CN115522994A - A taper sleeve connection structure at the shaft end of a marine steam turbine generator set - Google Patents

Abstract

The invention relates to a shaft end taper sleeve connection structure of a marine steam turbine generator set, which includes a flange and a rotating shaft. The bulging interference connection provides a tight fit and transmits torque. The invention adopts conical shaft extension and hydraulic bulging interference connection structure, which simplifies the installation process, and the installation and disassembly process is no longer limited by the site; the shaft end connection structure has good interchangeability, and the connection structure is faulty. In this case, the effective utilization rate of the shaft body is effectively improved; the unbalance of the shaft end connection structure itself is eliminated from the source, and the vibration control of the overall shaft system is effectively improved.

Description

A taper sleeve connection structure at the shaft end of a marine steam turbine generator set

technical field

The invention relates to a marine steam turbine generator set, in particular to a shaft end taper sleeve connection structure of a marine steam turbine generator set.

Background technique

The shaft end connection structure of the steam turbine generator set is used to connect the shaft of the steam turbine and the shaft of the generator, and transmit the power of the steam turbine to the generator. The traditional shaft end connection structure is hinged bolts, or the combination of micro-interference and flush pins, see Figure 2. The hinged bolt structure, as shown in Figure 1, during the assembly process of the unit, each bolt needs to be ground one-to-one according to the matching reaming hole, the entire installation process is complicated, and due to the diameter and position of each screw hole Not the same, resulting in basically no interchangeability between different products. The combined use of micro-interference and seam pins requires shrink fit and matching seam pins during the assembly process. The entire installation process is also relatively complicated, and the flanges of the seam pins and shrink fit are not easy to operate during disassembly. remove. On the other hand, the traditional structure uses connecting bolts and pins in the connection between the shaft and the flange. Due to the deviation of the installation angle of the parts and its own weight, the entire connection structure cannot completely eliminate the existence of unbalanced mass in the circumferential direction, which is not conducive to Optimal control of unit shafting vibration.

Contents of the invention

In order to solve the problems existing in the prior art, the present invention proposes a conical sleeve connection structure at the shaft end of a marine steam turbine generator set, which adopts a conical shaft extension and a hydraulic bulging interference connection. The transmission load is large. With the use of special tooling, this structure can easily realize the disassembly and assembly of the shaft end connection structure, and is no longer limited by the site constraints; secondly, the structure no longer has the situation of matching, and the parts of different products are processed according to the drawings, that is, It can be interchanged; finally, due to the cancellation of the connection bolts and pins with the rotor body, the existence of unbalanced mass is eliminated from the source, and the optimal control of shafting vibration is realized.

In order to achieve the above object, the technical solution of the present invention is: a shaft-end taper sleeve connection structure of a marine steam turbine generator set, including a flange and a rotating shaft, the inner tapered surface of the flange is matched with the outer tapered surface of the rotating shaft, In addition, tapered shaft extension and hydraulic bulging interference connection are used to achieve tight fit and transmit torque.

Further, the contact taper surface between the rotating shaft and the flange is a 1:20 taper surface.

Further, an annular oil groove is formed on the conical surface of the rotating shaft, and the annular oil groove is connected to radial oil ports arranged symmetrically in the rotating shaft, and the radial oil ports are connected to threaded holes on the end surface of the rotating shaft.

Furthermore, during the installation process, high-pressure hydraulic oil enters the interior of the shaft 1 through the threaded hole at the shaft end of the shaft, enters the annular oil groove contacting the tapered surface through the symmetrically arranged radial oil ports, and applies hydraulic pressure to open the inner hole of the flange. Then the interference assembly between the flange plate and the rotating shaft is realized.

Further, the symmetrically arranged radial oil ports are a single group of radial oil ports, or two groups of radial oil ports.

