Compressor blade root mounting structure, compressor and mounting method

Abstract

The invention provides a gas compressor blade root mounting structure, a gas compressor and a blade root mounting method.The mounting structure comprises a wheel disc, first groove bodies are formed in the wheel disc and distributed in the axial direction of the wheel disc, second groove bodies are distributed in the annular direction of the wheel disc, a locking structure comprises a first locking block and a second locking block, and the first locking block is provided with a first notch in the annular direction of the wheel disc; a protrusion is arranged on the side, close to the first locking block, of the second locking block, in the first state, the first notch is filled with the protrusion, the other side of the second locking block is flush with the side wall of the first groove body, and in the second state, the first end face of the protrusion makes contact with the second end face of the first locking block. The sum of the sizes of the first locking block and the second locking block in the annular direction of the wheel disc is larger than the size of the second groove body, the other side of the second locking block makes contact with the first blade, and axial movement of the first blade is limited. According to the mounting structure, by means of displacement of the second locking block, locking of the blades is achieved after the blades are mounted, and the integrity of the flow channel is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and in particular to a compressor blade root mounting structure, a compressor and an mounting method. Background Art

[0002] When a heavy-duty gas turbine is working, the compressor blades are connected to the tongue and groove of the outer edge of the disk through the blade root, which plays a role in transferring the load acting on the blade to the disk. The blade root-tongue and groove connection structure has a sufficient strength safety reserve factor to avoid excessive stress concentration and reduce the impact on the airflow in the channel. It is also simple in structure and easy to process, assemble, disassemble and replace. Therefore, the blade root-tongue and groove connection structure is one of the most commonly used structural forms of axial flow compressors.

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

[0004] ① Locking is achieved by bending and deformation, poor disassembly and assembly, and cannot be reused;

[0005] ② An open cavity is left on the flow channel surface of the final locking 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 wheel vibration reduction and axial locking structure and an installation method thereof, including a wheel and a rotor blade arranged on the wheel, the rotor blade including a blade root, a circumferential through groove being arranged on the wheel disk, and non-through grooves being arranged on both sides of the blade root. When the rotor blade is installed on the wheel disk, the non-through groove cooperates with the circumferential through groove to form a locking groove, and a vibration-reducing locking mechanism is arranged in the locking groove. A vibration-reducing locking mechanism is designed between the blade root and the wheel rim. The damping structure formed by the vibration-reducing locking mechanism can establish dry friction damping to effectively reduce blade vibration and improve blade vibration performance.

[0007] Patent CN220378543U proposes a blade root axial locking assembly, in which the blade root is installed in the tenon groove, and the locking assembly axially limits the displacement of the blade root in the axial direction. The locking assembly includes a locking portion, a first mounting portion, and a second mounting portion. The first mounting portion is arranged on the blade root, and the second mounting portion is arranged in the tenon groove. The locking portion includes an elastomer and a locking body. The elastomer and the locking body are in contact with each other in the axial direction and provide an axial force to the locking body. The locking portion has: a pre-installation state, in which the elastomer and the locking body are accommodated in the second mounting portion; an operating state, in which the elastomer can be compressed to operate the locking body to rotate; a locked state, in which the locking body can be partially rotated into the first mounting portion, and the locking body limits the axial displacement of the blade root.

[0008] The locking structure proposed in the above-mentioned prior art cannot have both locking strength and ease of assembly and disassembly, and there is a flow channel cavity, which affects the fluidity of the compressor airflow.

[0009] In view of the above technical problems, the present invention is specially introduced. Summary of the invention

[0010] The main purpose of the present invention is to provide a compressor blade root installation structure, a compressor and an installation method, which replace the bending locking structure, realize non-destructive disassembly and assembly, and ensure the integrity of the flow channel.

[0011] In order to achieve the above-mentioned object, the present invention provides a compressor blade root installation structure, including a wheel disc, a first slot body and a second slot body are provided on the wheel disc, the first slot body is distributed along the axial direction of the wheel disc, and is used to accommodate blades, and the second slot body is distributed along the circumferential direction of the wheel disc, and is used to accommodate a locking structure.

