Compressor blade root mounting structure, compressor, and mounting method

Abstract

The application provides a compressor blade root mounting structure, a compressor and a blade root mounting method. The mounting structure comprises a wheel disc, a first groove body is arranged on the wheel disc and is distributed along the axial direction of the wheel disc, a second groove body is distributed along the circumferential direction of the wheel disc, a locking structure comprises a first locking block and a second locking block, the first locking block is provided with a first notch along the circumferential direction of the wheel disc, the second locking block is provided with a protrusion on the side close to the first locking block, in the first state, the protrusion fills the first notch, the other side of the second locking block is flush with the side wall of the first groove body, in the second state, the first end surface of the protrusion is in contact with the second end surface of the first locking block, the sum of the sizes of the first locking block and the second locking block in the circumferential direction of the wheel disc is greater than the size of the second groove body, the other side of the second locking block is in contact with the first blade, and the axial movement of the first blade is limited. The mounting structure provided by the application realizes the locking of the blade after the blade is mounted by means of the displacement of the second locking block, and the integrity of the flow channel is ensured.

Description

Technical Field

[0001] This invention relates to the field of compressors, and more specifically, to a compressor blade root mounting structure, a compressor, and a mounting method. Background Technology

[0002] In heavy-duty gas turbines, the compressor blades are connected to the rotor disk via tenons and slots at the blade roots, transferring the loads acting on the blades to the rotor disk. The blade root-tenon connection structure has a sufficient strength safety margin, avoiding excessive stress concentration, reducing the impact on airflow within the turbine channel, and is simple in structure, facilitating processing, assembly, disassembly, and replacement. Therefore, the blade root-tenon connection structure is one of the most commonly used structural forms for axial compressors.

[0003] During installation, the blades and locking blocks are installed alternately. Before installing the last blade, the first locking block is slid into the mounting groove, then the last blade is installed in place, the second locking block is slid, and finally, the last blade is locked by bending the first and second locking blocks. This installation structure has the following problems:

[0004] ① Locking is achieved through bending and deformation, resulting in poor disassembly and reassembly capabilities and non-reusability;

[0005] ② An open chamber is left at the flow channel surface of the unlocked block, which affects the airflow in the flow channel and is detrimental to the aerodynamic performance of the compressor.

[0006] Patent CN116263170A proposes a compressor blade and impeller vibration damping and axial locking structure and its installation method. The structure includes an impeller and rotor blades mounted on the impeller. The rotor blades include a blade root. The impeller has a circumferential through groove and non-through grooves on both sides of the blade root. When the rotor blades are mounted on the impeller, the non-through grooves and the circumferential through grooves cooperate to form a locking groove. A vibration damping locking mechanism is provided in the locking groove. The vibration damping locking mechanism is designed between the blade root and the impeller rim. The damping structure formed by the vibration damping locking mechanism can establish dry friction damping to effectively reduce blade vibration and improve blade vibration performance.

[0007] Patent CN220378543U discloses an axial locking assembly for a blade root. The blade root is installed in a tenon groove, and the locking assembly axially limits the axial displacement of the blade root. The locking assembly includes a locking part, a first mounting part, and a second mounting part. The first mounting part is located on the blade root, and the second mounting part is located in the tenon groove. The locking part includes an elastic body and a locking body. The elastic body and the locking body are in contact with each other on their upper surfaces in the axial direction and provide an axial force to the locking body. The locking part has: a pre-installation state, in which the elastic body and the locking body are accommodated in the second mounting part; an operation state, in which the elastic body can be compressed to operate the locking body to rotate; and a locking state, in which the locking body can be partially rotated into the first mounting part, and the locking body limits the axial displacement of the blade root.

[0008] The locking structure proposed in the prior art cannot simultaneously achieve both locking strength and ease of disassembly and assembly, and it also has flow channel cavities that affect the airflow of the compressor.

[0009] In view of the above technical problems, this invention is hereby introduced. Summary of the Invention

[0010] The main objective of this invention is to provide a compressor blade root mounting structure, a compressor, and an installation method that replaces the bending locking structure, enabling damage-free disassembly and assembly while ensuring the integrity of the flow channel.

