CN210370807U - Direct-drive power generation device of turboexpander - Google Patents

Abstract

The utility model discloses a turbo expander that electricity generation field used directly drives power generation facility, its structure includes expander spiral case, expander impeller, generator shell, electricity generation rotor, and the electricity generation rotor includes rotor body and electricity generation pivot, the generator shell includes front end plate and rear end plate, the tip of electricity generation pivot is spacing on front end plate and rear end plate through front bearing and rear bearing respectively, the expander impeller is located above-mentioned electricity generation pivot along the axis cover, front bearing and rear bearing are gas bearing. The power generation device adopts the integrated design of the turbine expander and the generator, reduces the connection structure between the expander and the generator, reduces the production cost, improves the energy conversion rate, facilitates subsequent maintenance operation, reduces the operation external condition requirement of the power generation device, and enlarges the application range. And the support application of the gas bearing reduces the friction force of the generator rotor in the power generation process, and provides guarantee for the power generation effect.

Description

Direct-drive power generation device of turboexpander

Technical Field

The utility model relates to a turbo expander in electricity generation field directly drives power generation facility.

Background

The turboexpander utilizes gas with certain pressure to perform adiabatic expansion in the turboexpander to do work externally so as to consume internal energy of the gas. At the moment, the generator drives the internal generator rotor by utilizing the isentropic expansion work process of the generator, thereby completing the power generation operation. In the process of generating power, the turboexpander and the generator are usually connected through a speed reducer, so that better energy conversion operation is realized. However, the power generation device is complex in structure and large in size, and the space reasonable configuration efficiency is reduced. Meanwhile, a special oil station is needed to supply oil to and lubricate the bearing when the power generation device works, lubricating oil needs to be replaced periodically, the working requirement is high, the occupied area is large, and the running cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem provide an effectively enlarge turbo expander of power generation facility range of application directly drives power generation facility.

The utility model provides a technical scheme that its technical problem adopted is:

a direct-drive power generation device of a turbine expander comprises an expander volute, an expander impeller, a generator shell and a generator rotor, wherein the generator rotor comprises a rotor body and a generator rotating shaft, the generator rotating shaft and the rotor body are coaxially sleeved and extend out of two ends of the rotor body, the expander impeller is positioned in the expander volute, the generator shell comprises a front end plate and a rear end plate, the expander volute is provided with an installation through hole towards the generator rotor, the end part of the generator rotating shaft is limited on the front end plate and the rear end plate through a front bearing and a rear bearing respectively, the expander volute is connected with the front end plate in a sealing manner, one end of the generator rotating shaft penetrates through the front bearing and enters the expander volute through the installation through hole, the expander impeller is sleeved on the generator rotating shaft along the axis, and the front bearing and the rear bearing are gas bearings, the front end plate and the rear end plate are provided with bearing air inlet interfaces towards the front bearing and the rear bearing, and the generator shell is provided with a generator cooling air inlet and a generator cooling air outlet.

This power generation facility is connected the expander impeller is direct with the power generation bearing of generator rotor, the power generation bearing utilizes gas bearing to support the operation this moment, the frictional force of the generator rotor among the power generation process has been reduced, guarantee is provided for the generating effect, adopt turboexpander and generator integral type design simultaneously, connection structure between expander and the generator has been reduced, production cost is reduced, the energy conversion rate has been improved, and subsequent maintenance operation has been made things convenient for, the operation external condition demand of this power generation facility has been reduced, the range of application has been enlarged.

Further, the front bearing is a radial thrust combined gas bearing, the rear bearing is a radial gas bearing, a main thrust disc and an auxiliary thrust disc are sleeved on the rotating shaft of the generator, the main thrust disc and the auxiliary thrust disc are respectively arranged on two sides of the front bearing, and the main thrust disc is arranged on the side, far away from the expansion impeller, of the front bearing.

The utility model has the advantages that:

1. the expansion impeller of the device is directly sleeved on the rotor shaft of the generator, namely, the turbine expander and the generator are designed in an integrated mode, so that the connection structure between the expander and the generator is reduced, the size is reduced, the requirements for installation and control are reduced, the cost is reduced, meanwhile, the gas bearing is adopted, the rotor can be suspended in a bearing gas film in the power generation process, the friction resistance of the rotor of the generator in the working process of the generator is reduced, the power generation efficiency is improved, the type of a gas source adopted by the gas bearing is not limited, the application range of the power generation device is ensured, the flexible application of the device is guaranteed, in addition, the arrangement of a cooling gas outlet of the generator on a generator shell can realize the discharge of cooling gas on one hand, and the discharge of the bearing gas can also be realized on the other hand, so that the stable power generation;

2. radial thrust combined gas bearing and radial gas bearing and the epaxial main thrust dish of motor rotor and vice thrust dish mating reaction have avoided the generator rotor to take place the jamming phenomenon because of thermal expansion when guaranteeing motor rotor's axial position, provide the guarantee for generating electricity operation's steady step.