[0012] The invention is characterized in that the 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, and the second locking block is provided with a protrusion on a side close to 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 body. In the second state, the first end face of the protrusion contacts the second end face of the first locking block. In the wheel ring direction, the sum of the sizes of the first locking block and the second locking block is greater than the size of the second groove body. The other side of the second locking block contacts the first blade to limit the axial movement of the first blade.

[0014] Preferably, the first blade is provided with 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 comprises an elastic component, one end of the elastic component is in contact with the second locking block, and the other end of the elastic component is inserted into the bottom of the second slot body.

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

[0017] Preferably, the second locking block is provided with a sliding groove near the elastic component.

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

[0019] Preferably, an end face of the first locking block that is disposed opposite to the first end face contacts a side face of the second blade, and the second blade is disposed 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 disc.

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

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

[0023] ① The first locking block of the present application is used in conjunction with the second locking block, and the blade is locked after the blade is installed by means of the displacement of the second locking block;

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

[0025] ③ An elastic component is provided, and in the second state, the elastic component is in a compressed state, so as to ensure that the second locking block is flush with the flow channel of the wheel disc under the action of elasticity;

[0026] ④ The installation structure of the present application is simple, and the removal and installation processes are reversed, so the locking structure can be disassembled and assembled without destroying the locking structure.

[0027] Another aspect of the present application further proposes a compressor, characterized in that it includes multiple sets of locking structures and adopts the compressor blade root mounting structure of any one of claims 1-9 to axially fix each blade.

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

[0029] ① The compressor adopts multiple locking structures, through the first locking block cooperating with the second locking block, and with the help of the displacement of the second locking block, the blades are locked after the blades are installed;

[0030] ② The tops of the first and second locking blocks in the multiple locking structures used in the compressor are flush with the top of the wheel disc, avoiding the influence of the open cavity on the compressor airflow;

[0031] ③ The compressor adopts multiple sets of locking structures to set 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 impeller under the action of elasticity;

[0032] ④ The multiple locking structures used in the compressor are easy to install, and the removal and installation processes are reversed, so the locking structures can be disassembled and assembled without damaging them.

[0033] Another aspect of the present application further provides a compressor axial blade root installation method, comprising the following steps:

[0034] Step S1, slide the first locking block into the second slot,

[0035] Step S2, slide the second locking block into the second slot, press down the second locking block, so that the protrusion enters the first notch,

[0036] Step S3, sliding the first blade into the first slot,

[0037] Step S4, moving the second locking block in a direction away from the first locking block, the first end face of the protrusion 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] According to the compressor axial blade root installation method of claim 11, it is characterized in that the locking structure also includes an elastic component, and between step S1 and step S2, the elastic component is inserted into the bottom of the second groove body.

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

[0040] ① With the help of the displacement of the second locking block, the blade is locked after the blade is installed;

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

[0042] ③ The locking structure is provided with an elastic component, and the elastic component is in a compressed state in the second state, so as to ensure that the second locking block is flush with the flow channel of the wheel disc under the action of elasticity;

[0043] ④ The dismantling and installation processes are reversed, and the locking structure can be dismantled and assembled without destroying the locking structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0045] Figure 1 A schematic diagram of the structure of a roulette wheel in one embodiment of the present application is shown;

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

[0047] Figure 3 A three-dimensional diagram of a second locking block in one embodiment of the present application is shown;

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

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

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

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

[0052] Figure 8 A flow chart of an installation method in one embodiment of the present application is shown.

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

[0054] 100, roulette wheel; 120, first tank body; 140, second tank body;

[0055] 340, locking structure; 300, first locking block; 400, second locking block; 320, first notch; 420, protrusion; 440, slide groove; 421, first end surface; 321, second end surface;

[0056] 220, first blade; 222, second notch; 240, second blade;

[0057] 500, elastic component; 520, spring; 540, pin. DETAILED DESCRIPTION

[0058] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0059] The present invention is further described in detail below in conjunction with specific embodiments, and these embodiments cannot be understood as limiting the scope of protection claimed by the present invention. The term "including" when used indicates the existence of a feature, but does not exclude the existence or addition of one or more other features; the orientation or position relationship indicated by the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0060] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0061] Embodiment 1:

[0062] This application proposes a compressor blade root installation structure, such as Figure 1 and Figure 6 As shown, the installation structure includes a wheel disc 100, on which a first slot body 120 and a second slot body 140 are provided. The first slot body 120 is distributed along the axial direction of the wheel disc 100 for accommodating blades, and the second slot body 140 is distributed along the circumferential direction of the wheel disc 100 for accommodating locking structures 340. The locking structures 340 are arranged corresponding to the blades, and the locking structures 340 are used to limit 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 for locking contact with the first blade, and the first locking block 300 is used for locking 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 circumferential direction of the wheel disc 100, as shown in FIG. Figure 3 As shown, the second locking block 400 is provided with a protrusion 420 on one side close to 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 slot 120. At this time, the first locking block 300 and the second locking block 400 are both located inside the second slot on the wheel disc, which facilitates the first blade to be sent into the first slot 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, and the sum of the sizes of the first locking block 300 and the second locking block 400 in the circumferential direction of the wheel disc 100 is greater than the size of the second slot 140, so that the second locking block 400 partially enters the first slot where the first blade is located, contacts the first blade 220, and limits the axial movement of the first blade 220. The end face of the first locking block 300 that is opposite to the first end face 421 contacts the side face of the second blade 240.

[0066] A first locking block and a second locking block are provided on both sides of any blade in the compressor. The first locking block cooperates with the second locking block to fix the blade and limit the axial movement of the blade.

[0067] To achieve the locking of the second locking block 400 and the first blade, as shown in the attached Figure 5 As shown, a second notch 222 is correspondingly provided on the first blade on the side close to the second locking block, and the second notch 222 matches the end structure of the first locking block 300. The present 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 disc 100 is less than the depth of the second notch 222 along the circumference of the wheel disc 100. This ensures that the second locking block switches from the first state to the second state after the first blade is installed, and the second locking block can enter the second notch 222.

[0069] In one embodiment of the application, the locking structure 340 is further provided with an elastic component 500, one end of the elastic component 500 is in contact with the second locking block 400, and the other end is inserted into the bottom of the second slot 140. 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 the spring 520 is inserted into the hole at the bottom of the second slot 140. The application does not set specific numerical limits on the size of the spring and the pin, but it should be ensured that the second locking block can enter the second slot 140 when there is no downward pressure on the spring and the pin.

[0070] Under the action of the elastic force of the elastic component 500, the second locking block can freely enter and exit the first notch 320, and ensure that the top of the second locking block is flush with the top of the wheel in the second state to ensure the fluidity of the airflow. It should be noted that in the second state, the elastic component 500 is in a compressed state, and the elastic component can provide support for the second locking block 400 to ensure the flatness of the flow channel. When the compressor is running, the second locking block is subjected to centrifugal force, which reduces the force on the pin 540.

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

[0072] In addition, the second groove body 140 is a dovetail groove or a T-shaped groove, and the size of the second locking block 400 in the radial direction of the wheel disc 100 is smaller than the depth of the second groove body 140, so that the second locking block can be switched between the first state and the second state.

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

[0074] ① The first locking block of the present application is used in conjunction with the second locking block, and the blade is locked after the blade is installed by means of the displacement of the second locking block;

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

[0076] ③ An elastic component is provided, and in the second state, the elastic component is in a compressed state, so as to ensure that the second locking block is flush with the flow channel of the wheel disc under the action of elasticity;

[0077] ④ The installation structure of the present application is simple, and the removal and installation processes are reversed, so the locking structure can be disassembled and assembled without destroying the locking structure.

[0078] In another aspect of the present application, a compressor is also proposed, which includes multiple sets of locking structures to axially fix 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 adopts multiple locking structures, through the first locking block cooperating with the second locking block, and with the help of the displacement of the second locking block, the blades are locked after the blades are installed;

[0081] ② The tops of the first and second locking blocks in the multiple locking structures used in the compressor are flush with the top of the wheel disc, avoiding the influence of the open cavity on the compressor airflow;

[0082] ③ The compressor adopts multiple sets of locking structures to set 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 impeller under the action of elasticity;

[0083] ④ The multiple locking structures used in the compressor are easy to install, and the removal and installation processes are reversed, so the locking structures can be disassembled and assembled without damaging them.