The beneficial effects of the present invention are:

The invention simplifies the installation process through the design of the new tapered shaft extension and hydraulic bulging interference connection structure, and the installation and disassembly process is no longer limited by the site; the shaft end connection structure has good interchangeability, and the connection In the case of structural failure, the effective utilization rate of the shaft body is effectively improved; the unbalance of the shaft end connection structure itself is eliminated from the source, and the vibration control of the overall shaft system is effectively improved.

Description of drawings

Fig. 1 is a schematic diagram of a conventional shaft end connection structure (hinge bolt);

Figure 2 is a schematic diagram of a conventional shaft end connection structure (combined use of micro-interference and flush pin);

Fig. 3 is the tapered shaft extension and hydraulic bulging interference connection structure of the present invention;

Fig. 4 is a schematic diagram of the structure of a single group of oil circuits;

Fig. 5 is a schematic diagram of the structure of the double-group oil circuit.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Fig. 3, a taper sleeve connection structure at the shaft end of a marine steam turbine generator set of the present invention adopts a conical shaft extension and a hydraulic bulging interference connection, and the flange 1 is connected to the rotating shaft 2 through an inner tapered surface. The inner tapered surface of the flange 1 and the rotating shaft 2 realize tight fit through interference and transmit torque.

In this structure, the contact surface between the shaft end of the rotating shaft 2 and the flange 1 is a 1:20 conical surface, and the outer surface of the rotating shaft and the inner surface of the flange are respectively processed based on a set of standard plug rings. During the assembly process, the pushing distance of the flange is strictly controlled, and the contact surface is colored and inspected to control the actual assembly interference and assembly quality.

An annular oil groove 5 is opened on the conical surface of the rotating shaft 1 , and the annular oil groove 5 communicates with radial oil ports 4 arranged symmetrically in the rotating shaft 1 , and the radial oil ports 4 communicate with the threaded holes 3 on the end surface of the rotating shaft 1 .

During the installation process, high-pressure hydraulic oil enters the interior of the shaft 1 through the threaded hole 3 at the shaft end, and enters the annular oil groove 5 contacting the tapered surface through the symmetrically arranged radial oil port 4, thereby applying hydraulic pressure to open the inner hole of the flange , and then realize the interference fit between the flange and the shaft.

Considering that the size of the flange is too large, a single set of radial oil ports 4, as shown in Figure 4, can be increased to two sets of radial oil ports 4 according to the actual situation, as shown in Figure 5, different oil ports are on the tapered shaft extension The uniform arrangement makes the inner hole expand evenly, which facilitates the smooth assembly of the flange plate 1 and the rotating shaft 2 .

Claims (5)

1. A shaft-end taper sleeve connection structure of a marine steam turbine generator set, characterized in that: it includes a flange and a rotating shaft, the inner tapered surface of the flange is matched with the outer tapered surface of the rotating shaft, and a tapered shaft is used Stretching, hydraulic bulging interference connection to achieve tight fit and transmit torque. 2. The taper bushing connection structure at the shaft end of the marine turbogenerator set according to claim 1, characterized in that: the contact tapered surface between the rotating shaft and the flange is a 1:20 tapered surface. 3. The taper bushing connection structure at the shaft end of the marine steam turbine generator set according to claim 1, characterized in that: the conical surface of the rotating shaft is provided with an annular oil groove, and the annular oil groove is connected to the symmetrically arranged radial oil ports in the rotating shaft , the radial oil port is connected to the threaded hole on the end face of the rotating shaft. 4. The taper sleeve connection structure at the shaft end of the marine steam turbine generator set according to claim 3, characterized in that: during the installation process, high-pressure hydraulic oil enters the interior of the shaft 1 through the threaded hole at the shaft end of the shaft, and the symmetrically arranged The radial oil port enters into the annular oil groove contacting the tapered surface, and hydraulic pressure is applied to expand the inner hole of the flange, thereby realizing the interference assembly between the flange and the rotating shaft. 5. The taper sleeve connection structure at the shaft end of the marine steam turbine generator set according to claim 3, characterized in that: the symmetrically arranged radial oil ports are a single set of radial oil ports, or two sets of radial oil ports .

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