Compressor gearbox and centrifugal compressor

Abstract

The utility model provides a compressor gear box, which belongs to the technical field of compressors and comprises a box body, sealing discs are fixedly mounted at two ends of the box body, mounting holes are formed in the sealing discs, two ends of a rotating shaft are arranged in the mounting holes, oil return cavities are formed in the inner walls of the mounting holes, the rotating shaft is provided with a first oil retainer, and the first oil retainer extends into the oil return cavities. The sealing disc is provided with an oil return channel communicated with the oil return cavity and the inner cavity of the gear box; the inner wall of the mounting hole is further provided with a first annular air chamber, the first annular air chamber is located on the outer side of the oil return cavity, the sealing disc is provided with a gas channel communicating the first annular air chamber with the outside of the gearbox, the gas channel is suitable for introducing isolation gas into the first annular air chamber, and leakage of oil mist in the gearbox is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressors, and in particular relates to a compressor gear box and a centrifugal compressor. Background Art

[0002] A centrifugal compressor is a rotary machine. Under the action of a high-speed rotating impeller, the medium gas obtains velocity energy and pressure energy. Through the action of the diffuser, the velocity energy is further converted into pressure energy, which helps to increase the gas pressure.

[0003] Since the shaft needs to rotate at high speed, a gap needs to be left for the shaft. During the operation of the centrifugal compressor, the oil mist generated in the gearbox will flow out of the gearbox through the shaft gap. Since the impeller is connected to the end of the shaft, in severe cases, the outflowing oil mist gas will enter the impeller and pollute the compressed air.

[0004] In the prior art, oil seals are generally used to prevent oil and gas leakage. The oil seals block the oil and gas in the gear box by setting multiple grate teeth. However, this method can prevent most oil and gas leakage, but cannot completely prevent it. Utility Model Content

[0005] In order to solve the above-mentioned oil mist leakage problem, the utility model provides a compressor gearbox, including a box body, sealing disks are fixedly installed on both sides of the box body, the sealing disks are provided with mounting holes, both ends of the rotating shaft are arranged in the mounting holes, the inner wall of the mounting hole is provided with an oil return cavity, the rotating shaft is provided with a first oil baffle ring, the first oil baffle ring extends into the oil return cavity, and the sealing disk is provided with an oil return channel connecting the oil return cavity and the inner cavity of the gearbox;

[0006] The inner wall of the mounting hole is also provided with a first annular air chamber, which is located outside the oil return cavity. The sealing disk is provided with a gas channel connecting the first annular air chamber with the outside of the gearbox, and the gas channel is suitable for introducing isolation gas into the first annular air chamber.

[0007] In an optional implementation manner, the rotating shaft is further provided with a second oil deflector ring, the inner side surface of the sealing disk is provided with a accommodating cavity, and the second oil deflector ring is located in the accommodating cavity.

[0008] In an optional embodiment, a second annular air chamber is provided on the outer periphery of the sealing disk, a plurality of the gas channels are arranged along the circumferential direction, the gas channels extend along the radial direction, and the two ends of the gas channels are respectively connected to the first annular air chamber and the second annular air chamber;

[0009] The housing is further provided with an air intake passage, which is connected to the second annular air chamber and the outside of the gear box.

[0010] In an optional implementation manner, at least one oil return hole is further provided on the inner wall of the mounting hole, and one end of the oil return hole away from the mounting hole is connected to the oil return channel.

[0011] In an optional implementation manner, a plurality of the oil return holes are provided, at least one oil return hole is provided on the outside of the oil return cavity, and at least one oil return hole is provided on the inside of the oil return cavity.

[0012] In an optional implementation, a support seat is provided in the inner cavity of the gear box, suitable for supporting the rotating shaft, and a gap is provided between the rotating shaft and the mounting hole.

[0013] In an optional implementation manner, the sealing disk is a two-half structure, and the two halves are matched to form the mounting hole.

[0014] In an optional implementation, an air intake pipe is disposed outside the gear box, one end of the air intake pipe is connected to the air intake passage, and the other end of the air intake pipe is connected to an air source.

[0015] In an optional implementation, the gearbox is provided with a plurality of the rotating shafts.

[0016] The utility model also provides a centrifugal compressor, comprising the compressor gear box as described above.

