A device for supporting a rotor with a liquid-assisted sealed air cushion

Abstract

The present invention discloses a device for a liquid-assisted sealed air cushion to support a rotor. The present invention utilizes the centrifugal force acting on the lift disc during rotation, and the liquid assists in sealing the air cushion, reducing the gas leakage amount. Compared with sealing forms such as carbon rings, the sealing effect is better and the cost is lower. Specifically, after the lift disc rotates, the liquid enters the liquid sealing cavity. Under the action of the centrifugal force of the liquid and the hindering effect of the liquid and the gas-blocking packing, the liquid assists in sealing the air cushion, which can reduce the gas leakage amount in the air cushion chamber. The present invention realizes the function of sealing the air cushion well at low cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of air-cushion supported rotor equipment, and particularly relates to a device for a liquid-assisted sealed air-cushion supported rotor. Background Art

[0002] There are patents with patent numbers: 202310559977.6 A synchronous and stable sealed frame-type air-cushion flywheel energy storage device, 202410323113.9 An air-cushion flywheel energy storage device, 202411271154.4 An air-cushion chamber and air-cushion flywheel device using a split-type lift plate, 202421788504.X An air-cushion supported rotor device with a radial bearing above the air-cushion chamber. In the air-cushion devices for supporting the rotor, various combined sealing devices are used between the lift plate and the air-cushion wall. Usually, a labyrinth seal, which is cheap but has a poor sealing effect, is used on the outside, and a carbon ring seal, which is expensive but has a good sealing effect, is used on the inside. There are contradictions such as good sealing effect but high cost, high cost for later maintenance, poor sealing effect for low-cost ones, and relatively poor air-cushion load-bearing capacity and air-pressure energy-saving ability. Therefore, a more optimized solution is needed to solve the contradictions in the prior art.

[0003] Currently, for the air-cushion sealing device for supporting the rotor, only the patent "Publication No. CN101788034A Flywheel Floating on an Air-Cushion" uses a liquid centrifugal sealing device, but this sealing device has design defects.

[0004] First of all, when the device is stationary, the liquid will flow down, and the flowing-down liquid cannot rise up again to play a sealing role.

[0005] Secondly, for the air-cushion device, high-pressure air should be pumped into the air-cushion first. After the high-pressure air supports the air-cushion, the rotor rotates. However, in this solution, since the rotor has not rotated yet, the liquid cannot play a sealing role, and the pumped high-pressure air will push out the liquid, so that the sealing cannot be achieved, and thus an air-cushion cannot be formed.

[0006] Thirdly, this device is only sealed by a liquid centrifugal sealing device. When the air pressure is very high, it may not be able to be sealed only by the liquid centrifugal force.

[0007] Finally, this sealing device does not explain the difference in smoothness between the surfaces of the rotating parts and the non-rotating parts of the liquid seal. Because the liquid centrifugal force is relied on to play a sealing role, the surface of the rotating parts must be non-smooth, and the surface of the non-rotating parts is smooth, so as to drive the liquid to rotate at a high speed and generate centrifugal force. Summary of the Invention

[0008] (1)Technical problem to be solved: In view of the contradiction in the existing air cushion devices that the combined various sealing devices between the lift plate and the air cushion wall have high cost for good sealing effect and also high later maintenance cost, while those with low cost have poor sealing effect, and the air cushion's load-bearing capacity and ability to save air pressure energy are also relatively poor, the present invention provides a device for liquid-assisted sealing and supporting a rotor in an air cushion.

[0009] (2)The technical solution adopted by the present invention is as follows:

[0010] A device for liquid-assisted sealing and supporting a rotor in an air cushion, comprising a rotor, a rotor shaft, an air compressor, an air cushion wall, and a lift plate located inside the air cushion wall. A sealing chassis is provided at the bottom of the air cushion wall. A rotary sealing device is provided between the lift plate and the air cushion wall. The air cushion wall, the lift plate, and the sealing chassis enclose an air cushion chamber. The air compressor supplies air to the air cushion chamber. The lift plate is connected to the rotor through the rotor shaft. The rotary sealing device includes an inner rotary sealing device and an outer liquid sealing device. The liquid sealing device is a liquid sealing cavity provided between the top of the lift plate and the air cushion wall. The liquid sealing cavity is connected to a liquid supply device. When the lift plate rotates, the liquid supply device provides liquid to the liquid sealing cavity. The surface of the air cushion wall in the liquid sealing cavity is smoother than the surface of the lift plate. The lift plate drives the liquid to rotate, and the liquid seals the gas in the air cushion chamber in the liquid sealing cavity.

