Air Acceleration Sealing Device

Abstract

The present invention provides an air acceleration sealing device, wherein a ring-shaped sealing body is fixed on the outer peripheral side of the sealing surface of a rotating shaft, the axial inner side of the sealing body is an oil groove, and a plurality of acceleration sealing units are arranged between the sealing body and the rotating shaft, wherein the acceleration sealing unit is fixed on the rotating shaft and rotates synchronously with the rotating shaft; the acceleration sealing unit, the rotating shaft and the sealing body form a first annular groove cavity, wherein the acceleration sealing unit and the sealing body have a gap on the side close to the oil groove, so that the first annular groove cavity is connected with the oil groove, and the acceleration sealing unit has a plurality of inclined blades in the first annular groove cavity, wherein the blades rotate with the rotating shaft, so that the air in the first annular groove cavity is concentrated toward the gap. The inclination direction of the blades on the acceleration sealing unit of the present invention is the same as the rotation direction of the rotating shaft, and the blades are evenly distributed on the main body of the acceleration sealing unit. Under the rotation of the rotating shaft, the acceleration sealing unit generates centrifugal fluid wind pressure, so that the oil mist in the oil groove is difficult to escape outward.

Description

Technical Field

[0001] The invention relates to an air acceleration sealing device, which is mainly used for sealing the rotating shaft bearing of a large generator set. Background Art

[0002] At present, the sealing forms of large rotating mechanical equipment include labyrinth type, contact type, comb tooth type and other sealing forms, but it is inevitable that large rotating mechanical bearing oil tanks will have oil spillage, oil leakage and oil mist escape. The escaped oil mist will have a greater negative impact on the operating environment of the generator. Summary of the invention

[0003] The object of the present invention is to provide an air acceleration sealing device capable of preventing oil mist from escaping.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] An air acceleration sealing device, characterized in that: an annular sealing body is fixed on the outer peripheral side of the sealing surface of the rotating shaft, the axial inner side of the sealing body is an oil groove, and a plurality of acceleration sealing units are arranged between the sealing body and the rotating shaft, and the acceleration sealing units are fixed on the rotating shaft and rotate synchronously with the rotating shaft;

[0006] The accelerating sealing unit, the rotating shaft and the sealing body form a first annular groove cavity. The accelerating sealing unit and the sealing body have a gap on the side close to the oil groove, so that the first annular groove cavity is connected with the oil groove. The accelerating sealing unit has a plurality of inclined blades in the first annular groove cavity. The blades rotate with the rotating shaft, so that the air in the first annular groove cavity is concentrated to the gap.

[0007] The air acceleration sealing device, wherein: an air supply inlet is provided on the axial outer side of the first annular groove cavity, and a gas outlet is provided on the side of the first annular groove cavity radially adjacent to the sealing body, and the gas outlet is close to the gap; an air supply unit is also fixed on the sealing body, and the air supply unit is connected to the air supply inlet through an air supply pipeline.

[0008] The air acceleration sealing device, wherein: an active air supply control valve is provided on the air supply unit, and a first air pressure monitor is provided at the air supply inlet, and the first air pressure monitor is connected to the active air supply control valve signal.

[0009] The air acceleration sealing device, wherein: a second volute sealing chamber connected with the first annular groove chamber through a gas outlet is provided in the sealing body.

[0010] The air acceleration sealing device, wherein: an air diversion device is provided at the gas outlet, and the air diversion device includes multiple air guiding channels, so that the angle of the air flow blown out from the gas outlet is closer to the tangent direction of the volute edge of the second volute sealing chamber.

[0011] The air acceleration sealing device, wherein: an oil suction mist pipeline is provided on the outlet of the second volute sealing chamber, and the oil suction mist pipeline is connected to the first-stage outlet condenser.

[0012] The air acceleration sealing device, wherein: the oil suction mist pipeline is arranged along the tangent direction of the outlet of the second volute sealing chamber.