[0011] To achieve the above objectives, the present invention provides a compressor blade root mounting structure, including a disc, on which a first groove and a second groove are formed. The first groove is distributed along the axial direction of the disc and is used to accommodate the blade, while the second groove is distributed circumferentially along the disc and is used to accommodate a locking structure.

[0012] The locking structure is characterized by comprising a first locking block and a second locking block, wherein the first locking block has a first notch along the circumferential direction of the wheel, and the second locking block has a protrusion on the side near the first locking block.

[0013] In the first state, the protrusion fills the first notch, and the other side of the second locking block is flush with the side wall of the first groove. In the second state, the first end face of the protrusion contacts the second end face of the first locking block. The sum of the dimensions of the first locking block and the second locking block is greater than the dimension of the second groove when the disc ring is upward. The other side of the second locking block contacts the first blade, restricting the axial movement of the first blade.

[0014] Preferably, the first blade has a second notch, and in the second state, the second locking block at least partially enters the second notch.

[0015] Preferably, the locking structure further includes an elastic component, one end of which is in contact with the second locking block, and the other end of which is inserted into the bottom of the second groove.

[0016] Preferably, the elastic component includes a spring and a pin, with the spring sleeved on the pin.

[0017] Preferably, the second locking block has a groove near the elastic component.

[0018] Preferably, the second groove is a dovetail groove or a T-shaped groove, and the dimension of the second locking block in the radial direction of the wheel is smaller than the depth of the second groove.

[0019] Preferably, the end face of the first locking block that is opposite to the first end face contacts the side face of the second blade, and the second blade is distributed adjacent to the first blade.

[0020] Preferably, in the second state, the top surfaces of the first locking block and the second locking block are flush with the flow channel surface of the wheel.

[0021] Preferably, the depth of the first notch along the circumference of the wheel is less than the depth of the second notch along the circumference of the wheel.

[0022] The compressor axial blade root mounting structure proposed in this application achieves the following effects:

[0023] ① The first locking block of this application is used in conjunction with the second locking block. By means of the displacement of the second locking block, the blade is locked after it is installed.

[0024] ②The tops of the first and second locking blocks are flush with the top of the wheel, thus avoiding the influence of the open cavity on the airflow of the compressor;

[0025] ③ Set up an elastic component. In the second state, the elastic component is in a compressed state to ensure that the second locking block is flush with the flow channel of the wheel under the action of elasticity.

[0026] ④ The installation structure of this application is simple, and the disassembly and installation processes are reversed, so that the disassembly and assembly of the locking structure can be achieved without damaging the locking structure.

[0027] Another aspect of this application proposes a compressor, including multiple sets of locking structures, which employ the aforementioned compressor blade root mounting structure to axially fix each blade.

[0028] The compressor proposed in this application achieves the following effects:

[0029] ① The compressor uses a multi-locking structure that uses a first locking block in conjunction with a second locking block. By shifting the second locking block, the blades are locked after installation.

[0030] ②The tops of the first and second locking blocks in the multi-locking structure of the compressor are flush with the top of the wheel disc, which avoids the influence of the open cavity on the airflow of the compressor;

[0031] ③ The compressor uses a multi-set locking structure with elastic components. In the second state, the elastic components are in a compressed state, ensuring that the second locking block is flush with the flow channel of the wheel under the action of elasticity.

[0032] ④ The compressor uses a multi-set locking structure that is easy to install. The removal and installation processes are reversed, allowing the locking structure to be disassembled and assembled without damaging it.

[0033] Another aspect of this application proposes a method for installing the axial blade root of a compressor, comprising the following steps:

[0034] Step S1: Slide the first locking block into the second groove.

[0035] Step S2: Slide the second locking block into the second groove, press down the second locking block, and make the protrusion enter the first notch.

[0036] Step S3: Slide the first blade into the first groove.

[0037] Step S4: Move the second locking block away from the first locking block, so that the protruding first end face contacts the second end face of the first locking block, and the other side of the second locking block contacts the second notch on the first blade.

[0038] Preferably, the locking structure further includes an elastic component, which is inserted into the bottom of the second groove between steps S1 and S2.