[0011] A further technical solution lies in that a gas-blocking filler is provided in the liquid sealing cavity.

[0012] A further technical solution lies in that there is a gas-blocking brush in the liquid sealing cavity.

[0013] A further technical solution lies in that the outer height of the liquid sealing cavity is higher than the inner height in the radial direction.

[0014] A further technical solution lies in that heat dissipation fins are also installed on the upper part of the air cushion wall.

[0015] A further technical solution lies in that the liquid supply device is a liquid storage tank or a water tank with a pump.

[0016] A further technical solution lies in that the liquid sealing cavity is a horizontally arranged U-shaped cavity structure formed between the outer side of the top of the lift plate and the air cushion wall.

[0017] A further technical solution lies in that the liquid storage tank is located at the lower part of the liquid sealing cavity of the U-shaped cavity structure, and there are blades fixed on the lift plate in the liquid storage tank.

[0018] A further technical solution lies in that the water tank with a pump is connected to a conveying pipeline. The outlet of the conveying pipeline is communicated with the liquid sealing cavity. The water tank with a pump is used to inject liquid into the liquid sealing cavity. A liquid receiving groove is provided on the air cushion wall below the liquid sealing cavity. The liquid receiving groove is connected to the water tank with a pump through a recovery pipeline, and can pump the liquid in the liquid receiving groove back to the water tank with a pump.

[0019] Further technical solution lies in that the air cushion wall is composed of a split inner air cushion wall and an outer air cushion wall. The outer air cushion wall is on the outside of the inner air cushion wall. An inner layer rotary seal device is provided between the inner air cushion wall and the lift disk, and a liquid seal cavity is arranged between the outer air cushion wall and the lift disk.

[0020] (3) Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: When the lift disk rotates, under the action of centrifugal force of the liquid and the hindrance effect of the liquid and the air-blocking packing, the present invention uses the liquid to assist in sealing the air cushion, reducing the gas leakage amount. Compared with sealing forms such as carbon rings, the sealing effect is better, and the later maintenance is simple and the cost is lower. Specifically, after the lift disk rotates, the liquid enters the liquid seal cavity. Under the action of the centrifugal force of the liquid and the hindrance effect of the liquid and the air-blocking packing, the liquid is used to assist in sealing the air cushion, which can reduce the gas leakage amount in the air cushion chamber. In addition, the rotary seal device is composed of an inner layer rotary seal device and an outer layer liquid seal device; due to the adoption of two-stage sealing and the presence of the inner layer rotary seal device at the front end of the liquid seal device, the air cushion can be pressurized by inflating first. After the rotor rotates, the inner layer rotary seal device and the liquid centrifugal seal device at the rear end jointly play a sealing role, and the design is more reasonable and the sealing pressure is higher. Description of the Drawings

[0021] Figure 1 It is the overall structural schematic diagram of the lift disk when it does not rotate in Embodiment 1 of the present invention;

[0022] Figure 2 It is the overall structural schematic diagram of the lift disk when it rotates in Embodiment 1 of the present invention;

[0023] Figure 3 It is Figure 2 The enlarged view of part A in

[0024] Figure 4 It is the overall structural schematic diagram of Embodiment 2 of the present invention;

[0025] Figure 5 It is Figure 4 The enlarged view of part B in

[0026] Figure 6 It is Figure 5 The structural schematic diagram of the air-blocking brush in

[0027] Figure 7 It is the overall structural schematic diagram of Embodiment 3 of the present invention;

[0028] Figure 8 It is the structural schematic diagram of the central ring, support spokes and outer ring in Embodiment 3 of the present invention;

[0029] Figure 9 It is Figure 7Enlarged view at position C in [the figure];

[0030] Figure 10 is Figure 9 Schematic diagram of the air-blocking brush structure in [the figure];

[0031] Figure 11 is Figure 10 Schematic diagram of another perspective of the air-blocking brush structure;

[0032] Figure 12 Schematic diagram of the overall structure of Embodiment 4 of the present invention;

[0033] Figure 13 is Figure 12 Enlarged view at position D in [the figure];

[0034] Figure 14 is Figure 12 Enlarged view at position E in [the figure];

[0035] Figure 15 Schematic diagram of the overall structure when the lift pad rotates in Embodiment 4 of the present invention;

[0036] Figure 16 is Figure 15 Enlarged view at position F in [the figure].

