Cooling and recycling system for shaft end leakage gas of centrifugal compressor

Abstract

The utility model provides a cooling and recycling system for shaft end leakage gas of a centrifugal compressor, which belongs to the technical field of compressors and comprises a gas supplementing compressor, a booster compressor and a recycling pipeline. The booster compressor comprises a gear box and a gear shaft, the gear shaft is rotatably arranged in the gear box, the shaft end of the gear shaft is arranged in containing holes in the two sides of the gear box in a penetrating mode, an air outlet of the air supplementing compressor communicates with an air inlet of the booster compressor, and a gas medium compressed by the air supplementing compressor enters the booster compressor to be pressurized and compressed; one end of the recovery pipeline is communicated with the containing hole, the other end of the recovery pipeline is communicated with an air inlet of the air supply compressor, and a cooler is arranged on the recovery pipeline and can convey gas media leaked by the booster compressor back to the air supply compressor to avoid leakage and waste.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal compressors, and in particular relates to a cooling and recycling system for leakage gas at the shaft end of a centrifugal compressor. Background Art

[0002] Centrifugal compressors are widely used in various process flows to transport air, various process gases or mixed gases and increase their pressure. In centrifugal compressors, the high-speed rotating impeller exerts centrifugal force on the gas, and the gas diffusion effect in the diffusion channel increases the gas pressure. Because the gear shaft rotates at high speed, there is a certain gap at the shaft end of the centrifugal compressor. Although certain sealing measures have been taken, gas leakage cannot be completely avoided, especially for some rare gases. The leakage of compressed gas medium will also cause great waste. Utility Model Content

[0003] In order to solve the technical problem of gas medium leakage mentioned above, the utility model provides a centrifugal compressor shaft end leakage gas cooling and recycling system, including an air supply compressor, a booster compressor, and a recovery pipeline; the booster compressor includes a gear box and a gear shaft, the gear shaft is rotatably arranged in the gear box, and the shaft end of the gear shaft is inserted into the accommodating holes on both sides of the gear box, the air outlet of the air supply compressor is connected with the air inlet of the booster compressor, and the gas medium compressed by the air supply compressor enters the booster compressor for boosting and compression; one end of the recovery pipeline is connected to the accommodating hole, and the other end is connected to the air inlet of the air supply compressor, and a cooler is arranged on the recovery pipeline.

[0004] In an optional embodiment, a fixing plate is fixedly installed in the mounting holes on both sides of the gear box, the fixing plate is provided with the receiving hole, and sealing assemblies are sleeved on both ends of the gear shaft, and the sealing assemblies are sleeved in the receiving holes of the fixing plate.

[0005] In an optional embodiment, the accommodating hole is a stepped hole, and the sealing assembly includes a plurality of sealing disks and a pressure ring that are sequentially spaced apart, and the pressure ring located at the innermost side is fixedly connected to the fixed disk.

[0006] In an optional implementation, a first sealing ring is provided between the innermost pressure ring and the fixed disk.

[0007] In an optional embodiment, a first gas collecting annular groove is provided on the inner side wall of the accommodating hole of the fixed disk, a second gas collecting annular groove is provided on the outer side wall of the fixed disk and / or the inner side wall of the mounting hole of the gear box, the fixed disk is also provided with at least one first connecting channel connecting the first gas collecting annular groove and the second gas collecting annular groove, and the gear box is also provided with at least one second connecting channel connecting the second gas collecting annular groove and the recovery pipeline.

[0008] In an optional implementation, a plurality of second sealing rings are provided between the fixing plate and the mounting hole, and the second sealing rings are located on both sides of the second gas collecting ring groove.

[0009] In an optional embodiment, at least one of the pressure rings is provided with a vent hole, and two ends of the vent hole are respectively connected to the first gas collection ring groove and the inner hole of the pressure ring.

[0010] In an optional implementation, the gear box includes a box body and a box cover, and the box cover and the box body are matched to form the mounting hole.

[0011] In an optional implementation, impellers are mounted on both ends of the gear shaft.

