Load rejection damper for expansion generator set

Abstract

A load rejection damper for an expansion generator set, comprising: a high-speed damping rotor, which is drivingly connected to the rotor of the expansion generator set; a low-speed damping rotor, and the high-speed damping rotor is drivingly connected to the low-speed damping rotor through a reduction gear structure. The low-speed damping rotor and the high-speed damping rotor are connected through the above reduction gear structure, and the high-speed damping rotor is drivingly connected to the rotor of the expansion generator set. It can effectively enable the high-speed damping rotor and the low-speed damping rotor to jointly provide a certain moment of inertia for the shafting of the expansion generator set, and can effectively reduce the maximum fly-up speed of the unit during the load rejection test, thereby protecting the safety of the unit and the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of load rejection tests for expansion generator sets, and particularly relates to a load rejection damper for an expansion generator set. Background Art

[0002] Energy storage systems can improve the economy, security, and stability of the power grid, and can significantly promote the peak shaving of the power grid. In recent years, they have received significant attention and development. However, since the power density per unit weight and per unit volume of the expander in a compressed air energy storage system is greater than that of a steam turbine unit in thermal power generation. However, the moment of inertia of the shafting of an expansion generator set is about half lower than that of a steam turbine generator set with the same power. Therefore, the maximum flying-up speed of the shafting during the load rejection test of a compressed air energy storage system expansion unit is higher than that of a thermal power steam turbine unit. In particular, the moment of inertia of the shafting of an expansion generator set in a supercritical carbon dioxide system is relatively lower, and the maximum flying-up speed of the shafting during the load rejection test is higher, which further seriously affects the safety of the unit and power grid operation.

[0003] To solve the above problems, those skilled in the art considered adding a rotor to the shafting of the expansion generator set to provide additional moment of inertia, which can effectively reduce the maximum flying-up speed during the load rejection test. The above structure is the damper. Since the damping rotor of the damper provides most of the moment of inertia by a cylinder in the middle, according to the calculation formula of the moment of inertia, since the moment of inertia of a rotating body is proportional to the fourth power of its outer diameter and the first power of its length, at this time, if a single-piece forged rotor structure scheme is adopted, the length and outer diameter of the forging are large, and it is difficult to guarantee the forging quality and the cost is very high. Because, for forgings, the outer diameter of a single long rotor cannot be too large when forging, and the thickness of a single disc cannot be too large either, otherwise it is difficult to guarantee the reliability of the forging quality. Therefore, those skilled in the art need a damper that can effectively provide a certain moment of inertia to reduce the maximum flying-up speed of the unit during the load rejection test. And, it can also effectively avoid the problems of large length and outer diameter of the forging, difficult to guarantee the forging quality, and high cost when adopting a single-piece forged rotor structure. Summary of the Invention

[0004] The present invention aims to provide a load rejection damper for an expansion generator set to solve the problem that in the prior art, the damper cannot effectively reduce the maximum flying-up speed of the unit during the load rejection test while avoiding the single-piece forged rotor structure, resulting in large length and outer diameter of the forging, difficult to guarantee the forging quality, and high cost. The present invention thus provides a load rejection damper for an expansion generator set, including:

[0005] A high-speed damping rotor, which is in transmission connection with the rotor of the expansion generator set;

[0006] A low-speed damping rotor, and the high-speed damping rotor is in transmission connection with the low-speed damping rotor through a reduction gear structure; moreover, at least two sleeve discs are arranged in the axial direction of the low-speed damping rotor.

[0007] Optionally, the reduction gear structure includes: a large gear arranged on the low-speed damping rotor, and a small gear arranged on the high-speed damping rotor and meshed with the large gear; the diameter of the large gear is greater than the diameter of the small gear.

[0008] Optionally, the high-speed damping rotor and the low-speed damping rotor are connected by straight-tooth gear meshing. The reduction gear structure further includes:

[0009] A thrust disc arranged between the large gear and the small gear for preventing axial relative displacement between the two; and / or,

[0010] Support bearings of the low-speed damping rotor are arranged at both ends in the axial direction of the low-speed damping rotor, and a thrust bearing with a sliding thrust surface is further arranged inside the support bearings of the low-speed damping rotor to prevent axial relative displacement between the large gear and the small gear.