[0037] Reference numerals: 1, air cushion wall; 2, inner layer rotary seal device; 3, lift pad; 4, electric / generator; 5, thrust bearing; 6, radial bearing; 7, rotor shaft; 8, liquid supply device; 9, lower rotary seal device; 10, thrust head; 11, motor frame; 12, housing; 13, stator; 14, rotor; 15, upper frame; 16, flexible gasket; 17, brake; 18, guide bearing; 19, base; 20, air cushion chamber; 21, sealing chassis; 22, air compressor; 23, axial bearing; 25, spring; 26, small thrust bearing; 29, bearing frame; 30, support disc; 80, liquid storage tank; 81, water tank with pump; 82, liquid seal cavity; 83, liquid; 85, liquid receiving groove; 86, labyrinth seal; 87, carbon ring seal; 88, honeycomb seal; 101, sealing wall; 102, outer ring; 103, support spoke; 105, center ring; 107, inner air cushion wall; 108, outer air cushion wall; 109, lower air cushion wall; 305, center body; 306, disc; 307, liquid contact plate; 141, rotor plate; 500, air-blocking filler; 501, blade; 502, air-blocking brush; 503, air-blocking brush baffle, 505, heat sink; 506, liquid cooling groove. Detailed implementation manners

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0039] As Figures 1 - 16as shown

[0040] Embodiment 1: A device for supporting a rotor with a liquid-assisted sealed air cushion, comprising a rotor 14, a rotor shaft 7, an air compressor 22, an air cushion wall 1, and a lifting disk 3 located inside the air cushion wall 1. An upper frame 15 is provided at the bottom of the air cushion wall 1. An inner layer rotary seal device 2 is provided between the lifting disk 3 and the air cushion wall 1. The air cushion wall 1, the lifting disk 3, and the upper frame 15 enclose an air cushion chamber 20. The air compressor 22 supplies air to the air cushion chamber 20. The lifting disk 3 is connected to the rotor 14 through the rotor shaft 7. A liquid seal chamber 82 is provided between the top of the lifting disk 3 and the air cushion wall 1. A liquid supply device 8 is connected to the liquid seal chamber 82. When the lifting disk 3 rotates, the liquid supply device 8 supplies liquid 83 to the liquid seal chamber 82, and the liquid 83 seals the gas inside the air cushion in the liquid seal chamber 82. This embodiment adopts a safety redundancy design, that is, both a gas-blocking packing 500 is provided and a liquid seal chamber 82 inclined inward is designed. However, in actual use, only one of them can be selected. For example, the gas-blocking packing 500 can be removed, and the air can be sealed only by the liquid seal chamber 82 inclined inward. In this embodiment, since the rotational speed is constant, a highly water-absorbent resin or gel can also be provided in the liquid seal chamber 82 to retain moisture.

[0041] In this embodiment, the rotor 14 is a rotor of a vertical generator or a water turbine generator. The well-known structure at the lower part of the vertical generator or the water turbine generator is not drawn in the figure. An upper frame 15 is fixedly provided above the stator 13 of the vertical generator or the water turbine generator. In this embodiment, the upper frame 15 replaces (or is equivalent to) the sealing chassis 21. The present invention is provided above the upper frame 15. In this embodiment, the upper frame 15 adopts a fully sealed structure of a metal disk. The air cushion wall 1 is formed by a sealing wall 101. The lifting disk 3 is formed by a disk 306. An inner layer rotary seal device 2 is provided between the air cushion wall 1 and the lifting disk 3. The inner layer rotary seal device 2 is a labyrinth seal 86. The air compressor 22 supplies air to the air cushion chamber 20. The rotor 14 is coaxially fixed with the rotor shaft 7. The rotor shaft 7 penetrates through the upper frame 15 and the lifting disk 3. A thrust head 10 is fixed on the upper part of the rotor shaft 7. The top of the lifting disk 3 contacts the lower part of the thrust head 10. There is a conical hole in the middle of the lifting disk 3. There is a flexible sealing gasket 16 between the lifting disk 3 in the conical hole and the rotor shaft 7. The flexible sealing gasket 16 ensures the sealing of the air cushion chamber 20. A thrust bearing 5 is provided between the lifting disk 3 and the upper frame 15. A guide bearing 18 is installed in the middle of the upper frame 15. A lower rotary seal device 9 is provided between the upper frame 15 and the rotor shaft 7. The lower rotary seal device 9 is a combination of two seal devices. The upper part is a labyrinth seal 86, and the lower part is a carbon ring seal 87. A housing 12 is provided above the upper frame 15, and the housing 12 covers the whole device.

