CN-122014758-A - Automatic cooling device for high-voltage motor bearing

CN122014758ACN 122014758 ACN122014758 ACN 122014758ACN-122014758-A

Abstract

The invention discloses an automatic cooling device for a high-voltage motor bearing, which relates to the technical field of high-voltage motor equipment, and comprises a temperature acquisition unit, a control unit, a cooling execution unit and a power supply protection unit, wherein the temperature acquisition unit multiplexes a standby wire core of a primary temperature measuring element of the high-voltage motor bearing, and acquires a bearing temperature signal in real time; the control unit automatically controls the start and stop of the cooling fan according to a preset temperature threshold value through the secondary temperature control instrument, and the cooling execution unit adopts the cooling fan which is fixedly installed to accurately target the bearing seat to cool down. The invention does not need manual intervention, realizes full-automatic closed-loop cooling control of the bearing temperature, does not damage the original structure of the motor, has low transformation cost, strong universality and stable and reliable cooling effect, can effectively protect a bearing lubricating oil film, avoid motor tripping accidents caused by the overtemperature of the bearing, greatly improves the running safety and stability of the high-voltage motor, and is suitable for high-voltage motor equipment in various industrial scenes.

Inventors

YANG SHAOXIAN
ZHONG ZHITONG
HUANG YUTANG
GAO CHANGLONG
Qin Ningzhi

Assignees

广东顺控环境投资有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (8)

1. The automatic cooling device for the high-voltage motor bearing is characterized by comprising a temperature acquisition unit, a control unit, a cooling execution unit and a power supply protection unit; The temperature acquisition unit comprises a temperature measurement element of the high-voltage motor bearing, the temperature measurement element is provided with a standby wire core, and the standby wire core is connected with a signal input end of the control unit and is used for acquiring temperature signals of the high-voltage motor bearing in real time and transmitting the temperature signals to the control unit; The control unit comprises a secondary temperature control instrument and a fan start-stop control box, wherein the signal input end of the secondary temperature control instrument is connected with the standby wire core, a temperature setting module and a relay output contact are arranged in the secondary temperature control instrument, and the relay output contact is connected with a control loop in the fan start-stop control box and is used for controlling the start-stop of the cooling execution unit according to the acquired bearing temperature signal; The cooling execution unit comprises at least one cooling fan, the cooling fan is fixedly arranged on the outer side of a bearing seat of a high-voltage motor bearing, and a power supply end of the cooling fan is connected with a power output end of the power supply protection unit and is used for carrying out forced air cooling on the bearing seat; The power supply protection unit comprises a power loop protection element and a control loop protection element, and provides working power supply and electrical protection for the cooling execution unit and the control unit respectively.
2. The automatic cooling device for the high-voltage motor bearing according to claim 1, wherein the standby wire core of the temperature measuring element is connected to the signal input end of the secondary temperature control instrument in a three-wire connection mode.
3. The automatic cooling device for a high-voltage motor bearing according to claim 1, wherein an upper temperature limit start value and a lower temperature limit stop value of the secondary temperature control meter are independently settable, the upper temperature limit start value is 65 ℃, and the lower temperature limit stop value is 55 ℃.
4. The automatic cooling device for the high-voltage motor bearing according to claim 1, wherein an intermediate relay and an alternating current contactor are arranged in the fan start-stop control box, a relay output contact of the secondary temperature control instrument is connected with a coil control loop of the intermediate relay, a normally open auxiliary contact of the intermediate relay is connected with a coil control loop of the alternating current contactor, and a main contact of the alternating current contactor is connected in series in a power supply loop of the cooling fan.
5. The automatic cooling device for high-voltage motor bearings according to claim 1, wherein the cooling fan is installed below or at a side of the bearing housing through a fixing bracket, and an air outlet of the cooling fan is opposite to a heat dissipation surface of the bearing housing.
6. The automatic cooling device for high-voltage motor bearings according to claim 1, wherein the cooling fans are provided in two stages, which are respectively provided corresponding to the front bearing housing and the rear bearing housing of the high-voltage motor.
7. The automatic cooling device for the high-voltage motor bearing according to claim 1, wherein the power loop protection element is connected in series with a power supply loop input end of the cooling fan, and the control loop protection element is connected in series with a power supply loop input end of the control unit.
8. The automatic cooling device for the high-voltage motor bearing according to claim 1, wherein the secondary temperature control instrument is further provided with an overtemperature alarm contact, and the overtemperature alarm contact is connected with an audible and visual alarm and is used for giving an alarm prompt when the temperature of the bearing exceeds a preset alarm threshold.

