JPS586043B2 - Connection device between casing and bearing stand - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a coupling device between a turbine casing and a bearing stand.

In a turbine, the casing and rotor become hot due to the flow of high-temperature gas inside the turbine, causing thermal expansion.

In response to the thermal expansion of the rotor, the casing and the bearing pedestal are moved using the thermal expansion of the casing with respect to the fixed bearing pedestal, and the thrust bearing metal provided on one bearing pedestal moves the casing and the bearing pedestal. The thrust collar provided on the shaft of each shaft is supported, and this serves as the reference point for the relative position of the rotor, casing, and bearing stand, and the thermal expansion of the rotor and the casing are offset, and the fixed blades and rotating blades The axial clearance between the shaft and the radial bearing, the axial clearance of the labyrinth packing, and the axial clearance of the radial bearing are ensured.

A coupling device is provided between the bearing pedestal and the casing in order to move the casing and the bearing pedestal using thermal expansion of the casing with respect to the fixed bearing pedestal.

The coupling device also determines the lateral position of the housing with respect to the bearing pedestal.

FIG. 1 is a side view of a turbine provided with a longitudinal coupling device, and FIG. 2 is a plan view of FIG. 1.

The bearing stand 1 is fixed on a plywood board, and the bearing stands 2 and 3 are arranged on the plywood board so as to be movable only in the axial direction of the shaft 4.

The casings 5, 6 each have two support arms 5A, 5B, 6A. 6B is casing 5
, 6.

The cradle IA, 2B, 2A provided on the bearing pedestal 1, 2, 3,
The support arms 5A, 5B, 6A, and 6B are respectively placed on the support arms IA, 2B, 2A, and 3B.
, 6 is supported, and the upper and lower positions of the casings 5, 6 are determined.

Connecting devices 7A, 7B, 8A, 8B are provided between the housings 5, 6 and the bearing pedestals 1, 2.3.

The coupling devices 7A, 7B, 8A, 8B determine the lateral positions of the casings 5, 6 with respect to the bearing pedestals 1, 2, 3, and the axial direction of the casings 5, 6 between the bearing pedestals 1, 2, 3 and the casings 5, 6. casings 5 and 6 as described above.
The thermal expansion of the casing 5,
6 and the bearing stands 2 and 3 are moved.

Next, the structure of the vertical coupling device will be explained.

FIG. 3 is a partial sectional view taken along the line ■--■ in FIG. 1.

The coupling device 7B includes a concave guide part 9 attached to the casing 5 and provided with a T-shaped groove, and a convex guide part 1 attached to the bearing stand and formed in a T-shaped protrusion.
0, and adjustment plates 11 and 12 that fit into the gap created when the T-shaped protrusion of the convex guide component 10 is fitted into the T-shaped protrusion of the concave guide component 9.

The thickness of the adjustment plate 11 determines the lateral position of the casing 5 with respect to the bearing pedestal 2, and the adjustment plate 12 determines the relative position of the casing 5 and the bearing pedestal 2 in the axial direction.

Therefore, when the bearing stand 2♂ casing 5 is placed in the normal relative position, the thickness is adjusted to match the gap between the T-shaped groove of the concave guide part 9 and the T-shaped protrusion of the convex guide part 10. Adjustment plates 11 and 12 were made respectively.

Although the connection device 7B has been described above, the connection devices 7A and 8A
, 8B.

As described above, the vertical coupling device has disadvantages in that it is expensive and requires a long time to assemble the turbine because the adjustment plate is manufactured by assembling the actual adjustment plate.

This invention eliminates the above-mentioned drawbacks, is inexpensive,
Another object of the present invention is to provide a coupling device that can shorten the assembly time of a turbine.

According to the present invention, the above-mentioned object includes:
A threaded rod fixed to the axial protrusion of the casing and extending perpendicularly to the axial direction and loosely penetrating the axial protrusion of the bearing pedestal, the axial protrusion of the bearing pedestal being appropriately fastened to the threaded rod. a nut, a lateral protrusion that protrudes from the side surface of the bearing pedestal at right angles to the axial direction, a threaded rod that protrudes axially from the end face of the casing and loosely passes through the lateral protrusion of the bearing pedestal, and the side of the bearing pedestal. This is achieved by constituting the directional projection from a nut which is suitably fastened to the axially threaded rod of the casing.

