CN-115864709-B - Rear end dustproof sealing motor for radiating of radio transmitter

CN115864709BCN 115864709 BCN115864709 BCN 115864709BCN-115864709-B

Abstract

The invention discloses a rear-end dustproof sealing motor for radiating a radio transmitter, which comprises a machine shell, a main shaft, a rotor and a stator, wherein a front end cover and a rear end cover are respectively arranged at the front and the rear of the machine shell, the front end of the main shaft extends out of the front end cover forwards, the rear end of the main shaft is rotationally connected with the rear end cover through a rear bearing, and a dustproof sealing device for sealing a bearing chamber is arranged at the front side of the rear end cover. The dustproof sealing device adopts a structure of combining the double-lip framework oil seal and the special-shaped oil seal seat, is used for preventing dust of a bearing of a radiating fan in a radiating system of a transmitter, avoids the pollution of lubricating grease, ensures that a motor has double dust prevention, prolongs the service life of the motor, improves the utilization rate of the fan and ensures the reliable operation of the radiating system of the transmitter.

Inventors

HUANG JUNYING
LI WENJUN
LIU XIANGYANG
Cai Xincen

Assignees

河南广播电视台104台

Dates

Publication Date: 20260505
Application Date: 20221118

Claims (3)

1. The rear end dustproof sealing motor for radiating the radio transmitter comprises a shell, a main shaft, a rotor and a stator, wherein the shell is cylindrical, the front end and the rear end of the shell are respectively provided with a front end cover and a rear end cover, the front end cover and the rear end cover are of a ventilating grill structure, the front end of the main shaft is rotationally connected with the front end cover through a front bearing, the front end of the main shaft extends out of the front end cover forwards, the rear end of the main shaft is rotationally connected with the rear end cover through a rear bearing, the rotor is arranged on the main shaft, the stator is arranged on the inner wall of the shell and positioned outside the rotor, and fan blades positioned between the front end cover and the rotor are arranged on the main shaft; the dustproof sealing device comprises a special-shaped oil seal seat, a double-lip framework oil seal and a sealing gasket, wherein the special-shaped oil seal seat is buckled at an opening at the front side of a bearing chamber, the special-shaped oil seal seat is fixedly connected with a rear end cover through two bolt assemblies positioned outside the bearing chamber, the sealing gasket is pressed between the rear side surface of the special-shaped oil seal seat and the front end ring surface of the bearing chamber, a front-back transparent step hole is formed in the center of the special-shaped oil seal seat, a main shaft coaxially penetrates through the step hole, and the double-lip framework oil seal is assembled in the step hole in an interference manner and is in rotary sealing fit with the outer circle of the main shaft; The special-shaped oil seal seat comprises a seat body which is in a circular ring shape, an inner circular ring is arranged on the rear side of the seat body, a central hole of the seat body is formed into the step hole, a first arc-shaped plate and a second arc-shaped plate are arranged on the outer circle of the seat body, a first mounting hole for penetrating a bolt component is formed in the first arc-shaped plate, a second mounting hole for penetrating a bolt component is formed in the second arc-shaped plate, the first mounting hole and the second mounting hole are symmetrical about the central line of the central step hole of the seat body, and a positioning ring matched with the outer circle of the front end of a bearing chamber is integrally arranged on the rear side of the special-shaped oil seal seat.
2. The rear end dust seal motor for a radio transmitter heat sink of claim 1 wherein the profiled oil seal mount is made of h62 brass and the sealing gasket is made of asbestos board.
3. The rear end dust-proof sealing motor for heat dissipation of a radio transmitter according to claim 1 or 2, wherein the rotor is internally provided with a plurality of left and right through heat dissipation air holes, and all the heat dissipation air holes are uniformly distributed along the circumferential direction of the main shaft.

Description

Rear end dustproof sealing motor for radiating of radio transmitter Technical Field The invention belongs to the technical field of radio transmitters, and particularly relates to a rear-end dustproof sealing motor for radiating of a radio transmitter. Background With the development of the LED and electronic devices toward high power, integration and volume miniaturization, the related power devices generate more and more heat, so the primary problem to be solved by people is heat dissipation. If the heat generated by the materials cannot be timely emitted, the junction temperature of the device can be increased, and the working stability, the service life and the like of the device are seriously affected. The polymer-based heat conduction insulating material can be applied between a heating device and a heat dissipation device, and is one of key components for heat management. The transmitter acts as the "heart" of the radio transmission system, and the electrical components inside it generate a lot of heat during operation. The temperature has a relatively large influence on the performance of the electric element, and researches show that the reliability is reduced by 60 percent when the temperature of the power transistor is increased by 10 degrees. For high power radio transmitters, the temperature affects their performance even more. The purpose of the broadcast transmitter cooling system is to achieve thermal reliability and ensure that the system can operate reliably and efficiently according to predetermined parameters. The DX series medium wave transmitter is a main application model of a high-power medium wave transmitter in China, can be divided into a water cooling model and an air cooling model according to a cooling mode, and has the advantages of simple system structure, stability, reliability, economy in operation, simplicity and convenience in maintenance and the like although the air cooling is lower than the water cooling. The air-cooled DX series transmitter enlarges the conduction heat dissipation area through the field effect power tube and the radiator so as to force air convection to take away the heat emitted by the main body of the system, and the heat-conduction and convection heat transfer process is realized simultaneously. In the air-cooled heat dissipation system, the air source for dissipating heat to the transmitter is a heat dissipation fan (a fan is arranged on the shaft extension end of the motor main shaft). The cooling fan is arranged in the transmitter, the front end cover and the rear end cover of the cooling fan are designed to be ventilation end covers with ventilation grids, when the cooling fan is in operation, a cooling air source is sucked into the transmitter through the filtering device to cool components in the transmitter, meanwhile, the motor is also used for generating heat during operation, fan blades which are arranged in the motor and are positioned on the front side of the main shaft can suck the cold air sucked into the transmitter into the motor in a reverse direction, cool the motor and then are discharged through the ventilation grids on the rear end cover, bearings exposed in the bearing chamber of the rear end cover are blown by circulating air, although the dust covers on two sides of the bearings are provided with gaps, as the working time is prolonged, the gaps are gradually increased, the cooling mode of external strong air pressure blowing, dust, oil smoke, water mist, steam and the like can be brought into the transmitter by air flow, and finally the probability of pollution of dust grease contained in the bearings by the circulating air is greatly increased. The bearing generally adopts a deep groove ball bearing, has no cleaning function, is particularly sensitive to the cleanliness of circulating air, and once dust invades lubricating grease, dust stays in the lubricating grease, so that the service life of the bearing is greatly reduced once the lubricating grease is polluted, the play of the bearing is increased, vibration is generated, a motor spindle generates radial runout and axial runout when rotating, and the normal working state of a fan is damaged, so that the wind speed and the wind quantity of cooling air are reduced, the normal heat dissipation of a transmitter is influenced, the stable temperature rise of the transmitter is changed, and the high-temperature fault occurs. At present, in the domestic and foreign air-cooled transmitter cooling system, the technology adopted in solving the dustproof problem of the cooling fan driving motor mainly comprises the following steps: 1. The domestic transmitter factory adopts the outer rotor asynchronous motor more, and this type of motor overall structure is sealed relatively, seals the bearing that sets up between main shaft and the end cover and adopts rubber seal, because this technique does not have forced lubrication device, and the dust in the heat dissipation circulating win