High-mechanical-strength blade structure of centrifugal compressor
By using a split-structure design and fiber composite materials, the mechanical strength and repairability of the centrifugal compressor main blades have been improved, solving the problem of blade damage under high speed and heavy load, extending service life and reducing processing costs.
Patent Information
- Application Number
- CN202423263350.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-27
AI Technical Summary
The main blades of existing centrifugal compressors are susceptible to lateral impact loads under high-speed and heavy-load conditions, and are also prone to damage from condensed ice particles and foreign objects in low-temperature and humid environments, resulting in insufficient mechanical strength and affecting reliability and service life.
The high mechanical strength blade adopts a split structure design, including a leading edge tube, a trailing edge tube, a main beam, a support beam, and a skin. It is fixed by a hot compression molding process, and uses fiber composite materials to improve mechanical strength. SW280F100a/8522 glass cloth fiber layer, plain weave carbon cloth/8522 fiber layer and N40J/8522 fiber layer are laid on the skin to enhance mechanical strength.
It improves the mechanical strength and repairability of the blades, enabling them to withstand greater impacts, extend their service life, reduce processing difficulty and costs, and allow for targeted repairs when damaged, avoiding complete scrapping.
Smart Images
Figure CN223482968U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of new energy technology, and in particular to a high mechanical strength blade structure for a centrifugal compressor. Background Technology
[0002] Compressed air energy storage stores energy in the form of compressed air in an air storage device. When the power system's electricity load reaches its peak, the air storage device releases the stored compressed air, which expands in a turbine expander to do work and drive a generator to generate electricity. It has advantages such as large capacity, high efficiency, long life, and zero emissions, and has great development potential.
[0003] As a critical component in the operation of compressed air energy storage systems, compressors are becoming increasingly demanding in terms of speed, heavy load, and lightweight design. This leads to increased working length and parameters of the main blades, resulting in harsher operating conditions and frequent accidents, often accompanied by significant catastrophic consequences. To achieve higher pressure ratios, higher rotational speeds are typically employed, making the main blades more susceptible to lateral impact loads. Uneven axial forces also accelerate compressor wear. Furthermore, condensation from ice particles and foreign object impacts in low-temperature, humid environments can cause irreversible damage to the main blades. Therefore, a high-mechanical-strength blade structure is urgently needed to improve the operational reliability of centrifugal compressors used in compressed air energy storage. Utility Model Content
[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a high mechanical strength blade structure for a centrifugal compressor, which features high mechanical strength, good repairability, long service life, and simple processing.
[0005] The high mechanical strength blade structure of the centrifugal compressor according to an embodiment of the present invention includes:
[0006] The main blade is a back blade and includes a leading edge tube, a trailing edge tube, a main beam, a support beam, and a skin, which are each independently manufactured. The main beam is snapped between the leading edge tube and the trailing edge tube to form an outer frame. The support beams are distributed within the outer frame to support the leading edge tube, the main beam, and the trailing edge tube respectively. The skin covers the outer surface of the outer frame and at least covers the leading edge tube.
[0007] According to the centrifugal compressor high mechanical strength blade structure of this utility model embodiment, when assembling the main blade, the leading edge tube, trailing edge tube, support beam and main beam are assembled first, then the skin is attached to the outer surface of the outer frame, and finally the fixing between the components of the main blade is completed by hot compression molding process, thereby improving the mechanical strength of the main blade.
[0008] According to the centrifugal compressor high mechanical strength blade structure of this utility model embodiment, the main blade adopts a split structure design. This split structure design has the following advantages: First, it can divide the large and complex main blade into smaller and relatively simple components for individual processing, reducing processing difficulty and cost; second, it can maximize the mechanical strength of the main blade, enabling it to withstand greater impacts; third, when the main blade is subjected to a large impact, the independent grid structure of the main blade divides the main blade into different areas, and the independent grid components in the impacted area can effectively absorb external forces, reducing the impact of the impact force on other parts of the main blade; fourth, once the main blade is damaged by a large load impact, it can be repaired in a targeted manner, improving the repairability of the main blade, extending its service life, and avoiding the scrapping of the entire main blade.