[0011] Optionally, the large gear is arranged at a position close to the middle of the low-speed damping rotor.

[0012] Optionally, the large gear and the small gear are a set of mutually adapted herringbone gears to avoid the axial force generated by gear meshing.

[0013] Optionally, the herringbone gear-structured large gear is arranged at a position close to the middle of the low-speed damping rotor.

[0014] Optionally, the high-speed damping rotor is in transmission connection with the rotor of the expansion generator set through a flexible coupling; the connection end of the flexible coupling extends outside the damping machine housing.

[0015] Optionally, there are four sleeve discs, which are evenly arranged in the axial direction of the low-speed damping rotor.

[0016] Optionally, the length of the low-speed damping rotor is less than the length of the high-speed damping rotor, and the outer diameter dimension of the low-speed damping rotor is greater than the outer diameter dimension of the high-speed damping rotor; and / or,

[0017] The thickness of the large gear on the low-speed damping rotor is less than the thickness value of the small gear on the high-speed damping rotor, and the outer diameter dimension of the large gear on the low-speed damping rotor is greater than the outer diameter dimension of the small gear on the high-speed damping rotor.

[0018] The technical solution of the present invention has the following advantages:

[0019] 1. The load rejection damper for an expansion generator set provided by the present invention includes: a high-speed damping rotor, which is in transmission connection with the rotor of the expansion generator set; a low-speed damping rotor, and the high-speed damping rotor is in transmission connection with the low-speed damping rotor through a reduction gear structure.

[0020] In the present invention, the high-speed damping rotor is in transmission connection with the shafting of the expansion generator set; the low-speed damping rotor is linked with the above-mentioned low-speed damping rotor through a reduction gear structure. The above-mentioned high-speed damping rotor and low-speed damping rotor jointly provide a certain moment of inertia for the shafting of the expansion generator set, which can effectively reduce the maximum flying-up speed of the unit during the load rejection test, thereby protecting the safety of the unit and the power grid. Moreover, compared with the damper with a single rotor in the prior art, this structure also has the advantages of low stress level of rotating parts, low cost, and small static and dynamic loads on the foundation. The load rejection damper in the present invention is applicable to expansion generator sets in systems such as coal-fired, gas-fired, compressed air energy storage, supercritical carbon dioxide power generation, organic Rankine cycle, natural gas residual pressure utilization, and geothermal energy utilization.

[0021] 2. The load rejection damper for an expansion generator set provided by the present invention, the reduction gear structure includes: a large gear arranged on the low-speed damping rotor, and a small gear arranged on the high-speed damping rotor and meshing with the large gear; the diameter of the large gear is larger than the diameter of the small gear.

[0022] 3. The load rejection damper for an expansion generator set provided by the present invention, the reduction gear structure further includes: a thrust disc arranged between the large gear and the small gear to prevent axial relative displacement between the two; and / or, thrust bearings with sliding thrust surfaces are arranged at both ends of the low-speed damping rotor in the axial direction, to prevent axial relative displacement between the large gear and the small gear.

[0023] In the present invention, the high-speed damping rotor and the low-speed damping rotor can be meshed and connected through spur gears. In order to prevent axial movement of the above-mentioned low-speed damping rotor, in the present invention, by arranging the above-mentioned thrust disc, axial relative displacement between the high-speed damping rotor and the low-speed damping rotor can be maintained, avoiding axial movement of the low-speed damping rotor. In addition, axial limit of the low-speed damping rotor can also be achieved through the above-mentioned thrust bearings, preventing axial movement of the low-speed damping rotor.

[0024] 4. The load rejection damper for an expansion generator set provided by the present invention, the large gear is arranged at a position close to the middle of the low-speed damping rotor.

[0025] In the present invention, by disposing the large gear near the middle of the low-speed damping rotor. Alternatively, by disposing the large gear at the central position of the low-speed damping rotor, the radial loads on the high-speed damping rotor support bearings on both sides of the high-speed damping rotor can be made more uniform, thereby reducing the design difficulty of the rotor dynamics characteristics of the high-speed damping rotor.

