Stationary blade seal leakage gas exhaust structure and gas compressor

Abstract

The utility model provides a stationary blade sealing leakage gas exhausting structure and a gas compressor, and belongs to the technical field of stationary blade sealing leakage gas exhausting. The stationary blade sealing leakage gas exhausting structure comprises a rotor, a movable blade set, a stationary blade set, a sealing piece and a flow guide part; the rotor drives the movable blade set to rotate relative to the fixed blade set to generate main airflow flowing from the first movable blade set to the second movable blade set. The sealing piece is tightly attached to the rotor so as to reduce the backflow phenomenon of main airflow, the rotor and the sealing piece define a sealed leakage gas channel, and sealing leakage gas flows out of the leakage gas channel, then is converged with the main airflow and flows to the high-pressure side of the gas compressor; by arranging the flow guide part on the rotor, sealing leakage gas is guided when flowing out of the leakage gas channel, the exhaust angle of the sealing leakage gas is changed, interference and impact on main flow when the sealing leakage gas is converged into the main flow are reduced, separation of the main flow is reduced, and the influence of the leakage gas on the gas flow near the blade root of the stationary blade group is reduced; and smooth circulation of mainstream airflow is ensured.

Description

Technical Field

[0001] This application belongs to the field of gas exhaust technology for stationary blade seal leakage, specifically relating to a gas exhaust structure and compressor for stationary blade seal leakage. Background Technology

[0002] Axial flow compressors are characterized by high efficiency, small size, large flow rate, and compact structure, and are widely used in engineering fields such as petrochemicals, fermentation, and metallurgy. Industrial axial flow compressors typically have multiple stages, and leakage airflow from the stationary impeller hub seal can significantly interfere with the flow of the mainstream airflow, affecting its smooth operation. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] Therefore, the first aspect of this utility model provides a stationary leaf seal leakage gas exhaust structure.

[0005] The second aspect of this utility model provides an air compressor.

[0006] In view of this, a first aspect of the embodiments of this application provides a stationary vane seal leakage gas exhaust structure, comprising:

[0007] Rotor;

[0008] A moving blade assembly is mounted on the rotor, and the moving blade assembly includes at least a first moving blade assembly and a second moving blade assembly.

[0009] The stationary blade group is located between the first moving blade group and the second moving blade group.

[0010] The seal is installed on the rotor and is located between the first moving blade group and the second moving blade group. The seal fits against the rotor, forming a leakage gas passage between the seal and the rotor.

[0011] The flow guide is located on the side wall of the rotor and guides the gas in the leakage gas passage.

[0012] In one feasible implementation, the stationary vane seal leakage gas venting structure further includes:

[0013] The housing is fitted onto the outside of the moving blade assembly, while the stationary blade assembly is mounted on the inner wall of the housing to secure it.

[0014] In one feasible implementation, the seal is arranged around the outside of the rotor circumferentially.

[0015] In one feasible implementation, the stationary vane seal leakage gas venting structure further includes:

[0016] A receiving groove is formed on the outer wall of the seal;

[0017] The stationary blade assembly includes several stationary blades, with at least some of the stationary blades embedded in the receiving groove.

[0018] In one feasible implementation, the guide portion is disposed between the seal and the second moving blade assembly.

[0019] In one feasible implementation, the stationary vane seal leakage gas venting structure further includes:

[0020] The mounting groove is formed on the side wall of the rotor along the circumference of the rotor. The seal is embedded in the mounting groove, the inner side wall of the seal is in contact with the bottom surface of the mounting groove, and there is a gap between the end face of the seal and the groove wall of the mounting groove.

[0021] In one feasible implementation, the stationary vane seal leakage gas venting structure further includes:

[0022] A first conical surface is provided on the side wall of the rotor;

[0023] A second conical surface is provided on the outer wall of the seal, and the second conical surface is located in the same conical surface as the first conical surface.

[0024] In one feasible implementation, the flow guide is disposed on the first conical surface.

[0025] In one feasible implementation, a first inclined surface is provided on the flow guide, and the first inclined surface is set at an angle to the flow direction of the mainstream airflow.

[0026] The mainstream airflow flows in a direction parallel to the rotor's axis, and the mainstream airflow flows from the first moving blade group to the second moving blade group.