[0009] In some embodiments, the leading edge tube includes a first leading edge tube and a second leading edge tube that are opposite to each other, the trailing edge tube includes a first trailing edge tube and a second trailing edge tube that are opposite to each other, there are two main beams, the front ends of the first leading edge tube and the front ends of the second leading edge tube are connected, the front ends of the two main beams are respectively engaged with the rear ends of the first leading edge tube and the rear ends of the second leading edge tube, and the rear ends of the two main beams are respectively engaged with the front ends of the first trailing edge tube and the front ends of the second trailing edge tube, and the rear ends of the first trailing edge tube and the rear ends of the second trailing edge tube are connected.
[0010] In some embodiments, the front end of the first leading edge tube and the front end of the second leading edge tube are snapped together, or the first leading edge tube and the second leading edge tube are integrally formed; the rear end of the first trailing edge tube and the rear end of the second trailing edge tube are snapped together, or the first trailing edge tube and the second trailing edge tube are integrally formed.
[0011] In some embodiments, the leading edge tube, the trailing edge tube, the main beam, the support beam, and the skin are all fiber composite material components.
[0012] In some embodiments, the skin is formed by laminating SW280F100a / 8522 glass fiber layer, plain carbon cloth / 8522 fiber layer and N40J / 8522 fiber layer and has anisotropy.
[0013] In some embodiments, the thickness of the skin is 1 to 2 mm.
[0014] In some embodiments, the system further includes a hub and a mounting ring, the mounting ring being mounted on the hub and rotatable relative to the hub within a predetermined rotation angle range, the number of main blades being the same as the number of mounting rings, and the main blades being fixed one-to-one on the mounting rings.
[0015] In some embodiments, the system further includes miniature hubs, which are mounted on the hub and can rotate relative to the hub within a predetermined rotation angle range. The number of miniature hubs is the same as the number of mounting collars, and the mounting collars are fixed to the miniature hubs one by one.
[0016] In some embodiments, the main blade is fixed to the mounting collar by a connector, and the radial extension length of the main blade is adjustable.
[0017] In some embodiments, the mounting collar is provided with a radial limiting groove, one side of the main blade is embedded in the radial limiting groove, and the other side of the main blade extends axially out of the radial limiting groove.
[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0020] Figure 1 This is a schematic diagram of the high mechanical strength blade structure of a centrifugal compressor according to an embodiment of the present invention;
[0021] Figure 2 This is a cross-sectional schematic diagram of the main blade of the high mechanical strength blade structure of the centrifugal compressor according to an embodiment of the present invention.
[0022] Figure 3 This is a schematic diagram of the skin layer of the main blade of the high mechanical strength blade structure of the centrifugal compressor according to an embodiment of the present invention.
[0023] Figure 4 This is a schematic diagram showing the connection relationship between the mounting collar and the main blades of the high mechanical strength blade structure of the centrifugal compressor according to an embodiment of this utility model.
[0024] Figure label:
[0025] Main blade 1; leading edge tube 11; first leading edge tube 111; second leading edge tube 112; main beam 12; trailing edge tube 13; first trailing edge tube 131; support beam 14; skin 15; hub 2; mounting collar 3; radial limiting groove 31. Detailed Implementation
[0026] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.
[0027] The following combination Figures 1 to 4 This invention describes the high mechanical strength blade structure of a centrifugal compressor according to an embodiment of the present invention.
[0028] like Figures 1 to 4 As shown, the high mechanical strength blade structure of the centrifugal compressor according to an embodiment of the present invention includes a main blade 1. The main blade 1 is a back blade, used to accelerate the fluid on the back of the impeller and reduce the static pressure on the back of the impeller by using centrifugal force, thereby achieving the effect of balancing the axial force. The main blade 1 can adopt a fan-shaped structure or other shapes.