[0039] The compressor axial blade root installation method proposed in this invention achieves the following technical effects:

[0040] ①The blades are locked after installation by means of the displacement of the second locking block;

[0041] ②In the second installation state, the tops of the first and second locking blocks are flush with the top of the wheel disc, thus avoiding the influence of the open cavity on the airflow of the compressor;

[0042] ③ The locking structure is equipped with an elastic component. In the second state, the elastic component is in a compressed state, ensuring that the second locking block is flush with the flow channel of the wheel under the action of elasticity;

[0043] ④ The dismantling and installation processes are reversed, allowing the locking structure to be dismantled and assembled without damaging it. Attached Figure Description

[0044] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0045] Figure 1 This illustration shows a schematic diagram of a wheel structure in one embodiment of this application;

[0046] Figure 2 A schematic diagram of the structure of the first locking block in one embodiment of this application is shown;

[0047] Figure 3 A perspective view of the second locking block in one embodiment of this application is shown;

[0048] Figure 4 A schematic diagram of the second locking block groove portion is shown in one embodiment of this application;

[0049] Figure 5 A schematic diagram of the first blade structure in one embodiment of this application is shown;

[0050] Figure 6 A schematic diagram of the blade and mounting structure in one embodiment of this application is shown;

[0051] Figure 7 A schematic cross-sectional view of the installation structure in one embodiment of this application is shown;

[0052] Figure 8 A flowchart of an installation method according to one embodiment of this application is shown.

[0053] The above figures include the following reference numerals:

[0054] 100. Wheel; 120. First groove; 140. Second groove;

[0055] 340, Locking structure; 300, First locking block; 400, Second locking block; 320, First notch; 420, Protrusion; 440, Slide groove; 421, First end face; 321, Second end face;

[0056] 220. First blade; 222. Second notch; 240. Second blade;

[0057] 500, Elastic component; 520, Spring; 540, Pin. Detailed Implementation

[0058] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0059] The present invention will be further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention. The term "comprising" indicates the presence of a feature, but does not exclude the presence or addition of one or more other features. The terms "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of description, and 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 of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0061] Example 1:

[0062] This application proposes a compressor blade root mounting structure, such as Figure 1 and Figure 6 As shown, the mounting structure includes a disk 100, on which a first groove 120 and a second groove 140 are formed. The first groove 120 is distributed along the axial direction of the disk 100 and is used to accommodate the blades. The second groove 140 is distributed circumferentially along the disk 100 and is used to accommodate the locking structure 340. The locking structure 340 is correspondingly arranged with the blades, and the locking structure 340 restricts the axial movement of the blades along the compressor.

[0063] The locking structure 340 includes a first locking block 300 and a second locking block 400, wherein the second locking block 400 is used to lock into contact with the first blade, and the first locking block 300 is used to lock into contact with the second blade adjacent to the first blade.

[0064] like Figure 2 As shown, the first locking block 300 and the first locking block 300 are provided with a first notch 320 along the circumference of the wheel 100, such as Figure 3 As shown, the second locking block 400 has a protrusion 420 on the side near the first locking block 300. In the first state, the protrusion 420 fills the first notch 320, and the other side of the second locking block 400 is flush with the side wall of the first groove 120. At this time, both the first locking block 300 and the second locking block 400 are located inside the second groove on the wheel, which facilitates the feeding of the first blade into the first groove adjacent to the second locking block 400.

[0065] In the second state, the first end face 421 of the protrusion 420 contacts the second end face 321 of the first locking block 300. The sum of the dimensions of the first locking block 300 and the second locking block 400 is greater than the dimension of the second groove 140. Thus, the second locking block 400 partially enters the first groove where the first blade is located, contacting the first blade 220 and restricting its axial movement. The end faces of the first locking block 300 that are opposite to the first end face 421 contact the side surface of the second blade 240.

[0066] Each blade in the compressor is provided with a first locking block and a second locking block on both sides. The first locking block and the second locking block together fix the blade and restrict the axial movement of the blade.

[0067] To achieve the locking of the second locking block 400 with the first blade, as shown in the attached diagram. Figure 5 As shown, a second notch 222 is provided on the first blade near the second locking block, and the second notch 222 matches the end structure of the first locking block 300. This application does not specifically limit the shape of the second notch 222, as long as it can ensure that the second locking block 400 at least partially enters the second notch 222.

[0068] Preferably, the depth of the first notch 320 along the circumference of the wheel 100 is less than the depth of the second notch 222 along the circumference of the wheel 100. This ensures that after the first blade is installed, the second locking block can switch from the first state to the second state and enter the second notch 222.

