CN220711222U

CN220711222U - Novel end cover type bearing generator

Info

Publication number: CN220711222U
Application number: CN202322141068.9U
Authority: CN
Inventors: 薛雁月; 鲜青龙; 黎瑞涛; 吴俊濠
Original assignee: GUANGZHOU GUANGZHONG ENTERPRISE GROUP CORP
Current assignee: GUANGZHOU GUANGZHONG ENTERPRISE GROUP CORP
Priority date: 2023-08-10
Filing date: 2023-08-10
Publication date: 2024-04-02
Anticipated expiration: 2033-08-10

Abstract

The utility model discloses a novel end cover type bearing generator, which comprises a rotor and a fan, wherein the rotor and the fan are arranged in a stator frame, the rotor is connected with a rotating shaft, the fan is arranged on the rotating shaft and then extends out of the stator frame through a sliding bearing, a sealing cover is arranged on the inner side and the outer side of the sliding bearing, the sealing cover is in cover sealing with a bearing seat of the sliding bearing, an annular groove is arranged close to the sealing cover on the bearing seat side and is used as an air supplementing chamber, and the air supplementing chamber is communicated with the outside through an air supplementing pipe.

Description

Novel end cover type bearing generator

Technical Field

The utility model relates to the technical field of generators, in particular to a novel end cover type bearing generator.

Background

The end cover type bearing generator is characterized in that two bearings of a steam end and an excitation end are arranged on end covers on two sides of a stator frame and are called end cover type bearings. Each end cover consists of an upper end cover and a lower end cover, a bearing component is arranged on the end cover, the bearing component consists of a bearing bush, bearing oil seal and the like, and the circulated sealing oil can lubricate the bearing bush and reduce the temperature of the bearing bush. The sliding bearing comprises a bearing seat and a bearing bush arranged in the bearing seat, the sealing cover and the bearing seat are in cover sealing, the aperture of the bearing bush is slightly larger than that of the journal, when the sliding bearing is static, the journal is positioned at the lower part of the bearing bush and directly contacts with the inner surface of the bearing bush, and a wedge-shaped gap is formed between the bearing bush and the journal. When the rotor starts to rotate, direct friction occurs between the journal and the bearing shell. However, after lubricating oil with a certain pressure and viscosity is continuously supplied to the bearing along with the rotation of the journal, an oil layer adhered to the journal rotates along with the journal and drives adjacent layers to rotate, and enters a wedge-shaped gap with a large upper part and a small lower part formed between the journal and the bearing bush, and flows towards the rotation direction and the end part of the bearing. As the rotational speed increases, the amount of oil carried in increases, and the wedge-shaped area gradually decreases, and the lubricating oil carried in therein is accumulated in a small gap to generate oil pressure due to incompressibility. With the increase of the rotating speed, when the pressure is increased enough to balance the whole acting force of the rotor on the bearing bush, the journal is lifted by the oil film and is suspended on the oil film to rotate, so that the direct friction of metal is avoided, and the liquid friction is established. However, when the fan 2 inside the stator frame 1 dissipates heat, the area inside the stator frame near the sliding bearing 3 is easy to form a negative pressure area 4, so that the lubricating oil mist between the sealing cover 5 and the bearing seat 31 is easy to be sucked to the inner side of the generator due to the negative pressure, as shown in fig. 1, in order to solve the problem, in the prior art, an annular groove is arranged on the side of the sealing cover near the bearing seat as an air supplementing chamber 6, the air supplementing chamber is provided with an air supplementing hole and is communicated with the outside through an air supplementing pipe, and the oil mist of the bearing chamber is prevented from being sucked into a host machine due to the negative pressure (because the bearing chamber is positive pressure), so that oil leakage of the bearing is caused on one hand, the surface of a stator winding is polluted on the other hand, the heat dissipation and the insulation performance of the coil are affected, and in severe cases, accidents may occur, as shown in fig. 2. However, due to the location of the openings in the stator casing, such as: when the sealing effect of junction of the outlet box, the temperature measuring junction box, the top air cooler and the stator frame is bad, only the air supplementing pipe supplements air, and the clamp structure for the air supplementing pipe is used, so that the air supplementing pipe is easy to drop, normal air supplementing cannot be carried out, and under the action of positive pressure in the bearing chamber, oil leakage is easy to occur at a fit clearance between the bearing seat and the sealing cover, and the end cover type bearing generator is easy to damage.

