Complex impeller overspeed test tool

Abstract

The utility model discloses a complex impeller overspeed test tool, a tool body comprises a first flattening part, a first supporting part, an extension part, a second supporting part, a second flattening part and a fixing part which are coaxially arranged and sequentially connected, and the first flattening part, the first supporting part, the extension part, the second supporting part, the second flattening part and the fixing part are integrally formed; the first supporting part and the second supporting part are matched with the inner diameter of the impeller, the outer diameter of the first supporting part and the outer diameter of the second supporting part are both larger than the outer diameter of the extending part, the outer diameter of the second flattening part is smaller than the outer diameter of the second supporting part, and the outer diameter of the fixing part is smaller than the outer diameter of the second flattening part. Positioning end face teeth are arranged on the end face, facing the second flattening part, of the first flattening part; threads are arranged on the peripheral face of the second flattening part, and a positioning block is connected to the second flattening part in a threaded mode. By means of the arrangement, the requirements for coaxiality and perpendicularity of the impeller and the tool body can be strictly met, eccentric installation of the impeller is prevented, and damage to the impeller body and too high vibration are prevented.

Description

Technical Field

[0001] The utility model relates to the field of impeller overspeed test equipment, in particular to a complex impeller overspeed test tool. Background Art

[0002] As technology continues to advance and turbine speeds and power continue to increase, the importance of impeller overspeed is also gradually increasing. To ensure the stability of the impeller during actual operation and to ensure that the impeller's deformation and quality are within acceptable ranges, steam turbine manufacturers need to conduct overspeed tests on the impeller. To simplify the overspeed testing process, they have designed an overspeed tooling.

[0003] The prior art with publication number CN212748273U discloses a tool for impeller overspeed test, which includes an impeller bolt, a locking nut, a locating pin and an overspeed core shaft. A locating hole is provided at one end of the overspeed core shaft, and external threads are provided at both ends of the impeller bolt. One end of the impeller bolt is installed in the locating hole of the overspeed core shaft by a threaded connection, and the other end of the impeller bolt is connected to the locking nut by a threaded connection; the locating pin is installed in the locating hole for circumferential positioning of the impeller and the overspeed core shaft; when performing the overspeed test, the impeller is mounted on the impeller bolt, and the boss on its lower end face extends into the locating hole of the overspeed core shaft; the locating hole and the locking nut cooperate to axially position the impeller.

[0004] In the existing technology, the impeller bolts, locking nuts, locating pins and overspeed core shaft of the tooling are all set separately, which requires high processing accuracy of each component of the tooling and high accuracy of tooling assembly, and is prone to fracture and deformation during high-speed testing of large impellers. Utility Model Content

[0005] In order to solve the problems in the prior art, the purpose of the present utility model is to provide a complex impeller overspeed test tool, which can not only ensure the high positioning accuracy of each part of the tool, but also ensure the coaxiality of the impeller and the tool, and the overall strength of the tool is also higher.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a complex impeller overspeed test fixture, comprising a fixture body for assembling the impeller, the fixture body comprising a first flattening portion, a first supporting portion, an extending portion, a second supporting portion, a second flattening portion and a fixing portion which are coaxially arranged and sequentially connected, the first flattening portion, the first supporting portion, the extending portion, the second supporting portion, the second flattening portion and the fixing portion being integrally formed; the first supporting portion and the second supporting portion are matched with the inner diameter of the impeller, and the outer diameter of the first supporting portion and the outer diameter of the second supporting portion are both larger than the outer diameter of the extending portion. The outer diameter of the second flattening part is smaller than the outer diameter of the second supporting part, and the outer diameter of the fixing part is smaller than the outer diameter of the second flattening part; a positioning end face tooth is provided on the end face of the first flattening part facing the second flattening part; a thread is provided on the outer circumferential surface of the second flattening part, and a positioning block is threadedly connected to the second flattening part; an inner hole is provided at the middle position of the impeller, the first supporting part and the second supporting part match the inner hole of the impeller, and the end plate of the impeller is provided with matching end face teeth, and the matching end face teeth match the positioning end face teeth on the first flattening part; tightening the positioning block can lock the impeller on the tooling body.

