Multi-shaft centrifugal compressor with electric turning gear

Abstract

The utility model discloses a multi-shaft centrifugal compressor with an electric turning gear, which comprises a first gear shaft, the first gear shaft is in shaft connection with a half coupling, one side of the first gear shaft is in shaft connection with a third gear shaft, the third gear shaft is arranged in a gear box, one end of the third gear shaft is in shaft connection with a third impeller, and the other end of the third gear shaft is in shaft connection with a second impeller. The other end of the third gear shaft is connected with a driven ratchet wheel which is meshed with a driving ratchet wheel, the driving ratchet wheel is in shaft connection with an electric barring gear, and an installation disc is arranged at the bottom of the electric barring gear and installed on the gear box through bolts. According to the scheme, the electric barring gear is additionally arranged on the main machine body of the multi-shaft centrifugal compressor, so that the problems of difficulty in barring and low barring efficiency of the multi-shaft centrifugal compressor are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of multi - shaft centrifugal compressors, in particular to a multi - shaft centrifugal compressor with an electric barring device. Background Art

[0002] The multi - shaft centrifugal compressor is a high - speed rotating machine, and the compressor needs to be barring - operated during the installation stage, before starting and running, and during shutdown for maintenance.

[0003] At present, the barring of multi - shaft centrifugal compressors during the installation stage, before starting and running, and during shutdown for maintenance mostly adopts manual barring, which is time - consuming and laborious and extremely inconvenient. A small part uses an electric / hydraulic barring device installed on the speed - change gearbox or steam turbine for barring. Electric / hydraulic barring methods simply cannot bar the large - scale multi - shaft centrifugal compressor directly driven by an electric motor, because the electric / hydraulic barring device is generally installed on the speed - change gearbox or steam turbine, and it is impossible to set an electric / hydraulic barring device for the large - scale multi - shaft centrifugal compressor directly driven by an electric motor. Content of the Utility Model

[0004] The purpose of the utility model is to disclose a multi - shaft centrifugal compressor with an electric barring device for the technical defects existing in the prior art.

[0005] In order to achieve the purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0006] A multi - shaft centrifugal compressor with an electric barring device includes a first gear shaft, the first gear shaft is shaft - connected to a half - coupling, one side of the first gear shaft is shaft - connected to a third gear shaft, the third gear shaft is arranged in a gearbox, one end of the third gear shaft is shaft - connected to a third impeller, the other end of the third gear shaft is connected to a driven ratchet wheel, the driven ratchet wheel meshes with a driving ratchet wheel, the driving ratchet wheel is shaft - connected to an electric barring device, and the bottom of the electric barring device is provided with a mounting plate, and the mounting plate is installed on the gearbox through bolts.

[0007] Further, the other side of the first gear shaft is shaft - connected to a second gear shaft.

[0008] Further, both ends of the second gear shaft are respectively shaft - connected to a first impeller and a second impeller, a first volute is arranged outside the first impeller, and a second volute is arranged outside the second impeller.

[0009] Further, a third volute is arranged outside the third impeller.

[0010] Compared with the prior art, the advantages of the utility model are as follows:

[0011] This solution installs an electric barring gear on the main body of a multi-shaft centrifugal compressor, solving the problems of difficult barring and low barring efficiency of the multi-shaft centrifugal compressor. Brief Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the electric barring gear;

[0013] Figure 2 It is a schematic diagram of the installation structure;

[0014] Figure 3 It is a side view of the installation structure;

[0015] Figure 4 It is a schematic diagram of the installation plate structure;

[0016] Figure 5 It is Figure 4 An enlarged view of the structure at I. Detailed Description of the Preferred Embodiments

[0017] The following further describes the present invention in detail with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] Embodiment 1

[0019] A multi-shaft centrifugal compressor with a built-in electric barring gear includes a first gear shaft 1, the first gear shaft 1 is axially connected to a half coupling 2, the two sides of the first gear shaft 1 are respectively axially connected to a second gear shaft 3 and a third gear shaft 4, the third gear shaft 4 is arranged in a gearbox 8, one end of the third gear shaft 4 is axially connected to a third impeller 7, the other end of the third gear shaft 4 is connected to a driven ratchet 9, the driven ratchet 9 meshes with a driving ratchet 10, the driving ratchet 10 is axially connected to an electric barring gear 11, the bottom of the electric barring gear 11 is provided with an installation disk 12, and the installation disk 12 is installed on the gearbox 8 through bolts.

[0020] Both ends of the second gear shaft 3 are respectively axially connected to a first impeller 5 and a second impeller 6, a first volute 13 is arranged outside the first impeller 5, and a second volute 14 is arranged outside the second impeller 6.

[0021] A third volute 15 is arranged outside the third impeller 7.