Disclosure of Invention

The utility model aims to provide a novel end cover type bearing generator which can improve oil leakage at a fit clearance between a bearing seat and a sealing cover so as to prevent the end cover type bearing generator from being damaged.

The novel end cover type bearing generator comprises a rotating shaft and a fan, wherein the rotating shaft and the fan are arranged in a stator frame, the fan is arranged on the rotating shaft and then penetrates through a sliding bearing to extend out of the stator frame, a sealing cover is arranged on the inner side and the outer side of the sliding bearing, the sealing cover and a bearing seat of the sliding bearing are in cover sealing, an annular groove is formed in the sealing cover close to the bearing seat side and is used as an air supplementing chamber, the air supplementing chamber is provided with an air supplementing hole which is communicated with the outside through an air supplementing pipe, a bearing inner cover is further arranged on the bearing seat close to the fan side, a notch is formed in the bearing inner cover and is used as a sealing chamber, the sealing chamber is communicated with the air supplementing chamber through a gap, and a blowing device for blowing external air into the air supplementing chamber and the sealing chamber is arranged at an inlet of the air supplementing pipe.

According to the novel end cover type bearing generator, the notch is formed in the inner cover of the bearing to serve as the sealing chamber, and the sealing chamber is communicated with the air supplementing chamber through the gap, so that one sealing part is increased, the sealing performance between the bearing seat and the sealing cover is better, the oil leakage problem at the matching gap between the bearing seat and the sealing cover can be solved, and the effect of preventing the end cover type bearing generator from being damaged is achieved; in addition, the air blowing device for blowing the external air into the air supplementing chamber is arranged at the inlet of the air supplementing pipe, so that the air supplementing pressure is increased, and the air supplementing effect is better; in addition, through the bearing frame that is close to the fan side still be provided with the bearing inner cup, the sealed lid of bearing inner cup business turn over compresses tightly on the bearing frame, and it further promotes the leakproofness between bearing frame and the sealed lid.

As a preferable scheme of the utility model, the air filter device is arranged on the air blowing device, particles and impurities in the air can be filtered through the air filter device, and the air inlet cleanliness is ensured, so that the blocking of the air supplementing pipe can be prevented, and the air supplementing effect is better.

As a preferable mode of the utility model, the air filtering device is a filter screen.

As a preferable scheme of the utility model, gas pressure sensors are arranged at the inlet of the air supplementing pipe and in the area, close to the sliding bearing, inside the stator base, the gas pressure sensors are in signal connection with a controller arranged on the stator base, the controller receives signals of the gas pressure sensors and sends control signals to the blowing device to control the rotating speed of the blowing device, and the rotating speed of the blowing device is controlled by the controller according to the air pressure requirement to realize air supplementing, so that the air pressure of the air supplementing chamber is larger than the pressure of the bearing chamber, the negative pressure area is ensured not to suck oil mist from the bearing, the problem of oil leakage of the bearing is better solved, and the effects of reducing the subsequent maintenance cost of enterprises and improving the market competitiveness are achieved.

As a preferred embodiment of the present utility model, the blower device is a fan device.

As a preferable scheme of the utility model, the bearing seat is provided with the first exhaust valve, and the air with too high bearing can be exhausted through the first exhaust valve, so that the balance of air pressure is ensured, and the oil leakage of the bearing is prevented.

As a preferable scheme of the utility model, the air supplementing chamber is provided with two air supplementing holes, one air supplementing hole is communicated with the outside through one air supplementing pipe, the other air supplementing hole is provided with a second exhaust valve, and when the air pressure of the air supplementing chamber is overlarge, the air can be exhausted through the second exhaust valve, so that the balance of the air pressure is ensured.