[0026] 5. The load rejection damper for an expansion generator set provided by the present invention, wherein the large gear and the small gear are a set of gears with a herringbone tooth structure adapted to each other to avoid the axial force generated by gear meshing.

[0027] In the present invention, the large gear and the small gear are a set of gears with a herringbone tooth structure adapted to each other. This herringbone gear structure does not generate additional axial force and can maintain no relative displacement along the axial direction between the high-speed damping rotor and the low-speed damping rotor.

[0028] 6. The load rejection damper for an expansion generator set provided by the present invention,

[0029] The length of the low-speed damping rotor is less than the length of the high-speed damping rotor, and the outer diameter dimension of the low-speed damping rotor is greater than the outer diameter dimension of the high-speed damping rotor; and / or,

[0030] The thickness of the large gear on the low-speed damping rotor is less than the thickness value of the small gear on the high-speed damping rotor, and the outer diameter dimension of the large gear on the low-speed damping rotor is greater than the outer diameter dimension of the small gear on the high-speed damping rotor.

[0031] In the present invention, the outer extension end of the high-speed damping rotor is connected to the rotor of the expansion generator set for transmitting torque; the low-speed damping rotor is connected to the high-speed damping rotor through gear meshing, and gears are provided on both the high-speed damping rotor and the low-speed damping rotor. Since the rotational speed of the low-speed damping rotor is relatively low, it can be designed as a rotor with a relatively short length, a relatively large outer diameter, and a relatively large moment of inertia. Moreover, because the rotational speed of the low-speed damping rotor is relatively low and the rotational speed of the large gear on the low-speed damping rotor is relatively low, the linear velocity of the large gear or the sleeve disc is relatively low, and the structural stress level is not high. Therefore, it can be designed as a rotor with a relatively small thickness, a relatively large outer diameter, and a relatively large moment of inertia. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order 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, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1Schematic structural diagram of the load rejection damper of the expansion generator set provided in Embodiment 1 of the present invention;

[0034] Figure 2 Schematic structural diagram of the load rejection damper with the reduction gear located in the middle of the low-speed damping rotor provided in Embodiment 2 of the present invention;

[0035] Figure 3 Schematic structural diagram of the load rejection damper with the reduction gear being a herringbone gear provided in Embodiment 3 of the present invention.

[0036] Explanation of reference numerals:

[0037] 1 - High-speed damping rotor; 2 - Low-speed damping rotor; 3 - Sleeve wheel disc; 4 - Large gear; 5 - Small gear; 6 - Thrust disc; 7 - Support bearing of the low-speed damping rotor; 8 - Half coupling; 9 - Damper housing; 10 - Support bearing of the high-speed damping rotor. Detailed implementation manners

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] 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 accompanying drawings, and 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 should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, 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 situations.

[0041] 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.

[0042] Embodiment 1

[0043] discloses a load rejection damper for an expansion generator set, as Figure 1 shown, which includes:

[0044] A high-speed damping rotor 1, which is drivingly connected to the rotor of the expansion generator set; the above-mentioned high-speed damping rotor 1 is drivingly connected to the rotor of the expansion generator set through a half coupling 8; the connecting end of the half coupling 8 extends outside the damper housing 9;

[0045] A low-speed damping rotor 2, the high-speed damping rotor 1 is drivingly connected to the low-speed damping rotor 2 through a reduction gear structure; the reduction gear structure in this embodiment includes: a large gear 4 provided on the low-speed damping rotor 2, and a small gear 5 provided on the high-speed damping rotor 1 and meshing with the large gear 4; the diameter of the large gear 4 is larger than the diameter of the small gear 5.

[0046] The length of the above-mentioned low-speed damping rotor 2 is less than the length of the high-speed damping rotor 1, and the outer diameter dimension of the low-speed damping rotor 2 is larger than the outer diameter dimension of the high-speed damping rotor 1; moreover, the thickness of the large gear 4 on the low-speed damping rotor 2 is less than the thickness value of the small gear 5 on the high-speed damping rotor 1, and the outer diameter dimension of the large gear 4 on the low-speed damping rotor 2 is larger than the outer diameter dimension of the small gear 5 on the high-speed damping rotor 1.