[0084] In addition, the present application also proposes a compressor axial blade root installation method, such as Figure 8 As shown, the specific steps include:

[0085] Step S1, sliding the first locking block 300 into the second slot 140;

[0086] Step S2, slide the second locking block 400 into the second slot 140, press down the second locking block 400, so that the protrusion 420 enters the first notch 320;

[0087] Step S3, sliding the first blade 220 into the first slot 120 to complete the installation of the first blade;

[0088] Step S4, the second locking block 400 is moved away from the first locking block 300, 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, thereby fixing one side of the first blade. At this time, the end face of the first locking block 300 opposite to the first end face 421 contacts the side face of the second blade 240, so that a set of locking structures can fix two adjacent blades on one side.

[0089] Preferably, the locking structure also includes an elastic component 500. Between step S1 and step S2, the elastic component 500 is inserted into the bottom of the second groove body 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 disc with the help 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] ① With the help of the displacement of the second locking block, the blade is locked after the blade is installed;

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

[0093] ③ The locking structure is provided with an elastic component, and the elastic component is in a compressed state in the second state, so as to ensure that the second locking block is flush with the flow channel of the wheel disc under the action of elasticity;

[0094] ④ The dismantling and installation processes are reversed, and the locking structure can be dismantled and assembled without destroying the locking structure.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A compressor blade root mounting structure, comprising a wheel disc (100), wherein the wheel disc (100) is provided with a first slot body (120) and a second slot body (140), wherein the first slot body (120) is distributed along the axial direction of the wheel disc (100) and is used to accommodate blades, and the second slot body (140) is distributed along the circumferential direction of the wheel disc (100) and is used to accommodate a locking structure (340), It is characterized in that The locking structure comprises a first locking block (300) and a second locking block (400); the first locking block (300) is provided with a first notch (320) along the circumferential direction of the wheel disc (100); the second locking block (400) is provided with a protrusion (420) close to the first locking block (300); in a first state, the protrusion (420) fills the first notch (320); the other side of the second locking block (400) is flush with the side wall of the first groove body (120); in a second state, the first end face (421) of the protrusion (420) contacts the second end face (321) of the first locking block (300); in the circumferential direction of the wheel disc (100), the sum of the sizes of the first locking block (300) and the second locking block (400) is greater than the size of the second groove body (140); the other side of the second locking block (400) contacts the first blade (220) to limit the axial movement of the first blade (220).

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) at least partially enters the second notch (222).

3. The compressor blade root mounting structure according to claim 1 or 2, characterized in that: The locking structure further comprises an elastic component (500), one end of the elastic component (500) is in contact with the second locking block (400), and the other end is inserted into the bottom of the second slot body (140).

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

5. The compressor blade root mounting structure according to claim 1 or 2, characterized in that: The second locking block 400 is provided with a sliding groove (440) near the elastic component 500.

6. The compressor blade root mounting structure according to claim 1 or 2, characterized in that: The second groove body (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 disc (100) is smaller than the depth of the second groove body (140).

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

8. 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 disc (100).

9. 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 disc (100) is smaller than the depth of the second notch (220) along the circumference of the wheel disc (100).

10. A compressor, characterized in that: It comprises a plurality of groups of the locking structures, and adopts the compressor blade root mounting structure according to any one of claims 1 to 9 to axially fix each blade.

11. A method for installing an axial blade root of a compressor, using the blade root installation structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1, sliding the first locking block (300) into the second slot (140), Step S2, slide the second locking block (400) into the second slot (140), press the second locking block (400) downward, so that the protrusion (420) enters the first notch (320), Step S3, sliding the first blade (220) into the first slot (120), Step S4, move the second locking block (400) in a direction away from the first locking block (300), the first end surface (421) of the protrusion (420) contacts the second end surface (321) of the first locking block (300), and the other side of the second locking block (400) contacts the second notch (220) on the first blade (220).

12. The compressor axial blade root installation method according to claim 11, characterized in that: The locking structure further comprises an elastic component (500). Between step S1 and step S2, the elastic component (500) is inserted into the bottom of the second groove body (140).

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