CN219366747U

CN219366747U - Magnetic suspension type speed reducer system

Info

Publication number: CN219366747U
Application number: CN202223599747.2U
Authority: CN
Inventors: 黄立新
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-12-31
Filing date: 2022-12-31
Publication date: 2023-07-18
Anticipated expiration: 2032-12-31

Abstract

The utility model relates to a magnetic suspension formula speed reducer system, including motor and speed reducer, be provided with the output shaft on the speed reducer, still be provided with the magnet support on the speed reducer, magnet support one end is connected the speed reducer, and the other end is provided with the magnetic screen cover, sets up down magnet cover and last magnet cover respectively in the magnetic screen cover, installs down magnet in lower magnet cover, installs magnet in last magnet cover, and lower magnet and last magnet repel each other, go up magnet and the one end connection of output shaft, the other end connection load of output shaft. The utility model utilizes the repulsive force of the two magnets to balance the weight of the output shaft of the speed reducer and the parts arranged on the output shaft, can basically eliminate the axial force (mainly gravity) borne by the bearing of the output shaft, lighten the mechanical friction loss of the bearing, greatly reduce the power consumption of the speed reducer, prolong the service life of the speed reducer by several times, and can be applied to any other vertical output shaft speed reducer besides the air cooling island system of the thermal power plant.

Description

Magnetic suspension type speed reducer system

Technical Field

The application relates to the field of speed reducer systems, in particular to a magnetic suspension speed reducer system.

Background

The energy source of our country is characterized by more coal, less oil and less gas. Coal mines are mostly distributed in the north, however, the water resources in the north are insufficient.

Along with the continuous increase of ultra-supercritical large-capacity units, the water consumption of the thermal generator set is larger and larger. Therefore, water resources become an important factor to be considered in the site selection of a thermal power plant. In order to reduce the occupation of excessive local water resources by a thermal generator set, an air cooling system is generally adopted to cool the exhaust steam of a steam turbine.

At present, three modes of an air cooling system mainly exist, namely a direct cooling system, a surface condenser indirect air cooling system and a hybrid condenser indirect air cooling system.

The direct air cooling system is also called as ACC (Air Cooled Condencer) system, which means that the exhaust steam of the steam turbine is introduced into the outdoor air cooling condenser to be directly condensed by air. The technological process is that the exhaust steam of the steam turbine is led into an outdoor air-cooling condenser through a large-diameter exhaust pipeline, an axial flow cooling fan arranged below the air-cooling condenser drives the air to flow through the outer surface of the condenser, the exhaust steam is condensed into condensed water, and the condensed water is pumped back to a regenerative system of the steam turbine.

Based on the anti-freezing requirement, the direct air cooling system is generally provided with a forward condenser and a reverse condenser. Most of the steam in the direct air cooling system is condensed in the forward condenser, and the rest of the steam is condensed through the reverse condenser. In the countercurrent condenser, the movement directions of the steam and the condensed water are opposite, so that the condensed water is not easy to freeze. The top of the countercurrent condenser is provided with a vacuumizing system which can suck out air and non-condensable gas in the system. Compared with other air cooling systems, the direct air cooling system has the main characteristics that:

(1) The cooling efficiency is high. The intermediate cooling medium required by secondary heat exchange is eliminated, and the air is used for cooling the steam turbine to exhaust steam, so that the heat exchange temperature difference is large, and the cooling efficiency is high.

(2) Floor occupation the product is small. The air-cooled condenser is arranged at a high position on an outer platform of the steam turbine room A, and equipment such as a transformer and a building can be arranged below the platform.

(3) The investment is saved.

(4) The system is flexible to adjust and good in anti-freezing performance in winter. The air inlet quantity can be regulated by regulating the rotating speed of the fans or the quantity of the fans so as to adapt to the change of the heat load and the air temperature and prevent the inside of the air cooler from freezing.

(5) The power consumption of the plant is high. And a large fan group is adopted for ventilation, so that the power consumption of factories is high.

(6) The overhaul and maintenance workload is large.

(7) The noise is big during operation.

(8) The vacuum system is large in volume.

The 600MW unit air cooling island direct cooling system arranges 56 air cooling fans on a 40-50 m high frame platform, and the fans are inconvenient to maintain and overhaul due to high positions and compact arrangement. The diameter of each fan blade is approximately 10 meters, and the weight of 6 blades is 1000-1500kg; when the fan works, the axial force born by the output shaft of the speed reducer is greatly increased, particularly in summer, the air temperature is high, the back pressure of the steam turbine is high, the running load of the unit is limited, the rotating speed of the fan is often increased by operators, the convection heat exchange effect is increased, and the back pressure is reduced. The result of this operation is: on one hand, the back pressure is reduced, so that the load of the unit is increased; on the other hand, as the rotating speed of the air cooling fan exceeds the rated rotating speed, the power consumption of the fan is increased, so that the failure rate of the speed reducer is increased and even damaged. Aiming at the characteristics of large overhauling and maintenance workload and high power consumption of a fan reducer of an air cooling island direct cooling system, the magnetic suspension type speed reducer system structure is provided, the service life of the speed reducer can be greatly prolonged, and the running power consumption of an air cooling fan is reduced.

Disclosure of Invention

The embodiment of the application aims to provide a magnetic suspension type speed reducer system, which realizes magnetic suspension through upper and lower strong magnets, so that the axial force borne by an output shaft bearing is basically eliminated, the mechanical friction loss of the bearing is reduced, the power consumption of the speed reducer is greatly reduced, and the service life of the speed reducer is prolonged.