[0042] There is a concave platform on the upper part of the lift plate 3, and the concave platform forms a liquid storage pool 80. Here, the liquid supply device 8 is the liquid storage pool 80, and there is liquid 83 in the liquid storage pool 80 when the rotor does not rotate. A liquid sealing cavity 82 is formed between the upper outer side of the lift plate 3 and the air cushion wall 1, and the liquid supply device 8 is connected to the liquid sealing cavity 82. The liquid sealing cavity 82 is specifically formed by the top of the air cushion wall 1 bending downward first and then upward in the direction from the outside to the inside. The outermost side of the lift plate 3 is fixed with an air blocking filler 500. The air blocking filler 500 can be composed of a fiber mass similar to a cotton ball, or can be composed of a wire ball mass formed by cutting wear-resistant plastic filaments together, or can be composed of a sponge-like material. The bottom of the air blocking filler 500 can be fixed on the lift plate 3 by means such as bonding or nailing. After the air blocking filler 500 is wetted by the liquid, the liquid 83 can flow but the gas is difficult to pass through. In this way, gas leakage can be reduced, and since the air blocking filler 500 is elastic, there will be no great pressure between it and the air cushion wall 1, and the wear-resistant material is not easily worn out. There is also a heat sink 505 on the top of the air cushion wall 1 above the air blocking filler 500 to dissipate heat from the liquid sealing cavity 82. The lower surface of the upper wall of the liquid sealing cavity 82 is smooth, and the lower wall of the liquid sealing cavity 82, that is, the upper side surface of the lift plate 3, is not smooth. In actual application, the surface of the lift plate 3 is preferably processed with radial micro-grooves to increase friction, so that the liquid 83 in the liquid sealing cavity 82 will rotate as the lift plate 3 rotates. When not rotating, the liquid 83 is in the liquid storage pool 80, and when the lift plate 3 rotates, the liquid 83 enters the liquid sealing cavity 82 from the liquid storage pool 80.

[0043] See Figure 3 , when the rotor 14 rotates, the liquid 83 enters the liquid sealing cavity 82 from the liquid storage pool 80 under the centrifugal force of the lift plate 3 and wets the air blocking filler 500. The air blocking filler 500 wetted by the liquid increases the difficulty of gas passing through. At the same time, more liquid can also use the liquid centrifugal force to increase the sealing effect, playing a sealing role in the gas leaked from the inner layer rotary sealing device 2 and reducing the gas leakage amount in the air cushion. Since the rotational speed of the rotor 14 of the vertical generator or the water turbine generator is fixed, the amount of the liquid 83 in the liquid storage pool 80 is also fixed.

[0044] Embodiment 2: Different from Embodiment 1, in this embodiment, the upper part is similar in structure to the air cushion device in the patent of "202421788504.X, an air cushion supported rotor device with a radial bearing above the air cushion chamber". The air cushion wall 1 is formed by the sealing wall 101. The lifting disc 3 is formed by the central body 305, the disc 306, and the liquid contact plate 307. The central body 305 is fixed in the middle of the disc 306. It is not convenient to process the lifting disc 3 as a whole, and it is easier to process the disc 306 and the central body 305 separately, and the central body 305 can have higher machining accuracy. The liquid contact plate 307 is fixed on the outer side of the upper part of the disc 306. The inner rotating seal device 2 between the air cushion wall 1 and the lifting disc 3 is a honeycomb seal 88. Above the central body 305, there is a support disc 30. The upper part of the support disc 30 is the rotor 14. Between the support disc 30 and the base 19, there is a bearing bracket 29. There is also a brake 17 below the rotor 14. There is a guide bearing 18 on the rotor shaft 7. There is a housing 12 on the base 19. An electric / generator 4 is installed on the upper part of the rotor shaft 7. There is also an air compressor 22 on the upper part of the housing 12. In this embodiment, the sealed base 19 replaces (or is equivalent to) the sealed chassis 21.