[0012] Compared with the prior art, the technical solution provided by the utility model has the following advantages:

[0013] The air supply compressor is used in conjunction with the booster compressor. The air outlet of the air supply compressor is connected to the air inlet of the booster compressor. The gas medium compressed by the air supply compressor enters the booster compressor for boosting and compression. One end of the recovery pipeline is connected to the accommodating hole, and the other end is connected to the air inlet of the air supply compressor. A cooler is also provided on the recovery pipeline to transport the gas medium leaked from the booster compressor back to the air supply compressor to avoid leakage and waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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.

[0015] Figure 1 This is a schematic diagram of the structure of the cooling and recycling system for the leakage gas at the shaft end of a centrifugal compressor of the utility model;

[0016] Figure 2 The utility model is a partial structural schematic diagram of a cooling and recycling system for leakage gas at the shaft end of a centrifugal compressor.

[0017] Description of reference numerals:

[0018] 1-recovery pipeline, 2-gear box, 3-gear shaft, 4-cooler, 5-fixed disk, 6-sealing assembly, 6.1-sealing disk, 6.2-pressure ring, 7-first sealing ring, 8-first gas collecting ring groove, 9-second gas collecting ring groove, 10-first connecting channel, 11-second connecting channel, 12-second sealing ring, 13-vent. DETAILED DESCRIPTION

[0019] 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.

[0020] 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 a limitation on 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.

[0021] 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.

[0022] 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.

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Please refer to Figure 1 and Figure 2 The utility model provides a centrifugal compressor shaft end leakage gas cooling and recycling system, including an air supply compressor, a booster compressor, a recovery pipeline 1, etc.

[0025] The air outlet of the air supply compressor is connected to the air inlet of the booster compressor, and the gas medium compressed by the air supply compressor enters the booster compressor for boosting and compression. The booster compressor includes a gear box 2 and a gear shaft 3. The gear shaft 3 is rotatably arranged in the gear box 2, and the shaft ends of the gear shaft 3 are inserted into the receiving holes on both sides of the gear box 2. The receiving hole is connected at one end of the recovery pipeline 1, and the air inlet of the air supply compressor is connected at the other end. A cooler 4 is arranged on the recovery pipeline 1. The air supply compressor is used in conjunction with the booster compressor. The air outlet of the air supply compressor is connected to the air inlet of the booster compressor. The gas medium compressed by the air supply compressor enters the booster compressor for boosting and compression. The recovery pipeline 1 is connected to the receiving hole at one end, and the air inlet of the air supply compressor at the other end. A cooler 4 is also arranged on the recovery pipeline 1, which can transport the gas medium leaked from the booster compressor back to the air supply compressor and re-enter the process system to avoid leakage and waste.

[0026] Furthermore, a fixing plate 5 is fixedly installed in the mounting holes on both sides of the gear box 2, and the fixing plate 5 is provided with a receiving hole. Both ends of the gear shaft 3 are sleeved with a sealing assembly 6, and the sealing assembly 6 is sleeved in the receiving hole of the fixing plate 5. The sealing assembly 6 plays a sealing role for the gas medium.

[0027] Furthermore, the accommodating hole is a stepped hole, and the sealing assembly 6 includes a plurality of sealing disks 6.1 and pressure rings 6.2 that are spaced apart in sequence. The innermost pressure ring 6.2 is fixedly connected to the fixed disk 5. By spacing the sealing disks 6.1 and the pressure rings 6.2 apart, the sealing disk 6.1 can be better fixed, thereby achieving a better sealing effect.

[0028] Furthermore, a first sealing ring 7 is provided between the innermost pressure ring 6.2 and the fixed disk 5 to further improve the sealing performance of the shaft end.

[0029] Furthermore, the inner side wall of the receiving hole of the fixed disk 5 is provided with a first gas collection annular groove 8, the outer side wall of the fixed disk 5 and / or the inner side wall of the mounting hole of the gear box 2 is provided with a second gas collection annular groove 9, the fixed disk 5 is also provided with at least one first connecting channel 10 connecting the first gas collection annular groove 8 and the second gas collection annular groove 9, and the gear box 2 is also provided with at least one second connecting channel 11 connecting the second gas collection annular groove 9 and the recovery pipeline 1. The gas medium leaked from the shaft end will be collected in the first gas collection annular groove 8, then enter the second gas collection annular groove 9 through the first connecting channel 10, and finally enter the recovery pipeline 1 through the second connecting channel 11. Preferably, a plurality of first gas collection annular grooves 8 and second gas collection annular grooves 9 are provided, and the number of the first gas collection annular grooves 8 and the second gas collection annular grooves 9 is equal, and the plurality of first gas collection annular grooves 8 and second gas collection annular grooves 9 are spaced apart in the axial direction to improve the recovery rate of the gas medium.

