JPS6185540A - Fluid sealing equipment for turbomachine - Google Patents

Abstract

PURPOSE:To remarkably decrease the amount of fluid leak between a revolving part and a stationary part by installing a restricting member on one side-part in the axial direction of a non-contact seal part in such a manner that the restricting member is integrated into one body with the revolving part. CONSTITUTION:A labyrinth packing 15 whose fluid passage is zigzag is formed by both projected parts 12, which are projected in a ring-shape from the peripheral surface 11a a revolving part 11, and throttle-pieces 14, which are projected in a ring-shape from the inner surface 13a of a stationary part 13. Flow restricting members 17 are made up of many blade-shape projected members installed on the peripheral surface of the revolving part 11, and their blade angles are determined so that the flow from a low pressure chamber side 18 to the labyrinth packing 15 side is produced. On the stationary part 13 situated on the downstream side of the flow (marked by an arrow mark A) produced by the restricting members 17, a plurality of fluid passages 19, which let the discharged fluid (steam) compressed by said flow run toward the suction side of the flow restricting members, are formed in the circumferential direction at a regular interval.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a fluid sealing device for a turbomachine such as a steam turbine or a gas turbine. The present invention relates to a fluid seal device for a turbomachine.

[Technical background of the invention and its problems]

For example, in the gap between the outer circumferential surface of a row roller and the inner circumferential surface of a coosing located between each stage of a steam turbine, or the gap between the outer circumferential surface of a notch and the inner circumferential surface of a coushing, differential pressure is created in the axial direction and It is well known that a fluid seal device for sealing a gap between adjacent chambers by using a non-contact fluid sealing member such as a labyrinth seal is well known. Such a seal 8m has ring-shaped throttle pieces protruding from either the outer circumferential surface of the rotating part or the inner circumferential face of the stationary part (for example, in the axial direction, facing each other in the axial direction), and one end of the throttle. A narrow space is formed in the section, and the space between the throttle pieces is used as an expanding seedling, creating a flow path resistance for the fluid meandering between the narrow space and the expansion chamber, thereby creating a flow path between the adjacent compartment spaces. It is designed to prevent fluid leakage.

However, in order to sufficiently reduce the leakage m and improve the sealing effect, it is desirable to make the narrow space formed at the tip of the throttle piece small, but this space is extremely small. In this case, accidents are likely to occur where the tip of the throttle piece comes into contact with the opposing surface, and for this reason, the conventional method has been to reduce the space within a range that does not cause contact accidents, and as a result, the sealing effect is subject to certain restrictions. There was a problem that it was difficult to obtain a complete seal of 2JJ Song.

In addition, conventionally, for example, as shown in FIG. 13, a diaphragm piece 1 as a labyrinth packing is provided with a slope such that its tip side is tilted toward the g+fL side and protrudes from the outer circumferential surface of the rotating part 2, and the rotating part 2 and the stationary part are connected to each other. There is also a system that aims to reduce the amount of leakage by increasing the resistance of the flow path between 3 and 3.

However, such a configuration is time-consuming and time-consuming to manufacture, and there remains a limit to the sealing effect due to the contact accident mentioned above, making it impossible to achieve particularly modest performance improvements.

(Objective of the Invention) The present invention has been made in view of the above circumstances, and has a relatively simple structure that allows the connection between the rotating part and the stationary part without causing adverse effects such as contact accidents. The purpose of this invention is to provide a highly reliable turbomachinery fluid sealing device that can significantly reduce or eliminate fluid leakage.

[Summary of the idea]

In order to achieve the above object, the present invention has a plurality of chambers through which fluid passes between the rotating part and the static +L part surrounding it.
A 14-bottle fluid seal that is partitioned in the direction and seals between a rotating part and a stationary part, which are located between all phases n that are responsible for the fluid pressure adjacent to each other, with a non-contact seal part made of fluid. In the device, a blade-like flow generator capable of causing a flow on at least one side in the axial direction of the non-contact seal portion to remove the differential pressure between both sides of the seal portion can be rotated integrally with the rotating portion. 1' that it rang 1 or 2! + r
It is set as l.

C name, Example of γ) Ichi, N1 (See Figures 1 to 4 for an example of 75 plans)
H;H (explain).

1 and 2 show a gland seal portion of, for example, a steam turbine, which constitutes a wax seal serving as a non-contact seal portion. That is, times φl+:
' is formed.

A narrow space 16 is formed on the downstream side of the labyrinth packing 15, on the lower pressure side, in which the inner circumferential surface 13a of the stationary part 13 is brought close to the outer circumferential surface of the rotating part 11.

The flow regulating member 17 is installed within this space. Flow) The A sub-member 17 is a blade-shaped member protruding from the outer peripheral surface of the rotating part 11, and the angle of the blades causes a flow to flow from the low pressure chamber 18 side to the labyrinth packing 15 side. In other words, the setting is such that the labyrinth packing 15 side is pressurized.

Furthermore, the stationary part 13 located downstream of the flow (arrow A) caused by the flow regulating member 17 allows discharged fluid (vapor) pressurized by the flow to flow out to the suction side of the flow regulating member. A plurality of channels 19 are formed at intervals in the circumferential direction.

As shown in FIGS. 3 and 4, the flow regulating member 17 is arranged at a predetermined angle with respect to the axis of the rotating part 11. Insert a blade-shaped flow guide aI+1 member main body 17' separate from the rotating part 11 into the plurality of fillers 20 formed in step 1, respectively, and add a pair of adjacent elements of the surface portion of the rotating part 11 to the adjacent 7;Ii 11' is caulked and fixed to the constriction of the flow guide a111 member body 17'.

