An integrated structure of an expander and a compressor for a compressed air energy storage system

Abstract

The present invention provides an integrated structure of an expander and a compressor for a compressed air energy storage system, belonging to the technical field of energy storage equipment, including: a casing, in which a first stationary blade is installed in the inner ring cavity, and a second stationary blade is installed in the outer ring cavity; an inner rotor is rotatably arranged in the inner ring cavity of the casing, and a number of first moving blades cooperating with the first stationary blade are installed on the inner rotor at intervals; an outer rotor is rotatably arranged in the outer ring cavity of the casing, and a number of second moving blades cooperating with the second stationary blade are installed on the outer rotor at intervals; a first central shaft is connected to the inner rotor; a second central shaft is concentrically sleeved outside the first central shaft, and the second central shaft is connected to the outer rotor; for the integrated structure of the expander and the compressor for the compressed air energy storage system of the present invention, the structure of the expander and the structure of the compressor are set as an integrated machine with concentric sleeves, the structure is more compact, and a large amount of floor space can be saved during installation.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and particularly to an integrated structure of an expander and a compressor for a compressed air energy storage system. Background Art

[0002] The proportion of new energy (such as renewable energy sources like wind power and photovoltaic power generation) in the electricity share is gradually increasing. However, due to the uncertainty of new energy, it affects the stability of the power grid. Therefore, new energy needs to be used in conjunction with energy storage, and energy storage technology plays an important role in improving the stability and safety of the power grid.

[0003] Compressed air energy storage is a physical energy storage technology that has been verified to achieve large-scale energy storage. A conventional compressed air energy storage system includes parts such as an electric motor, a compressor, a heat exchange accumulator, an expander, a generator, and a gas storage device.

[0004] In the prior art, the compressor and the expander are separately arranged, resulting in a relatively large overall floor area and lack of compactness. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the relatively large floor area and lack of compactness of the compressor and the expander in the prior art, so as to provide an integrated structure of an expander and a compressor for a compressed air energy storage system.

[0006] To solve the above technical problem, the present invention provides an integrated structure of an expander and a compressor for a compressed air energy storage system, including:

[0007] A casing, which is a concentric double-ring cavity structure. A number of first stationary blades are installed at intervals in the inner ring cavity, and a number of second stationary blades are installed at intervals in the outer ring cavity;

[0008] An inner rotor, which is rotatably arranged in the inner ring cavity of the casing. A number of first moving blades that cooperate with the first stationary blades are installed at intervals on the inner rotor;

[0009] An outer rotor, which is rotatably arranged in the outer ring cavity of the casing. A number of second moving blades that cooperate with the second stationary blades are installed at intervals on the outer rotor;

[0010] A first central shaft, which is connected to the inner rotor and used to connect to a generator or a motor through the first central shaft;

[0011] A second central shaft, which is concentrically sleeved outside the first central shaft. The second central shaft is connected to the outer rotor and used to connect to a generator or a motor through the second central shaft.

[0012] Optionally, it further includes: a generator motor having a drive shaft, on which there is a first shaft body for detachably connecting to the first central shaft, and the drive shaft further has a second shaft body for detachably connecting to the second central shaft, and the second shaft body is concentrically sleeved outside the first shaft body.

[0013] Optionally, the first shaft body and the first central shaft are connected by meshing, and the connection or separation between the first shaft body and the first central shaft is achieved through mutual axial movement.

[0014] Optionally, a first external gear is provided on the first shaft body, and a first internal gear that mates with the first external gear is provided on the first central shaft.

[0015] Optionally, the second shaft body and the second central shaft are connected by meshing, and the connection or separation between the second shaft body and the second central shaft is achieved through mutual axial movement.

[0016] Optionally, a second external gear is provided on the second shaft body, and a second internal gear that mates with the second external gear is provided on the second central shaft.

[0017] Optionally, the first moving blade and the second moving blade are connected as a whole.

[0018] Optionally, bearings are provided between both ends of the inner ring cavity of the casing and the inner rotor, and bearings are provided between both ends of the outer ring cavity of the casing and the outer rotor.

