CN-122014659-A - Shaft-added fan bearing box vibration temperature cooperative control method and bearing box thereof

CN122014659ACN 122014659 ACN122014659 ACN 122014659ACN-122014659-A

Abstract

The invention relates to the technical field of control of auxiliary equipment of steam turbines, in particular to a method for cooperatively controlling the vibration temperature of a bearing box of a shaft blower and a bearing box thereof, which adopts a lightweight shaft blower impeller to perform dynamic balance correction on the lightweight impeller, a bearing box shell is arranged on a mounting surface, two groups of rolling bearings are arranged in the bearing box shell, a lubrication sealing assembly is arranged on the bearing box shell, the impeller is connected to the output end of the bearing box shell, the cooling system is arranged on the bearing box shell, when the temperature of the bearing box shell or the rolling bearing in the bearing box shell exceeds a second set value, the cooling system starts to cool the bearing box shell or the rolling bearing, so that the automatic closed-loop control of the rolling bearing and the temperature of the bearing box is realized, and the problems of exceeding of vibration standard of the existing shaft and the fan, frequent bearing faults, lack of effective cooling and high maintenance cost and the technical problems are solved.

Inventors

WANG LIECHENG
ZHANG SHIHUI
Wang Cailue
WANG FENG
YANG RENDONG
TIAN QINGLIN

Assignees

国能长源汉川发电有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. The method for cooperatively controlling the vibration temperature of the bearing box of the shaft plus fan is characterized by comprising the following steps of: s100, adopting a light shaft and a fan impeller, and carrying out dynamic balance correction on the light impeller to inhibit running vibration of the impeller; s200, arranging the bearing box shell on the mounting surface, and arranging two groups of rolling bearings in the bearing box shell; s300, arranging a lubrication sealing assembly on the bearing box shell, connecting the impeller subjected to dynamic balance correction in the step S100 to the output end of the bearing box shell, and connecting the input end of the bearing box shell with a driving motor through an elastic coupling; And S400, arranging a cooling system on the bearing box shell, and when the temperature of the bearing box shell or the rolling bearing in the bearing box shell exceeds a second set value, starting the cooling system to cool the bearing box shell or the rolling bearing.
2. The method for cooperatively controlling vibration temperature of a bearing housing of a shaft-plus-fan according to claim 1, wherein in step S100, a shaft-plus-fan impeller rotor having a balance accuracy level of a first set value is selected, and a maximum residual unbalance of the impeller is calculated by a formula m= (g×10000×m)/(n×r), wherein G is the balance accuracy level of the shaft-plus-fan impeller rotor, M is the impeller mass, n is the impeller rotational speed, and r is the impeller radius, and dynamic balance correction is performed on the impeller by using a dynamic balancing machine to ensure that the residual unbalance is not greater than the maximum residual unbalance.
3. The method for collaborative control of vibration temperature of a bearing housing of a shaft blower according to claim 1, wherein in step S400, a cooling pipeline in a cooling system is a metal heat pipe, the metal heat pipe is closely attached to or embedded in a heating area of a housing of the bearing housing, an electric control valve and a temperature detecting element are arranged on a circulating cooling circuit in the cooling system, the temperature detecting element is attached to the housing of the bearing housing, and the electric control valve and the temperature detecting element are electrically connected with a central control system.
4. The vibration temperature cooperative control method of the bearing box of the shaft blower according to claim 3, wherein the temperature detection element collects temperature data of the bearing box shell and the rolling bearing in real time and transmits the temperature data to the central control system, the central control system compares the temperature data with a second set value, when the temperature data is larger than the second set value, the electric control valve is controlled to be opened, cooling water circulates in the circulating cooling loop, cooling of the bearing box shell and/or the rolling bearing is achieved through heat conduction, and when the temperature data is not larger than the second set value, the central control system controls the electric control valve to be closed, and cooling is stopped.
5. The method for controlling vibration temperature of a bearing housing of a shaft plus fan according to claim 4, wherein the cooling water is warm water, the temperature of the cooling water is not more than 30 ℃, and the flow rate of the cooling water in the cooling pipeline is 0.8m/s-1.2m/s.
6. The method according to claim 1, wherein in step S300, the rolling bearing is assembled into the bearing housing and the coaxiality error of the rolling bearing assembly is controlled, then the lubrication medium in the lubrication seal assembly is filled into the bearing housing to form a composite lubrication of oil bath lubrication and splash lubrication, the bearing housing is sealed by adopting a double-layer seal structure in the lubrication seal assembly, and the air pressure balancing operation is synchronously performed to balance the air pressure inside and outside the bearing housing.
7. The method for cooperatively controlling the vibration temperature of the bearing box of the shaft and fan according to claim 1 is characterized by further comprising the step S500 of carrying out no-load debugging and load debugging on the shaft and fan, wherein the shaft and fan is started to carry out no-load debugging, the vibration amplitude, the lubrication sealing state and the cooling system state of the bearing box shell are monitored, the shaft and fan is started to carry out load debugging, the temperature of the rolling bearing and the vibration amplitude of the bearing box shell are continuously monitored until the temperature of the rolling bearing is not more than 40 ℃, the horizontal vibration amplitude of the bearing box shell is not more than 0.01mm, and the vertical vibration amplitude of the bearing box shell is not more than 0.02mm, so that no-load and load debugging is completed.
8. The method according to claim 7, wherein the vibration amplitude of the bearing housing is monitored by arranging eddy current vibration sensors in the horizontal direction and the vertical direction of the bearing housing, respectively, and collecting the vibration amplitude data of the bearing housing at a fixed monitoring frequency.
9. The method for collaborative control of vibration temperature of a shaft plus fan bearing housing according to claim 1 wherein the coaxiality error of the rolling bearing and the bearing housing is not greater than 0.02mm.
10. A shaft plus fan bearing housing for implementing a shaft plus fan bearing housing vibration temperature cooperative control method as claimed in any one of claims 1 to 9, comprising: a bearing box shell, the inside of which is provided with a transmission mechanism; a rolling bearing provided inside the bearing housing case; And the cooling system is arranged on the bearing box shell and is electrically connected with the central control system.

