Wheel disk structure, variable diameter wheel disk system and balancing disk axial force adjusting method

Abstract

Provided are a wheel disc structure and a variable-diameter wheel disc system. The wheel disc structure comprises a fixed section wheel disc and an adjustable section wheel disc. The radial length of the fixed section wheel disc is constant, and the radial length of the adjustable section wheel disc is set to be adjustable. An axial force adjustment method for a balance disc is also provided. The balance disc is divided into a fixed section wheel disc and an adjustable section wheel disc, and the radial length of the adjustable section wheel disc is set to be adjustable to change the force receiving area of the balance disc. The wheel disc structure utilizes the relationship between the force generated by the pressure difference and the force receiving area of the wheel disc, and utilizes the diameter change of the adjustable section wheel disc to change the area of the wheel disc, so that the axial force borne by the wheel disc can be adjusted according to the working condition, and the flexibility is better.

Description

Technical Field

[0001] This invention relates to the field of aero engines, and more specifically to the field of compressor discs. Background Technology

[0002] A balance disk structure is often required in compressors. The balance disk is a device used in multi-stage axial compressors to balance axial forces. It is installed behind the last stage impeller of the multi-stage axial compressor.

[0003] The pressure on one side of the balance disc is approximately equal to the gas pressure in the gap between the last-stage impeller discs, which is a relatively high-pressure gas; the other side is usually connected to the intake chamber of the seventh stage, where the pressure is the intake pressure, which is a relatively low-pressure gas. The pressure difference between the two sides causes the rotor to be subjected to a force opposite to the axial force.

[0004] In compressor test pieces or engine operation, to prevent the compressor rotor from shifting back and forth during operation, the balance disc only balances a portion of the axial force, with the remaining axial force borne by the thrust bearing. However, in actual operation, the axial force on the balance disc changes continuously with the operating conditions of the compressor or engine. During this process, a mismatch in the magnitude of the axial forces between the balance disc and the thrust bearing can easily occur. If the axial force on the balance disc is too large, the rotor position will shift excessively, affecting test safety; if the axial force on the balance disc is too small, the axial force on the thrust bearing will be too large, affecting the thrust bearing's lifespan. Summary of the Invention

[0005] One object of the present invention is to provide a wheel structure that can adjust the axial force borne by the flat wheel as needed.

[0006] To achieve the above objectives, the wheel structure includes a fixed-section wheel and an adjustable-section wheel. The radial length of the fixed-section wheel remains constant, while the radial length of the adjustable-section wheel is set to be adjustable.

[0007] In one or more embodiments, the adjustable section wheel is located radially outside the fixed section wheel.

[0008] In one or more embodiments, the adjustable section wheel includes a linkage ring assembly and a multi-link assembly. The multi-link assembly includes a first part link and a second part link. The second part link includes a plurality of circumferentially fitted links. The plurality of links together form an adjustable section wheel surface. The linkage ring assembly is connected to the multi-link assembly and is used to drive the second part link to rise and fall by means of its own rotation, so as to adjust the radial length of the adjustable section wheel surface.

[0009] In one or more embodiments, one end of the first connecting rod is connected to the fixed section wheel, and the other end is connected to the second connecting rod. One end of the second connecting rod is connected to the linkage ring assembly, and the other end is engaged with the rectifier through a sliding sealing structure.

[0010] In one or more embodiments, the sliding sealing structure includes a sealing groove disposed on the rectifier and a toothed structure disposed on the second connecting rod, the toothed structure being located on both axial sides of the second connecting rod and slidably engaging with the sealing groove, the sealing groove allowing the second connecting rod to move radially.

[0011] In one or more embodiments, the first part of the connecting rod and the second part of the connecting rod are connected by a spherical bearing.

[0012] In one or more embodiments, the linkage assembly includes a linkage ring and a rolling element, the rolling element being located in a groove on the linkage ring and connected to the linkage ring by a pin, so that the rolling element can rotate around the pin, and the rolling element is also connected to the second part of the connecting rod by a spherical bearing.

[0013] In one or more embodiments, the second connecting rod includes an I-shaped cross-section connecting rod and a cross-shaped cross-section connecting rod, which are staggered with each other.

[0014] In one or more embodiments, both the I-shaped cross-section connecting rod and the cross-shaped cross-section connecting rod are connected to the linkage ring.

[0015] In one or more embodiments, both the I-shaped cross-section connecting rod and the cross-shaped cross-section connecting rod are connected to the first part of the connecting rod via spherical bearings.