[0007] Preferably, the first flattening portion is provided with a matching groove on the end face of the positioning end face tooth, the matching groove is located on the inner side of the positioning end face tooth, and the first supporting portion extends into the matching groove.

[0008] Preferably, the first support portion and the second support portion are both interference fit with the inner hole of the impeller.

[0009] Preferably, the end surface of the positioning block facing the impeller is a precision-ground end surface, and the thread on the second flattened portion is a precision-turned thread.

[0010] Preferably, a plurality of mounting holes are provided on the end surface of the positioning block facing away from the impeller, and the plurality of mounting holes are evenly arranged around the inner hole of the positioning block.

[0011] Preferably, a positioning portion is protruded from the end surface of the first flattening portion facing away from the positioning end face teeth, and the positioning portion and the first flattening portion are coaxially arranged.

[0012] Preferably, a plurality of threaded holes are provided on the end surface of the first flattening portion where the positioning portion is provided, and the plurality of threaded holes are arranged around the positioning portion.

[0013] Preferably, a central positioning hole is provided on the end surface of the positioning portion facing away from the first flattening portion.

[0014] Preferably, the tool body is made of 40CrNiMoA alloy steel.

[0015] The beneficial effects of the technical solution of the present invention are as follows: the first flattening part and the impeller can be positioned and matched through the end face teeth, and the first support part, the second support part and the impeller body can be matched, thereby strictly ensuring the coaxiality and verticality requirements of the impeller and the tooling body, and preventing the impeller from being installed eccentrically, and preventing the strong centrifugal force of the overspeed test from causing the tooling parts to deform and form excessive displacement, damaging the impeller body and excessive vibration; the tooling body arranged in an integral form can ensure the positioning accuracy of each part on the tooling body, ensure the strength of the tooling body, and avoid deformation and fracture of the tooling during the overspeed test; since the part of the tooling body connected to the inner hole of the impeller needs to be precision-turned, the extension part can reduce the processing difficulty of the tooling body, avoid damage to the inner wall and support part of the impeller, and reduce the extended length of the tooling when the component is overspeeding through the extension part, ensuring successful overspeed dynamic balancing of the impeller and reducing the weight of the parts; by arranging a fixing part outside the second flattening part, preparation can be made for low-speed dynamic balancing of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the tooling structure Figure 1 ;

[0017] Figure 2 Schematic diagram of the tooling structure Figure 2 ;

[0018] Figure 3 Schematic diagram of the connection structure between the impeller and the tooling Figure 1 ;

[0019] Figure 4 Schematic diagram of the connection structure between the impeller and the tooling Figure 2 ;

[0020] Figure 5 Schematic diagram of the connection structure between the impeller and the tooling Figure 3 .

[0021] Reference numerals: 11, positioning portion; 111, threaded hole; 12, first flattening portion; 121, positioning end face tooth; 122, threaded hole; 13, first supporting portion; 14, extending portion; 15, second supporting portion; 16, second flattening portion; 17, fixing portion;

[0022] 2. Impeller; 21. Matching end face teeth;

[0023] 3. Positioning block; 31. Mounting hole. DETAILED DESCRIPTION

[0024] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0026] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more, unless expressly limited otherwise.

[0027] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature. Example

[0029] like Figures 1 to 5 The illustrated tooling for a complex impeller overspeed test includes a tooling body for assembling an impeller. The tooling body comprises a first flattening portion 12, a first support portion 13, an extension portion 14, a second support portion 15, a second flattening portion 16, and a fixing portion 17, which are coaxially arranged and sequentially connected. The first flattening portion 12, the first support portion 13, the extension portion 14, the second support portion 15, the second flattening portion 16, and the fixing portion 17 are integrally formed.