[0027] According to a second aspect of the embodiments of this application, a compressor is provided, comprising: a stationary vane sealing leakage gas exhaust structure as described in any of the above technical solutions.

[0028] The present application discloses a venting structure and compressor for venting leaking gas from a stationary vane seal. Compared with the prior art, the advantages are as follows:

[0029] The stationary blade seal leakage gas exhaust structure provided in this application embodiment includes a rotor, a moving blade assembly, a stationary blade assembly, a seal, and a guide section. The moving blade assembly is mounted on the rotor, and the rotor drives the moving blade assembly to rotate relative to the stationary blade assembly, generating a mainstream airflow from the first moving blade assembly to the second moving blade assembly. The seal is tightly fitted to the rotor to reduce the backflow of the mainstream airflow. The rotor and the seal form a sealed leakage gas channel. After the sealed leakage gas flows out of the leakage gas channel, it merges with the mainstream airflow and flows towards the high-pressure side of the compressor. By setting a guide section on the rotor, the sealed leakage gas is guided when it flows out of the leakage gas channel, changing the exhaust angle of the sealed leakage gas, reducing the interference and impact on the mainstream airflow when the sealed leakage gas merges into the mainstream airflow, reducing the separation of the mainstream airflow, reducing the impact of the leakage gas on the airflow near the root of the stationary blade assembly, and ensuring smooth flow of the mainstream airflow. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 A schematic structural diagram of the first angle of the stationary blade seal leakage gas exhaust structure according to an embodiment of this application;

[0032] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0033] in, Figure 1 and Figure 2 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0034] 11. Rotor; 12. First moving blade group; 13. Second moving blade group; 14. Stationary blade group; 15. Seal; 16. Guide section; 17. Housing; 18. Receiving groove; 19. Mounting groove;

[0035] 111. First conical surface; 151. Second conical surface;

[0036] a. Direction of sealing gas flow; b. Direction of mainstream airflow. Detailed Implementation

[0037] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the 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. Therefore, they should not be construed as limitations on this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0041] like Figure 1 and Figure 2 As shown, according to a first aspect of the embodiments of this application, a stationary blade seal leakage gas exhaust structure is proposed, comprising: a rotor 11, a moving blade assembly, a stationary blade assembly 14, a seal 15, and a guide portion 16; the moving blade assembly is disposed on the rotor 11, and the moving blade assembly includes at least a first moving blade assembly 12 and a second moving blade assembly 13; the stationary blade assembly 14 is disposed between the first moving blade assembly 12 and the second moving blade assembly 13; the seal 15 is disposed on the rotor 11, and the seal 15 is located between the first moving blade assembly 12 and the second moving blade assembly 13, and the seal 15 is in contact with the rotor 11, forming a leakage gas channel between the seal 15 and the rotor 11; the guide portion 16 is disposed on the side wall of the rotor 11, and the guide portion 16 guides the gas flowing out in the leakage gas channel.

[0042] The stationary blade seal leakage gas exhaust structure provided in this embodiment includes a rotor 11, a moving blade assembly, a stationary blade assembly 14, a seal 15, and a guide section 16. The moving blade assembly is mounted on the rotor 11, and the rotor 11 drives the moving blade assembly to rotate relative to the stationary blade assembly 14, generating a mainstream airflow from the first moving blade assembly 12 to the second moving blade assembly 13. The seal 15 is tightly fitted to the rotor 11 to reduce the backflow of the mainstream airflow. The rotor 11 and the seal 15 form a sealed leakage gas channel. After the sealed leakage gas flows out of the leakage gas channel, it merges with the mainstream airflow and flows towards the high-pressure side of the compressor. By providing the guide section 16 on the rotor 11, the sealed leakage gas is guided when it flows out of the leakage gas channel, changing the exhaust angle of the sealed leakage gas, reducing the interference and impact on the mainstream airflow when the sealed leakage gas merges into the mainstream airflow, reducing the separation of the mainstream airflow, reducing the impact of the leakage gas on the airflow near the blade root of the stationary blade assembly 14, and ensuring smooth flow of the mainstream airflow.

[0043] Furthermore, rotor 11 is the main shaft of the compressor. In the moving blade group, the first moving blade group 12 and the second moving blade group 13 are two adjacent moving blade groups; in the first moving blade group 12 and the second moving blade group 13, the first moving blade group 12 is located on the low-pressure side of the compressor, and the second moving blade group 13 is located on the high-pressure side of the compressor.