[0047] In order to prevent axial relative displacement between the large gear 4 and the small gear 5, the reduction gear structure further includes: a thrust disc 6 provided between the large gear 4 and the small gear 5 for preventing axial relative displacement between the two.

[0048] In this embodiment, in order to enable the load rejection damper to provide sufficient moment of inertia for the shafting of the expansion generator set, four sleeve discs 3 are arranged in the axial direction of the low-speed damping rotor 2, and the four sleeve discs 3 are arranged in the axial direction of the low-speed damping rotor 2.

[0049] Of course, this embodiment does not specifically limit the specific structure for preventing axial relative displacement between the large gear 4 and the small gear 5. In other embodiments, in order to prevent axial relative displacement between the large gear 4 and the small gear 5, low-speed damping rotor support bearings 7 are arranged at both ends in the axial direction of the low-speed damping rotor 2, and a thrust bearing with a sliding thrust surface is further arranged inside the low-speed damping rotor support bearings 7 to prevent axial relative displacement between the large gear 4 and the small gear 5.

[0050] Of course, the number of the sleeve discs 3 on the low-speed damping rotor 2 in this embodiment is not specifically limited. In other embodiments, two sleeve discs 3, three sleeve discs 3, or even more than four sleeve discs 3 may be provided in the axial direction of the low-speed damping rotor 2.

[0051] Embodiment 2

[0052] Disclosed is a load rejection damper for an expansion generator set, as Figure 2 shown, which includes:

[0053] A high-speed damping rotor 1, which is in transmission connection with the rotor of the expansion generator set; the high-speed damping rotor 1 is in transmission connection with the rotor of the expansion generator set through a half coupling 8; the connection end of the half coupling 8 extends outside the damper housing 9;

[0054] A low-speed damping rotor 2, the high-speed damping rotor 1 is in transmission connection with the low-speed damping rotor 2 through a reduction gear structure; the reduction gear structure in this embodiment includes: a large gear 4 provided on the low-speed damping rotor 2, and a small gear 5 provided on the high-speed damping rotor 1 and meshing with the large gear 4; the diameter of the large gear 4 is larger than the diameter of the small gear 5.

[0055] The length of the low-speed damping rotor 2 is less than the length of the high-speed damping rotor 1, and the outer diameter dimension of the low-speed damping rotor 2 is larger than the outer diameter dimension of the high-speed damping rotor 1; moreover, the thickness of the large gear 4 on the low-speed damping rotor 2 is less than the thickness value of the small gear 5 on the high-speed damping rotor 1, and the outer diameter dimension of the large gear 4 on the low-speed damping rotor 2 is larger than the outer diameter dimension of the small gear 5 on the high-speed damping rotor 1.

[0056] In this embodiment, in order to provide sufficient moment of inertia for the shafting of the expansion generator set by the load rejection damper, four sleeve discs 3 are provided in the axial direction of the low-speed damping rotor 2, and the four sleeve discs 3 are arranged in the axial direction of the low-speed damping rotor 2.

[0057] In order to prevent axial relative displacement between the large gear 4 and the small gear 5, the large gear 4 is arranged at a position close to the middle of the low-speed damping rotor 2. One sleeve disc 3 is provided on the side of the large gear 4 on the low-speed damping rotor 2 close to the half coupling 8. Three sleeve discs 3 are provided on the side of the large gear 4 on the low-speed damping rotor 2 away from the half coupling 8.

[0058] Embodiment 3

[0059] Disclosed is a load rejection damper for an expansion generator set, as Figure 3 shown, which includes:

[0060] A high-speed damping rotor 1 is in transmission connection with the rotor of an expansion generator set; the high-speed damping rotor 1 is in transmission connection with the rotor of the expansion generator set through a flexible coupling 8; the connection end of the flexible coupling 8 extends outside the damping machine housing 9;

[0061] A low-speed damping rotor 2, the high-speed damping rotor 1 is in transmission connection with the low-speed damping rotor 2 through a speed reduction gear structure; in the present embodiment, the speed reduction gear structure includes: a large gear 4 provided on the low-speed damping rotor 2, and a small gear 5 provided on the high-speed damping rotor 1 and meshing with the large gear 4; the diameter of the large gear 4 is larger than the diameter of the small gear 5.