[0016] In one or more embodiments, the wheel is a balance wheel.

[0017] In one or more embodiments, the adjustable section wheel is fitted with the middle section of the final stage rectifier using a sliding sealing structure.

[0018] In one or more embodiments, the adjustable section wheel has an extension range of 0-30 mm and a reduction range of 0-20 mm.

[0019] Another object of the present invention is to provide a variable diameter wheel system, the system including the above-described wheel structure, the wheel structure including a linkage ring assembly and a multi-link assembly, and the system further including a power drive assembly electrically connected to the linkage ring assembly.

[0020] In one or more embodiments, the system further includes a control unit that is signal-connected to the power drive assembly.

[0021] Another object of the present invention is to provide a compressor including the above-described variable diameter disc system.

[0022] Another objective of this invention is to provide a method for adjusting the axial force of a balance disc, wherein the balance disc is divided into a fixed section disc and an adjustable section disc, and the radial length of the adjustable section disc is set to be adjustable to change the force-bearing area of ​​the balance disc.

[0023] The aforementioned wheel structure utilizes the relationship between the magnitude of the force generated by the pressure difference and the force-bearing area of ​​the balance disc. By changing the diameter of the adjustable wheel, the surface area of ​​the disc can be altered, thereby allowing the axial force borne by the wheel to be adjusted according to the working conditions, thus providing better flexibility. Attached Figure Description

[0024] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0025] Figure 1 This is a diagram showing the installation location of the balance disc;

[0026] Figure 2 This is a schematic diagram of the structure of a traditional balance disc;

[0027] Figure 3 This is a schematic diagram of the linkage assembly and the multi-link assembly;

[0028] Figure 4 This is a schematic diagram showing the movement position of the linkage assembly and the second connecting rod.

[0029] Figure 5 This is a schematic diagram of the cross-sections of staggered I-shaped and cross-shaped connecting rods. Detailed Implementation

[0030] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0031] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0032] A compressor consists of a series of alternating stator-rotor arrangements that compress the gas flowing inside. The balance disk, located behind the last stage impeller of a multi-stage axial compressor, is used to balance axial forces.

[0033] Figure 1The diagram shows the final stage rotor 1, final stage rectifier 2, pre-combustion chamber diffuser 3, rotor disc 4, drum 5, front cavity of the grate disc 6, balance disc 7, rear cavity of the grate disc 8, chamber 9, bolt 10, combustion chamber 11, front section of the final stage rectifier 12, middle section of the final stage rectifier 13, rear section of the final stage rectifier 14, and honeycomb sealing structure 15. The front section of the final stage rectifier 12, middle section of the final stage rectifier 13, and rear section of the final stage rectifier 14 are sequentially fixed by welding. Figure 1 As shown, the left side of the balance disc 7 is the high-pressure zone A, such as the area 6 in the front cavity of the toothed disc, and the right side is the low-pressure zone B, such as the area 8 in the rear cavity of the toothed disc. A pressure difference is generated between the two sides. Specifically, as... Figure 2 As shown, on one side of the balance disc 7, such as the area in front of the toothed disc 6, the pressure is approximately equal to the gas pressure in the gap between the last-stage impeller discs. This gas is high-pressure gas. On the other side of the balance disc 7, such as the area in rear of the toothed disc 8, it is usually connected to the inlet chamber for the interstage bleed air of the high-pressure compressor, and the pressure there is lower than the gas pressure at the outlet of the last-stage impeller. This pressure difference causes the rotor to experience a force opposite to the axial force, the magnitude of which depends on the force-bearing area of ​​the balance disc. Therefore, a balance disc structure is required in the compressor structural design to balance the axial force.

[0034] Typically, the outer edge of the balance disc 7 is also equipped with a honeycomb sealing structure 15 to maintain the pressure difference of the disc.

[0035] However, during compressor test specimens or engine operation, to prevent the compressor rotor from shifting back and forth during operation, the balance disc only balances a portion of the axial force, with the remaining axial force borne by the thrust bearing. Because the axial force on the balance disc constantly changes with the operating conditions of the compressor or engine during actual operation, a mismatch in the magnitude of the axial forces between the balance disc and the thrust bearing can easily occur. If the axial force on the balance disc is too large, the rotor position will shift excessively, affecting test safety; if the axial force on the balance disc is too small, the axial force on the thrust bearing will be too large, affecting the thrust bearing's lifespan.