[0029] The main blade 1 comprises a leading edge tube 11, a trailing edge tube 13, a main beam 12, a support beam 14, and a skin 15, all of which are independently manufactured. The leading edge tube 11, trailing edge tube 13, main beam 12, and support beam 14 are each manufactured separately. The leading edge tube 11, trailing edge tube 13, and support beam 14 can be hollow internally, and the support beam 14 can be a square tube beam. The leading edge tube 11 and trailing edge tube 13 are connected to the main beam 12 to form an outer frame. The support beams 14 are spaced apart within the outer frame, forming multiple lattice structures to support the leading edge tube 11, main beam 12, and trailing edge tube 13 respectively, which helps improve the mechanical strength of the main blade 1. The skin 15 covers the outer surface of the outer frame and at least covers the leading edge tube 11. That is, the skin 15 can fully cover the outer surface of the outer frame, or it can partially cover the outer surface of the outer frame but at least cover the leading edge tube 11. The skin 15 helps to improve the mechanical strength of the main blade 1 and enable it to withstand greater impact. Since the impact on the main blade 1 is mainly concentrated at the leading edge, the outer surface of the leading edge tube 11 must be covered with the skin 15.
[0030] According to the centrifugal compressor high mechanical strength blade structure of this utility model embodiment, when assembling the main blade 1, the leading edge tube 11, the trailing edge tube 13, the support beam 14 and the main beam 12 are assembled first, then the skin 15 is attached to the outer surface of the outer frame, and finally the fixing between the components of the main blade 1 is completed by hot compression molding process, thereby improving the mechanical strength of the main blade 1.
[0031] According to the centrifugal compressor high mechanical strength blade structure of this utility model embodiment, the main blade 1 adopts a split structure design. This split structure design has the following advantages: First, it can divide the large and complex main blade 1 into smaller and relatively simple components for individual processing, reducing processing difficulty and cost; second, it can maximize the mechanical strength of the main blade 1, enabling it to withstand greater impacts; third, when the main blade 1 is subjected to a large impact, the independent grid structure of the main blade 1 divides the main blade 1 into different areas, and the independent grid components in the impacted area can effectively absorb external forces, reducing the impact of the impact force on other parts of the main blade 1; fourth, once the main blade 1 is subjected to a large load impact and breaks down, it can be repaired in a targeted manner, improving the repairability of the main blade 1, extending the service life of the main blade 1, and avoiding the scrapping of the entire main blade 1.
[0032] In some embodiments, the leading edge tube 11 includes a first leading edge tube 111 and a second leading edge tube 112 that are opposite to each other, the trailing edge tube 13 includes a first trailing edge tube 131 and a second trailing edge tube 132 that are opposite to each other, there are two main beams 12, the front ends of the first leading edge tube 111 and the front ends of the second leading edge tube 112 are connected, the front ends of the two main beams 12 are respectively engaged with the rear ends of the first leading edge tube 111 and the rear ends of the second leading edge tube 112, the rear ends of the two main beams 12 are respectively engaged with the front ends of the first trailing edge tube 131 and the front ends of the second trailing edge tube 132, and the rear ends of the first trailing edge tube 131 and the rear ends of the second trailing edge tube 132 are connected. Therefore, the main blade 1 with this split structure design has the following advantages: First, it can divide the large and complex main blade 1 into smaller and simpler components for individual processing, reducing processing difficulty and cost; second, the main blade 1 has high mechanical strength and can withstand greater impact; third, when the main blade 1 is subjected to a large impact, the independent grid structure of the main blade 1 divides the main blade 1 into different areas, and the independent grid components in the impact area can effectively absorb external force, reducing the impact of the impact force on other parts of the main blade 1; fourth, once the main blade 1 is subjected to a large load impact and breaks down, it can be repaired in a targeted manner, improving the repairability of the main blade 1, extending the service life of the main blade 1, and avoiding the scrapping of the entire main blade 1.
