Sandblasting nozzle for internal cavities of turbine blades
By designing the outer peripheral outlet, inclined tail section, and miniaturized nozzle structure of the sandblasting nozzle, the problem of difficult removal of hot corrosion products in the internal cavity of turbine blades was solved, achieving efficient and economical sandblasting treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SIEMENS GAS TURBINE COMPONENTS (JIANGSU) CO LTD
- Filing Date
- 2025-05-14
- Publication Date
- 2026-05-29
AI Technical Summary
The hot corrosion products inside the turbine blade cavity are difficult to dissolve with acid, causing cracks to be covered up. Existing sandblasting treatments are ineffective in removing them, affecting the repair results.
Design a sandblasting nozzle with the nozzle outlet located on the outer peripheral surface, multiple outlets circumferentially staggered, an inclined tail section design to reduce abrasive clogging, miniaturized nozzle and welded to the connector, threaded connection for easy replacement, and multiple outlets connected to the same inlet.
It achieves efficient jetting of abrasive into the internal cavity side surface of turbine blades, reducing costs, improving reliability and ease of use, and is suitable for small turbine blades.
Smart Images
Figure CN224295619U_ABST
Abstract
Description
Technical Field
[0001] This disclosure pertains to the field of sandblasting, and specifically relates to a sandblasting nozzle for the internal cavity of a turbine blade. Background Technology
[0002] It is known that internal cavities can be incorporated into turbine blades to facilitate gas flow and reduce blade temperature. However, these internal cavities may exhibit varying degrees of hot corrosion on operational turbine blades. This corrosion is not rust in the traditional sense, but rather consists of sulfates or other mixed salts, making it difficult to dissolve with acid. During turbine blade repair, this corrosion can mask cracks on the inner surface of the blade, making them difficult to detect. Therefore, a sandblasting nozzle that can be inserted into the internal cavity is desired, enabling the removal of this corrosion through sandblasting. Utility Model Content
[0003] This disclosure provides a sandblasting nozzle for an internal cavity of a turbine blade, the sandblasting nozzle including a nozzle for insertion into the internal cavity, the nozzle including: an inlet disposed at a first end of the nozzle; an outlet disposed at a second end of the nozzle opposite to the first end and positioned on an outer peripheral surface of the nozzle; and a channel communicating the inlet and the outlet, the channel including a tail section adjacent to the outlet, the tail section extending radially outward while extending toward the second end in an axial direction along the nozzle.
[0004] In this disclosure, by positioning the outlet on the outer peripheral surface of the nozzle, the outlet can face the side surface of the internal cavity when the nozzle is inserted into the internal cavity, making it easy to spray abrasive onto the side surface of the internal cavity. Simultaneously, by providing an inclined tail section, the tail section can reduce the resistance of the abrasive reaching the outlet, thereby preventing abrasive blockage of the channel.
[0005] Furthermore, the nozzle includes a plurality of outlets, which are offset from each other in the circumferential direction of the nozzle.
[0006] In this disclosure, by staggering multiple outlets in the circumferential direction, the sandblasting nozzle can simultaneously spray abrasive in multiple directions, enabling the abrasive to be efficiently sprayed onto the side surface of the internal cavity.
[0007] Furthermore, multiple of the said exits are connected to the same said inlet.
[0008] In this disclosure, by connecting multiple outlets to the same inlet, the sandblasting nozzle can have a simple structure, thereby reducing costs.
[0009] Furthermore, the plurality of said outlets are arranged side by side in the circumferential direction of the nozzle.
[0010] In this disclosure, by arranging multiple outlets side by side in the circumferential direction, the abrasive can be supplied to each outlet under substantially the same conditions, so that the abrasive can be evenly distributed to each outlet.
[0011] Furthermore, the channel includes a plurality of tail segments corresponding one-to-one with the plurality of outlets.
[0012] In this disclosure, by setting multiple tail sections that correspond one-to-one with multiple outlets, even if one or some of the tail sections are blocked by abrasive, the remaining unblocked tail sections can still supply abrasive to the corresponding outlet, thus making the sandblasting nozzle highly reliable.
[0013] Furthermore, the angle between the extension direction of the tail section and the axial direction of the nozzle is 30° to 60°.
