Sealing structure of high-speed rotor impeller end

Abstract

The utility model relates to a sealing structure of a high-speed rotor impeller end. The gear box comprises a gear box body which is provided with a main oil return hole; the rotor assembly comprises a rotating shaft and an impeller which are connected, the rotating shaft is provided with an oil slinger and an extension section extending to the oil slinger in the axial direction, and the extension section comprises a first diameter section and a second diameter section; the second diameter section is sleeved with the positioning ring, the positioning ring is connected with the end of the first diameter section, and the outer diameter end of the positioning ring is provided with a step structure distributed in the axial direction; an inner hole of the oil sealing ring extends in the radial direction to form a plurality of first sealing rings which are distributed at intervals in the axial direction and form a clearance sealing pair with the first diameter section, a first pressure relief cavity is formed between the first sealing rings and the first diameter section, and the first pressure relief cavity is communicated with the main oil return hole; a plurality of second sealing rings which are distributed in a step mode in the axial direction extend in the radial direction of an inner hole of the air sealing ring, and a gap sealing pair is formed by the second sealing rings and the step structure. The sealing performance of the impeller end of the rotor can be greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan rotor technical field especially is a kind of sealing structure of high-speed rotor impeller end. BACKGROUND

[0002] In prior art, in the single-stage high-speed centrifugal fan of gear speed-up, the gas seal and oil seal of high-speed rotor impeller end usually use sawtooth-shaped labyrinth structure distributed along the axial direction, due to the limited axial space, the sealing effect always cannot reach the expected goal (especially in high-pressure fan);In addition, affected by high-speed shaft structure, gas seal ring and oil seal ring can only be made into split structure, and the sealing glue on split surface can increase the sealing gap between sawtooth ring and high-speed shaft, thereby causing adverse effects on sealing property. SUMMARY

[0003] Therefore, the utility model provides a kind of sealing structure of high-speed rotor impeller end, which can greatly improve the sealing property of rotor impeller end.

[0004] To solve the above technical problems, the utility model provides a kind of sealing structure of high-speed rotor impeller end, comprising:

[0005] Gear box body, provided with total oil return hole;

[0006] Rotor assembly, comprising connected shaft and impeller, the shaft is supported by bearing arranged on the gear box body, the shaft is provided with oil throw ring and extension section extending in the axial direction of the oil throw ring, the extension section includes first diameter section and second diameter section with different diameters;

[0007] Positioning ring, the second diameter section is sleeved on the outer diameter section and connected with the first diameter section end, the outer diameter end of the positioning ring is provided with axial distribution step structure;

[0008] Oil seal ring, the oil return cavity communicated with the total oil return hole is formed between the oil seal ring and the bearing, the inner hole of the oil seal ring extends in the radial direction There are a plurality of first sealing rings spaced apart in the axial direction, and the first diameter section forms a gap sealing pair, a plurality of first sealing rings and the first diameter section form a first pressure relief cavity, and the first pressure relief cavity is communicated with the total oil return hole;

[0009] Gas seal ring, the cavity communicated with atmosphere is formed between the oil seal ring and the gas seal ring, the inner hole of the gas seal ring extends in the radial direction There are a plurality of second sealing rings spaced apart in the axial direction, and the step structure forms a gap sealing pair, a plurality of second sealing rings and the step structure form a second pressure relief cavity.

[0010] In an embodiment of the utility model, adjacent two first sealing rings and the first diameter section form a first pressure relief cavity respectively, and a plurality of oil return holes are arranged on the oil seal ring in radial direction and are communicated with the first pressure relief cavities respectively.

[0011] In an embodiment of the utility model, adjacent two second sealing rings and the step structure form a second pressure relief cavity respectively.

[0012] In an embodiment of the utility model, the radial dimension of the positioning ring gradually increases along the direction away from the oil seal ring.

[0013] In an embodiment of the utility model, the first sealing ring and the first diameter section form a labyrinth oil seal structure, and the second sealing ring and the positioning ring form a labyrinth air seal structure.

[0014] In an embodiment of the utility model, the oil throw ring and the oil seal ring form an oil throw gap.

