REACTION-TYPE STEAM TURBINE

Abstract

Embodiments of the present invention relate to a steam turbine in which unnecessary axial force is reduced. The steam turbine is capable of preventing a working fluid discharged from each nozzle-equipped rotary body from acting as resistance to the nozzle-equipped rotary bodies. The steam turbine includes a housing, a turbine shaft supported pivotably in the housing, a nozzle-equipped rotary body, and a guide panel. The nozzle-equipped rotary body is in the shape of a plurality of disks stacked along the axial direction of the turbine shaft, is integrally coupled to the turbine shaft, and has at least one or more nozzle holes formed therein so as to rotate as the working fluid is ejected. The guide panel is positioned at the rear end in a flow direction of the working fluid of the nozzle-equipped rotary body and fixed to the housing to guide the flow of the working fluid.

Claims

1. A steam turbine, comprising: a housing; a turbine shaft supported pivotably in the housing; a nozzle-equipped rotary body in the shape of a plurality of disks stacked along the axial direction of the turbine shaft, being integrally coupled to the turbine shaft and having at least one or more nozzle holes formed therein so as to rotate as the working fluid is ejected and; and a guide panel positioned at the rear end in the flow direction of the working fluid of the nozzle-equipped rotary body and fixed to the housing to guide the flow of the working fluid.

2. The steam turbine according to claim 1, wherein the guide panel comprises a panel body having a shaft hole for allowing the turbine shaft to pass therethrough and be positioned therein; and a fixing protrusion protruding from the rim of the panel body and fixed to the inside of the housing.

3. The steam turbine according to claim 2, wherein the panel body is equal to or smaller than the diameter of the nozzle-equipped rotary body located at the front end in a flow direction of the working fluid.

4. The steam turbine according to claim 1, wherein the guide panel is disposed closer to the nozzle-equipped rotary body located at the front end in the flow direction of the working fluid among two neighboring nozzle-equipped rotary bodies.

5. The steam turbine according to claim 2, wherein the guide panel is disposed closer to the nozzle-equipped rotary body located at the front end in the flow direction of the working fluid among two neighboring nozzle-equipped rotary bodies.

6. The steam turbine according to any one of claim 3, wherein the guide panel is disposed closer to the nozzle-equipped rotary body located at the front end in the flow direction of the working fluid among two neighboring nozzle-equipped rotary bodies.

Description

BRIEF SUMMARY OF THE SEVERAL VIEWS OF THE DRAWING

[0026] FIG. 1 is a partly sectional schematic view of a steam turbine according to a conventional art;

[0027] FIG. 2 is a cross-sectional structural view of a part of a steam turbine of the conventional art;

[0028] FIG. 3 is a view showing an operation flow of a nozzle-equipped rotary body and a working fluid of a steam turbine according to the conventional art;

[0029] FIG. 4 is a cross-sectional view for explaining an operation of an axial force of a steam turbine according to the conventional art;

[0030] FIG. 5 is a cross-sectional view showing a configuration of a main part of a steam turbine according to the present invention;

[0031] FIG. 6 is a plan view of the guide panel of the present invention; and

[0032] FIG. 7 is a cross-sectional view for explaining an output operation of the steam turbine according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS IN THE DRAWINGS

[0033] 110: housing

[0034] 120: turbine shaft

[0035] 130: nozzle-equipped rotary body

[0036] 131: inlet

[0037] 132: nozzle hole

[0038] 140: guide panel

DETAILED DESCRIPTION OF THE INVENTION

[0039] The specific structure or functional description presented in the embodiments of the present invention is merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms. And the present invention should not be construed as limited to the embodiments set forth herein, but should be understood to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

[0040] On the other hand, in the present invention, the terms first and/or second etc. may be used to describe various components, but the components are not limited to the terms. For example, the term, a first component may be referred to as a second component since the terms are defined only for the purpose of distinguishing one component from another component to the extent not departing from the scope of the invention in accordance with the concept of the present invention. Similarly, the second component may also be referred to as a first component.

[0041] It is to be understood that when an element is referred to as being connected or accessed to another element, it may be directly connected or accessed to the other element, but it should be understood that other elements may be present in between. On the other hand, when it is mentioned that an element is directly connected or directly accessed to the other element, it should be understood that there are no other elements in between. Other expressions for describing the relationship between components, such as between and directly between or adjacent to and directly adjacent to should also be interpreted likewise.

[0042] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms include plural expressions in meaning unless the context clearly dictates otherwise. It is to be understood that the terms include or have and the like in the specification are intended to specify the presence of stated implemented features, numbers, steps, operations, elements, parts, or combinations thereof. However, it does not preclude the presence or potential addition of one or more other features, numbers, steps, operations, elements, parts, or combinations thereof.

[0043] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0044] FIG. 5 is a schematic view of a main part of a steam turbine according to the present invention. In order to facilitate understanding, it is assumed that the working fluid is introduced from the right side, passes through each nozzle-equipped rotary body, and then is exhausted to the left side.