[0036] Based on this, the present disclosure provides a roulette structure, such as Figure 3 and Figure 4 As shown, the wheel includes a fixed section wheel 100 and an adjustable section wheel 200. The radial length of the fixed section wheel remains unchanged, while the radial length of the adjustable section wheel is set to be adjustable so that the diameter of the balance wheel can be adjusted according to the actual situation to adapt to changes in different working conditions.

[0037] The adjustable section disc 200 is located radially outside the fixed section disc 100 and includes a linkage ring assembly 210 and a multi-link assembly 220. The linkage ring assembly 210 is connected to the multi-link assembly 220 and is used to drive the second part of the linkage to lift and lower by means of its own rotation, so as to adjust the radial length of the adjustable section disc.

[0038] Specifically, the multi-link assembly 220 includes a first link 221 and a second link 222. The second link 222 includes multiple circumferentially fitted links, such as... Figure 5 The diagram shows a top-view cross-section. Viewed along the axial direction, multiple connecting rods together form the adjustable section disc.

[0039] In some embodiments, the second connecting rod forming the adjustable section disc includes an I-shaped cross-section connecting rod 24 and a cross-shaped cross-section connecting rod 25, which are staggered to ensure a sealing effect at the connecting rod.

[0040] One end of the first connecting rod 221 is connected to the fixed section wheel 100, such as at the multi-link support point on one side of the center of the balance disc, and the other end is connected to the second connecting rod 222. Preferably, it is connected to both the I-shaped cross-section connecting rod 24 and the cross-shaped cross-section connecting rod 25 through a spherical bearing H.

[0041] One end of the second connecting rod 222 is connected to the linkage ring assembly 210. Preferably, it is connected to both the I-shaped cross-section connecting rod 24 and the cross-shaped cross-section connecting rod 25 via a spherical bearing H'. The other end of the second connecting rod 222 is engaged with the rectifier via a sliding sealing structure 150.

[0042] like Figure 3 As shown, the sliding sealing structure 150 includes a sealing groove 151 disposed on the rectifier and a toothed structure 152 disposed on the second connecting rod. The toothed structure 152 is located on both axial sides of the second connecting rod 222 and slidably engages with the sealing groove 151. The sealing groove 151 allows the second connecting rod 222 to move along... Figure 3 The vertical movement is shown. The sliding sealing structure 150 adopts a sliding grate sealing structure arranged in the axial and horizontal directions, which can adapt to changes in the diameter of the balance disc and enhance the sealing effect.

[0043] Continue to refer to Figure 3 and Figure 4 As shown, the linkage ring assembly 210 includes a linkage ring 216 and rolling elements 217. Multiple rolling elements 217 are located in circumferentially distributed grooves 218 on the linkage ring 216 and are connected to the linkage ring 216 by pins so that the rolling elements 217 can rotate around the pins. The rolling elements 217 are also connected to the second part of the connecting rod 222 by spherical bearings.

[0044] For example, the rolling element 217 is a ball, and the second connecting rod 222 includes a radial connecting rod 28 and an axial connecting rod 27. The axial connecting rod 27 is spherically engaged with the ball, and the end of the radial connecting rod 28 is provided with a toothed structure 152.

[0045] The linkage ring 216 rotates clockwise or counterclockwise, causing the rolling element to rotate, which in turn causes the end of the second connecting rod 222 to move along the arc G, raising or lowering the second connecting rod 222, and then driving the grate sealing structure to move up and down, so as to realize the adjustable diameter of the wheel and thus change the force-bearing area of ​​the wheel.

[0046] It is understood that the aforementioned wheel is not limited to a balancing disc. When the aforementioned wheel is a balancing disc, the adjustable section wheel and the middle section 13 of the final stage rectifier are fitted with a sliding sealing structure.

[0047] With the above-mentioned wheel structure, the diameter of the wheel can be adjusted according to the actual situation, and the corresponding force-bearing area of ​​the wheel surface also changes accordingly, so the axial force borne by the wheel surface can be adjusted as needed.

[0048] Considering the relationship between the balance disc and other components, in some embodiments, the balance disc has an elongation range of 0-30mm and a shrinkage range of 0-20mm.

[0049] Based on the description of the aforementioned wheel structure, a variable diameter wheel system and a compressor including this system can also be understood. This variable diameter wheel system includes the aforementioned wheel structure and a power drive assembly electrically connected to the linkage ring assembly. In some embodiments, it also includes a control unit, which is signal-connected to the power drive assembly. Thus, after sensing the actual operating conditions of the compressor or engine, the control unit controls the power drive assembly to adjust the rotation of the linkage ring assembly, ensuring that the axial force on the balance disc adapts in real time to changes in the operating conditions of the compressor or engine.