[0022] Its usage method is as follows:

[0023] Taking Figure 1 as an example, it is described as follows:

[0024] Figure 1It is a three-stage multi-shaft centrifugal compressor with three gear shafts, namely the first gear shaft 1 (input shaft), the second gear shaft 3, and the third gear shaft 4. One end of the first gear shaft 1 is shrink-fitted with a half coupling 2, both ends of the second gear shaft 3 are respectively connected to the first impeller 5 and the second impeller 6, one end of the third gear shaft 4 is connected to the third impeller 7, and the other end is shrink-fitted with a driven ratchet 9. The driving ratchet 10 on the electric barring device 11 can be manually engaged with the driven ratchet 9 through the handle of the electric barring device 11, and the electric barring of the multi-shaft centrifugal compressor can be realized by the rotation of the barring motor of the electric barring device 11. When the multi-shaft compressor starts, when the speed of the third gear shaft 4 reaches the preset speed, the driving ratchet 10 on the electric barring device 11 automatically disengages from the driven ratchet 9 on the third gear shaft 4 of the multi-shaft centrifugal compressor.

[0025] The mounting plate 12 of the electric barring device 11 is bolted to the gear housing 8 of the multi-shaft centrifugal compressor.

[0026] Of course, the electric barring device 11 can also be arranged at other positions of the multi-shaft centrifugal compressor, such as a gear shaft of the multi-shaft centrifugal compressor (one end of this gear shaft does not need to be connected with an impeller or a half coupling, which is determined according to the actual situation).

[0027] Embodiment 2

[0028] An installation and connection structure type between a large multi-shaft centrifugal compressor and a foundation includes a foundation concrete platform 16. A steel structure base 17 is embedded in the foundation concrete platform 16. An installation plate 19 is connected to the steel structure base 17 through a number of pad iron groups 18. A centrifugal compressor 20 is installed on the installation plate 19. A number of jacks 21 are symmetrically distributed on both sides of the transverse central axis of the installation plate 19. A number of connecting screws 22 are arranged on both sides of the installation plate 19. A positioning pin 23 is arranged on the installation plate 19. Two limit blocks 24 are arranged on the installation plate 19.

[0029] Its usage method is as follows:

[0030] The installation and connection between the large multi-shaft compressor and the foundation is divided into two parts.

[0031] When making the compressor foundation, a steel structure base 17 is embedded into the concrete platform 16. The steel plate at the top of the embedded steel structure base 17 uses a thick steel plate of 100 - 120 mm. When embedding, ensure that the installation top surface of the thick steel plate is 30 - 50 mm higher than the foundation cement surface and ensure a certain levelness requirement.

[0032] During installation, the large multi-shaft centrifugal compressor is connected to several mounting plates 19 by bolts, and the mounting plates 19 are welded to the top of the thick steel plate of the steel structure base 17 embedded in the concrete platform 16. Between the mounting plate 19 and the embedded steel structure base 17, the level of the multi-shaft centrifugal compressor can be adjusted by using leveling nuts (jack 21) and a set of inclined shims 18.

[0033] After the installation and adjustment of the multi-shaft centrifugal compressor are completed (after the mounting plate 19 is welded to the steel structure base 17), two limit blocks 24 are welded to the corresponding positions of the chassis of the multi-shaft centrifugal compressor box body and the embedded steel structure base 17. The multi-shaft centrifugal compressor is positioned by combining the positioning pins 19 located on the multi-shaft compressor and the mounting plate 19.

[0034] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A multi-axis centrifugal compressor with a built-in electric barring device, including a first gear shaft (1), characterized in that: The first gear shaft (1) is axially connected to the half coupling (2). One side of the first gear shaft (1) is axially connected to the third gear shaft (4). The third gear shaft (4) is arranged inside the gearbox (8). One end of the third gear shaft (4) is axially connected to the third impeller (7). The other end of the third gear shaft (4) is connected to a driven ratchet wheel (9). The driven ratchet wheel (9) meshes with a driving ratchet wheel (10). The driving ratchet wheel (10) is axially connected to an electric barring gear (11). The bottom of the electric barring gear (11) is provided with a mounting plate (12). The mounting plate (12) is mounted on the gearbox (8) by bolts.

2. The multi-shaft centrifugal compressor with a built-in electric barring gear according to claim 1, characterized in that: The other side of the first gear shaft (1) is axially connected to the second gear shaft (3).

3. The multi-axis centrifugal compressor with a built-in electric barring gear according to claim 2, wherein: Both ends of the second gear shaft (3) are respectively axially connected to a first impeller (5) and a second impeller (6). A first volute (13) is arranged outside the first impeller (5). A second volute (14) is arranged outside the second impeller (6).

4. The multi-shaft centrifugal compressor with a built-in electric barring gear according to claim 1, characterized in that: A third volute (15) is arranged outside the third impeller (7).

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