[0015] In an embodiment of the utility model, the positioning ring and the end of the first diameter section are provided with an anti-rotation pin.

[0016] In an embodiment of the utility model, the end of the first sealing ring and the end of the second sealing ring are both sawtooth-shaped.

[0017] In an embodiment of the utility model, a screw rod is further arranged, a screw hole is arranged on the axial center of the extension section, one end of the screw rod passes through the center hole of the impeller and is threadedly connected with the screw hole, and the other end of the screw rod is connected with a fastening component.

[0018] Compared with the prior art, the above technical scheme of the utility model has the following advantages:

[0019] The sealing structure of the high-speed rotor impeller end can shorten the axial length of the air seal and increase the oil seal length correspondingly, thereby improving the oil seal reliability.

[0020] The positioning ring connecting the high-speed rotating shaft end and the impeller is designed as a split structure, so that the oil seal ring and the air seal ring can be made into an integral structure, which is not only convenient for processing and installation, but also can strictly control the sealing gap between the first sealing ring of the oil seal ring and the second sawtooth ring of the air seal ring and the rotating shaft, thereby improving the sealing performance.

[0021] The utility model discloses a strong applicability can be applicable to all similar products. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the content of the utility model more easily be clearly understood, below according to the specific embodiment of the utility model and combining with the drawings, the utility model is further detailed.

[0023] Figure 1 It is the structural diagram of the sealing structure of the high-speed rotor impeller end of the utility model.

[0024] Explanation of the reference signs of the drawings:

[0025] 1, rotating shaft;11, oil throwing ring;12a, first diameter section;12b, second diameter section;

[0026] 2, gear box body;21, gear box inner cavity;22, total oil return hole;

[0027] 3, bearing;

[0028] 4, oil seal ring;41, first sealing ring;42, first pressure relief cavity;43, partial oil return hole;44, oil return cavity;45, cavity;

[0029] 5, gas seal ring;52, second pressure relief cavity;53, second sealing ring;

[0030] 6, positioning ring;61, step structure;

[0031] 7, impeller;75, impeller back cavity;

[0032] 8, fastening component;

[0033] 9, anti-rotation pin. DETAILED DESCRIPTION

[0034] The utility model is further explained below combining with the drawings and specific embodiment, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0035] In the utility model, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical scheme of the utility model, and is not instructing or suggesting that the indicated technical feature must have a particular orientation, structure and operation, so it can not be understood as the limitation of the utility model.

[0036] In the utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "exceed" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number. In the description of the utility model, if "first" and "second" are described, they are only used for distinguishing technical features for the purpose, and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0037] In the utility model, unless otherwise explicitly limited, the words such as "arrangement", "installation", "connection" should be understood in a broad sense, for example, can be directly connected, can also be indirectly connected through an intermediate medium; can be fixedly connected, can also be detachably connected, can also be integrally formed; can be mechanically connected, can also be electrically connected or capable of intercommunication; can be the communication or interaction relationship of two elements inside two elements. The person skilled in the art can reasonably determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0038] Referring to Figure 1 The utility model discloses a sealing structure of high -speed rotor impeller end, including:

[0039] Gear box 2 is provided with total oil return hole 22;

[0040] Rotor assembly, including the connecting shaft 1 and impeller 7, the shaft 1 is supported by the bearing 3 arranged on the gear box 2, the shaft 1 is provided with oil slinger 11 and the extension section extending in the axial direction of oil slinger 11, the extension section includes the first diameter section 12a and the second diameter section 12b of different diameters;

[0041] Positioning ring 6 is sleeved on the second diameter section 12b and is connected with the first diameter section 12a end, and the outer diameter end of the positioning ring 6 is provided with the step structure 61 distributed in the axial direction;

[0042] Oil seal ring 4 forms the oil return cavity 44 communicated with the total oil return hole 22 with the bearing 3, and the inner hole of the oil seal ring 4 extends in the radial direction and is provided with a plurality of first seal rings 41 spaced apart in the axial direction and forming a gap seal pair with the first diameter section 12a, a plurality of first seal rings 41 and the first diameter section 12a form a first pressure relief cavity 42, and the first pressure relief cavity 42 is communicated with the total oil return hole 22;

[0043] Airtight sealing ring 5 is fixed on gear box 2, and forms cavity 45 communicated with atmosphere between oil sealing ring 4, inner hole of airtight sealing ring 5 extends radially and has several second sealing rings 53 which are distributed in steps along axial direction and form gap sealing pair with step structure 61, and several second sealing rings 53 form second pressure relief cavity 52 with step structure 61.