[0044] It should be noted that when the compressor is working, the mainstream airflow flows from the low-pressure side to the high-pressure side of the compressor, that is, from the first moving blade group 12 to the second moving blade group 13. After the sealing leakage gas flows out from the leakage gas channel, it merges into the mainstream airflow from the root of the second moving blade group 13. When the sealing leakage gas flows out directly, the sealing leakage airflow will impact the blade root of the stationary blade group 14. By setting the guide part 16 on the side wall of the rotor 11 to guide the sealing leakage gas in the leakage gas channel, the interference of the sealing leakage airflow on the airflow root of the stationary blade group 14 is reduced, thereby reducing the impact of the leakage airflow on the blade root of the stationary blade group 14, which is beneficial to improving the efficiency and surge margin of the axial compressor.

[0045] Furthermore, the first moving blade group 12 includes several first blades, which are arranged circumferentially on the side wall of the rotor 11; the second moving blade group 13 includes several second blades, which are arranged circumferentially on the side wall of the rotor 11, so that the rotor 11 drives the first and second blades to rotate and generate airflow.

[0046] Specifically, such as Figure 1 , a is the direction of the sealing gas flow, and b is the direction of the mainstream airflow.

[0047] like Figure 1As shown, in one feasible embodiment, the stationary blade seal leakage gas exhaust structure further includes: a housing 17; the housing 17 is fitted on the outside of the moving blade assembly, and the stationary blade assembly 14 is disposed on the inner wall of the housing 17 to fix the stationary blade assembly 14.

[0048] In this technical solution, the housing 17 is located on the outside of the moving blade assembly, and the stationary blade assembly 14 is fixed on the inner wall of the housing 17 to ensure the stability of the stationary blade assembly 14. The rotor 11 drives the moving blade assembly to rotate relative to the stationary blade assembly 14, generating the mainstream airflow.

[0049] It is understood that the stationary blade assembly 14 includes several stationary blades, which are arranged circumferentially on the inner wall of the housing 17. The end of the stationary blade connected to the housing 17 is the root part of the stationary blade, and the end of the stationary blade extending away from the housing 17 is the tip part of the stationary blade. The seal 15 is arranged between the tip of the stationary blade and the main shaft.

[0050] like Figure 1 and Figure 2 As shown, in one possible embodiment, the seal 15 is annular and is disposed around the outside of the rotor 11.

[0051] In this technical solution, the seal 15 is annular and is arranged around the outside of the rotor 11 along the circumference of the rotor 11 to seal in the circumference of the rotor 11, ensuring the integrity of the seal, reducing the amount of gas leakage from the high-pressure area to the low-pressure area, that is, reducing the amount of gas leakage from the second moving blade group 13 to the first moving blade group 12, preventing backflow of airflow, and ensuring the stability of the pressure gradient between the stages of the compressor.

[0052] like Figure 2 As shown, in one feasible embodiment, the stationary vane seal leakage gas exhaust structure further includes: a receiving groove 18; the receiving groove 18 is formed on the outer side wall of the seal 15; the stationary vane assembly 14 includes a plurality of stationary vanes, at least some of which are embedded in the receiving groove 18.

[0053] In this technical solution, the seal 15 is provided with a receiving groove 18, and the tip of the stationary blade is embedded in the receiving groove 18. The stationary blade locks and limits the seal 15 to ensure the stability of the seal 15 fixed on the rotor 11.

[0054] Furthermore, the shape of the receiving groove 18 is adapted to the shape of the tip of the stationary blade to ensure the reliability of the stationary blade in locking and fixing the seal 15.

[0055] like Figure 1 and Figure 2 As shown, in one feasible embodiment, the flow guide 16 is disposed between the seal 15 and the second moving blade assembly 13.

[0056] In this technical solution, the guide section 16 is located between the seal 15 and the second moving blade group 13. As the mainstream airflow generated by the compressor operation flows from the first moving blade group 12 to the second moving blade group 13, the leakage gas passage will be filled with sealing leakage gas under the sealing and blocking effect of the seal 15. The guide section 16 guides the sealing leakage gas when it flows out, changes the discharge angle of the sealing leakage gas, reduces the impact of the sealing leakage gas on the mainstream airflow on the high-pressure side when it is discharged, reduces the separation of the mainstream airflow, and ensures smooth airflow, thereby helping to improve the efficiency and surge margin of the axial compressor.

