Vertical motor lower rack bearing top sealing structure

Abstract

The utility model discloses a vertical motor lower frame bearing top sealing structure, which comprises a sealing cover, a sealing seat, a first respirator and a second respirator, the sealing cover is annular, the sealing seat is tubular, a sliding rotor, the sealing seat and the sealing cover are sequentially sleeved from inside to outside, the sealing cover is connected onto a lower frame, and the first respirator is connected with the second respirator. A bearing sleeving the sliding rotor is located in a bearing chamber defined by the sliding rotor, the sealing seat, the sealing cover and the lower rack, the first respirator and the second respirator are located in the external environment, the bearing chamber and the first respirator are communicated through an oil mist discharging pipe, a groove is formed in the face, making contact with the sliding rotor, of the sealing seat, and the groove and the sliding rotor are matched to form an auxiliary cavity. And the auxiliary cavity is communicated with the second respirator through an air balance pipe. Gas with oil mist in the bearing chamber is filtered and then discharged into the external environment, the oil mist is collected in a centralized mode, the oil mist is prevented from polluting the environment, air sucked by negative pressure in the motor is filtered clean atmosphere, and the gas with the oil mist in the bearing chamber is prevented from being sucked into the motor.

Description

Technical Field

[0001] This utility model belongs to the field of vertical motor technology, specifically a sealing structure for the top of the bearing of the lower frame of a vertical motor. Background Technology

[0002] The lower frame refers to the supporting component located at the bottom of the rotor of a vertical hydroelectric generator, connecting it to the foundation. It is typically used to install thrust bearings and lower guide bearings. Currently, most large-scale hydroelectric projects use a fixed labyrinth seal structure for the top seal of the lower frame bearing. Because the motor speed in large-scale hydroelectric projects is usually relatively low, the top seal of the bearing is typically designed to be simple. Furthermore, the motor's internal airflow structure is closed, making it prone to negative pressure at the top seal location, leading to oil mist leakage.

[0003] After prolonged motor operation, the bearing oil temperature rises, causing the internal lubricating oil to churn and form oil mist. Simultaneously, the top seal of the lower frame bearing is located in the negative pressure zone of the motor's airflow path, making it prone to drawing in the oil mist. Over time, this oil mist leaks into the atmosphere along the top seal gap of the lower frame bearing. Because the lower frame has housing components such as motor couplings, the leaked oil mist condenses into oil droplets, eventually causing lubricating oil leakage to appear on the motor end cover. This affects the on-site operating environment, increases the difficulty of motor maintenance and cleaning, and raises the on-site operating costs of the main unit. Utility Model Content

[0004] To address the aforementioned problems in existing technologies, the purpose of this utility model is to provide a sealing structure for the top of the bearing of a vertical motor's lower frame. This structure achieves a more reasonable air pressure balance within the bearing chamber. Oil-mist-laden gas within the bearing chamber is filtered through a breather before being discharged into the external environment, reducing pollution. The oil mist is collected by an oil mist collection cup, preventing leakage and environmental pollution. The oil mist collection cup can be replaced and cleaned periodically. The negative pressure area inside the motor achieves better gas balance. The air drawn in under negative pressure is filtered, clean atmospheric air, preventing oil mist contamination inside the motor and preventing oil-mist-laden gas from being drawn into the negative pressure area inside the motor.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A sealing structure for the top of the bearing of the lower frame of a vertical motor includes a sealing cover, a sealing seat, a first breather, and a second breather. The sealing cover is annular, and the sealing seat is tubular. The sliding rotor, the sealing seat, and the sealing cover are sequentially fitted from the inside to the outside. The sealing cover is connected to the lower frame. The bearing, fitted outside the sliding rotor, is located in the bearing chamber formed by the sliding rotor, the sealing seat, the sealing cover, and the lower frame. The first breather and the second breather are located in the external environment of the motor. The bearing chamber and the first breather are connected through an oil mist discharge pipe. The side of the sealing seat that contacts the sliding rotor has a groove. The groove and the sliding rotor cooperate to form an auxiliary cavity. The auxiliary cavity and the second breather are connected through an air balance pipe.

[0007] As a further improvement to the above technical solution:

[0008] The sealing seat contacts the sliding rotor, which can rotate relative to the sealing seat. The side of the sealing seat that contacts the sliding rotor has at least two grooves. Each groove is arranged along the central axis of the sliding rotor. Each groove and the sliding rotor cooperate to form an auxiliary cavity. The auxiliary cavity furthest from the bearing chamber is connected to the second breather through an air balance tube.

[0009] The sealing cap is funnel-shaped.

