell left partly 22.Outer shell right half 21 with it is interior Cylinder 1 realizes positioning, right half 21 left side of outer shell is abutted flange structure by the positioner of itself.Outer shell left half 22 leads to Cross and be connected with outer shell right half, realize the positioning of itself, left half 22 right side of outer shell is abutted flange structure, the docking Flange arrangement is provided with multiple one-to-one with the abutted flange structure matching on outer shell right half 21 in the circumference between them Bolt hole.As can be seen here, the main outer shell by axial segmentation of outer shell 2 right half 21 and outer shell left half 22 are constituted, right half 21 Hes of outer shell Have in the axial direction in abutted flange, the circumference of the abutted flange between outer shell left half 22 and be disposed with multiple bolts hole, each spiral shell It is coated with keyhole and outer shell right half 21 and outer shell left half 22 is firmly connected into integral connecting bolt 23, i.e., is axially docked at Axially connection combination exists for outer shell together right half 21 and the left half 22 many connecting bolts 23 connected on abutted flange of outer shell Together.

Above concrete technical scheme is only to illustrate the utility model, rather than its limitations.Although with reference to above-mentioned specific skill The utility model is described in detail art scheme, it will be understood by those within the art that：It still can be right Above-mentioned concrete technical scheme is modified, or carries out equivalent substitution to which part technical characteristic；And these are changed or replaced Change, the essence of appropriate technical solution is departed from spirit and scope of the present utility model.

Claims (2)

1. a kind of steam turbine cylindrical high voltage cylinder, the high pressure cylinder is double shell structure, with the inner casing being set in together（1）With it is outer Cylinder（2）, it is characterised in that：The inner casing（1）And outer shell（2）Respectively tubular construction；The inner casing（1）Mainly by upper and lower To the inner casing upper half of combination（11）With inner casing lower half（12）Composition, the inner casing upper half circumferentially combined（11）With inner casing lower half （12）By being sleeved on their circumferentially external multiple tracks collars（13）Connection is integral；The outer shell（2）Mainly by axially dividing The outer shell of section right half（21）With outer shell left half（22）Composition, the outer shell right half（21）With outer shell left half（22）Between in the axial direction With abutted flange, multiple bolts hole are disposed with the circumference of the abutted flange, the outer shell being axially docking together right half （21）With outer shell left half（22）The many connecting bolts connected on abutted flange（23）Connection is combined.

2. steam turbine cylindrical high voltage cylinder according to claim 1, it is characterised in that：The steam turbine be steam inlet condition >= 35MPa supercritical turbine group.