[0013] The air acceleration sealing device, wherein: an oil suction mist active control valve is provided on the oil suction mist pipeline, a second wind pressure monitor is provided at the outlet of the second volute sealing chamber, and the second wind pressure monitor is connected to the oil suction mist active control valve signal.

[0014] The air acceleration sealing device, wherein: a filter unit is provided inside the first-stage outlet condenser, and a gravity releaser is provided at the bottom of the first-stage outlet condenser.

[0015] The air acceleration sealing device, wherein: the outlet of the first-stage outlet condenser is connected to the second-stage outlet condenser.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the fan blades on the accelerating seal unit of the present invention are inclined in the same direction as the rotating direction of the shaft and are evenly distributed on the main body of the accelerating seal unit. Under the rotation of the shaft, the accelerating seal unit generates centrifugal fluid wind pressure, making it difficult for the oil mist in the oil tank to escape outward. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the plane distribution of the air acceleration sealing device;

[0018] Figure 2 This is a cross-sectional structural diagram of the acceleration sealing unit ( Figure 1 AA section view);

[0019] Figure 3 yes Figure 2 P-direction view;

[0020] Figure 4 Schematic diagram of the cross-sectional structure of the air supply path of the air acceleration sealing device ( Figure 1 BB profile);

[0021] Figure 5 Schematic diagram of the cross-sectional structure of the air outlet path of the air acceleration sealing device ( Figure 1 CC section view).

[0022] Explanation of the reference numerals in the accompanying drawings: 1 sealing body; 2 end face connecting bolts; 3 rotating shaft; 4 accelerating sealing unit; 5 fan blades; 6 air diversion device; 7 air supply unit; 8 primary outlet condenser; 9 air supply pipeline; 10 air supply active control valve; 11 first wind pressure monitor; 12 filter unit; 13 oil suction mist pipeline; 14 oil suction mist active control valve; 15 gravity releaser; 16 secondary outlet condenser; 17 first annular groove cavity; 18 second volute sealing cavity; 19 second wind pressure monitor; A oil tank. DETAILED DESCRIPTION

[0023] The present invention provides an air acceleration sealing device, such as Figure 1-Figure 5 As shown, a ring-shaped sealing body 1 is fixed on the outer peripheral side of the sealing surface of the rotating shaft 3, the axial inner side of the sealing body 1 is an oil groove A, the sealing body 1 is connected to the unit frame through the end surface connecting bolts 2, and a plurality of accelerating sealing units 4 are arranged between the sealing body 1 and the rotating shaft 3, and the accelerating sealing units 4 are fixed on the rotating shaft 3 and rotate synchronously with the rotating shaft 3;

[0024] The sealing body 1 and the accelerating sealing unit 4 are both made of lightweight materials, which not only meet the requirements of strength and hardness, but also facilitate the installation, adjustment, repair and maintenance of the product.

[0025] The accelerating seal unit 4, the rotating shaft 3 and the sealing body 1 form a first annular groove cavity 17. The accelerating seal unit 4 and the sealing body 1 have a gap on the side close to the oil groove A, so that the first annular groove cavity 17 is connected with the oil groove A. The accelerating seal unit 4 has a plurality of inclined blades 5 in the first annular groove cavity 17. The blades 5 rotate with the rotating shaft 3, so that the air in the first annular groove cavity 17 is concentrated at the gap, which can prevent the oil mist in the oil groove A from entering the first annular groove cavity 17 through the gap.

[0026] An air supply inlet is provided on the axial outer side of the first annular groove cavity 17, and a gas outlet is provided on the side of the first annular groove cavity 17 radially adjacent to the sealing body 1, and the gas outlet is close to the gap;

[0027] An air supply unit 7 (such as a fan) is also fixed on the sealing body 1. The air supply unit 7 is connected to the air supply inlet through an air supply pipeline. An air supply active control valve 10 is provided on the air supply unit 7. A first air pressure monitor 11 is provided at the air supply inlet. The first air pressure monitor 11 is in signal communication with the air supply active control valve 10.