[0010] The sealing cover is provided with an oil mist discharge hole that is a through hole connecting to the bearing chamber. One end of the oil mist discharge pipe is connected to the oil mist discharge hole, and the other end is connected to the first breather.

[0011] The sealing seat is provided with an air balance hole that is a through hole for connecting the auxiliary chamber. One end of the air balance tube is connected to the air balance hole and the other end is connected to the second respirator.

[0012] There are at least two oil mist discharge pipes, each connected to a first breather, and each oil mist discharge pipe is arranged around the circumference of the sealing cover.

[0013] There are at least two air balance tubes, each connected to a second respirator, and each air balance tube is arranged around the sealing seat.

[0014] The sealing structure also includes a first oil mist collecting cup and a second oil mist collecting cup. Each first oil mist collecting cup is used in conjunction with a first breather to collect oil coming out of the first breather, and each second oil mist collecting cup is used in conjunction with a second breather.

[0015] The oil mist discharge pipe is connected to the first breather through a connector, and the air balance pipe is also connected to the second breather through a connector. Each connector is installed on the motor cover plate, which isolates the inside of the motor from the external environment. The connectors are fixed to the motor cover plate with lock nuts.

[0016] The beneficial effects of this utility model are:

[0017] (1) The air pressure balance in the bearing chamber is more reasonable. The oil mist gas in the bearing chamber is filtered by the breather and then discharged into the external environment, reducing the pollution to the external environment. The oil mist is collected by the oil mist collection cup to avoid oil mist leakage and environmental pollution. The oil mist collection cup can be replaced and cleaned regularly.

[0018] (2) The negative pressure area inside the motor can achieve a better gas balance. The air drawn in by the negative pressure is a filtered clean atmosphere, which will not cause oil mist pollution inside the motor and prevent the oil mist gas in the bearing chamber from being drawn into the negative pressure area inside the motor.

[0019] (3) The sealing seat is a multi-chamber sealing structure with multiple auxiliary chambers, which increases the bearing sealing capacity. The top auxiliary chamber is connected to the external environment through the gas balance tube and the second breather, so that the negative pressure area inside the motor will not draw in the oil mist gas in the bearing chamber, but draw in the external environment gas. The drawn gas is filtered by the second oil mist collection cup and the second breather, which further improves the cleanliness of the gas drawn into the motor.

[0020] (4) The on-site operation and maintenance of the main equipment is more stable and continuous, reducing the risk of downtime. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of another embodiment of the present invention. Detailed Implementation

[0023] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0024] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0025] A sealing structure for the top of the bearing of the lower frame of a vertical motor, such as Figure 1 and 2 As shown, the motor includes a lower frame 1, a motor cover 2, a sliding rotor 3, bearings, and other components. The bearings (not shown in the figure) are fitted onto the outside of the sliding rotor 3. The motor has an internal space, referred to as "motor interior a" in the figure. Correspondingly, the external environment in which the motor is located is referred to as "motor environment b" in the figure. The motor cover 2 is fitted onto the lower frame 1, and the motor cover 2 and the lower frame 1 separate the motor interior a from the external environment b. Obviously, the motor cover 2 and the lower frame 1 are only part of the interface separating the motor interior a and the external environment b.

[0026] The sealing structure includes a sealing cover 4, a sealing seat 5, an oil mist discharge pipe 7, a first breather 9, a second breather 10, a first oil mist collection cup 11, a second oil mist collection cup 12, and an air balance pipe 14.

[0027] The sealing seat 5 is tubular or cylindrical, and the sealing cover 4 is annular, or more specifically, trumpet-shaped. In other words, the sealing cover 4 has an inner diameter and an outer diameter, corresponding to the inner and outer side walls. The inner side wall of the sealing cover 4 connects to the sealing seat 5, and the outer side wall connects to the lower frame 1. The sliding rotor 3, sealing seat 5, and sealing cover 4 are sequentially fitted from the inside out, with the sealing seat 5 and sealing cover 4 located on side a inside the motor. After connection in the above manner, the bearing is located in the bearing chamber 15 formed by the sliding rotor 3, sealing seat 5, sealing cover 4, and lower frame 1.