[0017] Compared with the prior art, the technical solution provided by the utility model has the following advantages:

[0018] An oil return cavity and a first annular air chamber are arranged on the inner wall of the mounting hole, and a first oil baffle ring is arranged on the rotating shaft. The oil mist inside the gear box moves along the B3 direction, leaks to the first oil baffle ring through the gap between the rotating shaft and the sealing disk, and is blocked by the first oil baffle ring. The first oil baffle ring rotates at a high speed, and the oil mist is thrown to the inner wall of the oil return cavity under the action of centrifugal force, and returns to the inner cavity of the gear box through the oil return channel; a first annular air chamber is also arranged on one side of the oil return cavity, and isolation gas is introduced into the first annular air chamber. Part of the isolation gas moves along the B1 direction, and part of the isolation gas moves along the B2 direction and flows into the gear box. The oil mist flowing out of the gear box along the B3 direction is blocked, thereby further preventing the leakage of the lubricating oil in the gear box. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1This is a schematic diagram of the overall structure of the compressor gearbox of the utility model;

[0021] Figure 2 This is a schematic diagram of the partial structure of the compressor gearbox of the utility model;

[0022] Description of reference numerals:

[0023] 1-box body, 1.1-first box body, 1.2-second box body, 2-sealing plate, 3-rotating shaft, 4-oil return cavity, 5-first oil baffle ring, 6-oil return channel, 7-first annular air chamber, 8-gas channel, 9-second oil baffle ring, 10-accommodating cavity, 11-second annular air chamber, 12-intake channel, 13-oil return hole, 14-intake pipe, 15-filter valve, 16-box cover. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Please refer to Figure 1-Figure 2 The utility model provides a compressor gearbox, including a box body 1, a box cover 16, a rotating shaft 3, a sealing disk 2, etc.

[0030] Specifically, the housing 1 has a cavity, and the housing cover 16 is arranged on the housing 1. Mounting grooves are arranged on both sides of the housing 1, and a sealing disk 2 is fixedly installed in the mounting grooves. The sealing disk 2 is provided with a mounting hole, and both ends of the rotating shaft 3 are arranged in the mounting holes. An oil return cavity 4 is provided on the inner wall of the mounting hole, and the rotating shaft 3 is provided with a first oil deflector ring 5, which extends into the oil return cavity 4, and the sealing disk 2 is provided with an oil return channel 6 connecting the oil return cavity 4 and the inner cavity of the gear box. The oil return cavity 4 has a preset depth and extends in the circumferential direction, and the oil return channel 6 is provided on the inner side of the sealing disk 2. A first annular air chamber 7 is also provided on the inner wall of the mounting hole, and the first annular air chamber 7 is located on the outer side of the oil return cavity 4. The sealing disk 2 is provided with a gas channel 8 connecting the first annular air chamber 7 and the outside of the gear box, and the gas channel 8 is suitable for introducing isolation gas into the first annular air chamber 7.

[0031] The utility model sets an oil return cavity 4 and a first annular air chamber 7 on the inner wall of the mounting hole, and a first oil retaining ring 5 is set on the rotating shaft 3. The oil mist inside the gearbox leaks to the first oil retaining ring 5 along the B3 direction through the gap between the rotating shaft 3 and the sealing disk 2, and is blocked by the first oil retaining ring 5. The first oil retaining ring 5 rotates at a high speed, and the oil mist is thrown to the inner wall of the oil return cavity 4 under the action of centrifugal force, and returns to the inner cavity of the gearbox through the oil return channel 6. Further, a first annular air chamber 7 is set on one side of the oil return cavity 4, and an isolation gas is introduced into the first annular air chamber 7. A part of the isolation gas moves along the B1 direction, and a part of the isolation gas moves along the B2 direction and flows into the gearbox. The oil mist flowing out of the gearbox along the B3 direction is blocked, which further prevents the leakage of the lubricating oil in the gearbox.

[0032] Furthermore, the rotating shaft 3 is also provided with a second oil slinger ring 9, and the inner side of the sealing disc 2 is provided with an accommodating cavity 10, and the second oil slinger ring 9 is located in the accommodating cavity 10. The second oil slinger ring 9 has the same function as the first oil slinger ring 5, and is used to block the oil mist and throw the oil mist to the inner wall of the accommodating cavity 10, and then flow back to the inner cavity of the gear box.

[0033] Preferably, a second annular air chamber 11 is provided on the outer periphery of the sealing disk 2, and a plurality of gas channels 8 are arranged in the circumferential direction, and the gas channels 8 extend in the radial direction, and the two ends are respectively connected to the first annular air chamber 7 and the second annular air chamber 11; the housing 1 is also provided with an air inlet channel 12, and the air inlet channel 12 is connected to the second annular air chamber 11 and the outside of the gearbox. The external air source first enters the second annular air chamber 11 through the air inlet channel 12, and then enters the first annular air chamber 7 through the plurality of gas channels 8, which ensures the uniformity of the gas isolated on the outer periphery of the rotating shaft 3 and further enhances the anti-leakage effect. The number of gas channels 8 can be 4-8.