Description

Shaft-added fan bearing box vibration temperature cooperative control method and bearing box thereof Technical Field The invention relates to the technical field of control of auxiliary equipment of steam turbines, in particular to a method for cooperatively controlling vibration temperature of a bearing box of a shaft plus fan and a bearing box thereof. Background The main functions of the shaft seal heater fan (shaft plus fan for short) are to maintain the micro negative pressure of the shaft seal steam extraction condenser, ensure the shaft seal steam not to leak and the external air not to invade, and further ensure the vacuum tightness of the steam turbine and the stable operation of the unit. The operation stability of the shaft blower directly determines the working reliability of the whole turbine shaft seal system, and once the shaft blower fails and stops, serious problems such as shaft seal steam leakage, turbine lubricating oil emulsification, condenser vacuum damage and the like are easily caused, so that the normal operation of a unit is influenced. In the prior art, two technical problems commonly exist in the operation process of the shaft blower, the operation stability of the shaft blower is severely restricted, and the problem that the shaft blower cannot be cooperatively solved through single improvement is solved, namely, firstly, the impeller is large in mass, large unbalanced inertia force is easily generated during high-speed rotation, the impeller operates and vibrates severely, the vibration amplitude exceeds the standard, further linkage faults such as bearing abrasion and bearing box cracking are caused, meanwhile, the dynamic balance correction precision of the conventional impeller is insufficient, the residual unbalance amount cannot be accurately controlled by combining with the actual operation parameters of the impeller, and the vibration problem is further aggravated. Secondly, the assembly precision of the rolling bearing in the bearing box is insufficient, the coaxiality error is larger, the lubrication sealing structure is imperfect, the problems of lubrication failure, sealing leakage and the like are easy to occur, the cooling system is mainly passively cooled, automatic start and stop cannot be realized according to the temperature change of the bearing and the bearing box, when the bearing runs at a high speed to generate a large amount of heat, the cooling is not timely, the temperature of the bearing exceeds the standard, the bearing is burnt, and the continuous and stable running of the shaft blower is seriously influenced. Disclosure of Invention The invention provides a method for cooperatively controlling vibration temperature of a bearing box of a shaft blower and the bearing box thereof, which are used for solving at least one technical problem. The method for cooperatively controlling the vibration temperature of the bearing box of the shaft plus fan comprises the following steps: s100, adopting a light shaft and a fan impeller, and carrying out dynamic balance correction on the light impeller to inhibit running vibration of the impeller; s200, arranging the bearing box shell on the mounting surface, and arranging two groups of rolling bearings in the bearing box shell; s300, arranging a lubrication sealing assembly on the bearing box shell, connecting the impeller subjected to dynamic balance correction in the step S100 to the output end of the bearing box shell, and connecting the input end of the bearing box shell with a driving motor through an elastic coupling; And S400, arranging a cooling system on the bearing box shell, and when the temperature of the bearing box shell or the rolling bearing in the bearing box shell exceeds a second set value, starting the cooling system to cool the bearing box shell or the rolling bearing. In one embodiment, in step S100, a shaft plus fan impeller rotor with a balance accuracy level of a first set value is selected, and the maximum residual unbalance of the impeller is calculated by the formula m= (g×10000×m)/(n×r), where G is the balance accuracy level of the shaft plus fan impeller rotor, M is the impeller mass, n is the impeller rotational speed, and r is the impeller radius, and dynamic balance correction is performed on the impeller by using a dynamic balancing machine to ensure that the residual unbalance is not greater than the maximum residual unbalance. In one embodiment, in step S400, the cooling pipeline in the cooling system is a metal heat-conducting pipe, the metal heat-conducting pipe is closely attached to or embedded in the heating area of the bearing box housing, the circulating cooling circuit in the cooling system is provided with an electric control valve and a temperature detection element, the temperature detection element is attached to the bearing box housing, and the electric control valve and the temperature detection element are electrically connected with the central control system. In