[0028] The bearing chamber 15 contains lubricating oil for lubricating the bearing. As the bearing rotates, the temperature in the bearing chamber 15 will rise to a certain extent, and the lubricating oil will evaporate to a certain extent, generating oil mist in the bearing chamber 15. To discharge the oil mist from the bearing chamber 15, an oil mist discharge pipe 7, a first breather 9, and a first oil mist collection cup 11 are provided. The first breather 9 is located in the external environment b of the motor, and the bearing chamber 15 and the first breather 9 are connected through the oil mist discharge pipe 7. Specifically, the sealing cover 4 has an oil mist discharge hole 6 that is a through hole connecting to the bearing chamber 15. One end of the oil mist discharge pipe 7 is connected to the oil mist discharge hole 6, and the other end is connected to the first breather 9. The oil mist discharge pipe 7 is connected to the first breather 9 through a connector 8. The connector 8 is installed on the motor cover plate 2 and is fixed to the motor cover plate 2 by a locking nut 17. The connector 8 has a through hole, and the two ends of the through hole are connected to the oil mist discharge pipe 7 and the first breather 9, respectively. The first oil mist collection cup 11 and the first breather 9 cooperate to collect the oil coming out of the first breather 9. The first oil mist collecting cup 11 surrounds the first breather 9, forming an arrangement that encloses the first breather 9 to receive the oil coming out of the first breather 9.

[0029] Preferably, an oil mist discharge pipe 7, a first breather 9, and a first oil mist collection cup 11 form a set of oil mist collection components, and at least one set of oil mist collection components is provided, with each set of oil mist collection components arranged at intervals along the circumference of the sealing cover 4.

[0030] To ensure that the sealing seat 5 does not obstruct the rotation of the sliding rotor 3, i.e., the sliding rotor 3 can rotate relative to the sealing seat 5, the sealing seat 5 can only contact the outer surface of the sliding rotor 3; the two cannot be fixed together. Clearly, this arrangement of the sealing seat 5 and the sliding rotor 3 creates a gap at their contact surfaces that allows air to pass through. However, during motor operation, the rotation of the sliding rotor 3, etc., creates a negative pressure inside the motor (a), which has the effect of drawing in the bearing chamber 15. That is, the generated negative pressure causes oil-mist-laden gas in the bearing chamber 15 to enter the motor interior (a) through the gap between the sealing seat 5 and the sliding rotor 3.

[0031] To prevent oil mist from entering the motor's interior, a second breather 10, a second oil mist collection cup 12, and an air balance pipe 14 are installed. Figure 2 As shown, a groove is provided on the side of the sealing seat 5 that contacts the sliding rotor 3. The groove and the sliding rotor 3, when engaged, form an auxiliary cavity 16, effectively acting as a cover over the opening of the groove on the surface of the sliding rotor 3. The auxiliary cavity 16 and the second breather 10 are connected via an air balance pipe 14. The structure and installation method of the second breather 10 are the same as those of the first breather 9; both are air filters. The second breather 10 is also located in the external environment b of the motor. The sealing seat 5 has an air balance hole 13, which is a through hole, connecting to the auxiliary cavity 16. One end of the air balance pipe 14 is connected to the air balance hole 13, and the other end is connected to the second breather 10. The air balance pipe 14 is also connected to the second breather 10 via a connector 8 mounted on the motor cover plate 2. The second oil mist collecting cup 12 cooperates with the second breather 10 to collect the oil exiting the second breather 10. The second oil mist collecting cup 12 surrounds the second breather 10, forming an arrangement that scoops up the second breather 10 to receive the oil exiting it.

[0032] Furthermore, the sealing seat 5 has at least two grooves on the side that contacts the sliding rotor 3. Each groove is arranged along the central axis of the sliding rotor 3. Each groove and the sliding rotor 3 cooperate to form an auxiliary cavity 16. The auxiliary cavity 16 furthest from the bearing chamber 15 is connected to the second respirator 10 through the air balance tube 14.

[0033] Preferably, an air balance tube 14, a second breather 10 and a second oil mist collection cup 12 are used together to form an air balance assembly. At least one air balance assembly is provided, and each air balance assembly is arranged at intervals along the circumference of the sealing seat 5.

[0034] The gas balance component and the oil mist collection component can be arranged alternately.

[0035] The first oil mist collecting cup 11 and the second oil mist collecting cup 12 can be oil mist collectors in the prior art.