[0030] The first support portion 13 and the second support portion 15 match the inner diameter of the impeller 2. The outer diameters of the first support portion 13 and the second support portion 15 are both larger than the outer diameter of the extension portion 14. The outer diameter of the second flattened portion 16 is smaller than the outer diameter of the second support portion. The outer diameter of the fixing portion 17 is smaller than the outer diameter of the second flattened portion 16. The end surface of the first flattened portion 12 facing the second flattened portion 16 is provided with positioning end face teeth. The outer circumferential surface of the second flattened portion 16 is provided with threads, and the second flattened portion 16 is threadedly connected to the positioning block 3.

[0031] An inner hole is provided in the middle position of the impeller 2, the first support portion 13 and the second support portion 15 match the inner hole of the impeller 2, and the end plate of the impeller 2 is provided with matching end face teeth 21, which match the positioning end face teeth 121 on the first flattening portion 12; tightening the positioning block 3 can lock the impeller 2 on the tooling body.

[0032] With such arrangement, the first flattening portion 12 and the impeller 2 can be positioned and matched through the end face teeth, and the first support portion 13, the second support portion 15 and the body of the impeller 2 can be matched, thereby strictly ensuring the coaxiality and verticality requirements of the impeller 2 and the tooling body, and preventing the impeller 2 from being installed eccentrically, and preventing the strong centrifugal force of the overspeed test from causing the tooling parts to deform and form excessive displacement, thereby damaging the impeller 2 body and causing excessive vibration; the tooling body formed in one piece can ensure the positioning accuracy of each part on the tooling body; since the part of the tooling body that is connected to the inner hole of the impeller 2 requires precision turning, the extension portion 14 can reduce the processing difficulty of the tooling body, avoid damage to the inner wall and support portion of the impeller 2, and reduce the extended length of the tooling when the component is overspeeding through the extension portion 14, thereby ensuring the successful overspeed dynamic balance of the impeller 2 and reducing the weight of the part; by arranging the fixing portion 17 outside the second flattening portion 16, preparation can be made for the low-speed dynamic balancing of the part.

[0033] In this embodiment, Figure 3 and Figure 5 As shown, the first flattening portion 12 is provided with a matching groove on the end face of the positioning end face tooth 121, the matching groove is located inside the positioning end face tooth 121, and the first support portion 13 extends into the matching groove. This arrangement can effectively avoid interference between the impeller 2 and the first flattening portion 12.

[0034] In this embodiment, the first support portion 13 and the second support portion 15 are both interference fit with the inner hole of the impeller 2. This arrangement selects a reasonable interference fit, confirms the center of mass of the parts installation, ensures the rationality of the parts installation, and facilitates manual disassembly while ensuring the installation and overspeed tightness of the impeller 2.

[0035] In this embodiment, Figure 3 and Figure 5 As shown, the outer cylindricity of the first and second support portions 13, 15 is 0.003mm; the runout of the first and second support portions 13, 15 is 0.006mm; and the perpendicularity between the end faces and the outer circumference of the first and second support portions 13, 15 is 0.005mm. This arrangement ensures high-precision assembly of the impeller 2 and the fixture body, reducing the difficulty of subsequent dynamic balancing tests.

[0036] In this embodiment, the end surface of the positioning block 3 facing the impeller 2 is precision-ground, and the threads on the second flattening portion 16 are precision-machined. This arrangement allows the positioning block 3 to be tightened while simultaneously pressing against the impeller 2 using the precision-ground end surface, ensuring the flatness of the end surfaces of the positioning block 3 and the first flattening portion 12, and ensuring high verticality of the tooling center.

[0037] More preferably, Figure 5 As shown, the end surface of the positioning block 3 facing away from the impeller 2 is provided with a plurality of mounting holes 31, and the plurality of mounting holes 31 are evenly arranged around the inner hole of the positioning block 3. In this way, a counterweight can be added to the positioning block 3 to ensure the stability of the overspeed test.

[0038] In this embodiment, a positioning portion 11 is protruded from the end face of the first flattening portion 12 facing away from the positioning end face teeth 121. The positioning portion 11 and the first flattening portion 12 are coaxially arranged. In this arrangement, the positioning portion 11 cooperates with the stopper of the overspeed device, thereby enabling high-precision centering of the tooling body and the overspeed device.