[0069] In one embodiment of this application, the locking structure 340 further includes an elastic component 500, one end of which is in contact with the second locking block 400, and the other end is inserted into the bottom of the second groove 140. Specifically, as shown in the attached... Figure 7 As shown, the elastic component 500 includes a spring 520 and a pin 540. The spring 520 is sleeved on the pin 540 and inserted into a hole at the bottom of the second groove 140. This application does not specify the dimensions of the spring and the pin, but it should ensure that the second locking block can enter the second groove 140 when there is no downward pressure.

[0070] Under the elastic force of the elastic component 500, the second locking block can freely enter and exit the first notch 320, and ensures that the top of the second locking block is flush with the top of the wheel in the second state, ensuring airflow smoothness. It should be noted that in the second state, the elastic component 500 is in a compressed state, providing support for the second locking block 400 and ensuring the smoothness of the flow channel. When the compressor is operating, the second locking block is subjected to centrifugal force, reducing the force on the pin 540.

[0071] Additionally, as attached Figure 4 As shown, in this application, the second locking block 400 is provided with a groove 440 near the elastic component 500. When the second locking block 400 is moved, the elastic component 500 is confined within the groove 440 to ensure the stability of the force.

[0072] In addition, the second groove 140 is a dovetail groove or a T-shaped groove, and the dimension of the second locking block 400 in the radial direction of the wheel 100 is smaller than the depth of the second groove 140, thus enabling the second locking block to switch between the first state and the second state.

[0073] The compressor blade root mounting structure proposed in this application achieves the following technical effects:

[0074] ① The first locking block of this application is used in conjunction with the second locking block. By means of the displacement of the second locking block, the blade is locked after it is installed.

[0075] ②The tops of the first and second locking blocks are flush with the top of the wheel, thus avoiding the influence of the open cavity on the airflow of the compressor;

[0076] ③ Set up an elastic component. In the second state, the elastic component is in a compressed state to ensure that the second locking block is flush with the flow channel of the wheel under the action of elasticity.

[0077] ④ The installation structure of this application is simple, and the disassembly and installation processes are reversed, so that the disassembly and assembly of the locking structure can be achieved without damaging the locking structure.

[0078] Another aspect of this application proposes a compressor comprising multiple locking structures for axially fixing each blade. The fixing and disassembly of each blade are relatively independent.

[0079] The compressor proposed in this application achieves the following technical effects:

[0080] ① The compressor uses a multi-locking structure that uses a first locking block in conjunction with a second locking block. By shifting the second locking block, the blades are locked after installation.

[0081] ②The tops of the first and second locking blocks in the multi-locking structure of the compressor are flush with the top of the wheel disc, which avoids the influence of the open cavity on the airflow of the compressor;

[0082] ③ The compressor uses a multi-set locking structure with elastic components. In the second state, the elastic components are in a compressed state, ensuring that the second locking block is flush with the flow channel of the wheel under the action of elasticity.

[0083] ④ The compressor uses a multi-set locking structure that is easy to install. The removal and installation processes are reversed, allowing the locking structure to be disassembled and assembled without damaging it.

[0084] In addition, this application also proposes a method for installing the axial blade root of a compressor, such as... Figure 8 As shown, the specific steps include:

[0085] Step S1: Slide the first locking block 300 into the second groove 140;

[0086] Step S2: Slide the second locking block 400 into the second groove 140, press down the second locking block 400, and make the protrusion 420 enter the first notch 320;

[0087] Step S3: Slide the first blade 220 into the first groove 120 to complete the installation of the first blade;

[0088] In step S4, the second locking block 400 is moved away from the first locking block 300, and the first end face 421 of the protrusion 420 contacts the second end face 321 of the first locking block 300. The other side of the second locking block 400 contacts the second notch 222 on the first blade 220, thus fixing one side of the first blade. At this time, the end faces of the first locking block 300 opposite to the first end face 421 contact the side of the second blade 240, thereby achieving unilateral fixing of two adjacent blades by a set of locking structures.

[0089] Preferably, the locking structure further includes an elastic component 500. Between steps S1 and S2, the elastic component 500 is inserted into the bottom of the second groove 140. When switching from the first state to the second state, the top of the second locking block is flush with the flow channel of the wheel by means of the force of the elastic component.

