阅读说明：本技术 一种膨胀发电一体式高速膨胀机 (High-speed expander of inflation electricity generation integral type ) 是由 周东 邓浩 郭擎 张建云 文鑫 于 2019-11-13 设计创作，主要内容包括：本发明公开了一种膨胀发电一体式高速膨胀机,它结构简单紧凑,整机效率更高。包括依次设置的涡轮导流壳、高速发电机壳、排气导流壳,高速发电机壳包括高速发电机外壳体、高速发电机内壳体,高速发电机外壳体、高速发电机内壳体之间形成涡轮排气流道,且与涡轮排气口连通；高速发电机内壳体部分伸入排气导流壳内,与排气导流壳之间形成出口流道,排气导流壳背离高速发电机壳的一端为乏气排气口；高速发电机内壳体通过磁浮式径向轴承安装高速轴,高速轴对应排气口的一端设置轴流风扇,用于把涡轮排气口处的部分乏气引入高速发电机壳体内部进行降温。(The invention discloses an expansion and power generation integrated high-speed expander which is simple and compact in structure and higher in overall efficiency. The high-speed generator comprises a turbine guide shell, a high-speed generator shell and an exhaust guide shell which are sequentially arranged, wherein the high-speed generator shell comprises a high-speed generator outer shell and a high-speed generator inner shell, and a turbine exhaust runner is formed between the high-speed generator outer shell and the high-speed generator inner shell and is communicated with a turbine exhaust port; the high-speed generator inner shell part extends into the exhaust diversion shell, an outlet flow channel is formed between the exhaust diversion shell and the exhaust diversion shell, and one end of the exhaust diversion shell, which is far away from the high-speed generator shell, is an exhaust gas outlet; the high-speed shaft is installed in the high-speed generator inner shell through the magnetic suspension type radial bearing, and the axial flow fan is arranged at one end, corresponding to the exhaust port, of the high-speed shaft and used for introducing partial exhaust gas at the turbine exhaust port into the high-speed generator inner shell to cool.)

1. The utility model provides an expansion power generation integral type high-speed expander which characterized in that: the high-speed generator comprises a turbine guide shell, a high-speed generator shell and an exhaust guide shell which are sequentially arranged, wherein the high-speed generator shell comprises a high-speed generator outer shell and a high-speed generator inner shell, and two ends of the high-speed generator outer shell are fixedly connected with the turbine guide shell and the exhaust guide shell respectively to form an integrated shell;

a high-speed shaft is arranged in the integrated shell along the axial lead direction, a turbine stator is arranged in the turbine guide shell, a turbine rotor is arranged on the high-speed shaft and matched with the turbine stator, one end of the turbine guide shell, which is far away from the high-speed generator shell, is a turbine air inlet, and the other end of the turbine guide shell is a turbine air outlet; a turbine exhaust runner is formed between the high-speed generator outer shell and the high-speed generator inner shell; a disc-shaped turbine guide plate is sleeved above the high-speed shaft and positioned in a turbine guide shell, the turbine guide plate is fixed at the end part of the inner shell of the high-speed generator, the shape of the turbine guide plate corresponds to that of the turbine guide shell, and an air guide flow passage is formed between the turbine guide plate and the turbine guide shell so as to communicate a turbine exhaust port with a turbine exhaust flow passage; the high-speed generator inner shell part extends into the exhaust diversion shell, an outlet flow channel is formed between the exhaust diversion shell and the exhaust diversion shell, and one end of the exhaust diversion shell, which is far away from the high-speed generator shell, is an exhaust gas outlet;

a generator stator is arranged in the high-speed generator inner shell, a generator rotor is arranged on the high-speed shaft and matched with the generator stator, the high-speed shaft is supported on the high-speed generator inner shell through a magnetic levitation type radial bearing, the magnetic levitation type radial bearing is distributed on two sides of the generator rotor in the axial direction, a thrust disc is arranged on the high-speed shaft, and the magnetic levitation type thrust bearing is arranged on the high-speed generator inner shell and matched with the thrust disc; the high-speed shaft is provided with an axial flow fan corresponding to one end of the exhaust diversion shell and used for introducing partial exhaust at the exhaust port of the turbine into the high-speed generator shell for cooling, and the turbine diversion shell is provided with a vent hole for gas to pass through.