[0033] In some embodiments, the front end of the first leading edge tube 111 and the front end of the second leading edge tube 112 are snapped together, and the leading edge tube 11 is simple to manufacture, or the first leading edge tube 111 and the second leading edge tube 112 are integrally formed; the rear end of the first trailing edge tube 131 and the rear end of the second trailing edge tube 132 are snapped together, or the first trailing edge tube 131 and the second trailing edge tube 132 are integrally formed. Thus, the main blade 1 is simple to manufacture. Therefore, the main blade 1 with this split structure design has the following advantages: First, it can divide the large and complex main blade 1 into smaller and simpler components for individual processing, reducing processing difficulty and cost; second, the main blade 1 has high mechanical strength and can withstand greater impact; third, when the main blade 1 is subjected to a large impact, the independent grid structure of the main blade 1 divides the main blade 1 into different areas, and the independent grid components in the impact area can effectively absorb external force, reducing the impact of the impact force on other parts of the main blade 1; fourth, once the main blade 1 is subjected to a large load impact and breaks down, it can be repaired in a targeted manner, improving the repairability of the main blade 1, extending the service life of the main blade 1, and avoiding the scrapping of the entire main blade 1.
[0034] In some embodiments, the leading edge tube 11, trailing edge tube 13, main beam 12, support beam 14, and skin 15 are all fiber composite materials. Fiber composite materials have high mechanical strength and are lightweight. Preferably, the fiber composite material is a carbon fiber composite material.
[0035] In some embodiments, as Figure 3 As shown, the skin 15 is composed of anisotropic layers of SW280F100a / 8522 glass fiber cloth, plain weave carbon fiber cloth / 8522, and N40J / 8522 fiber cloth. Therefore, the skin 15 has high mechanical strength. For example, Figure 3 The diagram illustrates the structure of a skin 15, which uses multiple layers of SW280F100a / 8522 glass cloth fiber, plain weave carbon cloth / 8522 fiber, and N40J / 8522 fiber. Based on the material properties, the anisotropy of the skin 15 layup needs to be ensured, and parameters such as the thickness and laying angle of each layer are designed. First, the layup coordinate system is determined, with the blade axis at 0°, counterclockwise rotation being positive and clockwise rotation negative. Then, according to the fiber material laying process, the layers are laid from the inside out. This skin 15 significantly improves the surface strength of the blade and better guarantees the mechanical properties of the skin 15.
[0036] In some embodiments, the thickness of the skin 15 is 1–2 mm, which ensures that the mechanical strength of the skin 15 meets the requirements of the main blade 1. For example, Figure 3 The illustrated skin 15 has a thickness of 1.45 mm.
[0037] In some embodiments, as Figure 1 and Figure 4 As shown, the assembly also includes a hub 2 and mounting rings 3. The mounting rings 3 are mounted on the hub 2 and can rotate relative to the hub 2 within a predetermined rotation angle range. The number of main blades 1 is the same as the number of mounting rings 3. Each main blade 1 is fixed to a corresponding mounting ring 3. Specifically, the number of mounting rings 3 and the number of main blades 1 can be selected as needed. For example, when using five mounting rings 3 and five main blades 1, the angle between adjacent mounting rings 3 and the axis of the hub 2 is 72°, and the five main blades 1 are evenly spaced circumferentially around the hub 2. When using six mounting rings 3, the angle between adjacent mounting rings 3 and the axis of the hub 2 is 60°, and the five main blades 1 are evenly spaced circumferentially around the hub 2. Because the mounting rings 3 rotate relative to the hub 2 within a predetermined rotation angle range (-30° to +30°), the axial rotation angle, i.e., the deflection angle, of the main blades 1 can be adjusted. Appropriate adjustment of the circumferential rotation angle of the main blades 1 can effectively balance the axial force and resist fluid impact and foreign object collision.
[0038] In some embodiments, a miniature hub (not shown in the figure) is also included. The miniature hub is mounted on the hub 2 and can rotate relative to the hub 2 within a predetermined rotation angle range. The number of miniature hubs is the same as the number of mounting collars 3, and the mounting collars 3 are fixed to the miniature hubs one by one. That is to say, by setting the miniature hubs, the axial rotation angle of the mounting collars 3 and the main blade 1 can be adjusted, which can effectively balance the axial force and resist fluid impact and foreign object impact.
[0039] In some embodiments, as Figure 4 As shown, the main blade 1 is fixed to the mounting collar 3 by a connector (not shown in the figure), and the radial extension length of the main blade 1 is adjustable. Because the radial extension length of the main blade 1 is adjustable, the axial force can be effectively balanced, resisting fluid impact and foreign object impact.