[0044] In one embodiment, first pressure relief cavity 42 is formed between each of two adjacent first sealing rings 41 and first diameter section 12a, and oil return hole 43 communicated with each first pressure relief cavity 42 is opened radially on oil sealing ring 4, and each oil return hole 43 is communicated with total oil return hole 22.

[0045] In one embodiment, second pressure relief cavity 52 is formed between each of two adjacent second sealing rings 53 and step structure 61.

[0046] In one embodiment, radial dimension of positioning ring 6 gradually increases along direction away from oil sealing ring 4.

[0047] Specifically, labyrinth oil sealing structure is formed between several first sealing rings 41 and first diameter section 12a, and labyrinth airtight sealing structure is formed between several second sealing rings 53 and positioning ring 6.

[0048] It should be noted that, in original limited axial space, labyrinth airtight sealing structure of airtight sealing ring 5 is designed as stepped structure, so that sealing property of stepped structure is superior to original axial arrangement structure under the premise of constant sealing path length, thus, axial length of airtight sealing can be shortened and oil sealing length can be increased correspondingly, so as to improve oil sealing reliability.

[0049] In one embodiment, oil throwing gap is formed between oil throwing ring 11 and oil sealing ring 4; outer part of one end of oil sealing ring 4 extends to bearing 3, and inner part of other end of oil sealing ring 4 extends axially, so as to facilitate formation of oil return cavity 44 and cavity 45.

[0050] In one embodiment, anti-rotation pin 9 is arranged between positioning ring 6 and end of first diameter section 12a, and second diameter section 12b is accurately matched with inner hole of positioning ring 6 to position impeller 7.

[0051] Positioning ring 6 connected with impeller 7 at one end of high-speed rotating shaft 1 is designed as split structure, so that oil sealing ring 4 and airtight sealing ring 5 can be made as integral structure, which not only facilitates machining and installation, but also can strictly control sealing gap between first sealing ring 41 of oil sealing ring 4 and second serrated ring of airtight sealing ring 5 and rotating shaft 1, so as to improve sealing property.

[0052] In one embodiment, the end of the first sealing ring 41 and the second sealing ring 53 is sawtooth-shaped.

[0053] In one embodiment, a screw is further included, a screw hole is arranged along the axial center of the extension section, one end of the screw passes through the center hole of the impeller 7 and is threadedly connected with the screw hole, and the other end of the screw is connected with the fastening part 8.

[0054] The sealing principle of the utility model is as follows:

[0055] When the high-speed rotating shaft 1 rotates at high speed, most of the pressure oil supplied to the bearing 3 will return to the gear box inner cavity 21, and part of the oil will enter the oil return cavity 44, most of the oil will enter the total oil return hole 22, the oil throwing ring 11 can prevent more oil from entering the labyrinth oil seal structure of the oil seal ring 4, and through the "oil blocking and pressure reduction" effect of the first sealing ring 41 and the first pressure relief cavity 42, the oil pressure in the last first pressure relief cavity 42 is balanced with the atmospheric pressure, so as to prevent oil mist from leaking to the atmosphere.

[0056] The high-speed rotating shaft 1 drives the impeller 7 to rotate at high speed, and the pressure gas in the back cavity 75 of the impeller will be subjected to the "gas blocking and pressure reduction" effect of the second sealing ring 53 and the second pressure relief cavity 52 distributed in steps, so that a small amount of gas leaks into the cavity 45 and then enters the atmosphere.

[0057] Due to the adoption of the stepped labyrinth gas seal structure, when the sealing path length is the same as the axial length of the gas seal in the prior art, the axial size of the gas seal ring 5 can be reduced, and the reduced length can be increased to the axial length of the oil seal ring 4, so that the number of the first sealing ring 41 and the first pressure relief cavity 42 of the oil seal ring 4 is increased by 2-3 compared with the structure before improvement, thereby improving the reliability of the oil seal.