[0019] Optionally, the first moving blade on the inner rotor is an expander moving blade, and the expander moving blade gradually becomes smaller along the direction away from the generator motor on the first central shaft; the second moving blade on the outer rotor is a compressor moving blade, and the compressor moving blade gradually becomes larger along the direction away from the generator motor on the second central shaft.

[0020] Optionally, the first moving blade on the inner rotor is a compressor moving blade, and the second moving blade on the outer rotor is an expander moving blade.

[0021] The technical solution of the present invention has the following advantages:

[0022] The integrated structure of the expander and the compressor for the compressed air energy storage system provided by the present invention sets the structure of the expander and the structure of the compressor as an integrated machine with concentric sleeves, which is more compact, and a large amount of floor space can be saved during installation. Description of the Drawings

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 This is a front view cross-sectional view of an embodiment of the integrated structure of an expander and a compressor for a compressed air energy storage system provided in the embodiments of the present invention.

[0025] Explanation of reference numerals:

[0026] 1. Casing; 2. Inner ring cavity; 3. Outer ring cavity; 4. First stationary blade; 5. Second stationary blade; 6. Inner rotor; 7. Outer rotor; 8. First moving blade; 9. Second moving blade; 10. First central shaft; 11. Second central shaft; 12. Generator motor; 13. Drive shaft. Specific embodiments

[0027] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] This embodiment provides an integrated structure of an expander and a compressor for a compressed air energy storage system, which is used for a compressed air energy storage system.

[0032] As Figure 1 shown, a specific embodiment of the integrated structure of the expander and the compressor for the compressed air energy storage system provided by this embodiment includes: a casing 1, the casing 1 is a double-ring cavity structure arranged concentrically. A number of first stationary vanes 4 arranged at intervals are installed in the inner ring cavity 2, and a number of second stationary vanes 5 arranged at intervals are installed in the outer ring cavity 3. An inner rotor 6 and an outer rotor 7 are arranged in the casing 1. The inner rotor 6 is rotatably arranged in the inner ring cavity 2 of the casing 1, and a number of first moving vanes 8 cooperating with the first stationary vanes 4 are installed on the inner rotor 6 at intervals; the outer rotor 7 is rotatably arranged in the outer ring cavity 3 of the casing 1, and a number of second moving vanes 9 cooperating with the second stationary vanes 5 are installed on the outer rotor 7 at intervals. The center of the inner rotor 6 is connected to a first central shaft 10, and the first central shaft 10 is used to connect to a generator or a motor; the center of the outer rotor 7 is connected to a second central shaft 11, and the second central shaft 11 is concentrically sleeved outside the first central shaft 10, and the second central shaft 11 is used to connect to a generator or a motor. For example: the first stationary vane 4 and the first moving vane 8 can be the stationary vane and the moving vane of the expander. At this time, the second stationary vane 5 and the second moving vane 9 are the stationary vane and the moving vane of the compressor, the first central shaft 10 is connected to the generator, and the second central shaft 11 is connected to the motor. In addition, the first stationary vane 4 and the first moving vane 8 can also be the stationary vane and the moving vane of the compressor. At this time, the second stationary vane 5 and the second moving vane 9 are the moving vanes of the expander, the first central shaft 10 is connected to the motor, and the second central shaft 11 is connected to the generator.

[0033] The integrated structure of the expander and the compressor for the compressed air energy storage system provided by this embodiment sets the structure of the expander and the structure of the compressor as an integrated machine arranged concentrically, and the structure is more compact. When installed, a large amount of floor space can be saved.