[0045] There is a pump-equipped water tank 81 on the base 19. Here, the liquid supply device 8 is the pump-equipped water tank 81. There is liquid 83 in the pump-equipped water tank 81. Several pump-equipped water tanks 81 can be installed and evenly distributed on the base 19; A gas blocking brush 502 is fixed on the outer side below the liquid contact plate 307. In this way, the gas blocking brush 502 can drive the liquid 83 to rotate and increase the difficulty of gas passing through, which is beneficial to improving the sealing performance. The liquid seal cavity 82 is formed by a horizontally placed U-shaped cavity structure between the upper side of the outer side of the liquid contact plate 307 and the air cushion wall 1. The lower surface of the upper wall of the liquid seal cavity 82 is smooth. There are blades 501 on the upper side of the liquid contact plate 307. The blades 501 can drive the liquid 83 in the liquid seal cavity 82 to rotate and increase the tendency of the liquid 83 to flow outward. The delivery pump of the pump-equipped water tank 81 is connected to a delivery pipeline, and the delivery pipeline leads to the liquid seal cavity 82, and liquid 83 can be injected into the liquid seal cavity 82. In this way, there can be liquid 83 in the liquid seal cavity 82. There is also a liquid receiving groove 85 on the air cushion wall 1 below the liquid seal cavity 82. The recovery pump of the pump-equipped water tank 81 is connected to a recovery pipeline, and the recovery pipeline leads to the liquid receiving groove 85, and the liquid 83 in the liquid receiving groove 85 can be recovered. When the equipment stops rotating, the liquid 83 is in the pump-equipped water tank 81.

[0046] When the lifting disc 3 starts to rotate, the pump-equipped water tank 81 pumps the liquid 83 inside into the liquid seal cavity 82; The liquid 83 rotates with the lifting disc 3, generating centrifugal force, which seals the gas leaked from the inner rotating seal device 2 and reduces the gas leakage amount in the air cushion.

[0047] In this embodiment, the air-blocking brush 502 further increases the difficulty of gas passing through. Due to the U-shaped cavity structure, a part of the liquid 83 will be retained at the upper and lower parts of the edge of the liquid contact plate 307 because the centrifugal forces cancel each other out. This setting ensures that there is still liquid 83 between the air-blocking brush 502 and the air cushion wall 1 even if the supply of the pump tank 81 is interrupted, and the situation of overheating due to dry friction between the air-blocking brush 502 and the air cushion wall 1 will not occur.

[0048] The advantage of this solution is that the liquid 83 sealing device can be used in a flywheel energy storage device with a variable-speed rotor 14.

[0049] Embodiment 3: On the basis of Embodiment 1, the difference is that a sealing chassis 21 is provided above the upper frame 15. The sealing chassis 21 is an airtight circular disc, so that various unsealed upper frame 15 structures commonly used in water turbine generators can be adopted for the upper frame 15. An electric machine frame 11 is also provided on the upper frame 15, and the motor / generator 4 is arranged above the electric machine frame 11. A base 19 is also provided at the bottom of the machine pit, and a guide bearing 18 is also arranged between the middle of the base 19 and the rotor shaft 7. A brake 17 is also provided on the base 19. The function of the brake 17 is the same as the principle function of the brake 17 in a water turbine generator.

[0050] The air cushion wall 1 is composed of an outer ring 102, support spokes 103, a central ring 105, an inner air cushion wall 107 and an outer air cushion wall 108. The inner air cushion wall 107 and the outer air cushion wall 108 are separated. The outer ring 102 is connected to the central ring 105 through the support spokes 103. A radial bearing 6 and an axial bearing 23 are arranged between the central ring 105 and the lift disc 3. A spring 25 is also provided at the lower part of the outer ring 102, and the inner air cushion wall 107 is installed at the upper part of the outer ring 102, so that the inner air cushion wall 107 can vibrate with the lift disc 3 but does not rotate. The lift disc 3 is formed by a disc 306 and a liquid contact plate 307, and the liquid contact plate 307 is fixed on the outer side of the upper part of the disc 306.

[0051] The side surface of the inner air cushion wall 107, the upper surface of the sealing chassis 21 and the bottom surface of the lift disc 3 form an air cushion chamber 20. An inner layer rotary sealing device 2 is arranged between the side surface of the inner air cushion wall 107 and the lift disc 3. Here, the inner layer rotary sealing device 2 is a labyrinth sealing 86 device. The outer air cushion wall 108 is located outside the liquid contact plate 307.