[0036] Based on the above structure, the working principle and process of this utility model are as follows: On the one hand, when the motor is running, the oil mist-laden gas in the bearing chamber 15 is introduced into the oil mist discharge pipe 7 by the stirring action generated by the motor rotation. After being filtered by the first breather 9, the clean gas enters the external environment b, and the oil mist is condensed and collected in the first oil mist collection cup 11. On the other hand, due to the negative pressure inside the motor a, the gas in the gap between the sealing seat 5 and the sliding rotor 3 is drawn into the motor a. Since the top auxiliary chamber 16 and the second breather 10 are connected through the gas balance pipe 14, the relatively clean gas in the external environment b is filtered by the second oil mist collection cup 12 to remove oil mist and the second breather 10, and then enters the bottom auxiliary chamber 16 through the gas balance pipe 14, and is then drawn into the motor a. In this way, the gas entering the motor a is filtered clean gas, preventing the oil mist-laden gas in the bearing chamber 15 from being drawn into the motor a. In addition, the arrangement of multiple auxiliary chambers 16 is equivalent to forming a multi-level protection. Specifically, even if the oil mist-containing gas in the bearing chamber 15 has a tendency to leak into the motor interior a through the gap between the sealing seat 5 and the sliding rotor 3, it will obviously first enter the auxiliary chamber 16 closest to the bearing chamber 15. The higher up (away from the bearing chamber 15) the auxiliary chamber 16 contains less oil mist-containing gas. That is, the topmost auxiliary chamber 16 (the auxiliary chamber 16 connected to the air balance pipe 14) contains relatively clean external gas without oil mist. This greatly reduces the probability of oil mist in the bearing chamber 15 entering the motor interior a.

[0037] Finally, it is necessary to state that the above embodiments are only used to further illustrate the technical solution of this utility model in detail, and should not be construed as limiting the scope of protection of this utility model. Any non-essential improvements and adjustments made by those skilled in the art based on the above content of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A vertical motor lower frame bearing top sealing structure, characterized in that, The sealing structure comprises a sealing cover (4), a sealing seat (5), a first breather (9) and a second breather (10), the sealing cover (4) is annular, the sealing seat (5) is tubular, the sliding rotor (3), the sealing seat (5) and the sealing cover (4) are sequentially sleeved from inside to outside, the sealing cover (4) is connected to the lower rack (1), the bearing located outside the sliding rotor (3) is located in a bearing chamber (15) surrounded by the sliding rotor (3), the sealing seat (5), the sealing cover (4) and the lower rack (1), the first breather (9) and the second breather (10) are located in an external environment (b) of the motor, the bearing chamber (15) and the first breather (9) are communicated through an oil mist discharging pipe (7), one side of the sealing seat (5) contacting the sliding rotor (3) is provided with a groove, the groove and the sliding rotor (3) cooperate to form an auxiliary cavity (16), the auxiliary cavity (16) and the second breather (10) are communicated through an air balance pipe (14).

2. The seal structure of claim 1, wherein: The sealing seat (5) contacts the sliding rotor (3), the sliding rotor (3) can rotate relative to the sealing seat (5), one side of the sealing seat (5) contacting the sliding rotor (3) is provided with at least two grooves, each groove is arranged along the central axis direction of the sliding rotor (3), each groove and the sliding rotor (3) cooperate to form an auxiliary cavity (16), the auxiliary cavity (16) farthest from the bearing chamber (15) and the second breather (10) are communicated through the air balance pipe (14).

3. The seal structure of claim 1, wherein: The sealing cover (4) is trumpet-shaped.

4. The seal structure of claim 1, wherein: The sealing cover (4) is provided with an oil mist discharging hole (6) which is a through hole and communicates the bearing chamber (15), one end of the oil mist discharging pipe (7) is connected to the oil mist discharging hole (6) and the other end is connected to the first breather (9).

5. The sealed structure of claim 1, wherein: The sealing seat (5) is provided with an air balance hole (13) which is a through hole and communicates the auxiliary cavity (16), one end of the air balance pipe (14) is connected to the air balance hole (13) and the other end is connected to the second breather (10).

6. The sealed structure of claim 1, wherein: The oil mist discharging pipe (7) is provided with at least two, each oil mist discharging pipe (7) is connected to one first breather (9), and each oil mist discharging pipe (7) is arranged along the circumference of the sealing cover (4).

7. The sealed structure of claim 1, wherein: The air balance pipe (14) is provided with at least two, each air balance pipe (14) is connected to one second breather (10), and each air balance pipe (14) is arranged along the circumference of the sealing seat (5).

8. The sealed structure of claim 1, wherein: The sealing structure further comprises a first oil mist collecting oil cup (11) and a second oil mist collecting oil cup (12), each first oil mist collecting oil cup (11) and one first breather (9) cooperate to collect oil from the first breather (9), and each second oil mist collecting oil cup (12) and one second breather (10) cooperate.

9. The sealed structure of claim 1, wherein: The oil mist discharging pipe (7) communicates the first breather (9) through a joint (8), the air balance pipe (14) also communicates the second breather (10) through a joint (8), each joint (8) is installed on the motor cover plate (2), the motor cover plate (2) separates the internal environment (a) of the motor and the external environment (b), and the joint (8) is fixed on the motor cover plate (2) through a locking nut (17).

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