Gearbox for supercritical carbon dioxide power generation

Abstract

The utility model relates to the technical field of supercritical carbon dioxide power generation, in particular to a gearbox for supercritical carbon dioxide power generation, which comprises a box body, a high-speed shaft and a low-speed shaft are rotatably arranged on the box body, and a first dry gas sealing moving ring and a second dry gas sealing moving ring are arranged on the high-speed shaft. A first bearing and a second bearing are arranged between the first dry gas sealing moving ring and the second dry gas sealing moving ring, gears are arranged on the high-speed shaft and the low-speed shaft, a speed measuring gear is arranged on one side of the low-speed shaft, and the first bearing and the second bearing are arranged on the low-speed shaft. And the transmission efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of supercritical carbon dioxide power generation technology, and more specifically, to a gearbox for supercritical carbon dioxide power generation. Background Technology

[0002] Supercritical carbon dioxide power generation is an advanced energy conversion technology. Its core lies in using supercritical carbon dioxide as a working fluid to convert thermal energy into electrical energy. This technology is based on the Brayton cycle and includes four basic processes: compression, heating, expansion, and cooling. In the cycle, carbon dioxide is pressurized by a compressor and enters the supercritical state, where it has excellent fluidity and heat transfer performance. Subsequently, it is heated to high temperature and high pressure in a heat exchanger, enters a turbine to expand and do work, drives a generator to generate electricity through a gearbox, and finally returns to its initial state through a cooler, forming a closed cycle.

[0003] For example, Chinese Patent Publication: Tidal Power Generation Gearbox, Application No.: CN201921261630.9, includes: a gearbox, the gearbox including a main shaft housing (6); a hub with blades; a main shaft (3) disposed in the main shaft housing (6), one end of the main shaft (3) extending out of the main shaft housing (6) and fixedly connected to the hub; a mechanical seal device (1) disposed at one end of the main shaft (3) extending out of the main shaft housing (6) for bidirectional sealing of the main shaft housing (6); a gear transmission structure disposed in the gearbox, the main shaft (3) being the input shaft of the gear transmission structure, and the output end of the gear transmission structure being connected to the input end of the generator. The tidal power generation gearbox provided by this utility model effectively reduces the volume of the tidal power generation gearbox and lowers the cost.

[0004] However, among the above technical solutions, supercritical carbon dioxide power generation is a new type of energy storage project, and an integral gear expander that assembles the pneumatic volute and gearbox into one unit is one implementation scheme; however, the unconventional operating environment such as high temperature and large axial force may exist, which brings difficulties and challenges to the design of the gearbox. Utility Model Content

[0005] The main purpose of this utility model is to provide a gearbox for supercritical carbon dioxide power generation, which can effectively solve the problem that in the background technology, supercritical carbon dioxide power generation is a new type of energy storage project, and an integral gear expander that assembles the pneumatic volute and gearbox into one unit is one of the implementation schemes; however, the unconventional operating environment such as high temperature and large axial force may exist, which brings difficulties and challenges to the design of the gearbox.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A gearbox for supercritical carbon dioxide power generation includes a housing, on which a high-speed shaft and a low-speed shaft are rotatably mounted. A first dry gas sealing ring and a second dry gas sealing ring are mounted on the high-speed shaft. A first bearing and a second bearing are disposed between the first dry gas sealing ring and the second dry gas sealing ring. Gears are mounted on the high-speed shaft and the low-speed shaft. A speed measuring gear is disposed on one side of the low-speed shaft. The first bearing and the second bearing are also disposed on the low-speed shaft.

[0008] Preferably, the first bearing and the second bearing are mounted on the high-speed shaft.

[0009] Preferably, the two gears mesh with each other.

[0010] Preferably, the speed measuring gear includes a gear body, and a speed measuring auxiliary patch is provided on the gear body.

[0011] Preferably, the speed measuring gear is equipped with a gear speed measuring instrument on the housing, and the gear speed measuring instrument is equipped with wires.

[0012] Preferably, the gear body is mounted on the low-speed shaft.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) In use, three impellers are first installed on the high-speed shaft. Then, the impellers are driven to rotate by the gas medium supercritical carbon dioxide, which drives the high-speed shaft to rotate. Subsequently, the gear on the high-speed shaft drives the gear on the low-speed shaft to rotate. The gear 7 is assembled with the low-speed shaft by the baking interference fit. The low-speed shaft is connected to the motor through the shaft extension coupling, which drives the motor to do work and generate electricity. Since the first and second bearings are specially designed tilting thrust bearings, they can meet the requirements of high specific pressure, high linear velocity, vertical force angle adjustment, and bearing internal oil supply to reduce bearing operating temperature. The housing adopts a fully welded housing and reasonably sets the stiffeners to control the overall deformation of the housing. The design of the integral gear supercritical carbon dioxide power generation gearbox is realized, which has the characteristics of compact structure, high power density and high transmission efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a gearbox for supercritical carbon dioxide power generation according to the present invention;

[0016] Figure 2 This is a schematic diagram of the speed measuring gear in a gearbox for supercritical carbon dioxide power generation according to this utility model.