Drawings

FIG. 1 is a sectional view of the overall structure of a direct drive power generation device of a turboexpander according to the present invention;

labeled as: the expansion machine comprises an expansion machine volute 1, a volute inlet 11, a volute outlet 12, an expansion machine impeller 2, a generator casing 3, a front end plate 31, a rear end plate 32, a generator cooling air inlet 33, a generator cooling air outlet 34, a generator output cable inlet hole 35, a bearing fixing plate 36, a generator stator 4, a generator rotor 5, a main thrust disc 51, an auxiliary thrust disc 52, a generator rotating shaft 53, a front bearing 6, a front bearing air supply interface 61, a rear bearing 7 and a rear bearing air supply interface 71.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

The structure of the direct-drive power generation device of the turboexpander is shown in figure 1, and a generator stator 4 is arranged on a generator shell 3 and faces a rotor body 5. The generator casing 3 is provided with a front end plate 31 and a rear end plate 32 at both ends thereof, and the generator rotating shafts 53 at both ends of the generator rotor 5 are fixed to the front end plate 31 and the rear end plate 32 through a front bearing 6 and a rear bearing 7, respectively. The front bearing 6 is fixed by a bearing fixing plate 36. The front bearing 6 and the rear bearing 7 both adopt gas bearings, so that the rotor can be suspended in a bearing gas film in the power generation process, the friction resistance of the generator rotor in the working process of the generator is reduced, and the power generation efficiency is improved. And the type of the gas source adopted by the gas bearing is not limited, so that the application range of the power generation device is ensured. In the embodiment shown in fig. 1, the front bearing 6 is a combined thrust gas bearing, and the rear bearing 7 is a radial gas bearing. At this time, the radial gas bearing is directly fixed to the rear end plate, and the corresponding generator shaft 53 is installed in the radial gas bearing. The main thrust disc 51, the front bearing 6 and the auxiliary thrust disc 52 are sequentially sleeved and mounted on a generator rotating shaft 53 of the front bearing 6, namely the radial thrust combined gas bearing. The corresponding front bearing 6 is provided with a front bearing air supply interface 61 communicated with the outside, the rear bearing 7 is provided with a rear bearing air supply interface communicated with the outside, and when the front bearing 6 and the rear bearing 7 obtain corresponding pressure air source air supply, a pressure air film is formed in a fit clearance between the mounting bearing and the generator rotor, so that the generator rotor is suspended in the air film and is separated from the contact with the mounting bearing. The combined structure avoids the clamping stagnation phenomenon of the generator rotor due to thermal expansion while ensuring the axial position of the motor rotor, and provides guarantee for stable power generation operation. The front bearing 6 and the rear bearing 7 can be selected according to the actual working requirement. The end of the generator shaft 53 corresponding to the front bearing 6 passes through the sub-thrust disk 52 and enters the interior of the expander volute 1 through the mounting opening. Expander impeller 2 installs the cover along the axis of generator pivot 53 and establishes, and expander spiral case 1 carries out erection joint with front end plate 31 this moment, forms turboexpander and generator integral type design promptly, makes it reduce the connection structure between expander and the generator, and the device volume that corresponds has also realized reducing, has reduced the installation space demand, has improved the application environment flexibility.

In the application process, gas with certain pressure and temperature enters the expander volute 1 from the volute inlet 11, the gas is guided by the internal structure of the expander volute 1 to form high-speed airflow in a specific direction so as to push the expander impeller 2 to rotate, and further drive the generator rotating shaft 53 to rotate, the corresponding rotor body 5 also rotates, and at the moment, the rotor body 5 cuts the internal magnetic field generated by the generator stator 4, so that the power generation operation is completed. The external cable can pass through the generator output cable wire inlet hole 35 to realize the connection and installation with the transmission of the internal circuit of the generator, thereby realizing the external transmission operation of current. In the process of power generation, the gas entering the expander is subjected to work to realize pressure reduction and temperature reduction and is discharged from the volute outlet 12. At the same time, a generator cooling air inlet 33 and a generator cooling air outlet 34 are provided at the generator housing 3, and the generator cooling air outlet 34 can be used for discharging cooling air on the one hand and also for discharging bearing air on the other hand, so as to ensure good working quality of the device.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (2)

1. A direct-drive power generation device of a turboexpander comprises an expander volute (1), an expander impeller (2), a generator casing (3) and a generator rotor, wherein the generator rotor comprises a rotor body (5) and a generator rotating shaft (53), the generator rotating shaft (53) and the rotor body (5) are coaxially sleeved and extend out of two ends of the rotor body (5), the expander impeller (2) is positioned in the expander volute (1), the generator casing (3) comprises a front end plate (31) and a rear end plate (32), and the direct-drive power generation device is characterized in that the expander volute (1) is provided with an installation through hole towards the generator rotor, the end part of the generator rotating shaft (53) is limited on the front end plate (31) and the rear end plate (32) through a front bearing (6) and a rear bearing (7), and the expander volute (1) is connected with the front end plate (31) in a sealing way, the one end of generator shaft (53) is passed front bearing (6) and is passed in installation opening entering expander spiral case (1), above-mentioned generator shaft (53) is located along the axis cover in expander impeller (2), front bearing (6) and rear bearing (7) are gas bearing, front end plate (31) and rear end plate (32) are provided with the bearing interface of admitting air towards front bearing (6) and rear bearing (7), generator casing (3) are provided with generator cooling air inlet (33) and generator cooling gas outlet (34).

2. The turboexpander direct-drive power generation device as claimed in claim 1, wherein the front bearing (6) is a radial thrust combined gas bearing, the rear bearing (7) is a radial gas bearing, a main thrust disc (51) and an auxiliary thrust disc (52) are sleeved on the generator rotating shaft (53), the main thrust disc (51) and the auxiliary thrust disc (52) are respectively arranged on two sides of the front bearing (6), and the main thrust disc (51) is arranged on the side, far away from the expander impeller (2), of the front bearing (6).

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