According to the fluid sealing device for a turbo-engineering machine according to the embodiment as described in 1.1-(b), fluid such as gland steam is sealed in the labyrinth packing 15 on the high pressure side (the first from the left side of the first cause) to the low pressure side (ffi on the right side of the figure)
! I ), the rotation of the rotating part 11 is Φ1
1 J mm, flow current 1111 member 17 flows, 1 set) 7 flow A is generated and labyrinth packing 1
As a pressure increase occurs on the low pressure side of the labyrinth packing 15, the differential pressure between both sides of the labyrinth packing 15 in the axial direction is reduced, and fluid leakage is reduced. J5, flow regulating member 1
The flow Δ generated in step 7 returns i through the flow path 19, and the pressurizing action i becomes more stable.

Flowing! From the relationship between the pressurizing force by the Ij part U17 and the pressure reducing effect by the flow path 19, if the pressure applied to 11 of the labyrinth seal 15 is equal to the pressure of the leakage flow to the pressure side), the pressure on both sides of the labyrinth seal 15 will be pressure difference is removed,
A state of equilibrium is reached and there is no fluid leakage.

J5, in order to reduce the fluid pressure loss of main steam etc. caused by the flow regulating member 17 (in order to reduce the space in which the flow regulating member 17 is provided, the diameter of the flow path 19 is reduced and All you have to do is reduce the flow rate.

Note that the flow regulating portion $117 is the if h+ of the above embodiment.
.

Various arrangements can be made. For example, as shown in FIG. 5 J5 and FIG. 6, the flow current υj member system 17
It is also possible to have a fixed structure in which a hole 22 is provided at the rotating part insertion portion of the rotating part 11 ( ), and a pin 23 press-fitted from the end face of the rotating part 11 is inserted into the hole 22 .

In addition, as shown in FIGS. 7 to 10, a flow regulating member string 17 in the shape of an aperture ring along a plane orthogonal to the axis of the rotating section 11 is installed in advance, either integrally or separately, in the rotating section 11.
' may be formed and later sung at a predetermined angle.

In addition, according to the present invention in which the flow control flint member 17 is provided, the pressure difference on both sides of the non-contact fluid seal can be removed. For example, as shown in FIG. This method can also be applied to a device composed of only one sheet, and even in this case, fluid leakage can be sufficiently suppressed.

yo/, -1 In each of the above embodiments, the flow regulating member 17 is
Although the case has been described in which it is placed in the 1st Z of the fijll, it may be placed in the high pressure side chamber as shown in No. 1211.

this! ) ; If so, lower the labyrinth seal measurement)
Then, the angle of the wing (fz mountain) is set so that the new ij1 entry B is directed toward the L flow side.
Part 15 of Ninichi! IIJ: Low pressure on both sides;
There is a method C in which the pressure is removed to prevent leakage in the same manner as in the previous embodiment.

As described above, if the fluid seal device for the turbo region according to the present invention has J, at least the contact seal portion of the shaft/j
Opposite side: A blade-shaped flow regulation that causes a flow to remove the 4 red between both sides of the seal part.1111
Since the 4υ1 rotation part and f were installed so that they could not rotate,
Non-1 >"Fr, l! Flow 1 to solve the seal part differential pressure Wj without the need to form an overcurrent part with Ig+throttle piece", sjAE j/) 14 Also, decrease this (,
1 can be eliminated at all〈:'A reliable sealing device from 1'' that has no risk of mechanical contact accidents can be obtained with a simple configuration by adding a blade-like member to 11. Qin will be conquered.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is an enlarged view of Fig. 2 showing the flow regulating member. Figure 4 is a sectional view taken along the line ■-■ of Figure 3, Figure 5 is an enlarged view of the main part showing an example in another embodiment 1, Figure 6 is a side view of Figure 5, and Figure 7 is a still further example. A front view showing an example, FIG. 8 is a sectional view taken along the line ■-■ of FIG. 7, FIG. 9 is a plan view of FIG. 7, FIG. 10 is a sectional view taken along the line X--X of FIG. 9, and FIG. FIG. 12 is a sectional view showing a significantly different embodiment, FIG. 12 is a sectional view showing still another embodiment, and FIG. 13 is a sectional view showing a subordinate example. 11...Rotating part, 13...Stationary part, 15...Non-1
8 Touch seal portion (labyrinth seal), 17...Flow regulating member. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (4)

[Claims] 1. A plurality of chambers through which fluid passes are defined in the axial direction between the rotating part and a stationary part surrounding it, and fluid flows between the rotating part and the stationary part located between adjacent chambers with different fluid pressures. In a fluid seal device for a turbomachine that seals with a non-contact seal part, a vane-like structure is used that causes a flow to occur on at least one axial side of the non-contact seal part to remove the differential pressure between both sides of the seal part. A fluid sealing device for a turbomachine, characterized in that a flow regulating member is provided so as to be rotatable integrally with the rotating portion. 2. The flow regulating member is disposed in a chamber on the low pressure side and has a vane angle that pressurizes the fluid seal portion side, and a stationary portion adjacent to the flow regulating member receives the discharged fluid pressurized by the flow regulating member. The fluid seal device for a turbomachine according to claim 1, wherein a flow path is formed on the suction side of the flow regulating member. 3. 2. The fluid seal device for a turbomachine according to claim 1, wherein the flow regulating member is disposed in a chamber on the high pressure side and given a vane angle to reduce pressure on the fluid seal portion side. 4. 2. The fluid sealing device for a turbomachine according to claim 1, wherein the flow regulating member is formed integrally with the rotating part or as a separate part.