[0040] Specifically, the radial extension length of the main blade 1 relative to the hub 2 can be determined according to the compressor inner diameter, working fluid properties, etc. The radial extension length of the main blade 1 can be adjusted by connecting parts such as threaded parts. At the same time, the back blade can be freely disassembled through the connection, which facilitates the inspection and maintenance of the main blade 1.
[0041] In some embodiments, the mounting collar 3 is provided with a radial limiting groove 31, one side of the main blade 1 is embedded in the radial limiting groove 31, and the other side of the main blade 1 extends axially out of the radial limiting groove 31. By providing a radial limiting groove, the main blade 1 can be more reliably fixed on the mounting collar 3.
[0042] Each mounting collar 3 may be provided with several radial limiting grooves 31, and the extension length of the main blade 1 can be adjusted by radial limiting grooves 31 of different depths.
[0043] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
[0044] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. A high mechanical strength blade structure for a centrifugal compressor, characterized in that, include: The main blade is a back blade and includes a leading edge tube, a trailing edge tube, a main beam, a support beam, and a skin, which are all independently manufactured. The main beam is snapped between the front edge tube and the rear edge tube to form an outer frame. The support beams are distributed within the outer frame to support the front edge tube, the main beam and the rear edge tube respectively. The skin covers the outer surface of the outer frame and at least covers the front edge tube.
2. The high mechanical strength blade structure of the centrifugal compressor according to claim 1, characterized in that, The leading edge tube includes a first leading edge tube and a second leading edge tube that are opposite each other, and the trailing edge tube includes a first trailing edge tube and a second trailing edge tube that are opposite each other. There are two main beams. The front ends of the first leading edge tube and the front ends of the second leading edge tube are connected. The front ends of the two main beams are respectively engaged with the rear ends of the first leading edge tube and the rear ends of the second leading edge tube. The rear ends of the two main beams are respectively engaged with the front ends of the first trailing edge tube and the front ends of the second trailing edge tube. The rear ends of the first trailing edge tube and the rear ends of the second trailing edge tube are connected.
3. The high mechanical strength blade structure of the centrifugal compressor according to claim 2, characterized in that, The front end of the first leading edge tube and the front end of the second leading edge tube are snapped together, or the first leading edge tube and the second leading edge tube are integrally formed; the rear end of the first trailing edge tube and the rear end of the second trailing edge tube are snapped together, or the first trailing edge tube and the second trailing edge tube are integrally formed.
4. The high mechanical strength blade structure of the centrifugal compressor according to claim 1, characterized in that, The leading edge tube, the trailing edge tube, the main beam, the supporting beam, and the skin are all fiber composite material components.
5. The high mechanical strength blade structure of the centrifugal compressor according to claim 4, characterized in that, The skin is composed of anisotropic layers of SW280F100a / 8522 glass cloth fiber layer, plain carbon cloth / 8522 fiber layer and N40J / 8522 fiber layer.
6. The high mechanical strength blade structure of the centrifugal compressor according to claim 4, characterized in that, The thickness of the skin is 1 to 2 mm.
7. The high mechanical strength blade structure of the centrifugal compressor according to any one of claims 1-6, characterized in that, It also includes a hub and a mounting ring, the mounting ring being mounted on the hub and capable of rotating relative to the hub within a predetermined rotation angle range, the number of main blades being the same as the number of mounting rings, and the main blades being fixed one-to-one on the mounting rings.
8. The high mechanical strength blade structure of the centrifugal compressor according to claim 7, characterized in that, It also includes miniature hubs, which are mounted on the hub and can rotate relative to the hub within a predetermined rotation angle range. The number of miniature hubs is the same as the number of mounting collars, and the mounting collars are fixed to the miniature hubs one by one.
9. The high mechanical strength blade structure of the centrifugal compressor according to claim 7, characterized in that, The main blade is fixed to the mounting collar by a connector, and the radial extension length of the main blade is adjustable.
10. The high mechanical strength blade structure of the centrifugal compressor according to claim 9, characterized in that, The mounting collar is provided with a radial limiting groove, one side of the main blade is embedded in the radial limiting groove, and the other side of the main blade extends axially out of the radial limiting groove.