[0017] In the diagram: 1. High-speed shaft; 2. First bearing; 3. Second bearing; 4. First dry gas seal ring; 5. Second dry gas seal ring; 6. Low-speed shaft; 7. Gear; 8. Speed ​​measuring gear; 801. Gear body; 802. Speed ​​measuring auxiliary patch; 803. Gear speed meter; 804. Wire; 9. First bearing; 10. Second bearing; 11. Housing. Detailed Implementation

[0018] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0019] like Figure 1 As shown, a gearbox for supercritical carbon dioxide power generation includes a housing 11. A high-speed shaft 1 and a low-speed shaft 6 are rotatably mounted on the housing 11. A first dry gas sealing ring 4 and a second dry gas sealing ring 5 are mounted on the high-speed shaft 1. A first bearing 2 and a second bearing 3 are disposed between the first dry gas sealing ring 4 and the second dry gas sealing ring 5. Gears 7 are mounted on the high-speed shaft 1 and the low-speed shaft 6. A speed measuring gear 8 is disposed on one side of the low-speed shaft 6. A first bearing 9 and a second bearing 10 are mounted on the low-speed shaft 6.

[0020] like Figure 2 As shown, in another embodiment of the present invention, the speed measuring gear 8 includes a gear body 801, and a speed measuring auxiliary patch 802 is provided on the gear body 801.

[0021] The speed measuring gear 8 is equipped with a gear speed measuring instrument 803 on the housing 11, and the gear speed measuring instrument 803 is equipped with a wire 804.

[0022] When the low-speed shaft 6 rotates, it drives the gear body 801 to rotate, and the gear body 801 drives the speed measuring auxiliary patch 802 to rotate. Then, the speed of the low-speed shaft 6 is calculated by the gear speed measuring instrument 803 and the speed measuring auxiliary patch 802, and the calculated data is transmitted to the designated location through the wire 804.

[0023] The working principle of a gearbox for supercritical carbon dioxide power generation:

[0024] In operation, three impellers are first installed on the high-speed shaft 1. Then, the impellers are driven to rotate by the supercritical carbon dioxide gas medium, which in turn drives the high-speed shaft 1 to rotate. Subsequently, the gear 7 on the high-speed shaft 1 drives the gear 7 on the low-speed shaft 6 to rotate. The gear 7 is assembled with the low-speed shaft 6 by an interference fit. The low-speed shaft 6 is connected to the motor through a shaft extension coupling, which drives the motor to generate electricity. Since the first bearing 9 and the second bearing 10 are specially designed tilting thrust bearings, they can meet the requirements of high specific pressure, high linear velocity, vertical force angle adjustment, and individual oil supply inside the bearing to reduce the bearing operating temperature. The housing 11 adopts a fully welded housing with reasonable ribs, which can control the overall deformation of the housing. This realizes the design of an integral gear type supercritical carbon dioxide power generation gearbox, which has the characteristics of compact structure, high power density, and high transmission efficiency.

[0025] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A supercritical carbon dioxide power generating gearbox comprising a casing (11), characterised in that: The box (11) is provided with a high-speed shaft (1) and a low-speed shaft (6) rotatably arranged thereon, the high-speed shaft (1) is provided with a first dry gas seal moving ring (4) and a second dry gas seal moving ring (5), the first dry gas seal moving ring (4) and the second dry gas seal moving ring (5) are provided with a first bearing (2) and a second bearing (3) therebetween, the high-speed shaft (1) and the low-speed shaft (6) are provided with a gear (7), one side of the low-speed shaft (6) is provided with a speed measuring gear (8), and the low-speed shaft (6) is provided with a first bearing (9) and a second bearing (10).

2. A supercritical carbon dioxide power generation gearbox according to claim 1, characterized by: The first bearing (2) and the second bearing (3) are mounted on the high-speed shaft (1).

3. A supercritical carbon dioxide power generation gearbox according to claim 2, characterized by: The two gears (7) are meshed with each other.

4. A supercritical carbon dioxide power generation gearbox according to claim 3, characterized by: The speed measuring gear (8) comprises a gear body (801), and the gear body (801) is provided with a speed measuring auxiliary patch (802).

5. A supercritical carbon dioxide power generation gearbox according to claim 4, characterized by: The speed measuring gear (8) is provided with a gear tachometer (803) on the box (11), and the gear tachometer (803) is provided with a wire (804).

6. A supercritical carbon dioxide power generation gearbox according to claim 5, characterized by: The gear body (801) is mounted on the low-speed shaft (6).

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