[0034] As Figure 1As shown in the figure, in the integrated structure of an expander and a compressor for a compressed air energy storage system provided in this embodiment, it further includes: a power generation motor 12. The power generation motor 12 has a drive shaft 13. The drive shaft 13 has a first shaft body for detachably connecting to the first central shaft 10. The drive shaft 13 also has a second shaft body for detachably connecting to the second central shaft 11. The second shaft body is concentrically sleeved outside the first shaft body. When the first shaft body of the drive shaft 13 is connected to the first central shaft 10, the second shaft body is separated from the second central shaft 11. At this time, the power generation motor 12 is associated with the first moving blade 8. When the structures of the first moving blade 8 and the first stationary blade 4 are those of an expander, the power generation motor 12 can be driven to rotate and generate electricity by the first moving blade 8. When the second shaft body of the drive shaft 13 is connected to the second central shaft 11, the first shaft body is separated from the first central shaft 10. At this time, the power generation motor 12 is associated with the second moving blade 9. When the structures of the second moving blade 9 and the second stationary blade 5 are those of a compressor, the second moving blade 9 can be driven to rotate and do work by the power generation motor 12.

[0035] In addition, as an alternative embodiment, the power generation motor 12 can be replaced by a separate generator and motor.

[0036] As Figure 1 shown in the figure, in the integrated structure of an expander and a compressor for a compressed air energy storage system provided in this embodiment, the first shaft body and the first central shaft 10 are connected by meshing, and the first shaft body and the first central shaft 10 are connected or separated by mutual axial movement. Specifically, the first shaft body is provided with a first external gear, and the first central shaft 10 is provided with a first internal gear that cooperates with the first external gear. When the first shaft body and the first central shaft 10 move axially, the first external gear and the first internal gear can be misaligned, thereby separating. In addition, as an alternative implementation, the first shaft body and the first central shaft 10 can also be connected and separated by mutual snap-fit.

[0037] As Figure 1 shown in the figure, in the integrated structure of an expander and a compressor for a compressed air energy storage system provided in this embodiment, the second shaft body and the second central shaft 11 are connected by meshing, and the second shaft body and the second central shaft 11 are connected or separated by mutual axial movement. For example, by moving the power generation motor 12, the axial movement of the drive shaft 13 can be realized; or, the drive shaft 13 is arranged to be axially movable on the power generation motor 12.

[0038] As Figure 1As shown in the figure, in the integrated structure of an expander and a compressor for a compressed air energy storage system provided in this embodiment, a second external gear is provided on the second shaft body, and a second internal gear that cooperates with the second external gear is provided on the second central shaft 11. When the second shaft body and the second central shaft 11 move axially, the second external gear and the second internal gear can be misaligned and separated from each other.

[0039] As Figure 1 shown in the figure, in the integrated structure of an expander and a compressor for a compressed air energy storage system provided in this embodiment, between the inner ring cavity 2 and the outer ring cavity 3 of the casing 1, the first moving blade 8 and the second moving blade 9 are connected as a whole. Further, the first moving blade 8 and the second moving blade 9 are installed on the same hub, and the rotation of the hub can drive the first moving blade 8 and the second moving blade 9 to rotate simultaneously.

[0040] As Figure 1 shown in the figure, in the integrated structure of an expander and a compressor for a compressed air energy storage system provided in this embodiment, bearings are provided between both ends of the inner ring cavity 2 of the casing 1 and the inner rotor 6, and bearings are provided between both ends of the outer ring cavity 3 of the casing 1 and the outer rotor 7. Through the setting of the bearings, the stability of the rotor rotating inside the inner ring cavity 2 and the outer ring cavity 3 can be improved.

[0041] As Figure 1 shown in the figure, in the integrated structure of an expander and a compressor for a compressed air energy storage system provided in this embodiment, the first moving blade 8 on the inner rotor 6 is an expander moving blade, and the expander moving blade gradually becomes smaller along the direction away from the power generation motor 12 along the first central shaft 10. The second moving blade 9 on the outer rotor 7 is a compressor moving blade, and the compressor moving blade gradually becomes larger along the direction away from the power generation motor 12 along the second central shaft 11; that is to say, the hub connecting the first moving blade 8 and the second moving blade 9 is a conical barrel structure. With such a setting, the inlets of both the expander and the compressor can be arranged at the end far from the power generation motor 12, thereby making the structure more compact and reasonable.

[0042] In addition, as an alternative embodiment, the first moving blade 8 on the inner rotor 6 can be a compressor moving blade, and the second moving blade 9 on the outer rotor 7 can be an expander moving blade.