As a preferable scheme of the utility model, the air supplementing pipe is clamped on the sealing cover through the clamping connector, so that the loosening of the air pipe can be prevented, and a better protection effect is achieved.

Drawings

FIG. 1 is a block diagram of a prior art end cap bearing generator;

FIG. 2 is an enlarged view of a portion of FIG. 1A;

FIG. 3 is a block diagram of an end cap bearing generator of the present utility model;

FIG. 4 is an enlarged view of a portion of FIG. 3B;

FIG. 5 is a schematic illustration of the installation of a make-up tube;

FIG. 6 is a schematic diagram of a blower installation;

FIG. 7 is an enlarged view of a portion of FIG. 6C;

fig. 8 is a schematic view of a gas supply tube joint.

Description of the embodiments

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the present utility model, it should be noted that, if directional indications (such as up, down, left, right, front, rear, top, bottom, inner, outer, vertical, transverse, longitudinal, counterclockwise, clockwise, circumferential, radial, axial … …) are involved in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

As shown in fig. 3 and 4, a novel end cover type bearing generator comprises a rotor and a fan 2 which are installed in a stator frame, wherein the rotor is connected with a rotating shaft, the rotating shaft is provided with a fan, the fan is installed and then penetrates through a sliding bearing 3 to extend out of the stator frame 1, a sealing cover 5 is installed on the inner side and the outer side of the sliding bearing, the sealing cover is in cover sealing with a bearing seat 31 of the sliding bearing, an annular groove is formed in the sealing cover close to the bearing seat side and is used as an air supplementing chamber 6, the air supplementing chamber is provided with an air supplementing hole and is communicated with the outside through an air supplementing pipe 7, a bearing inner cover 8 is also arranged in the bearing seat close to the fan side, a notch is formed in the bearing inner cover and is used as a sealing chamber 9, the sealing chamber is communicated with the air supplementing chamber through a gap, and a blowing device 10 for blowing outside air into the air supplementing chamber and the sealing chamber is installed at an inlet of the air supplementing pipe.

The sliding bearing comprises a bearing seat 31 and a bearing bush 32 arranged in the bearing seat, the sealing cover and the bearing seat are in cover fit and seal, and the fit between the rotating shaft and the bearing bush is clearance fit.

The notch is arranged on the bearing inner cover and is used as a sealing chamber, the sealing chamber is communicated with the air supplementing chamber through a gap, and a sealing device is additionally arranged, so that the oil leakage problem at the fit gap between the bearing seat and the sealing cover can be solved, and the effect of preventing the damage of the end cover type bearing generator is achieved; in addition, the air blowing device for blowing the external air into the air supplementing chamber and the air sealing chamber is arranged at the inlet of the air supplementing pipe, so that the circulation of the air in the narrow and sealed air supplementing chamber can be quickened, the air supplementing pressure (greater than one atmosphere) is increased, the air supplementing of the narrow and sealed air supplementing chamber is more thorough and uniform, and the air supplementing effect is better; in addition, through the bearing frame that is close to the fan side still be provided with the bearing inner cup, the bearing inner cup compresses tightly sealed lid on the bearing frame, and it further promotes the leakproofness between bearing frame and the sealed lid.

As shown in fig. 5 and 6, the air supply chamber is provided with two air supply holes, wherein the left air supply hole is communicated with the outside through one air supply pipe. The blowing device can be arranged to be a fan device, and the air filtering device 11 is arranged on the blowing device, so that particles and impurities in air can be filtered through the air filtering device, the air inlet cleanliness is ensured, the blocking of the air supplementing pipe can be prevented, and the air supplementing effect is better. The air filtering means may be provided as a sieve, as shown in fig. 7. The second exhaust valve 13 is arranged on the right air supplementing hole, and the pressure of the air which is supplemented is large, so that the air enters the stator base in two directions, one direction enters the inside of the stator base, and the other direction enters the inside of the bearing, so that the exhaust pressure set by the exhaust valve 13 is greater than the exhaust pressure set by the exhaust valve 12, and the purpose is to prevent positive pressure in the bearing chamber from being discharged through an exhaust plug and not influenced by negative pressure of a main machine. When the air pressure of the air supplementing chamber is overlarge, the air can be exhausted through the second exhaust valve, so that the air pressure balance is ensured. In addition, be provided with first discharge valve 12 on the bearing frame, can discharge the too high gas of bearing through first discharge valve to guarantee the balance of atmospheric pressure, prevent the bearing oil leakage.