[0028] The sealing body 1 is provided with a second volute sealing chamber 18 which is connected with the first annular groove chamber 17 through a gas outlet, and an air diversion device 6 is provided at the gas outlet. Figure 3As shown, the air diversion device 6 includes a plurality of air guide channels, so that the angle of the air flow blown out from the gas outlet is closer to the tangent direction of the volute edge of the second volute sealing chamber 18;

[0029] An oil suction mist pipeline 13 is tangentially provided at the outlet of the second volute sealed chamber 18, and the oil suction mist pipeline 13 is connected to the primary outlet condenser 8, and an oil suction mist active control valve 14 is provided on the oil suction mist pipeline 13. A second wind pressure monitor 19 is provided at the outlet of the second volute sealed chamber 18, and the second wind pressure monitor 19 is signal-connected to the oil suction mist active control valve 14;

[0030] A filtering unit 12 is provided in the primary outlet condenser 8 , a gravity releaser 15 is provided at the bottom of the primary outlet condenser 8 , and the outlet of the primary outlet condenser 8 is connected to a secondary outlet condenser 16 .

[0031] When the present invention is used, the sealing body 1 and the accelerating sealing unit 4 rotate together with the rotating shaft 3, and the air in the first annular groove cavity 17 generates a wind pressure fluid seal under the action of centrifugal force, which can limit the oil mist from escaping into the first annular groove cavity 17. If the first wind pressure monitor 11 senses that the air pressure in the first annular groove cavity 17 is insufficient (or at a certain time interval), the air supply active control valve 10 is started and closed in time, and the wind pressure sent into the first annular groove cavity 17 by the air supply unit 7 and the wind pressure generated by the accelerating sealing unit 4 drive the escaping oil mist to enter the second volute sealing cavity 18 together, so that the second volute sealing cavity 18 forms a certain pressure, making it difficult for the oil mist in the oil tank A to enter the first annular groove cavity 17, thereby playing a role of wind pressure sealing;

[0032] When the second wind pressure monitor 19 senses that the air pressure in the second volute sealing chamber 18 is high (or at a certain time interval), the oil mist suction active control valve 14 is started and closed in time, and the first-level outlet condenser 8 works to suck the oil mist into the first-level outlet condenser 8 for processing. After being filtered by the filter unit 12 contained in the first-level outlet condenser 8, the clean air is guided to the second-level outlet condenser 16 for observation through the air outlet connected to the outside of the first-level outlet condenser 8, and the filtered oil returns to the oil tank A through the gravity releaser 15 on the bottom side of the first-level outlet condenser 8.

[0033] It can be seen that the inclination direction of the fan blades 5 on the acceleration sealing unit 4 of the present invention is the same as the rotation direction of the shaft 3, and they are evenly distributed on the main body of the acceleration sealing unit 4. Under the rotation of the shaft 3, the acceleration sealing unit 4 generates centrifugal fluid wind pressure, making it difficult for the oil mist in the oil tank A to escape outward. An air diversion device 6 is provided on the sealing body 1 near the side of the acceleration sealing unit 4. When the acceleration sealing unit 4 generates wind pressure through centrifugal action, the wind pressure will smoothly enter the second volute sealing chamber 18 through the air diversion device 6. The second volute sealing chamber 18 will transport most of the gas to the first-stage outlet condenser 8 through the oil mist suction pipeline 13, and the remaining part of the gas will remain in the second volute sealing chamber 18 to form a fluid seal to prevent the oil mist in the oil tank A from escaping.

[0034] An air supply unit 7 is provided on the sealing body 1, and the air supply unit 7 is connected to the sealing body 1 through an air supply pipeline. The gas supplied by the air supply unit 7 enters the first annular groove cavity 17 through the air supply pipeline, and then enters the accelerating sealing unit 4 through the first annular groove cavity 17, and enters the second volute sealing cavity 18 together with the wind pressure generated by the accelerating sealing unit 4. A wind pressure monitor and an active air supply control valve 10 are provided near the first annular groove cavity 17 of the air supply unit 7, which can keep the pressure of the entire device always within the set value range.