[0043] Working principle

[0044] The integrated structure of an expander and a compressor for a compressed air energy storage system provided in this embodiment, during operation, when collecting energy with the expander, the drive shaft 13 of the power generation motor 12 can be connected to the first central shaft 10, and the gas drives the power generation motor 12 to do work by impinging on the first moving blade 8. When releasing energy with the compressor, the drive shaft 13 of the power generation motor 12 can be connected to the second central shaft 11, and the second moving blade 9 is driven to rotate by the power generation motor 12, thereby performing work for releasing energy.

[0045] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of the present invention.

Claims

1. An integrated structure of an expander and a compressor for a compressed air energy storage system, characterized in that, Comprising: A casing (1), which is a double-ring cavity structure arranged concentrically. A number of first stationary vanes (4) are installed at intervals in the inner ring cavity (2), and a number of second stationary vanes (5) are installed at intervals in the outer ring cavity (3); An inner rotor (6), which is rotatably arranged in the inner ring cavity (2) of the casing (1). A number of first moving vanes (8) that cooperate with the first stationary vanes (4) are installed at intervals on the inner rotor (6); An outer rotor (7), which is rotatably arranged in the outer ring cavity (3) of the casing (1). A number of second moving vanes (9) that cooperate with the second stationary vanes (5) are installed at intervals on the outer rotor (7); A first central shaft (10), which is connected to the inner rotor (6); A second central shaft (11), which is concentrically sleeved outside the first central shaft (10), and the second central shaft (11) is connected to the outer rotor (7); A generating motor (12), which has a drive shaft (13). The drive shaft (13) has a first shaft body for detachably connecting to the first central shaft (10), and the drive shaft (13) also has a second shaft body for detachably connecting to the second central shaft (11). The second shaft body is concentrically sleeved outside the first shaft body.

2. The integrated structure of an expander and a compressor for a compressed air energy storage system according to claim 1, characterized in that, The first shaft body and the first central shaft (10) are connected by meshing, and the first shaft body and the first central shaft (10) are connected or separated by mutual axial movement.

3. The integrated structure of an expander and a compressor for a compressed air energy storage system according to claim 2, characterized in that, A first external gear is provided on the first shaft body, and a first internal gear that cooperates with the first external gear is provided on the first central shaft (10).

4. The integrated structure of an expander and a compressor for a compressed air energy storage system according to any one of claims 1 - 3, characterized in that, The second shaft body and the second central shaft (11) are connected by meshing, and the second shaft body and the second central shaft (11) are connected or separated by mutual axial movement.

5. The integrated structure of an expander and a compressor for a compressed air energy storage system according to claim 4, characterized in that, A second external gear is provided on the second shaft body, and a second internal gear that cooperates with the second external gear is provided on the second central shaft (11).

6. The integrated structure of an expander and a compressor for a compressed air energy storage system according to any one of claims 1 - 3, characterized in that, The first moving vane (8) and the second moving vane (9) are connected as a whole.

7. The integrated structure of an expander and a compressor for a compressed air energy storage system according to any one of claims 1 - 3, characterized in that, Bearings are provided between the two ends of the inner ring cavity (2) of the casing (1) and the inner rotor (6), and bearings are provided between the two ends of the outer ring cavity (3) of the casing (1) and the outer rotor (7).

8. The integrated structure of an expander and a compressor for a compressed air energy storage system according to any one of claims 1 - 3, characterized in that, The first moving vane (8) on the inner rotor (6) is an expansion machine moving vane, and the expansion machine moving vane gradually becomes smaller along the direction away from the generating motor (12) of the first central shaft (10); the second moving vane (9) on the outer rotor (7) is a compressor moving vane, and the compressor moving vane gradually becomes larger along the direction away from the generating motor (12) of the second central shaft (11).

9. The integrated structure of an expander and a compressor for a compressed air energy storage system according to any one of claims 1 - 3, characterized in that, The first moving vane (8) on the inner rotor (6) is a compressor moving vane, and the second moving vane (9) on the outer rotor (7) is an expansion machine moving vane.

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