In order to achieve the above purpose, the present application provides the following technical solutions:

the embodiment of the application provides a magnetic suspension type speed reducer system, including motor and speed reducer, the speed reducer is used for providing power in motor connection, be provided with the output shaft on the speed reducer, still be provided with the magnet support on the speed reducer, the speed reducer is connected to magnet support one end, and the other end is provided with the magnetic screen cover, sets up down magnet cover and last magnet cover respectively in the magnetic screen cover, installs down magnet in lower magnet cover, installs magnet in last magnet cover, and lower magnet and last magnet repel each other, go up the magnet and be connected with the one end of output shaft, the other end connection load of output shaft.

And one end of the output shaft, which is close to the load, is provided with an extension section, and the end part of the extension section is connected with the load.

The lower magnet sleeve completely seals the lower magnet, and the upper magnet sleeve completely seals the upper magnet.

The magnet support is in complete sealing connection with the magnetic shielding cover.

The magnet support is in complete sealing connection with the speed reducer.

The lower magnet and the upper magnet are annular strong magnets.

The output shaft penetrates through the magnet support and is fixedly connected with the upper magnet sleeve.

The load connected with the end part of the output shaft is a blade for the air cooling island.

Compared with the prior art, the utility model has the beneficial effects that: the repulsive force of the two magnets is utilized to balance the weight of the output shaft of the speed reducer and the weight of the part mounted on the output shaft, the axial force (gravity) borne by the bearing of the output shaft can be basically eliminated, the mechanical friction loss of the bearing is reduced, the power consumption of the speed reducer is greatly reduced, the service life of the speed reducer is prolonged by several times, and therefore, the maintenance workload of an air cooling island system is greatly reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic overall structure of an embodiment of the present utility model.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The terms "first," "second," and the like, are used merely to distinguish one entity or action from another entity or action, and are not to be construed as indicating or implying any actual such relationship or order between such entities or actions.

As shown in fig. 1, a magnetic suspension type speed reducer system comprises a motor 1 and a speed reducer 2, wherein the motor 1 is connected with the speed reducer 2 for providing power, an output shaft 4 is arranged on the speed reducer 2, a magnet support 3 is further arranged on the speed reducer 2, one end of the magnet support 3 is connected with the speed reducer 2, the other end of the magnet support is provided with a magnetic shielding cover 5, a lower magnet sleeve 6 and an upper magnet sleeve 7 are respectively arranged in the magnetic shielding cover 5, a lower magnet 8 is arranged in the lower magnet sleeve 6, an upper magnet 9 is arranged in the upper magnet sleeve 7, the lower magnet 8 and the upper magnet 9 repel each other, the upper magnet 9 is connected with one end of the output shaft 4, and the other end of the output shaft 4 is connected with a load. An extension section is arranged at one end, close to the load, of the output shaft 4, and the end of the extension section is connected with the load. The lower magnet sleeve 6 completely seals the lower magnet 8, and the upper magnet sleeve 7 completely seals the upper magnet 9. The lower magnet 8 and the upper magnet 9 are ring-shaped strong magnets. The output shaft 4 passes through the magnet bracket 3 and is fixedly connected with the upper magnet sleeve 7. The load connected to the end of the output shaft 4 is a blade 10 for an air cooling island.

In this application, be current conventional means with being connected between motor 1 and the speed reducer 2, this application creatively lengthens output shaft 4 and perpendicular to ground design, and set up upper and lower annular strong magnet at the perpendicular output shaft of air cooling island fan speed reducer, utilize strong magnet to repel each other, balance the gravity of speed reducer vertical axis and fan blade, can reduce fan current by a wide margin, reduce output shaft bearing's wearing and tearing and friction generate heat, reduce the plant power consumption of air cooling island by a wide margin, simultaneously, make speed reducer life extension several times, make air cooling island fan life extension to 30-50 years.

The magnetic suspension type speed reducer system can be used for all speed reducer equipment using vertical output shafts, such as air cooling islands of thermal power plants. The magnetic suspension type vertical output shaft device can be applied to any other vertical output shaft speed reducer besides the air cooling island system of the thermal power plant.

The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. The utility model provides a magnetic suspension formula speed reducer system, includes motor (1) and speed reducer (2), motor (1) are connected speed reducer (2) and are used for providing power, a serial communication port, be provided with output shaft (4) on speed reducer (2), still be provided with magnet support (3) on speed reducer (2), speed reducer (2) are connected to magnet support (3) one end, the other end is provided with magnetic screen cover (5), set up down magnet cover (6) and last magnet cover (7) in magnetic screen cover (5) respectively, install down magnet (8) in magnet cover (6) down, install magnet (9) in last magnet cover (7), down magnet (8) and last magnet (9) repel each other, go up magnet (9) and output shaft (4) one end connection, the other end connection load of output shaft (4).

2. A magnetically levitated speed reducer system according to claim 1, characterized in that the output shaft (4) is provided with an extension at its end close to the load, the end of the extension being connected to the load.

3. A magnetically levitated speed reducer system according to claim 1, characterized in that the lower magnet sleeve (6) completely encloses the lower magnet (8) and the upper magnet sleeve (7) completely encloses the upper magnet (9).

4. A magnetically levitated speed reducer system according to claim 1, characterized in that the lower magnet (8) and the upper magnet (9) are ring-shaped strong magnets.

5. A magnetically levitated speed reducer system according to claim 1, characterized in that the output shaft (4) is fixedly connected to the upper magnet sleeve (7) through the magnet holder (3).

6. A magnetically levitated speed reducer system according to claim 1, characterized in that the magnet support (3) is in a completely sealed connection with the magnetic shielding (5), and the magnet support (3) is in a completely sealed connection with the speed reducer (2).

7. A magnetically levitated speed reducer system according to claim 1, characterized in that the end-connected load of the output shaft (4) is a blade (10) for an air cooling island.