[0090] In summary, the compressor axial blade root installation method proposed in this embodiment achieves the following technical effects:

[0091] ①The blades are locked after installation by means of the displacement of the second locking block;

[0092] ②In the second installation state, the tops of the first and second locking blocks are flush with the top of the wheel disc, thus avoiding the influence of the open cavity on the airflow of the compressor;

[0093] ③ The locking structure is equipped with an elastic component. In the second state, the elastic component is in a compressed state, ensuring that the second locking block is flush with the flow channel of the wheel under the action of elasticity;

[0094] ④ The dismantling and installation processes are reversed, allowing the locking structure to be dismantled and assembled without damaging it.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A compressor blade root mounting structure, comprising a wheel (100), wherein a first groove (120) and a second groove (140) are formed on the wheel (100), the first groove (120) being distributed axially along the wheel (100) for accommodating blades, and the second groove (140) being distributed circumferentially along the wheel (100) for accommodating a locking structure (340). Its features are, The locking structure includes a first locking block (300) and a second locking block (400). The first locking block (300) has a first notch (320) along the circumference of the wheel (100), and the second locking block (400) has a protrusion (420) on the side near the first locking block (300). In the first state, the protrusion (420) fills the first notch (320), and the other side of the second locking block (400) is flush with the side wall of the first groove (120). In the second state, the first end face (421) of the protrusion (420) contacts the second end face (321) of the first locking block (300). The sum of the dimensions of the first locking block (300) and the second locking block (400) on the circumferential direction of the wheel (100) is greater than the dimension of the second groove (140). The other side of the second locking block (400) contacts the first blade (220), restricting the axial movement of the first blade (220). The locking structure also includes an elastic component (500), one end of which is in contact with the second locking block (400), and the other end is inserted into the bottom of the second groove (140); The second locking block (400) is provided with a groove (440) near the elastic component (500); In the second state, the elastic component (500) is in a compressed state.

2. The compressor blade root mounting structure according to claim 1, characterized in that, The first blade (220) is provided with a second notch (222), and in the second state, the second locking block (400) is at least partially inserted into the second notch (222).

3. The compressor blade root mounting structure according to claim 1, characterized in that, The elastic component (500) includes a spring (520) and a pin (540), the spring (520) being sleeved on the pin (540).

4. The compressor blade root mounting structure according to claim 1 or 2, characterized in that, The second groove (140) is a dovetail groove or a T-shaped groove, and the second locking block (400) has a dimension in the radial direction of the wheel (100) that is smaller than the depth of the second groove (140).

5. The compressor blade root mounting structure according to claim 1 or 2, characterized in that, The end face of the first locking block (300) that is opposite to the first end face (421) contacts the side of the second blade (240), and the second blade (240) is distributed adjacent to the first blade (220).

6. The compressor blade root mounting structure according to claim 1 or 2, characterized in that, In the second state, the top surfaces of the first locking block (300) and the second locking block (400) are flush with the flow channel surface of the wheel (100).

7. The compressor blade root mounting structure according to claim 2, characterized in that, The depth of the first notch (320) along the circumference of the wheel (100) is less than the depth of the second notch (222) along the circumference of the wheel (100).

8. A compressor, characterized in that, It includes multiple sets of the locking structures described above, and uses the compressor blade root mounting structure as described in any one of claims 1-7 to axially fix each blade.

9. A method for axial blade root installation of a compressor, employing the blade root installation structure described in any one of claims 1-7, characterized in that, Includes the following steps: Step S1: Slide the first locking block (300) into the second groove (140). Step S2: Slide the second locking block (400) into the second groove (140) and press down the second locking block (400) so that the protrusion (420) enters the first notch (320). Step S3: Slide the first blade (220) into the first groove (120). In step S4, the second locking block (400) is moved away from the first locking block (300), and the first end face (421) of the protrusion (420) contacts the second end face (321) of the first locking block (300), and the other side of the second locking block (400) contacts the second notch (222) on the first blade (220).

10. The compressor axial blade root installation method according to claim 9, characterized in that, The locking structure also includes an elastic component (500), which is inserted into the bottom of the second groove (140) between steps S1 and S2.

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