[0058] In addition, due to the adoption of the split structure of the high-speed shaft and the positioning ring 6, the gas seal ring 5 and the oil seal ring 4 can be made into an integral structure, solving the problem of the increase of the sealing gap caused by the split structure in the prior art, thereby affecting the sealing performance.

[0059] Finally, it should be explained that the above specific embodiments are only used to illustrate the technical scheme of the utility model and not to limit, although the utility model is described in detail with reference to the examples, those skilled in the art should understand that the technical scheme of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical scheme of the utility model, and all should be covered in the claim range of the utility model.

Claims

1. A seal structure for a high speed rotor impeller end, characterized by, The utility model relates to a gear box body (2) is provided with total oil return hole (22), rotor assembly includes the shaft (1) and impeller (7) connected, the shaft (1) is supported by bearing (3) being arranged on the gear box body (2), the shaft (1) is provided with oil slinger (11) and the extension section of oil slinger (11) extending in the axial direction, the extension section includes the first diameter section (12a) and the second diameter section (12b) of different diameters, Positioning ring (6) is set to the second diameter section (12b) outside and is connected with the first diameter section (12a) end, the outer diameter end of positioning ring (6) is provided with the step structure (61) distribution in the axial direction, Oil seal ring (4) is formed with the bearing (3) between the oil return cavity (44) communicated with total oil return hole (22), the inner hole of oil seal ring (4) extends in the radial direction and is provided with a plurality of first sealing ring (41) spaced apart in the axial direction and forms a gap sealing pair with the first diameter section (12a), a plurality of first sealing ring (41) and the first diameter section (12a) between the first pressure relief cavity (42) is communicated with total oil return hole (22), Air seal ring (5) is formed with the oil seal ring (4) between the cavity (45) communicated with atmosphere, the inner hole of air seal ring (5) extends in the radial direction and is provided with a plurality of second sealing ring (53) step distribution in the axial direction and forms a gap sealing pair with the step structure (61), a plurality of second sealing ring (53) and the step structure (61) between the second pressure relief cavity (52). Adjacent two first sealing ring (41) and the first diameter section (12a) between the first pressure relief cavity (42) is formed respectively, and the oil return hole (43) communicated with each first pressure relief cavity (42) is opened in the radial direction of oil seal ring (4), and each oil return hole (43) is communicated with total oil return hole (22). Adjacent two second sealing ring (53) and the step structure (61) between the second pressure relief cavity (52) is formed respectively.

2. A seal structure for the end of a high speed rotor impeller according to claim 1, wherein The radial dimension of positioning ring (6) gradually increases in the direction away from oil seal ring (4).

3. A seal construction for the end of a high speed rotor impeller as claimed in claim 1 wherein, A plurality of first sealing ring (41) and the first diameter section (12a) between the labyrinth oil seal structure, a plurality of second sealing ring (53) and the positioning ring (6) between the labyrinth air seal structure.

4. A seal construction for the end of a high speed rotor impeller as claimed in claim 1 wherein, The oil slinger (11) and the oil seal ring (4) between the oil slinger gap.

5. A seal construction for the end of a high speed rotor impeller as claimed in claim 1 wherein, The positioning ring (6) and the first diameter section (12a) end between the anti-rotation pin (9) is provided.

6. A seal construction for the end of a high speed rotor impeller as claimed in claim 1 wherein, The end of first sealing ring (41) and second sealing ring (53) is zigzag.

7. A seal construction for the end of a high speed rotor impeller as claimed in claim 1 wherein, Still include screw rod, be provided with screw hole along the axial center of extension section, one end of screw rod passes through the center hole of impeller (7) and is connected with the screw hole thread, the other end of screw rod is connected with fastening part (8).

8. A seal construction for the end of a high speed rotor impeller as claimed in claim 1 wherein, ​ 9. A seal construction for the end of a high speed rotor impeller as claimed in claim 1 wherein, ​

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