[0039] Further preferably, a plurality of threaded holes 122 are provided on the end surface of the first flattening portion 12 on which the positioning portion 11 is provided, and the plurality of threaded holes 122 are arranged around the positioning portion 11. In this way, the plurality of threaded holes 122 processed on the first flattening portion 12 can be used to connect with the overspeed equipment hoisting rod.

[0040] Further preferably, a central positioning hole 111 is provided on the end surface of the positioning portion 11 facing away from the first flattening portion 12 .

[0041] In this embodiment, the material of the tool body is 40CrNiMoA alloy steel, which requires a tempering requirement of 320-370HB; this setting makes the tool body have high strength and high toughness, which can improve the overall mechanical properties of the tool parts and prevent the tool parts from having problems such as insufficient strength, breakage, and bending during overspeeding.

[0042] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0043] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A complex impeller overspeed test fixture, characterized by: The tool body comprises a tool body for assembling an impeller, the tool body comprising a first flattening portion (12), a first supporting portion (13), an extending portion (14), a second supporting portion (15), a second flattening portion (16), and a fixing portion (17) which are coaxially arranged and sequentially connected, wherein the first flattening portion (12), the first supporting portion (13), the extending portion (14), the second supporting portion (15), the second flattening portion (16), and the fixing portion (17) are integrally formed; The first support portion (13) and the second support portion (15) match the inner diameter of the impeller (2); the outer diameter of the first support portion (13) and the outer diameter of the second support portion (15) are both larger than the outer diameter of the extension portion (14); the outer diameter of the second flattening portion (16) is smaller than the outer diameter of the second support portion; and the outer diameter of the fixing portion (17) is smaller than the outer diameter of the second flattening portion (16); a positioning end face tooth is provided on the end face of the first flattening portion (12) facing the second flattening portion (16); a thread is provided on the outer peripheral surface of the second flattening portion (16), and a positioning block (3) is threadedly connected to the second flattening portion (16); An inner hole is provided at the middle position of the impeller (2), the first support portion (13) and the second support portion (15) match the inner hole of the impeller (2), and the end plate of the impeller (2) is provided with matching end face teeth (21), which match the positioning end face teeth (121) on the first flattening portion (12); and tightening the positioning block (3) can lock the impeller (2) on the tooling body.

2. The complex impeller overspeed test fixture according to claim 1, characterized in that: The first flattening portion (12) is provided with a matching groove on the end face of the positioning end face tooth (121), the matching groove is located inside the positioning end face tooth (121), and the first supporting portion (13) extends into the matching groove.

3. The complex impeller overspeed test fixture according to claim 1, characterized in that: The first support portion (13) and the second support portion (15) are both interference-fitted with the inner hole of the impeller (2).

4. The complex impeller overspeed test fixture according to claim 1, characterized in that: The end surface of the positioning block (3) facing the impeller (2) is a finely ground end surface, and the thread on the second flattened portion (16) is a finely turned thread.

5. The complex impeller overspeed test fixture according to claim 1, characterized in that: A plurality of mounting holes (31) are provided on the end surface of the positioning block (3) facing away from the impeller (2), and the plurality of mounting holes (31) are evenly arranged around the inner hole of the positioning block (3).

6. The complex impeller overspeed test fixture according to claim 1, characterized in that: A positioning portion (11) is protruded on the end surface of the first flattening portion (12) facing away from the positioning end face teeth (121), and the positioning portion (11) and the first flattening portion (12) are coaxially arranged.

7. The complex impeller overspeed test fixture according to claim 1, characterized in that: A plurality of threaded holes (122) are provided on the end surface of the first flattening portion (12) on which the positioning portion (11) is provided, and the plurality of threaded holes (122) are arranged around the positioning portion (11).

8. The complex impeller overspeed test fixture according to claim 1, characterized in that: A central positioning hole (111) is provided on the end surface of the positioning portion (11) facing away from the first flattening portion (12).

9. The complex impeller overspeed test fixture according to claim 1, characterized in that: The tool body is made of 40CrNiMoA alloy steel.

Images