As shown in fig. 8, the original air supplementing pipe is clamped on the sealing cover through the clamping connector, when the clamping hoop is not tight, the original air supplementing pipe is easy to fall off, the existing air supplementing hole is connected in a threaded sealing mode, the position close to the bearing inner cover is prevented from being loose by the structure shown in fig. 8, and further better protection effect is achieved.

The air supplementing pipe is characterized in that air pressure sensors are arranged at the inlet of the air supplementing pipe and in the area, close to the sliding bearing, of the stator base, the air pressure sensors are connected with a controller on the stator base in a signal mode, the controller receives signals of the air pressure sensors and sends control signals to the air blowing device to control the rotating speed of the air blowing device, the rotating speed of the air blowing device is controlled according to the air pressure requirement by the controller, air supplementing is achieved through the fact that the air pressure of the air supplementing chamber is larger than the pressure of the bearing chamber, the fact that oil mist cannot be inhaled from the bearing chamber in a negative pressure area is guaranteed, accordingly the oil leakage problem of the bearing is solved better, and the effects of reducing subsequent maintenance cost of enterprises and improving market competitiveness are achieved.

The above embodiments are only for illustrating the detailed aspects of the present utility model, and the present utility model is not limited to the detailed aspects, i.e., it does not mean that the present utility model must be implemented depending on the detailed aspects. It should be apparent to those skilled in the art that any modification of the present utility model, equivalent substitution of raw materials for the product of the present utility model, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present utility model and the scope of disclosure.

Claims

1. The utility model provides a novel end cover formula bearing generator, including installing pivot and fan (2) in the stator frame, pass slide bearing (3) after installing the fan in the pivot and stretch out from stator frame (1), install sealed lid (5) in slide bearing outside in, sealed lid and slide bearing's bearing frame (31) are covered and are sealed, the sealed lid that is close to the bearing frame side sets up the ring channel and regard as air supplementing chamber (6), the air supplementing chamber sets up the air supplementing hole and communicates with the external world through air supplementing pipe (7), a serial communication port, the bearing frame that is close to the fan side still is provided with bearing inner cup (8), bearing inner cup sets up the notch and regard as sealing chamber (9), sealing chamber and air supplementing chamber pass through clearance intercommunication, and install blast apparatus (10) with external gas blowing in air supplementing chamber and sealing chamber at air supplementing pipe entrance.

2. A new end cap bearing generator according to claim 1, characterized in that an air filter device (11) is provided on the blowing device.

3. The novel end cap bearing generator of claim 2 wherein said air filtration means is a screen.

4. The novel end cover type bearing generator according to claim 1, wherein gas pressure sensors are arranged at the inlet of the gas supplementing pipe and in the area, close to the sliding bearing, inside the stator base, the gas pressure sensors are in signal connection with a controller arranged on the stator base, and the controller receives signals of the gas pressure sensors and sends control signals to the blowing device to control the rotating speed of the blowing device.

5. The novel end cap bearing generator of any one of claims 1-4 wherein the air blower device is a fan device.

6. A new end cap bearing generator according to any of claims 1-4, characterized in that a first exhaust valve (12) is provided on the bearing housing.

7. The novel end cover bearing generator as claimed in any one of claims 1 to 4, wherein the air supply chamber is provided with two air supply holes, one of the air supply holes is communicated with the outside through one air supply pipe, and the other air supply hole is provided with a second exhaust valve (13).

8. The novel end cap bearing generator of any one of claims 1-4, wherein the air supply tube is clamped to the seal cap by a clamping joint.