[0030] Furthermore, a plurality of second sealing rings 12 are provided between the fixed disk 5 and the mounting hole. The second sealing rings 12 are located on both sides of the second gas collecting ring groove 9 , thereby further improving the sealing performance and ensuring that the leaked gas medium can completely enter the recovery pipeline 1 .

[0031] Furthermore, at least one of the pressure rings 6.2 is provided with a vent hole 13, and two ends of the vent hole 13 are respectively connected to the first gas collection annular groove 8 and the inner hole of the pressure ring 6.2, and the gas medium leaking from the shaft end enters the first gas collection annular groove 8 through the vent hole 13.

[0032] Furthermore, the gear box 2 includes a box body and a box cover, and the box cover and the box body form a mounting hole, and both ends of the gear shaft 3 are equipped with impellers.

[0033] 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 centrifugal compressor shaft end leakage gas cooling and recycling system, characterized in that: The invention comprises an air supply compressor, a booster compressor and a recovery pipeline (1); the booster compressor comprises a gear box (2) and a gear shaft (3); the gear shaft (3) is rotatably arranged in the gear box (2), and the shaft ends of the gear shaft (3) are inserted into the receiving holes on both sides of the gear box (2); the air outlet of the air supply compressor is connected to the air inlet of the booster compressor, and the gas medium compressed by the air supply compressor enters the booster compressor for boosting and compression; one end of the recovery pipeline (1) is connected to the receiving hole, and the other end is connected to the air inlet of the air supply compressor; a cooler (4) is arranged on the recovery pipeline (1).

2. A centrifugal compressor shaft end leakage gas cooling and recycling system according to claim 1, characterized in that: A fixing plate (5) is fixedly mounted on both sides of the gear box (2), the fixing plate (5) is provided with the receiving hole, and sealing components (6) are sleeved on both ends of the gear shaft (3), and the sealing components (6) are sleeved in the receiving hole of the fixing plate (5).

3. A centrifugal compressor shaft end leakage gas cooling and recycling system according to claim 2, characterized in that: The receiving hole is a stepped hole. The sealing assembly (6) comprises a plurality of sealing disks (6.1) and pressure rings (6.2) which are arranged in sequence and at intervals. The pressure ring (6.2) located at the innermost side is fixedly connected to the fixed disk (5).

4. A centrifugal compressor shaft end leakage gas cooling and recycling system according to claim 3, characterized in that: A first sealing ring (7) is arranged between the innermost pressure ring (6.2) and the fixed disk (5).

5. A centrifugal compressor shaft end leakage gas cooling and recycling system according to claim 3, characterized in that: The inner side wall of the fixed disk (5) is provided with a first gas collection annular groove (8), the outer side wall of the fixed disk (5) and / or the inner side wall of the mounting hole of the gear box (2) is provided with a second gas collection annular groove (9), the fixed disk (5) is also provided with at least one first connecting channel (10) connecting the first gas collection annular groove (8) and the second gas collection annular groove (9), and the gear box (2) is also provided with at least one second connecting channel (11) connecting the second gas collection annular groove (9) and the recovery pipeline (1).

6. A centrifugal compressor shaft end leakage gas cooling and recycling system according to claim 5, characterized in that: A plurality of second sealing rings (12) are arranged between the fixing plate (5) and the mounting hole, and the second sealing rings (12) are located on both sides of the second gas collection annular groove (9).

7. A centrifugal compressor shaft end leakage gas cooling and recycling system according to claim 5, characterized in that: At least one of the pressure rings (6.2) is provided with a vent hole (13), and two ends of the vent hole (13) are respectively connected to the first gas collection ring groove (8) and the inner hole of the pressure ring (6.2).

8. The centrifugal compressor shaft end leakage gas cooling and recycling system according to claim 5, characterized in that: The gear box (2) comprises a box body and a box cover, and the box cover and the box body are matched to form the mounting hole.

9. The centrifugal compressor shaft end leakage gas cooling and recycling system according to claim 1, characterized in that: Impellers are installed at both ends of the gear shaft (3).

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