2. The expansion and power generation integrated high-speed expander according to claim 1, wherein: and a rolling bearing for accident protection is arranged between the high-speed shaft and the inner shell of the high-speed generator, the rolling bearing for accident protection is distributed on the outer side of the magnetic suspension type radial bearing, and a vent hole is formed in the part of the inner shell of the high-speed generator, which is provided with the rolling bearing for accident protection, for gas to pass through.

3. The expansion and power generation integrated high-speed expander according to claim 1, wherein: and a turbine air inlet flange is arranged at the inlet end of the turbine guide shell and used for axially positioning the turbine stator.

4. The expansion and power generation integrated high-speed expander according to claim 1, wherein: and the inner shell of the generator is provided with radiating fins extending into the middle section of the exhaust flow passage of the turbine.

Technical Field

The invention relates to the technical field of Organic Rankine Cycle (ORC) power generation, in particular to an expansion and power generation integrated high-speed expander.

Background

In the field of Organic Rankine Cycle (ORC) power generation, the efficiency of an organic working medium expansion machine has a large influence on the system efficiency, and the system efficiency can be effectively improved by improving the efficiency of the expansion machine. For a conventional organic working medium expansion unit (namely, the expander works and then drives the generator to generate electricity by decelerating through the gear box), the working medium drives the turbine to work and the generator outputs electric energy, and in the process, the loss of an air inlet and exhaust shell, the loss of an expander bearing, the loss of mechanical seal, the loss of the gear box, the loss of a coupler and the like reduces the efficiency of the whole machine by about 6-12 percent, so that the organic working medium expansion unit is very unfavorable for an ORC system.

In the ORC system, working medium is at the system mesocycle, and the leakage rate of working medium has very big influence to the economic nature of system operation, and the mechanical seal is sealed between output shaft and the casing to the adoption mechanical seal of traditional organic working medium expander, and mechanical seal is contact seal, for the loss piece, and the leakage easily takes place for the working medium in the operation later stage. Meanwhile, the mechanical seal causes the shaft system of the expansion machine to be lengthened, which is not beneficial to the shaft system design, and the expansion machine cannot continue to develop to a high rotating speed due to the limit linear velocity.

Disclosure of Invention

The invention aims to solve the problems of low efficiency, complex structure and the like of a conventional organic working medium expansion machine, and provides an expansion and power generation integrated high-speed expansion machine which is simple and compact in structure and higher in overall efficiency.

The purpose of the invention is realized as follows:

an expansion and power generation integrated high-speed expander comprises a turbine guide shell, a high-speed generator shell and an exhaust guide shell which are sequentially arranged, wherein the high-speed generator shell comprises a high-speed generator outer shell and a high-speed generator inner shell, and two ends of the high-speed generator outer shell are fixedly connected with the turbine guide shell and the exhaust guide shell respectively to form an integrated shell;

a high-speed shaft is arranged in the integrated shell along the axial lead direction, a turbine stator is arranged in the turbine guide shell, a turbine guide cover is arranged at the air inlet end of the turbine stator, a turbine rotor is arranged on the high-speed shaft and matched with the turbine stator, a turbine air inlet is formed in one end, away from the high-speed generator shell, of the turbine guide shell, and a turbine air outlet is formed in the other end of the turbine guide shell; a turbine exhaust runner is formed between the high-speed generator outer shell and the high-speed generator inner shell; a disc-shaped turbine guide plate is sleeved above the high-speed shaft and positioned in a turbine guide shell, the turbine guide plate is fixed at the end part of the inner shell of the high-speed generator, the shape of the turbine guide plate corresponds to that of the turbine guide shell, and an air guide flow passage is formed between the turbine guide plate and the turbine guide shell so as to communicate a turbine exhaust port with a turbine exhaust flow passage; the high-speed generator inner shell part extends into the exhaust diversion shell, an outlet flow channel is formed between the exhaust diversion shell and the exhaust diversion shell, and one end of the exhaust diversion shell, which is far away from the high-speed generator shell, is an exhaust gas outlet;