[0014] In this disclosure, by making the angle between the extension direction of the tail section and the axial direction of the nozzle 30° to 60°, the tail section can have a suitable length while reducing resistance, so that the nozzle is not too long, thereby making the sandblasting gun including the sandblasting nozzle easy to use.
[0015] Furthermore, the outer diameter of the nozzle is less than or equal to 8 mm.
[0016] In this disclosure, by making the outer diameter of the nozzle less than or equal to 8 mm, the sandblasting nozzle can be applied to smaller turbine blades.
[0017] Furthermore, the sandblasting nozzle also includes a connector for engaging with the spray gun body, into which the spray pipe is inserted.
[0018] In this disclosure, by inserting the nozzle into the connector, the sandblasting nozzle can have a simple structure, thereby reducing costs.
[0019] Furthermore, the connector includes a threaded portion for engaging with the spray gun body.
[0020] In this disclosure, by screwing the connector into the spray gun body, the sandblasting nozzle can be easily replaced, making the sandblasting gun including the sandblasting nozzle easy to use.
[0021] Furthermore, the nozzle is welded to the joint.
[0022] In this disclosure, by welding the nozzle to the connector, the nozzle and the connector can be tightly connected together, which is beneficial for the miniaturization of the sandblasting nozzle. Attached Figure Description
[0023] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this disclosure, illustrate exemplary embodiments of the present disclosure and are used to explain the disclosure, but do not constitute an undue limitation of the disclosure. In the drawings:
[0024] Figure 1 This is a perspective view showing a sandblasting nozzle for an internal cavity of a turbine blade according to an embodiment of the present disclosure;
[0025] Figure 2 This is a cross-sectional view showing a sandblasting nozzle for an internal cavity of a turbine blade according to an embodiment of the present disclosure.
[0026] Explanation of reference numerals in the attached figures:
[0027] 100. Nozzle;
[0028] 110. First end;
[0029] 120. The second end;
[0030] 130. Entrance;
[0031] 140. Export;
[0032] 150. Channel;
[0033] 151. Tail section;
[0034] 152. Main paragraph;
[0035] 200. Connector;
[0036] 210. Threaded section;
[0037] 220. Guidance Department;
[0038] 230. Flange;
[0039] A. Axial direction;
[0040] C. Circumferential direction. Detailed Implementation
[0041] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.
[0042] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise.
[0043] In the following description, embodiments of the present disclosure will be described with reference to the accompanying drawings.
[0044] Figure 1 This is a perspective view showing a sandblasting nozzle for an internal cavity of a turbine blade according to an embodiment of the present disclosure. Figure 2 This is a cross-sectional view showing a sandblasting nozzle for an internal cavity of a turbine blade according to an embodiment of the present disclosure.
[0045] refer to Figure 1 and Figure 2 The blasting nozzle for the internal cavity of a turbine blade (not shown) includes a nozzle 100 for insertion into the internal cavity. The nozzle 100 includes: an inlet 130 disposed at a first end 110 of the nozzle 100; an outlet 140 disposed at a second end 120 of the nozzle 100 opposite to the first end 110 and positioned on the outer peripheral surface of the nozzle 100; and a channel 150 connecting the inlet 130 and the outlet 140. The channel 150 includes a tail section 151 adjacent to the outlet 140, the tail section 151 extending radially outward while extending toward the second end 120 along the axial direction A of the nozzle 100.
[0046] In this document, unless otherwise stated, “axial,” “circumferential,” and “radial” refer to the axial, circumferential, and radial directions of the nozzle 100, respectively.
[0047] As an example, the root of the turbine blade may be provided with an opening that communicates with the internal cavity, through which the nozzle 100 can be inserted into the internal cavity.
[0048] As an example, the nozzle 100 can be rigid. For instance, the nozzle 100 can be made of a wear-resistant metal material, preferably tungsten steel.
[0049] As an example, the nozzle 100 may have an elongated shape. For instance, the nozzle 100 may have a straight shape, and preferably, it may have a cylindrical shape.