[0052] The liquid sealing cavity 82 is located between the upper surface outside the liquid contact plate 307 and the outer air cushion wall 108. There is a horizontally arranged U-shaped cavity structure between the outer air cushion wall 108 and the liquid contact plate 307. The lower surface of the upper wall of the liquid sealing cavity 82 is smooth. A gas blocking brush 502 and a gas blocking brush baffle 503 are provided below the liquid contact plate 307. The gas blocking brush baffle 503 is provided on the side of the gas blocking brush 502, and the gas blocking brush 502 and the gas blocking brush baffle 503 are distributed at intervals. The gas blocking brush baffle 503 can be an annular plate or the sealing teeth of the labyrinth seal 86. In this way, the gas blocking brush 502 can drive the liquid 83 to rotate and increase the difficulty of gas passing through, which is beneficial to improving the sealing performance. Refer Figure 11 The gas blocking brush 502 is inclined. When the gap between the air cushion wall 1 and the lifting disc 3 becomes smaller due to vibration during the rotation of the lifting disc 3, the pressure of the gas blocking brush 502 on the air cushion wall 1 can be reduced. A liquid receiving groove 85 is also provided inside the outer air cushion wall 108. There is a water tank 81 with a pump on the upper frame 15. The delivery pump of the water tank 81 with a pump is connected to a delivery pipeline, and the delivery pipeline leads to the liquid sealing cavity 82, and liquid 83 can be injected into the liquid sealing cavity 82. In this way, there can be liquid 83 in the liquid sealing cavity 82. A liquid receiving groove 85 is also provided on the air cushion wall 1 below the liquid sealing cavity 82. The recovery pump of the water tank 81 with a pump is connected to a recovery pipeline, and the recovery pipeline leads to the liquid receiving groove 85, and the liquid 83 in the liquid receiving groove 85 can be recovered. When the device stops rotating, the liquid 83 is in the water tank 81 with a pump.

[0053] The working principle of this embodiment is the same as that of Embodiment 2.

[0054] The advantage of this solution is that with the design of two separate inner and outer air cushion walls 1, the diameter of the liquid sealing cavity 82 is increased. Increasing the diameter can increase the centrifugal force, and it can be used in devices with a relatively low rotational speed of the rotor 14.

[0055] Embodiment 4: This embodiment is improved on the basis of Embodiment 3. The difference from Embodiment 3 is

[0056] A small thrust bearing 26 is provided between the upper part of the thrust head 10 and the motor frame 11. In this way, when the air cushion thrust is greater than the weight of the rotor 14 etc., the upward movement of the rotor 14 can be prevented, making it safer.

[0057] The inner layer rotary sealing device 2 is a honeycomb seal 88.

[0058] The lifting disc 3 is composed of a disc 306, a liquid contact plate 307, and a central body 305. The central body 305 is fixed inside the disc 306. The hole at the lower part of the central body 305 of the lifting disc 3 is larger than the rotor shaft 7, and there is a flexible sealing gasket 16 between the lifting disc 3 in the hole and the rotor shaft 7.

[0059] The air cushion wall 1 is formed by a sealing wall 101, an outer ring 102, support spokes 103 and a central ring 105. The structural principles of the outer ring 102, support spokes 103 and central ring 105 are the same as those in Embodiment 3. The upper and lower sides of the sealing wall 101 are connected to the lift plate 3 by the central ring 105, support spokes 103, outer ring 102. Among them, the upper and lower central rings 105 are both connected to the central body 305 through radial bearings 6, and the upper and lower central rings 105 are both connected to the disc 306 through axial bearings 23. A spring 25 is also provided at the lower part of the outer ring 102.

[0060] In this way, the force-bearing structure of the sealing wall 101 is better, and it can better synchronize with the lift plate 3.

[0061] There is a cavity with a horizontally placed U-shaped structure on the outer side of the upper side of the sealing wall 101. The liquid contact plate 307 is inside the U-shaped cavity. The liquid contact plate 307 is thinner on the outside and thicker on the inside. When not rotating, the liquid can flow to the lower part. The U-shaped cavity on the sealing wall 101 and the cavity formed in cooperation with the liquid contact plate 307 form a liquid sealing cavity 82. A groove is provided at the lower wall part of the U-shaped cavity, and the groove forms a liquid storage pool 80. Here, the liquid supply device 8 is the liquid storage pool 80. A gas blocking packing 500 is provided at the lower outer side of the liquid contact plate 307, and blades 501 are provided on the lower surface of the liquid contact plate 307. A liquid cooling groove 506 is also provided at the lower part of the gas blocking packing 500 and at the top of the air cushion wall 1, and the liquid sealing cavity 82 is cooled by a liquid cooling device.