[0057] like Figure 1 and Figure 2 As shown, in one feasible embodiment, the stationary blade seal leakage gas exhaust structure further includes: a mounting groove 19, which is annular and is opened on the side wall of the rotor 11 along the circumference of the rotor 11; a seal 15 is embedded in the mounting groove 19; the inner side wall of the seal 15 is in contact with the bottom surface of the mounting groove 19; and there is a gap between the end face of the seal 15 and the groove wall of the mounting groove 19, so as to form a leakage gas channel between the seal 15 and the second moving blade assembly 13.

[0058] In this technical solution, the seal 15 is disposed within the annular mounting groove 19 on the side wall of the rotor 11, allowing the seal 15 to be embedded inside the rotor 11. This prevents the seal 15 from obstructing the mainstream airflow generated by the rotation of the moving blade assembly, ensuring smooth mainstream airflow. The inner side wall of the annular seal 15 fits against the bottom of the mounting groove 19, and a gap is left between the end face of the annular seal 15 and the groove wall of the mounting groove 19, ensuring that leaked gas can merge into the mainstream airflow and flow towards the high-pressure side after being discharged from the leak gas passage.

[0059] As a preferred embodiment, the seal 15 is completely embedded inside the rotor 11, so that the seal 15 does not protrude from the rotor 11, thereby allowing the seal 15 to avoid the flow path of the mainstream airflow and reducing the obstruction of the mainstream airflow by the seal 15.

[0060] In one feasible implementation, the stationary vane seal leakage gas exhaust structure further includes: a first conical surface 111 is provided on the side wall of the rotor 11; a second conical surface 151 is provided on the outer side wall of the seal 15, and the second conical surface 151 and the first conical surface 111 are located in the same conical surface.

[0061] In this technical solution, the second conical surface 151 on the outer side wall of the seal 15 and the first conical surface 111 on the side wall of the rotor 11 are located in the same conical surface, making the joint between the seal 15 and the rotor 11 smooth, which is beneficial to further reduce the airflow disturbance generated when the mainstream airflow flows through the seal 15.

[0062] In some examples, the first conical surface 111 is the sidewall of the rotor 11. The second conical surface 151 is the outer sidewall of the seal 15, and the receiving groove 18 is an opening on the second conical surface 151 to improve the flatness of the sidewall surface of the rotor 11 after the seal 15 is installed inside the rotor 11, thereby helping to reduce obstruction to the flow of the main airflow.

[0063] In one possible implementation, the flow guide 16 is disposed on the first conical surface 111.

[0064] In this technical solution, the guide section 16 is disposed on the first conical surface 111 to improve the shape of the inner wall of the leakage gas passage discharge end, thereby controlling the direction and angle of the sealing leakage gas discharge.

[0065] In one feasible implementation, the guide section 16 is provided with a first inclined surface, which is set at an angle to the direction of the mainstream airflow; wherein, the mainstream airflow flows in a direction parallel to the axis of the rotor 11, and the mainstream airflow flows from the first moving blade group 12 to the second moving blade group 13.

[0066] In this technical solution, when the sealing leakage gas flows through the first inclined surface, the first inclined surface changes the exhaust angle of the sealing leakage gas, reduces the angle between the sealing leakage gas flow and the mainstream flow, avoids the sealing leakage gas from causing a large impact on the mainstream flow, eliminates airflow separation, and reduces the airflow interference of the sealing leakage gas flow to the root of the stationary blade.

[0067] Furthermore, the first inclined surface is the guide section 16, which allows the guide section 16 to be directly formed by cutting the rotor 11, thus making the processing of the guide section 16 simple and convenient.

[0068] Furthermore, the angle between the first inclined surface and the axis of the rotor 11 is 40 to 50 degrees, which can effectively reduce the impact of the sealing leakage airflow on the root of the stationary blade and ensure the exhaust efficiency of the sealing leakage air. As a preferred embodiment, the angle between the first inclined surface and the axis of the rotor 11 is 45 degrees, which minimizes the impact of the sealing leakage airflow on the root of the stationary blade.

