Device for aligning plug welding groove and blade of plug welding impeller of centrifugal compressor

Abstract

A device for aligning plug welding grooves and blades of a plug welding impeller of a centrifugal compressor is used for aligning a plurality of blades on a wheel cover with a plurality of plug welding grooves on a wheel disc, the wheel cover comprises a wheel cover outer circular ring belt and is annular, and the blades on the wheel cover are milled on the wheel cover in an annular array by taking the center of the wheel cover outer circular ring belt as a shaft. One end of each blade is connected with the inner ring surface of the outer ring belt of the wheel cover; two wheel cover pin holes are formed in the wheel cover outer circular ring belt in the height direction of the wheel cover outer circular ring belt; the center point of the wheel disc coincides with the center point of the wheel cover, two wheel disc pin holes penetrating through the wheel disc are formed in the wheel disc in the height direction of the wheel disc, the machining coordinates of the two wheel disc pin holes are consistent with the machining coordinates of the two wheel cover pin holes, so that hole channels of the wheel disc pin holes are aligned with hole channels of the wheel cover pin holes, and the wheel disc and the wheel cover which are milled through the same coordinate system are buckled. Alignment of the contour molded line of the plug welding groove and the contour molded line of the blade is guaranteed, the accuracy degree of the alignment process of the plug welding groove and the blade is improved, and the machining quality of the impeller is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of compressor processing and repair, and specifically relates to an alignment device for plug welding grooves and blades of a centrifugal compressor impeller. Background Art

[0002] The impeller of a centrifugal compressor is a component that does work on the gas. For an impeller with a small outlet height, a manufacturing method is to mill plug welding grooves on the wheel disc and mill blades on the wheel cover, and then weld the wheel cover and the wheel disc into a whole by plug welding. Before the impeller is assembled and welded, the wheel disc and the wheel cover need to be aligned to ensure that the contour lines of the plug welding grooves on the wheel disc and the contour lines of the blades on the wheel cover are exactly aligned during the assembly welding.

[0003] The conventional alignment method is to place the wheel cover on the workbench plane with the blades of the wheel cover facing up, buckle the wheel disc on the blades of the wheel cover, and then rotate the wheel disc to visually observe whether the contour lines of the plug welding grooves on the wheel disc and the contour lines of the blades on the wheel cover are aligned. After visual alignment, the welding process is carried out.

[0004] Since there is often a large gap on one side and a small gap on the other side within the contour line area during the alignment process, during the assembly welding, due to the uneven weld gap, the wire distribution filling is uneven, and the local heat absorption is different, the impeller may have problems such as local deformation, affecting the processing quality of the entire impeller. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an alignment device for plug welding grooves and blades of a centrifugal compressor impeller to avoid the problems of inaccurate alignment between the plug welding grooves on the wheel disc and the blades on the wheel cover and uneven weld gaps.

[0006] The technical solution of the utility model is as follows:[[]]

[0007] An alignment device for plug welding grooves and blades of a centrifugal compressor impeller is used to align multiple blades on the wheel cover with multiple plug welding grooves on the wheel disc. The wheel cover includes an outer ring belt of the wheel cover, and the outer ring belt of the wheel cover is annular. Multiple blades on the wheel cover are milled on the wheel cover in a circumferential array with the center of the outer ring belt of the wheel cover as the axis, and one end of each blade is connected to the inner ring surface of the outer ring belt of the wheel cover; two wheel cover pin holes are opened on the outer ring belt of the wheel cover along the height direction of the outer ring belt of the wheel cover;

[0008] The center point of the wheel disc coincides with the center point of the wheel cover. Two wheel disc pin holes penetrating the wheel disc are opened on the wheel disc along its height direction. The processing coordinates of the two wheel disc pin holes are the same as those of the two wheel cover pin holes, so that the holes of the wheel disc pin holes are aligned with the holes of the wheel cover pin holes. The wheel disc is buckled and connected with the wheel cover and fixed by multiple pins, and each pin passes through the holes of the wheel disc pin holes aligned with the wheel cover pin holes.

[0009] The contour line of the plug weld groove is called the plug weld groove contour line, and the contour line of the blade is called the blade contour line. By fitting the wheel cover and the wheel disc arranged as above, the gap between the plug weld groove contour line and the blade contour line can be ensured to be uniform.

[0010] Furthermore, the two wheel cover pin holes are symmetrically arranged.

[0011] Furthermore, the length dimension of the pin is greater than the sum of the depths of the wheel cover pin hole and the wheel disc pin hole.

[0012] Furthermore, the depth of the wheel cover pin hole is greater than or equal to 3 times the diameter dimension of the wheel cover pin hole.

[0013] Furthermore, a circumferential groove is provided on the outer circle of the wheel cover, and the circumferential groove is indented inside the outer circle. When machining the blade shape on a machine tool, a pressing plate is fixed in the circumferential groove to press and fix the wheel cover on the machine tool workbench.