[0062] A sealing chassis 21 is also provided at the lower part of the upper frame 15 to seal the lower part of the upper frame 15. A rotor plate 141 is also fixed between the outer side of the lower part of the sealing chassis 21 at the lower part of the upper frame 15 and the outer side of the upper part of the rotor 14. A lower air cushion wall 109 is fixed on the upper frame 15. A liquid sealing cavity 82 is provided between the lower air cushion wall 109 and the rotor plate 141 to seal the lower part of the air cushion chamber 20. The structure of the liquid sealing cavity 82 at the lower part of the upper frame 15 is the same as that of the liquid sealing cavity 82 at the upper part of the upper frame 15. A liquid storage pool 80 is also provided at the lower part of the lower air cushion wall 109. A gas blocking packing 500 and blades 501 are fixed at the lower part of the rotor plate 141. A liquid sealing cavity 82 is provided between the lower air cushion wall 109 and the rotor plate 141. There is a liquid 83 for sealing in the liquid sealing cavity 82. Since there is no labyrinth seal 86 inside the gas blocking packing 500, the sealing effect is increased only by increasing the diameter of the liquid seal.

[0063] When not rotating, the liquid 83 is in the liquid storage pool 80.

[0064] When the lift plate 3 starts to rotate, the liquid 83 in the liquid storage pool 80 enters the liquid sealing cavity 82 above the liquid contact plate 307. The gas blocking packing 500 increases the difficulty of gas passing through, and plays a sealing role for the gas leaked from the inner rotating sealing device 2. The U-shaped cavity structure ensures that there is always liquid 83 between the gas blocking packing 500 and the air cushion wall 1.

[0065] The advantage of this embodiment is that the lower rotary seal device 9 can also be assisted by liquid seal for sealing.

[0066] The lift plate 3 in this embodiment can use various lift plate 3 structures in the patents applied by our company. For example, the disc 306 in Embodiment 2 can be replaced with the structure of the force-bearing plate, stiffeners, and upper layer plate in the patent of an air-cushion supported rotor device with a radial bearing above the air-cushion chamber, patent number: 202421788504.X.

[0067] A heat dissipation device can also be provided on the air-cushion wall 1 of the inner rotary seal device 2 in the present invention.

[0068] If the air-cushion pressure is low in the present invention, a series of multi-layer liquid seals can also be provided, and only rely on the liquid seal for sealing after rotation.

[0069] In the present invention, according to needs, a pressure relief valve or a bypass channel exhaust hole, etc. can be provided on the air-cushion wall 1 between the liquid seal, the inner rotary seal device 2, and the lower rotary seal device 9 to actively control the pressure difference within a safe range.

[0070] On one side of the air-cushion wall 1 in the liquid seal cavity 82 of the present invention, a hydrophobic material can also be sprayed or pasted to reduce friction. Such as polytetrafluoroethylene used as a ship drag reduction coating, such as superhydrophobic nano-coatings, etc.

[0071] The liquid 83 in the present invention can be inexpensive water, antifreeze that is not afraid of low temperature, liquid in magnetorheological seals that can increase density, etc.

[0072] The functional components in the embodiments of the present invention can also be interchanged. For example, the air-blocking brush 502 in Embodiment 2 can also be replaced with an air-blocking packing 500. When replaced with an air-blocking packing 500, the liquid 83 supplied by the pump water tank 81 can play a cooling role.

[0073] The guide bearing 18 in the present invention can also be replaced with a radial electromagnetic bearing. The thrust bearing 5 can also be replaced with an axial electromagnetic bearing. Or a mechanical thrust bearing and an axial electromagnetic bearing can be used in combination.

[0074] The inner rotary seal device 2 and the lower rotary seal device 9 in the present invention can select various rotary seal devices, or can also be a combination of multiple seal devices, such as a combination of labyrinth seal and magnetorheological seal.