[0035] A primary outlet condenser 8 is provided at the air outlet of the sealing body 1. The primary outlet condenser 8 is connected to the air outlet of the sealing body 1 through an oil mist suction pipeline 13. The air inlet of the primary outlet condenser 8 is connected to the air outlet of the second volute sealed chamber 18. The air outlet of the primary outlet condenser 8 is connected to the secondary outlet condenser 16. Most of the gas in the second volute sealed chamber 18 enters the primary outlet condenser 8 through the oil mist suction pipeline 13 for treatment. A filter unit 12 is provided inside the primary outlet condenser 8. After the oil mist is filtered by the filter unit 12, the oil is returned to the oil tank A through the gravity releaser 15 below the primary outlet condenser 8. The filtered clean air enters the secondary outlet condenser 16 for centralized treatment again. An oil mist suction active control valve 14 and a wind pressure monitor are provided on the side of the oil mist suction pipeline 13 close to the second volute sealed chamber 18 to keep the pressure in the entire device always within the set value range.

Claims

1. An air acceleration sealing device, characterized in that: An annular sealing body is fixed on the outer peripheral side of the sealing surface of the rotating shaft, the axial inner side of the sealing body is an oil groove, and a plurality of accelerating sealing units are arranged between the sealing body and the rotating shaft, and the accelerating sealing units are fixed on the rotating shaft and rotate synchronously with the rotating shaft; The accelerating seal unit, the rotating shaft and the sealing body form a first annular groove cavity, the accelerating seal unit and the sealing body have a gap on the side close to the oil groove, so that the first annular groove cavity is connected with the oil groove, the accelerating seal unit has a plurality of inclined blades in the first annular groove cavity, the blades rotate with the rotating shaft, so that the air in the first annular groove cavity is concentrated to the gap, the first annular groove cavity is provided with an air supply inlet on the axial outer side, and the first annular groove cavity is provided with a gas outlet on the side radially adjacent to the sealing body, and the gas outlet is close to the gap; An air supply unit is also fixed on the sealing body, and the air supply unit is connected with the air supply inlet through an air supply pipeline; a second volute sealing chamber connected with the first annular groove chamber through the gas outlet is provided in the sealing body, and an air diversion device is provided at the gas outlet, and the air diversion device includes a plurality of air guiding channels, so that the angle of the air flow blown out from the gas outlet is close to the tangent direction of the volute edge of the second volute sealing chamber.

2. The air acceleration sealing device according to claim 1, characterized in that: An active air supply control valve is provided on the air supply unit, and a first air pressure monitor is provided at the air supply inlet. The first air pressure monitor is in signal communication with the active air supply control valve.

3. The air acceleration sealing device according to claim 1, characterized in that: An oil mist suction pipeline is provided at the outlet of the second volute sealing chamber, and the oil mist suction pipeline is connected to the first-stage outlet condenser.

4. The air acceleration sealing device according to claim 3, characterized in that: The oil suction mist pipeline is arranged along the tangent direction of the outlet of the second volute sealing chamber.

5. The air acceleration sealing device according to claim 3, characterized in that: An oil suction mist active control valve is provided on the oil suction mist pipeline, and a second wind pressure monitor is provided at the outlet of the second volute sealing chamber. The second wind pressure monitor is connected to the oil suction mist active control valve signal.

6. The air acceleration sealing device according to claim 3, characterized in that: A filtering unit is arranged inside the first-stage outlet condenser, and a gravity releaser is arranged at the bottom of the first-stage outlet condenser.

7. The air acceleration sealing device according to claim 6, characterized in that: The outlet of the primary outlet condenser is connected to the secondary outlet condenser.

Images