a generator stator is arranged in the high-speed generator inner shell, a generator rotor is arranged on the high-speed shaft and matched with the generator stator, the high-speed shaft is supported on the high-speed generator inner shell through a magnetic levitation type radial bearing, the magnetic levitation type radial bearing is distributed on two sides of the generator rotor in the axial direction, a thrust disc is arranged on the high-speed shaft, and the magnetic levitation type thrust bearing is arranged on the high-speed generator inner shell and matched with the thrust disc; the high-speed shaft is provided with an axial flow fan corresponding to one end of the exhaust diversion shell and used for introducing partial exhaust at the exhaust port of the turbine into the high-speed generator shell for cooling, and the turbine diversion shell is provided with a vent hole for gas to pass through.

Preferably, a rolling bearing for accident protection is arranged between the high-speed shaft and the inner shell of the high-speed generator, the rolling bearing for accident protection is distributed on the outer side of the magnetic suspension type radial bearing, and a vent hole is formed in the part, where the rolling bearing for accident protection is installed, of the inner shell of the high-speed generator for gas to pass through.

Preferably, the inlet end of the turbine guide shell is provided with a turbine air inlet flange for axially positioning the turbine stator.

Preferably, the inner shell of the generator is provided with a radiating fin extending into the middle section of the exhaust flow passage of the turbine.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

1. the structure is compact, the turbine shell is connected with the high-speed generator shell, and the turbine exhaust shell and the generator shell are integrated, so that the turbine exhaust shell in the traditional sense is omitted, and the space is greatly saved;

2. the sealing effect is better, and turbine and generator rotating member are all installed inside the casing, and the complete machine does not have the output shaft, and the totally enclosed casing guarantees that the theoretical rate of revealing is zero.

3. The power generation efficiency is high, the turbine rotor and the generator rotor are coaxial, the transmission efficiency is improved,

4. the generator adopts the magnetic suspension type bearing, and the bearing and the shaft are not in relative contact, so that compared with the traditional expander, the generator has the advantages that the integral totally-enclosed design is benefited, the mechanical seal is omitted, and the service life and the maintenance period are longer.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings. In the attached drawing, 1 is a turbine air inlet flange, 2 is a turbine guide shell, 3 is a turbine guide plate, 4 is a high-speed generator outer shell, 5 is a high-speed generator inner shell, 6 is a high-speed shaft, 7 is a generator stator, 8 is a radiating fin, 9 is an exhaust guide shell, 10 is an axial fan, 11 is a magnetic suspension type radial bearing, 12 is a generator rotor, 13 is a magnetic suspension type thrust bearing, 14 is a thrust disc, 15 is a rolling bearing for accident protection, 16 is a turbine stator, 17 is a turbine rotor, 18 is an air inlet guide sleeve, and 19 is an air vent.

As shown in fig. 1, the expansion and power generation integrated high-speed expander comprises a turbine guide shell, a high-speed generator shell and an exhaust guide shell which are sequentially arranged, wherein the high-speed generator shell comprises a high-speed generator outer shell and a high-speed generator inner shell, and two ends of the high-speed generator outer shell are fixedly connected with the turbine guide shell and the exhaust guide shell respectively to form an integrated shell.