[0062] The length of the low-speed damping rotor 2 is less than the length of the high-speed damping rotor 1, and the outer diameter dimension of the low-speed damping rotor 2 is larger than the outer diameter dimension of the high-speed damping rotor 1; and, the thickness of the large gear 4 on the low-speed damping rotor 2 is less than the thickness value of the small gear 5 on the high-speed damping rotor 1, and the outer diameter dimension of the large gear 4 on the low-speed damping rotor 2 is larger than the outer diameter dimension of the small gear 5 on the high-speed damping rotor 1.

[0063] In the present embodiment, in order to enable the load rejection damping machine to provide sufficient moment of inertia for the shafting of the expansion generator set, four sleeve discs 3 are arranged in the axial direction of the low-speed damping rotor 2, and the four sleeve discs 3 are arranged in the axial direction of the low-speed damping rotor 2.

[0064] In order to prevent axial relative displacement between the large gear 4 and the small gear 5, the large gear 4 and the small gear 5 are a set of mutually adapted herringbone gears to avoid the axial force generated by gear meshing. And the large gear 4 with the herringbone tooth structure is arranged at a position close to the middle of the low-speed damping rotor 2.

[0065] Obviously, the above embodiments are only 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 variations can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A load rejection damper for an expansion generator set, characterized in that Comprising: A high-speed damping rotor (1), which is in transmission connection with the rotor of the expansion generator set; A low-speed damping rotor (2), and the high-speed damping rotor (1) is in transmission connection with the low-speed damping rotor (2) through a reduction gear structure; The reduction gear structure includes: a large gear (4) arranged on the low-speed damping rotor (2), and a small gear (5) arranged on the high-speed damping rotor (1) and meshing with the large gear (4); the diameter of the large gear (4) is larger than the diameter of the small gear (5); The large gear (4) is arranged at a position close to the middle of the low-speed damping rotor (2); the large gear (4) and the small gear (5) are a set of herringbone gears adapted to each other to avoid the axial force generated by gear meshing.

2. The load rejection damper for an expansion generator set according to claim 1, characterized in that, The reduction gear structure further includes: A thrust disc (6) arranged between the large gear (4) and the small gear (5) for preventing their axial relative displacement; and / or, Low-speed damping rotor support bearings (7) are arranged at both ends in the axial direction of the low-speed damping rotor (2), and a thrust bearing with a sliding thrust surface is further arranged inside the low-speed damping rotor support bearings (7) to prevent axial relative displacement between the large gear (4) and the small gear (5).

3. The load rejection damper for an expansion generator set according to claim 1, characterized in that, The herringbone gear-structured large gear (4) is arranged at a position close to the middle of the low-speed damping rotor (2).

4. The load rejection damper for an expansion generator set according to any one of claims 1 to 3, characterized in that, At least two sleeve discs (3) are arranged in the axial direction of the low-speed damping rotor (2).

5. The load rejection damper for an expansion generator set according to claim 1, wherein The high-speed damping rotor (1) is in transmission connection with the rotor of the expansion generator set through a flexible coupling (8); the connection end of the flexible coupling (8) extends outside the damping machine housing (9).

6. The load rejection damper for an expansion generator set according to claim 4, characterized in that, There are four sleeve discs (3), which are evenly arranged in the axial direction of the low-speed damping rotor (2).

7. The load rejection damper for an expansion generator set according to claim 1, characterized in that The length of the low-speed damping rotor (2) is less than the length of the high-speed damping rotor (1), and the outer diameter dimension of the low-speed damping rotor (2) is larger than the outer diameter dimension of the high-speed damping rotor (1); and / or, The thickness of the large gear (4) on the low-speed damping rotor (2) is less than the thickness value of the small gear (5) on the high-speed damping rotor (1), and the outer diameter dimension of the large gear (4) on the low-speed damping rotor (2) is larger than the outer diameter dimension of the small gear (5) on the high-speed damping rotor (1).

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