[0050] For example, when the thrust bearing is subjected to excessive force, the diameter adjustment device lengthens the diameter of the wheel to increase the force-bearing area of ​​the balance disc, thereby increasing the axial force on the balance disc. Conversely, when the thrust bearing is subjected to insufficient force, the diameter adjustment device shortens the diameter of the wheel to reduce the force-bearing area of ​​the balance disc, thereby reducing the axial force on the balance disc. Thus, the axial force on the balance disc can be adjusted in real time.

[0051] Based on the above description of the wheel structure, we can also understand a method for adjusting the axial force of the balance disc. This method divides the balance disc into a fixed section and an adjustable section, and sets the radial length of the adjustable section to be adjustable to change the force-bearing area of ​​the balance disc, thereby allowing the axial force borne by the balance disc to adapt to the changes in the operating conditions of the compressor or engine in real time.

[0052] It should be noted that the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0053] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0054] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0055] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A wheel structure, characterized in that, It includes a fixed section wheel and an adjustable section wheel, wherein the radial length of the fixed section wheel remains constant, and the radial length of the adjustable section wheel is set to be adjustable.

2. The wheel structure as described in claim 1, characterized in that, The adjustable section wheel is located radially outside the fixed section wheel.

3. The wheel structure as described in claim 1, characterized in that, The adjustable section wheel includes a linkage ring assembly and a multi-link assembly. The multi-link assembly includes a first part of the linkage and a second part of the linkage. The second part of the linkage includes multiple circumferentially fitted linkages, and the multiple linkages together form the adjustable section wheel surface. The linkage ring assembly is connected to the multi-link assembly and is used to drive the second part of the linkage to rise and fall by means of its own rotation, so as to adjust the radial length of the adjustable section plate.

4. The wheel structure as described in claim 3, characterized in that, One end of the first connecting rod is connected to the fixed section wheel, and the other end is connected to the second connecting rod. One end of the second connecting rod is connected to the linkage ring assembly, and the other end is engaged with the rectifier through a sliding sealing structure.

5. The wheel structure as described in claim 4, characterized in that, The sliding sealing structure includes a sealing groove disposed on the rectifier and a toothed structure disposed on the second connecting rod. The toothed structure is located on both axial sides of the second connecting rod and slidably engages with the sealing groove. The sealing groove allows the second connecting rod to move radially.

6. The wheel structure as described in claim 4, characterized in that, The first part of the connecting rod is connected to the second part of the connecting rod via a spherical bearing.

7. The wheel structure as described in claim 3, characterized in that, The linkage ring assembly includes a linkage ring and a rolling element. The rolling element is located in a groove on the linkage ring and is connected to the linkage ring by a pin, so that the rolling element can rotate around the pin. The rolling element is also connected to the second part of the connecting rod by a spherical bearing.

8. The wheel structure as described in claim 3, characterized in that, The second part of the connecting rod includes an I-shaped cross-section connecting rod and a cross-shaped cross-section connecting rod, which are arranged alternately.

9. The wheel structure as described in claim 8, characterized in that, Both the I-shaped cross-section connecting rod and the cross-shaped cross-section connecting rod are connected to the linkage ring.

10. The wheel structure as described in claim 8, characterized in that, Both the I-shaped cross-section connecting rod and the cross-shaped cross-section connecting rod are connected to the first part of the connecting rod via spherical bearings.

11. The wheel structure according to any one of claims 1-10, characterized in that, The wheel is a balance wheel.

12. The wheel structure as described in claim 11, characterized in that, The adjustable section wheel and the middle section of the final stage rectifier are fitted with a sliding sealing structure.

13. The wheel structure as described in claim 1, characterized in that, The adjustable section wheel has an extension range of 0-30mm and a reduction range of 0-20mm.

14. A variable diameter wheel system, characterized in that, The system includes a wheel structure as described in any one of claims 1-13, the wheel structure comprising a linkage assembly and a multi-link assembly, and the system further comprising a power drive assembly electrically connected to the linkage assembly.

15. The variable diameter wheel system as described in claim 14, characterized in that, The system also includes a control unit that is signal-connected to the power drive assembly.

16. A compressor, characterized in that, Including the variable diameter wheel system as described in any one of claims 14-15.

17. A method for adjusting the axial force of a balance disc, characterized in that, Includes the following steps: The balance disc is divided into a fixed section and an adjustable section, and the radial length of the adjustable section is set to be adjustable to change the force-bearing area of ​​the balance disc.

Images