Embodiments of the present invention will be described below based on the drawings.

FIG. 4 is a partial sectional view showing a connection device between a casing and a bearing stand according to an embodiment of the present invention.

Two rods 27A and 27B, each having a thread 26A and 26B at their tips, are mounted horizontally and at right angles to the axial direction on both sides of an axial protrusion 28 provided at the end of the casing 25. installed in a straight line.

At the end of the bearing stand 22, there are screws 2 of rods 27A and 27B.
Protrusions 29A and 29B protruding in the axial direction are provided at positions corresponding to 6A and 26B.

These axial projections 29A, 29B have rods 27A.
, 27B and through which the rods 27A, 27B can be freely moved in the axial direction.

The rods 27A and 27B are passed through the holes, and the threaded rod 26
A, 26B and two nuts 30A, 30B, the axial projections 29A, 29B and the rods 27A, 27B
has been concluded.

In addition, screws 31A and 31B are formed at the tips of the 2
Two threaded rods 32A, 32B are attached to the ends of the casing 25 in parallel to the axial direction.

On both sides of the bearing stand 22, there are lateral protrusions 3 protruding at right angles to the axial direction at positions corresponding to the threaded rods 32A and 32B.
3A and 33B are provided.

The lateral protrusions 33A, 33B are provided with holes through which the rods 32A, 32B can pass and which allow freedom of movement in the horizontal direction at right angles to the axial direction of the rotor.

Threaded rods 32A, 32B are passed through the holes, and screw 31A
, 31B and two nuts} 34A, 34B, the lateral protrusions 33A, 33B and the threaded rods 32A, 32
B has been concluded.

As described above, this coupling device determines the lateral position of the casing 25 with reference to the bearing pedestal 22, and maintains the axial relative position of the bearing pedestal 22 and the casing 25.
Each of the above positions includes threaded rod λ, 26B and nut 3CIA
, 30B, and a combination of threads 31A, 31B and nuts 34A, 34B.

Therefore, unlike the conventional method, there is no need to manufacture the adjusting plate by matching the actual parts, and the threaded rod can be manufactured at low cost, resulting in low cost and shortening the assembly time of the turbine.

[Brief Description of the Drawings] Figure 1 is a side view of a turbine equipped with a conventional coupling device, Figure 2 is a plan view of Figure 1, and Figure 3 is a section taken along line 1-1 in Figure 1. FIG. 4 is a partial sectional view showing a connection device between a casing and a bearing pedestal according to an embodiment of the present invention. 1, 2, 3, 22: Bearing stand, IA, 2A, 2B, 3B:
Cradle, 4: Shaft, 5, 6, 25 casing, 7A, 7B
, 8A, 8B: Connection device, 26A, 26B 31A, 31
B: Threaded rod, 28: Axial protrusion of casing, 29A
, 29B: Axial protrusion of bearing stand, 30A, 30B, 3
4A, 34B: Nut, 33A, 33B: Lateral protrusion of bearing stand.

Claims (1)

[Claims] 1. An axial protrusion provided on opposing end surfaces of the casing and the bearing pedestal, which is fixed to the axially protruding lip of the casing, extends perpendicular to the axial direction, and loosely passes through the axial protrusion of the bearing pedestal. a threaded rod for fastening the axially protruding portion of the bearing pedestal to the threaded rod, a lateral protruding portion that protrudes from the side surface of the bearing pedestal at right angles to the axial direction, and a lateral protruding portion that protrudes from the end of the casing in the axial direction. A bearing holder with a casing, comprising: a threaded rod that loosely passes through the lateral protrusion of the bearing pedestal; and a nut that appropriately fastens the lateral protrusion of the bearing holder to the axial threaded rod of the casing. connection device with.