[0050] As an example, inlet 130 can be located on the axial surface of the first end 110 (a surface perpendicular to the axial direction A of nozzle 100). For example, inlet 130 can be circular and arranged coaxially with nozzle 100. Conversely, since outlet 140 is not located on the axial surface of the second end 120, the second end 120 can be closed.
[0051] As an example, the channel 150 may also include a main section 152. The main section 152 may be adjacent to the inlet 130 and the tail section 151 and extend in the axial direction A of the nozzle 100. For example, the main section 152 may have a circular cross-section (a cross-section perpendicular to the axial direction A of the nozzle 100) and be arranged coaxially with the nozzle 100.
[0052] In this disclosure, by providing the outlet 140 on the outer peripheral surface of the nozzle 100, the outlet 140 can face the side surface of the internal cavity when the nozzle 100 is inserted into the internal cavity, making it easy to spray abrasive onto the side surface of the internal cavity. Simultaneously, by providing the inclined tail section 151, the tail section 151 can reduce the resistance of the abrasive reaching the outlet 140, thereby preventing the abrasive from clogging the channel 150.
[0053] refer to Figure 2 The angle between the extension direction of the tail section 151 and the axial direction A of the nozzle 100 is 30° to 60°.
[0054] As an example, the angle between the extension direction of the tail section 151 and the axial direction A of the nozzle 100 can be 40° to 50°, for example, 45°.
[0055] In this disclosure, by making the angle between the extension direction of the tail section 151 and the axial direction A of the nozzle 100 30° to 60°, the tail section 151 can have a suitable length while reducing resistance, so that the nozzle 100 is not too long, and the sandblasting gun including the sandblasting nozzle is easy to use.
[0056] refer to Figure 1 and Figure 2 The outer diameter of nozzle 100 is less than or equal to 8 mm.
[0057] As an example, the outer diameter of the nozzle 100 can be less than or equal to 6 mm, for example, it can be 5 mm.
[0058] As an example, the diameter of channel 150 can be less than or equal to 4 mm, for example, it can be 2 mm to 3 mm.
[0059] In this case, the abrasive may include alumina. The mesh size of the abrasive may be greater than or equal to 80 mesh, for example, 90 mesh. The pressure of the gas used to transport the abrasive may be from 0.2 MPa to 0.4 MPa, for example, 0.2 MPa.
[0060] In this disclosure, by making the outer diameter of the nozzle 100 less than or equal to 8 mm, the sandblasting nozzle can be applied to smaller turbine blades.
[0061] refer to Figure 1 and Figure 2The sandblasting nozzle also includes a connector 200 for engaging with the spray gun body (not shown), into which the nozzle 100 is inserted.
[0062] In other words, the aforementioned sandblasting nozzle and gun body can constitute at least a part of a sandblasting gun.
[0063] As an example, the connector 200 may have a generally cylindrical shape and be arranged coaxially with the nozzle 100.
[0064] As an example, 10% to 20% of the total length of the nozzle 100 may be located inside the connector 200, for example, 15% to 18% of the total length of the nozzle 100 may be located inside the connector 200.
[0065] As an example, connector 200 may include a guide 220 for guiding abrasive to inlet 130. For example, guide 220 may taper toward inlet 130.
[0066] In this disclosure, by inserting the nozzle 100 into the connector 200, the sandblasting nozzle can have a simple structure, thereby reducing costs.
[0067] refer to Figure 1 and Figure 2 The connector 200 includes a threaded portion 210 for engaging with the spray gun body.
[0068] As an example, the threaded portion 210 may include an external thread provided on the outer peripheral surface of the connector 200. In other examples, the threaded portion 210 may also include an internal thread provided on the inner peripheral surface of the connector 200.
[0069] As an example, the connector 200 may also include a radially outwardly projecting flange 230, which may be configured to abut against the spray gun body when the threaded portion 210 engages with the spray gun body, so as to prevent the connector 200 from rotating relative to the spray gun body.
[0070] In this disclosure, by screwing the connector 200 into the spray gun body, the sandblasting nozzle can be easily replaced, making the sandblasting spray gun including the sandblasting nozzle easy to use.
[0071] refer to Figure 1 and Figure 2 The nozzle 100 is welded to the connector 200.