[0069] According to a second aspect of this application, a compressor is proposed, comprising: a stationary vane sealing leakage gas exhaust structure as described in any of the above technical solutions.

[0070] The compressor provided in this application includes a stationary vane seal leakage gas exhaust structure as described in any of the above technical solutions. Therefore, the compressor has all the beneficial effects of the stationary vane seal leakage gas exhaust structure described in the above technical solutions, which will not be elaborated here.

[0071] In the compressor provided in this application embodiment, the moving blade assembly is mounted on the rotor 11. The rotor 11 drives the moving blade assembly to rotate relative to the stationary blade assembly 14, generating a mainstream airflow from the first moving blade assembly 12 to the second moving blade assembly 13. The sealing element 15 is tightly fitted to the rotor 11 to reduce the backflow of the mainstream airflow. The rotor 11 and the sealing element 15 form a sealed leakage gas channel. After the sealed leakage gas is discharged from the leakage gas channel, it merges with the mainstream airflow and flows towards the high-pressure side of the compressor. By providing a guide part 16 on the rotor 11, the sealed leakage gas is guided when it is discharged from the leakage gas channel, changing the exhaust angle of the sealed leakage gas, reducing the interference and impact on the mainstream airflow when the sealed leakage gas merges into the mainstream airflow, reducing the separation of the mainstream airflow, reducing the impact of the leakage airflow on the airflow near the blade root of the stationary blade assembly 14, and ensuring smooth flow of the mainstream airflow.

[0072] Specifically, the compressor may include an axial flow compressor.

[0073] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0074] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A gas exhaust structure for a stationary vane seal leakage gas, characterized in that, The stationary vane seal leakage gas exhaust structure includes: Rotor; A moving blade assembly, wherein the moving blade assembly is disposed on the rotor, and the moving blade assembly includes at least a first moving blade assembly and a second moving blade assembly; A stationary blade group is disposed between the first moving blade group and the second moving blade group; A sealing element is disposed on the rotor, the sealing element is located between the first moving blade group and the second moving blade group, the sealing element is in contact with the rotor, and a leakage gas passage is formed between the sealing element and the rotor; A flow guide is provided on the side wall of the rotor, which guides the gas in the leakage gas passage.

2. The stationary blade seal leakage gas exhaust structure according to claim 1, characterized in that, The stationary vane seal leakage gas exhaust structure also includes: The housing is fitted onto the outside of the moving blade assembly, and the stationary blade assembly is disposed on the inner wall of the housing to fix the stationary blade assembly.

3. The stationary vane seal leakage gas exhaust structure according to claim 1, characterized in that, The seal is arranged around the outside of the rotor along the circumference of the rotor.

4. The stationary vane seal leakage gas exhaust structure according to claim 3, characterized in that, The stationary vane seal leakage gas exhaust structure also includes: A receiving groove is formed on the outer wall of the seal; The stationary blade assembly includes a plurality of stationary blades, at least some of which are embedded in the receiving groove.

5. The stationary vane seal leakage gas exhaust structure according to claim 3, characterized in that, The flow guide is disposed between the seal and the second moving blade assembly.

6. The stationary vane seal leakage gas exhaust structure according to claim 5, characterized in that, The stationary vane seal leakage gas exhaust structure also includes: The mounting groove is formed on the side wall of the rotor along the circumference of the rotor. The seal is embedded in the mounting groove. The inner side wall of the seal is in contact with the bottom surface of the mounting groove. There is a gap between the end face of the seal and the groove wall of the mounting groove.

7. The stationary vane seal leakage gas exhaust structure according to claim 5, characterized in that, The stationary vane seal leakage gas exhaust structure also includes: The rotor has a first conical surface on its side wall; The outer wall of the seal is provided with a second conical surface, which is located within the same conical surface as the first conical surface.

8. The stationary vane seal leakage gas exhaust structure according to claim 7, characterized in that, The flow guide is disposed on the first conical surface.

9. The stationary vane seal leakage gas exhaust structure according to claim 5, characterized in that, The guide section is provided with a first inclined surface, which is set at an angle to the direction of the mainstream airflow. The mainstream airflow flows in a direction parallel to the axis of the rotor, and the mainstream airflow flows from the first moving blade group to the second moving blade group.

10. A compressor, characterized in that, Includes the stationary blade seal leakage gas exhaust structure as described in any one of claims 1 to 9.

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