[0034] Furthermore, at least one oil return hole 13 is provided on the inner wall of the mounting hole, and one end of the oil return hole 13 away from the mounting hole is connected to the oil return channel 6, which is suitable for guiding the lubricating oil on the inner wall of the sealing disk 2 back to the inner cavity of the gear box. Preferably, a plurality of oil return holes 13 are provided, at least one oil return hole 13 is provided on the outer side of the oil return cavity 4, and at least one oil return hole 13 is provided on the inner side of the oil return cavity 4, so as to improve the anti-leakage effect.

[0035] In an optional embodiment, a support seat is provided in the inner cavity of the gear box, suitable for supporting the rotating shaft 3, a bearing is provided between the rotating shaft 3 and the support seat, and the rotating shaft 3 is supported on the support seat so that a preset gap is formed between the rotating shaft 3 and the mounting hole.

[0036] In an optional implementation manner, the sealing disk 2 is a two-half structure, and the two-half structures are matched to form a mounting hole. The sealing disk 2 of the two-half structure is convenient for the installation of the rotating shaft 3.

[0037] Furthermore, an air intake pipe 14 is disposed outside the gear box, one end of the air intake pipe 14 is connected to the air intake channel 12 , and the other end is connected to the air source. A filter valve 15 is disposed on the air intake pipe 14 .

[0038] In an optional embodiment, the gearbox is provided with a plurality of rotating shafts 3, the air intake pipe 14 includes an air intake manifold and an air intake branch pipe, each air intake channel 12 is connected to a corresponding air intake branch pipe, and the plurality of air intake branch pipes are connected to the air intake manifold. Figure 1 As shown, the gearbox is provided with three rotating shafts 3, the housing 1 comprises a first housing 1.1 and a second housing 1.2 which are stacked, two rotating shafts 3 are arranged between the first housing 1.1 and the second housing 1.2, and one rotating shaft 3 is arranged between the second housing 1.2 and the housing cover 16, which is more convenient for installing the rotating shaft 3.

[0039] The utility model also provides a centrifugal compressor, comprising the above compressor gear box.

[0040] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A compressor gearbox, comprising a box body (1), sealing disks (2) are fixedly mounted on both sides of the box body (1), the sealing disks (2) are provided with mounting holes, and both ends of a rotating shaft (3) are arranged in the mounting holes, characterized in that: An oil return cavity (4) is formed on the inner wall of the mounting hole, a first oil deflector ring (5) is provided on the rotating shaft (3), the first oil deflector ring (5) extends into the oil return cavity (4), and the sealing plate (2) is provided with an oil return channel (6) connecting the oil return cavity (4) and the inner cavity of the gear box; The inner wall of the mounting hole is also provided with a first annular air chamber (7), the first annular air chamber (7) is located outside the oil return cavity (4), the sealing disk (2) is provided with a gas channel (8) connecting the first annular air chamber (7) with the outside of the gear box, and the gas channel (8) is suitable for introducing isolation gas into the first annular air chamber (7).

2. A compressor gearbox according to claim 1, characterized in that: The rotating shaft (3) is also provided with a second oil deflector ring (9), and the inner side surface of the sealing disk (2) is provided with an accommodating cavity (10), and the second oil deflector ring (9) is located in the accommodating cavity (10).

3. A compressor gearbox according to claim 1, characterized in that: A second annular air chamber (11) is arranged on the outer periphery of the sealing disk (2), a plurality of gas channels (8) are arranged in the circumferential direction, the gas channels (8) extend in the radial direction, and the two ends of the gas channels are respectively connected to the first annular air chamber (7) and the second annular air chamber (11); The housing (1) is also provided with an air intake passage (12), and the air intake passage (12) is connected to the second annular air chamber (11) and the outside of the gear box.

4. A compressor gearbox according to claim 1, characterized in that: The inner wall of the mounting hole is also provided with at least one oil return hole (13), and one end of the oil return hole (13) away from the mounting hole is connected to the oil return channel (6).

5. A compressor gearbox according to claim 4, characterized in that: A plurality of the oil return holes (13) are provided, at least one oil return hole (13) is provided on the outside of the oil return cavity (4), and at least one oil return hole (13) is provided on the inside of the oil return cavity (4).

6. A compressor gearbox according to claim 1, characterized in that: A support seat is arranged in the inner cavity of the gear box, which is suitable for supporting the rotating shaft (3), and a gap is arranged between the rotating shaft (3) and the mounting hole.

7. A compressor gearbox according to claim 1, characterized in that: The sealing disk (2) is a two-half structure, and the two halves are matched to form the mounting hole.

8. A compressor gearbox according to claim 3, characterized in that: An air intake pipe (14) is arranged outside the gear box, one end of the air intake pipe (14) is connected to the air intake passage (12), and the other end of the air intake pipe (14) is connected to an air source.

9. A compressor gearbox according to claim 1, characterized in that: The gear box is provided with a plurality of rotating shafts (3).

10. A centrifugal compressor, characterized in that: Comprising a compressor gearbox as described in any one of claims 1-9.

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