JPS6111403A - Blade of multilayer structure for fluid reversion in rotary machine - Google Patents

Abstract

PURPOSE:To decrease the axial length of a single-stage axial flow turbine, by forming a moving blade of this turbine to be multilayer, through a dividing plate. CONSTITUTION:A dividing plate 6 is set in a moving blade of a single-stage axial flow turbine, so as to make the moving blade multilayer 1, 1', working fluid is reversed at each of the layers 1, 1', and stationary blades 4, 4' are set on the upper stream of the layers 1, 1' respectively. The working fluid which flows in through an inlet (a), streams through the stationary blade 4, the moving blade 1, another stationary blade 4', and another moving blade 1' in due order, and is exhausted from an outlet (b). In this way, as the work of a two-stages axial flow turbine can be done by this single-stage axial flow turbine, the axial length can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is used in the technical field of reducing the axial length of rotating machines such as steam turbines, gas turbines, blowers, compressors, etc.

BACKGROUND ART An overview of the conventional type will be described with reference to FIGS. 8 to 11.

FIG. 8 shows an example of the configuration of the rotating shaft and rotor blades of a conventional three-stage axial flow turbine.

Here, 01, 01/ and ol" indicate the rotor blades, and o2 indicates the rotation axis. This example is for a turbine, and in this example, the steam flows from the left of FIG. flows in the direction of

In addition, the airfoil is the nn cross section of 01, the mm cross section of OII,
The IV-IV cross section of 01" is shown in FIGS. 9 to 11, respectively.
3 indicates the direction in which lift is generated.

When steam flows from the left in Figure 8 in the direction of arrow a, a lift force acts on the blade cross section, causing the turbine shaft to rotate in the θ direction in Figure 8.
Thermal energy is converted into rotational energy. In this case, since the structure is such that steam flows from the left in the figure in the direction of the arrow, the turbine has to have a long structure in the X direction of the figure. Depending on the application, the long length in the X direction may be a disadvantage.

Problems to be Solved by the Invention The present invention provides a rotating machine having the structure as described above.
The object of the present invention is to reduce the length in the axial direction (X direction in FIG. 8) of a multistage axial flow machine, and to realize an axial flow rotary machine that is compact in the axial direction.

Means for Solving the Problems The present invention takes the following measures in order to solve the above-mentioned problems. In other words, the rotor blades of a single-stage axial flow turbine are formed into multiple layers with partition plates interposed between them, and the stator blades are formed on the upstream side of the rotor blades in each layer, and the casing is designed so that the working fluid is reversed in each layer. form.

Effect: According to the means described above, it is therefore possible to realize an axial flow rotary machine that is compact in the axial direction.

Embodiment Next, a first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3, and a second embodiment will be described in detail with reference to FIGS. 4 to 7.

In the cross-sectional view of FIG.
A rotor blade 1/ is provided.

Reference numeral 4 denotes a stationary blade, which is arranged between casings 3 and 3' forming a flow path upstream of the rotor blade 1.

3'' is a casing formed so that the driving fluid is reversed, and a second stationary blade 4/ fixed to the casing 3'' is provided upstream of the second rotor blade 1/.

FIGS. 2 and 3 show cross sections taken along lines v-V and Vl-■ in FIG. 1, and the arrows at the bottom of the figures indicate the direction of steam flow.

Steam is introduced from B), reversed as shown by arrows 5, 5' and 5'', and discharged to B).
, stator blade 4', and rotor blade 1' as shown in FIGS. 2 and 3 in this order (
, steam flows and generates the lift shown in Ll in FIG. 2 and Nori in FIG.

In other words, the single-stage, two-layer flow turbine shown in FIG. 1 can perform work comparable to that of an axial-flow two-stage turbine.

Further, 6 in FIG. 1 is a partition plate between the two laminar flows.

This makes it possible to realize an axial flow rotary machine that is compact in the axial direction.

Further, since it is an inverted structure, the thrust unbalance 2 is small, so there is an advantage that the thrust bearing load can be small.

Next, a second embodiment will be described with reference to FIGS. 4 to 7.

The second embodiment shown in the sectional view in FIG.
Layered rotor blades 1'' are stacked with partition plates 6' interposed therebetween, and a casing 3'' is provided on the upstream side of the rotor blades 1'' to further reverse the working fluid after passing through the rotor blades 1/. A third stationary blade 4'' is disposed in the casing 3'', and the rotor blade l'' is located downstream thereof.

Figures 5 to 7 are cross sections of Figure 4.■-■, ■-■, IK-
This diagram corresponds to (2).

Steam is introduced from A) and arrows 5.5/, 5”, 51
It is reversed and discharged as shown in (vl). Meanwhile, the stator blades 4, rotor blades 1, stator blades 4/, rotor blades 1/, stator blades 4'', rotor blades 1
The steam flows in the order shown in Figures 5 to 7, generating lift on the rotating rotor blades as shown in L□ in Figure 5, L in Figure 6, and L0 in Figure 7, causing the rotor to rotate. Rotate shaft 2.

In other words, the single-stage three-layer flow turbine shown in FIG. 4 can perform the same work as the three-stage axial flow turbine. In addition, 6.61 in FIG. 4 is a partition plate between each layer of the three-layer flow.

Regarding the third embodiment, although not shown, any multilayer axial flow turbine having four or more layers, which can be easily imagined from FIGS. 1 and 4, is also considered.

In addition, in the above description, the multilayer structure includes all layered structures of two or more layers and any number of layers.

Effects of the Invention According to the configuration described above, the single-stage two-layer flow turbine shown in FIG. 1 and the single-stage three-layer flow turbine shown in FIG. 4 can perform the same work as an axial flow two-stage or three-stage turbine. , the axial length of a multistage axial flow machine can be reduced, and a rotating machine that is compact in the axial direction can be realized.

[Brief explanation of drawings]

1 to 3 show the first embodiment of the present invention, FIG. 1 is a sectional view showing the structure, FIG. 2 is a sectional view taken along the line ■-V of FIG. 1, and FIG. A cross-sectional view of line M-■ from Fig. 4.
The figures show the second embodiment, FIG. 4 is a sectional view showing the structure, FIG. 5 is a sectional view taken along the line ■-■ in FIG. 4, and FIG.
7 is a sectional view taken along the line IX-IX in FIG. Cross section of ■-■ line, 1st
0 is a cross-sectional view taken along the line ■--■ in FIG. 8, and FIG. 11 is a cross-sectional view taken along the line IV--IV in FIG. 1.1', 1"...Rotating blade, 2...Rotating shaft, 3,3'. 3"Sound/Casing, 4, 4', 4"...Stator blade,
5, 5'. 5"... Steam flow direction, 6.6'... Partition plate. Fig. 1 1.1'... Motion W 2... Rotation # axis Fig. 2 V-V sectional view 1-■- Prayer surface drawing 4 Figure ■ - YIIIC Bamboo Figure 8 Front view Figure 10 Figure 11 n-: rx@hV NN-11r[ll-f
f cutting + Ml Figure 7 Ba＼TK＠? fD diagram

Claims (1)

[Claims] The rotor blades of a single-stage axial flow turbine are formed into multiple layers with partition plates interposed between each rotor blade, a stationary blade is formed on the upstream side of the rotor blade in each layer, and a casing is formed in each layer to reverse the working fluid. A fluid-inverted multilayer blade for rotating machinery.