Description

Automatic cooling device for high-voltage motor bearing Technical Field The invention relates to the technical field of high-voltage motor equipment, in particular to an automatic cooling device for a high-voltage motor bearing. Background The high-voltage motor is a core power device in the industrial fields of electric power, metallurgy, chemical industry, mine and the like, and the running safety and stability of the high-voltage motor directly determine the continuous running capacity of the whole production system. The bearing is used as a core rotary supporting component of the high-voltage motor, the running temperature of the bearing is a core index for representing the health state of the bearing, the abnormal rise of the temperature of the bearing can directly damage a lubricating oil film in the bearing, so that the bearing is worn seriously, abnormal sound and vibration occur, the bearing is locked when the bearing is seriously, the high-voltage motor is super Wen Tiaozha, and further, the whole production unit is stopped in an unplanned mode, and huge economic loss is brought to enterprises. At present, aiming at the problem that the temperature rise of a high-voltage motor bearing exceeds standard, the conventional coping modes in the industry are mainly divided into two types, namely a primary radiating structure which depends on the high-voltage motor and is provided with a front oil baffle and a rear oil baffle for sealing, the ventilation path of a bearing area is limited, the natural cooling effect is extremely poor, the abnormal temperature rise working condition of the bearing cannot be coped with, and the other type is that an operator temporarily erects an external axial flow fan on site after finding that the temperature of the bearing exceeds standard, and forced air cooling and cooling are carried out on the bearing. The prior art scheme of temporary air cooling has a plurality of technical defects which are difficult to solve in practical application: The response is seriously delayed, and the optimal cooling time is missed. The existing scheme relies on the manual work to discover that the temperature is unusual and then can start the treatment, reports to the police from the DCS system, staff reaches the scene, erects the fan and starts the cooling to accomplishing the wiring, needs longer treatment time, and bearing temperature can continuously rise during that, extremely easily triggers motor overtemperature tripping protection, can't realize the unusual quick response of temperature rise. The manual operation is complicated, and serious potential safety hazards exist. The temporary erection of fans requires field personnel to carry equipment, field fixing and temporary wiring, and most of areas where high-voltage motors are located are high-voltage live working areas, so that the temporary wiring operation has great safety risks of electric shock and equipment short circuit, and the safety production specifications of industrial fields are not met. Automatic closed-loop control cannot be realized, energy consumption is high, and temperature control effect is poor. The temporary fan cannot be started or stopped automatically according to the temperature of the bearing after being started, or unnecessary electric energy waste is caused by continuous operation, or the temperature of the bearing is repeatedly fluctuated due to untimely manual shutdown, so that the temperature of the bearing cannot be controlled in a safe operation interval stably. The cooling effect is unstable and the targeting property is poor. The fan mounted position of temporarily setting up is not fixed, can't the accurate core heat dissipation area of aiming at the bearing frame, and the route and the amount of wind of cooling wind are unstable, and cooling efficiency is low, is difficult to restrain bearing temperature rise fast, can't effectively protect bearing lubricating oil film. The unattended scene cannot be adapted. For the scenes of remote pump stations, unattended transformer stations and the like, timely treatment of abnormal bearing temperature rise cannot be achieved, and equipment protection requirements under unattended working conditions cannot be met completely. Disclosure of Invention In view of the defects of the prior art, the invention aims to provide the automatic cooling device for the high-voltage motor bearing, realize real-time online monitoring and automatic closed-loop cooling control of the temperature of the high-voltage motor bearing, quickly respond to abnormal temperature rise of the bearing without manual intervention, avoid damaging the original body structure of the motor, ensure stable and reliable cooling effect, simultaneously avoid the safety risk of on-site temporary operation, effectively avoid motor tripping accidents caused by over-temperature of the bearing and greatly improve the safety and stability of the operation of the high-voltage motor. An automatic coo