[0075] The components in the present invention can be manufactured separately or processed as a whole piece. The components in the present invention can also be divided into multiple components for convenient processing. In particular, the air-cushion wall 1 is drawn as a whole in the figure, which is simpler, but in actual manufacturing, it is easier to install after being divided into multiple components.

[0076] The above are only the preferred embodiments of the present invention, and various solutions can be used in combination.

[0077] The devices outside the air cushion device of the present invention can be replaced with alternative devices. For example, an axial electromagnetic bearing can be used to replace the thrust bearing 5, and a radial electromagnetic bearing can be used to replace the guide bearing 18, and so on.

[0078] The above are only the preferred embodiments of the present invention.

Claims

1. A device for supporting a rotor with a liquid-assisted sealed air cushion, comprising a rotor (14), a rotor shaft (7), an air compressor (22), an air cushion wall (1), and a cushioning plate (3) located inside the air cushion wall (1), a sealing bottom plate (21) being arranged at the bottom of the air cushion wall (1), a rotating sealing device being arranged between the cushioning plate (3) and the air cushion wall (1), the air cushion wall (1), the cushioning plate (3) and the sealing bottom plate (21) forming an air cushion chamber (20), the air compressor (22) supplying air to the air cushion chamber (20), the cushioning plate (3) being connected to the rotor (14) via the rotor shaft (7), characterized in that: The rotary sealing device comprises an inner rotary sealing device (2) and an outer liquid sealing device. The liquid sealing device is a liquid sealing chamber (82) arranged between the top of the lifting plate (3) and the air cushion wall (1). The liquid sealing chamber (82) is connected to a liquid supply device (8). When the lifting plate (3) rotates, the liquid supply device (8) supplies liquid (83) to the liquid sealing chamber (82). The surface of the air cushion wall (1) in the liquid sealing chamber (82) is smoother than the surface of the lifting plate (3). The lifting plate (3) drives the liquid (83) to rotate. The liquid (83) in the liquid sealing chamber (82) is pressed against the air cushion chamber. The gas in the lifting plate (20) is sealed, the liquid supply device (8) is a liquid storage tank (80), the liquid sealing chamber (82) is a horizontally placed U-shaped chamber structure formed between the outer side of the top of the lifting plate (3) and the air cushion wall (1), the air cushion wall (1) is composed of a separate inner air cushion wall (107) and an outer air cushion wall (108), the outer air cushion wall (108) is on the outer side of the inner air cushion wall (107), an inner layer rotating sealing device (2) is arranged between the inner air cushion wall (107) and the lifting plate (3), and the liquid sealing chamber (82) is arranged between the outer air cushion wall (108) and the lifting plate (3).

2. The device for supporting a rotor with a liquid-assisted sealing air cushion according to claim 1, characterized in that: A gas-blocking filler (500) is provided in the liquid sealing cavity (82).

3. The device for supporting a rotor with a liquid-assisted sealing air cushion according to claim 1, characterized in that: An air-blocking brush (502) is provided in the liquid sealing chamber (82).

4. The device for supporting a rotor with a liquid-assisted sealing air cushion according to claim 1, characterized in that: The liquid sealing chamber (82) has a higher outer side than an inner side in the radial direction.

5. The device for supporting a rotor with a liquid-assisted sealing air cushion according to claim 1, characterized in that: A heat sink (505) is also installed on the upper part of the air cushion wall (1).

6. A device for supporting a rotor with a liquid-assisted sealing air cushion according to any one of claims 1 to 5, characterized in that: The liquid supply device (8) is a water tank (81) with a pump.

7. The device for supporting a rotor with a liquid-assisted sealing air cushion according to claim 1, characterized in that: The liquid storage tank (80) is located at the lower part of the liquid sealing cavity (82) of the U-shaped cavity structure, and a blade (501) fixed on the lifting plate (3) is provided in the liquid storage tank (80).

8. The device for supporting a rotor with a liquid-assisted sealing air cushion according to claim 6, characterized in that: The water tank with pump (81) is connected to a delivery pipeline, the outlet of the delivery pipeline is in communication with the liquid sealing chamber (82), the water tank with pump (81) is used to inject liquid (83) into the liquid sealing chamber (82), a liquid receiving groove (85) is provided on the air cushion wall (1) below the liquid sealing chamber (82), the liquid receiving groove (85) is connected to the water tank with pump (81) via a recovery pipeline, and the liquid (83) in the liquid receiving groove (85) can be pumped back to the water tank with pump (81).

Images