[0072] In this disclosure, by welding the nozzle 100 to the connector 200, the nozzle 100 and the connector 200 can be compactly connected together, which is beneficial to the miniaturization of the sandblasting nozzle.
[0073] It should be understood that, although Figure 1 and Figure 2The nozzle 100 shown has only one outlet 140; however, in other embodiments, the nozzle 100 may include multiple outlets 140, which may be offset from each other in the circumferential direction C of the nozzle 100.
[0074] As an example, the number of exports 140 can be two to four, for example, three.
[0075] In this disclosure, by staggering the multiple outlets 140 in the circumferential direction C, the sandblasting nozzle can simultaneously spray abrasive in multiple directions, enabling the abrasive to be efficiently sprayed onto the side surface of the internal cavity.
[0076] In other embodiments, multiple outlets 140 may be connected to the same inlet 130.
[0077] In this disclosure, by connecting multiple outlets 140 to the same inlet 130, the sandblasting nozzle can have a simple structure, thereby reducing costs.
[0078] In other embodiments, the plurality of outlets 140 may be arranged side by side in the circumferential direction C of the nozzle 100.
[0079] As an example, multiple outlets 140 can be evenly spaced in the circumferential direction C of the nozzle 100.
[0080] In this disclosure, by arranging multiple outlets 140 side by side in the circumferential direction C, the abrasive can be supplied to each outlet 140 under substantially the same conditions, so that the abrasive can be evenly distributed to each outlet 140.
[0081] In other embodiments, channel 150 may include a plurality of tail segments 151 corresponding one-to-one with a plurality of outlets 140.
[0082] As an example, each of the multiple tail segments 151 may extend from the same end of the main segment 152.
[0083] In this disclosure, by setting multiple tail sections 151 corresponding one-to-one with multiple outlets 140, even if one or some of the multiple tail sections 151 are blocked by abrasive, the remaining unblocked tail sections 151 can still supply abrasive to the corresponding outlet 140, thus making the sandblasting nozzle highly reliable.
[0084] The above are merely preferred embodiments of this disclosure. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this disclosure, and these improvements and modifications should also be considered within the scope of protection of this disclosure.
Claims
1. A sandblasting nozzle for the internal cavity of a turbine blade, characterized in that, The sandblasting nozzle includes a nozzle (100) for insertion into the internal cavity. The nozzle (100) includes: An inlet (130) is provided at the first end (110) of the nozzle (100); An outlet (140) is disposed at a second end (120) of the nozzle (100) opposite to the first end (110) and positioned on the outer peripheral surface of the nozzle (100); and The channel (150) connects the inlet (130) and the outlet (140), the channel (150) including a tail section (151) adjacent to the outlet (140), the tail section (151) extending radially outward while extending toward the second end (120) along the axial direction (A) of the nozzle (100).
2. The sandblasting nozzle according to claim 1, characterized in that, The nozzle (100) includes a plurality of outlets (140) that are offset from each other in the circumferential direction (C) of the nozzle (100).
3. The sandblasting nozzle according to claim 2, characterized in that, The multiple outlets (140) are connected to the same inlet (130).
4. The sandblasting nozzle according to claim 3, characterized in that, The plurality of outlets (140) are arranged side by side in the circumferential direction (C) of the nozzle (100).
5. The sandblasting nozzle according to claim 3, characterized in that, The channel (150) includes a plurality of tail segments (151) corresponding one-to-one with the plurality of outlets (140).
6. The sandblasting nozzle according to any one of claims 1 to 5, characterized in that, The angle between the extension direction of the tail section (151) and the axial direction (A) of the nozzle (100) is 30° to 60°.
7. The sandblasting nozzle according to any one of claims 1 to 5, characterized in that, The outer diameter of the nozzle (100) is less than or equal to 8 mm.
8. The sandblasting nozzle according to any one of claims 1 to 5, characterized in that, The sandblasting nozzle also includes a connector (200) for engaging with the spray gun body, into which the spray pipe (100) is inserted.
9. The sandblasting nozzle according to claim 8, characterized in that, The connector (200) includes a threaded portion (210) for engaging with the spray gun body.
10. The sandblasting nozzle according to claim 8, characterized in that, The nozzle (100) is welded to the connector (200).