A high-speed shaft is arranged in the integrated shell along the axial lead direction, a turbine stator is arranged in the turbine guide shell, a turbine guide cover is arranged at the air inlet end of the turbine stator and used for guiding incoming flow gas and reducing air inlet loss, a turbine rotor is arranged on the high-speed shaft and matched with the turbine stator, a turbine air inlet is formed in one end, away from the high-speed generator shell, of the turbine guide shell, and a turbine air outlet is formed in the other end of the turbine guide shell; and a turbine air inlet flange is arranged at the inlet end of the turbine guide shell and used for axially positioning the turbine stator. A turbine exhaust runner is formed between the high-speed generator outer shell and the high-speed generator inner shell; and the inner shell of the generator is provided with radiating fins extending into the middle section of the exhaust flow passage of the turbine. A disc-shaped turbine guide plate is sleeved above the high-speed shaft and positioned in a turbine guide shell, the turbine guide plate is fixed at the end part of the inner shell of the high-speed generator, the shape of the turbine guide plate corresponds to that of the turbine guide shell, and an air guide flow passage is formed between the turbine guide plate and the turbine guide shell so as to communicate a turbine exhaust port with a turbine exhaust flow passage; the high-speed generator inner shell part extends into the exhaust diversion shell, an outlet flow channel is formed between the exhaust diversion shell and the exhaust diversion shell, and one end of the exhaust diversion shell, which is far away from the high-speed generator shell, is an exhaust gas outlet;

a generator stator is arranged in the high-speed generator inner shell, a generator rotor is arranged on the high-speed shaft and matched with the generator stator, the high-speed shaft is supported on the high-speed generator inner shell through a magnetic levitation type radial bearing, the magnetic levitation type radial bearing is distributed on two sides of the generator rotor in the axial direction, a thrust disc is arranged on the high-speed shaft, and the magnetic levitation type thrust bearing is arranged on the high-speed generator inner shell and matched with the thrust disc; the high-speed shaft is provided with an axial flow fan corresponding to one end of the exhaust diversion shell and used for introducing partial exhaust at the exhaust port of the turbine into the high-speed generator shell for cooling, and the turbine diversion shell is provided with a vent hole for gas to pass through. And a rolling bearing for accident protection is arranged between the high-speed shaft and the inner shell of the high-speed generator, the rolling bearing for accident protection is distributed on the outer side of the magnetic suspension type radial bearing, and a vent hole is formed in the part of the inner shell of the high-speed generator, which is provided with the rolling bearing for accident protection, for gas to pass through.

The expansion and power generation integrated high-speed expander is an axial exhaust type organic working medium expander, mainly comprises a turbine part sleeve and a magnetic suspension bearing type high-speed generator. The high-speed shaft 6 is sequentially provided with a turbine rotor 17, a thrust disc 14, a high-speed generator rotor 12 and an axial flow fan 10, the high-speed shaft 6 drives the high-speed generator rotor to rotate after the turbine works, mechanical energy is converted into electric energy and then is output outwards, the high-speed shaft 6 drives the axial flow fan 10 to rotate, a part of organic working medium exhaust gas passes through the vent holes 19 on the turbine guide shell and the vent holes 19 on the turbine side of the inner shell 5 of the high-speed generator and is led into the inner part of the high-speed generator shell, and then is discharged through the vent holes 19 on the exhaust side of the inner shell 5 of the high-speed generator, so. The high-speed generator casing divides into interior casing 5 and shell body 4, install generator stator 7 within the interior casing, magnetic suspension journal bearing 11, magnetic suspension thrust bearing 13 and antifriction bearing 15 for the accident protection, have great clearance between magnetic suspension journal bearing 11 and the high-speed axle 6, can the air feed stream pass through, be turbine exhaust runner between interior casing of high-speed generator and the shell body, the interior casing outside is equipped with along the radiating fin 8 of axial arrangement for cool down generator stator. The turbine guide shell 2 is arranged on the outer shell 4 of the high-speed generator, and the turbine stator 16 is arranged on the guide shell. The turbine inlet flange 1 is mounted on the turbine guide shell 2 and axially positions the turbine stator 16. The turbine guide plate 3 is arranged on the inner shell 5 of the generator, and a gap is reserved between the turbine guide plate 3 and the turbine rotor 17 to prevent interference.

Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.