[0045] As illustrated in FIG. 5, the steam turbine of the present invention comprises a housing 110; a turbine shaft 120 supported pivotably in the housing 110; a nozzle-equipped rotary body 130 in the shape of a plurality of disks stacked along the axial direction of the turbine shaft 120, integrally coupled to the turbine shaft 120 and having at least one or more nozzle holes 132 formed therein so as to rotate as the working fluid is ejected; and a guide panel 140 positioned at the rear end in a flow direction of the working fluid of the nozzle-equipped rotary body and fixed to the housing 110 to guide the flow of the working fluid.

[0046] The housing 110 comprises a body portion 111, and a barrier wall 112 extending inwardly integrally from the body portion 111 to partition each nozzle-equipped rotary body 130, and the working fluid discharged from each nozzle-equipped rotary body 130 induces the flow of the working fluid to the center of the nozzle-equipped rotary body at the next stage along the barrier wall 112. Although not illustrated in drawings, the turbine shaft 120 is pivotably supported by a bearing in the housing 110.

[0047] The nozzle hole 132 is formed on the outer circumferential surface of the nozzle-equipped rotary body 130 and the nozzle hole 132 is formed in the direction of the normal line (n) of the outer circumferential surface in the present embodiment, but may be formed with an inclination in the flow direction of the working fluid.

[0048] The guide panel 140 is positioned at the rear end in the flow direction of the working fluid of each nozzle-equipped rotary body 130, and is fixed to the housing 110 to guide the flow of the working fluid.

[0049] Specifically referring to FIG. 6, the guide panel 140 comprises a panel body 141 having a shaft hole 141a for allowing the turbine shaft to pass therethrough and be positioned therein; and a fixing protrusion 142 protruding from the rim of the panel body 141 and fixed to the inside of the housing 110.

[0050] The panel body 141 is in the shape of a circular disk, and a shaft hole 141a is formed in the center. Accordingly, the turbine shaft 120 passes through the shaft hole 141a and is positioned therein.

[0051] Preferably, the diameter 2r of the panel body 141 is at least equal to or smaller than that of the nozzle-equipped rotary body that is located at the front end in the flow direction of the working fluid.

[0052] The size of the panel body 141 can be determined in consideration of the separated distance from the nozzle-equipped rotary body located at the front end. Since the working fluid ejected from the nozzle-equipped rotary body is moved to the nozzle-equipped rotary body at the next stage by the guide panel 140 positioned at the rear end, it does not act as resistance to the nozzle-equipped rotary body.

[0053] The fixing protrusion 142 protrudes radially from the rim of the panel body 141 and is fixed to the inner circumferential surface of the housing 110. The fixing protrusion 142 may be fixed to the housing by welding, or a groove may be formed in the housing such that the fixing protrusion is inserted and fixed.

[0054] FIG. 7 is a cross-sectional view for explaining the operation of the steam turbine according to the present invention.

[0055] As illustrated in FIG. 7, the guide panel 140 is disposed more adjacent to the nozzle-equipped rotary body located at the front end in the flow direction of the working fluid among two neighboring nozzle-equipped rotary bodies (d1<d2). Accordingly, most of the working fluid ejected from the nozzle-equipped rotary body 130 moves to a space between the barrier wall 112 and the guide panel 130 to reduce the friction loss due to the flow with the corresponding nozzle-equipped rotary body 130.

[0056] Referring to FIG. 7, the points of flow path affecting the surface of a wall of the nozzle-equipped rotary body 130 are 1, 2, 3, 4, 5, 7, and 9, and the static pressure of the fluid at points 8 and 10 through which most of the working fluid passes is irrelevant to the nozzle-equipped rotary body 130 due to the guide panel 140 fixed to the housing 110.

[0057] In addition, the amount of the working fluid flowing into the space between the nozzle-equipped rotary body 130 and the guide panel 140 can be adjusted appropriately according to the installation position of the guide panel 140 (the separated distance from the nozzle-equipped rotary body) Accordingly, the guide panel 140 is fixedly installed at a position where the thrust of the turbine shaft 120 can be minimized by calculating the thrust direction and the magnitude (Ft: the resultant force of F1, F2, and F3) of the nozzle-equipped rotary body 130.

[0058] Further, according to the present invention, the working fluid ejected from the nozzle-equipped rotary body 130 blocks contact with the nozzle-equipped rotary body 130 to minimize the friction loss due to the flow, thereby reducing unnecessary load of the axial force on the turbine shaft. Accordingly, the load in the axial direction of the bearing element supporting the turbine shaft is decreased to minimize life-span reduction due to the mechanical loss of the bearing element.

[0059] On the other hand, the ejecting powers of the working fluid of the nozzle-equipped rotary body composed of multiple stages are not substantively identical to one another. Accordingly, the separated distance between the nozzle-equipped rotary body and the guide panel disposed at the rear end of each nozzle-equipped rotary body may be different from one another by reflecting the ejecting power of each nozzle-equipped rotary body.

[0060] It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the following claims.