[0014] Furthermore, the cross-sectional shape of the plug weld groove is a funnel shape with a larger upper part and a smaller lower part.

[0015] Furthermore, a narrow groove is provided at the bottom of the plug weld groove, and the groove width of the narrow groove is smaller than the thickness of the blade.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] Before assembling and welding the impeller, the wheel disc and the wheel cover milled in the same coordinate system of the present utility model are fitted, and pins are inserted into the wheel disc pin holes and the wheel cover pin holes machined in the same coordinate system, ensuring the alignment of the plug weld groove contour line on the wheel disc and the blade contour line on the wheel cover. It avoids the problems of inaccurate alignment between the plug weld groove on the wheel disc and the blade on the wheel cover, uneven weld gap, uneven distribution and filling of welding wires, and different local heating sizes during impeller assembly welding. At the same time, through the uniform welding gap, it avoids the problem of possible local deformation of the impeller during assembly welding. It not only improves the accuracy of the alignment process of the plug weld groove and the blade, ensures the machining quality of the impeller, but also saves the alignment time and improves the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of milling the wheel cover before welding the impeller of the present utility model.

[0019] Figure 2 is Figure 1 the schematic cross-sectional structure diagram at A-A in

[0020] Figure 3 It is a schematic diagram of milling the wheel disc before welding the impeller of the present utility model.

[0021] Figure 4 is Figure 3Schematic diagram of the C-C cross-sectional structure.

[0022] Figure 5 Schematic diagram of the front wheel cover welded to the impeller and the wheel disc buckled.

[0023] Figure 6 Schematic diagram of the profile line of the plug weld groove and the profile line of the blade.

[0024] Figure 7 For Figure 6 Schematic diagram of the D-D cross-sectional structure.

[0025] Among them, 1. wheel cover, 2. blade, 3. outer ring belt of the wheel cover, 4. process pin hole of the wheel cover, 5. wheel disc, 6. plug weld groove, 7. process pin hole of the wheel disc, 8. process pin, 9. profile line of the plug weld groove, 10. profile line of the blade, 11. annular groove, 12. narrow groove. Specific implementation manners

[0026] The following Figures 1 to 7 is combined with

[0027] to describe the specific implementation manners of the present utility model in detail. In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model.

[0028] Embodiment

[0029] As Figures 1 to 7 shown, a centering device for the plug weld groove and the blade of a centrifugal compressor plug weld impeller is used to align multiple blades 2 on the wheel cover 1 with multiple plug weld grooves 6 on the wheel disc 5. As Figure 1 and Figure 2 shown, the wheel cover 1 includes an outer ring belt 3 of the wheel cover. The outer ring belt 3 of the wheel cover is annular. Multiple blades 2 on the wheel cover 1 are milled on the wheel cover 1 in an annular array with the center of the outer ring belt 3 of the wheel cover as the axis, and one end of each blade 2 is connected to the inner ring surface of the outer ring belt 3 of the wheel cover; two wheel cover pin holes 4 are opened on the outer ring belt 3 of the wheel cover along the height direction of the outer ring belt 3 of the wheel cover;

[0030] As Figure 3 , Figure 4 and Figure 5 shown, the center point of the roulette wheel 5 coincides with the center point of the wheel cover 1. Two roulette wheel pin holes 7 penetrating the roulette wheel 5 are opened along the height direction of the roulette wheel 5. The machining coordinates of the two roulette wheel pin holes 7 are the same as those of the two wheel cover pin holes 4, so that the holes of the roulette wheel pin holes 7 are aligned with the holes of the wheel cover pin holes 4. The roulette wheel 5 and the wheel cover 1 are snap-connected and fixed by a plurality of pins 8. Each pin 8 passes through the hole where the roulette wheel pin hole 7 is aligned with the wheel cover pin hole 4. The plug weld groove 6 is milled on the roulette wheel 5 according to the milling coordinates and blade shape data of the blade 2, so that the structure of each plug weld groove 6 matches the structure of each blade 2 and the positions correspond to each other.

[0031] As Figure 6 shown, the contour line of the plug weld groove 6 is called the plug weld groove contour line 9, and the contour line of the blade 2 is called the blade contour line 10. After the above-mentioned wheel cover and roulette wheel are snapped together, it is ensured that the gap between the plug weld groove contour line 9 and the blade contour line 10 is uniform, ensuring the sealing performance and hydrodynamic characteristics during their cooperation, reducing the hydrodynamic loss, and improving the compressor efficiency.

[0032] As Figure 1 shown, the two wheel cover pin holes 4 are symmetrically arranged. Similarly, the two roulette wheel pin holes 7 are also symmetrically arranged. Through the two symmetrically arranged roulette wheel pin holes 7 and the two symmetrically arranged wheel cover pin holes 4, the fixing stability of the wheel cover 1 and the roulette wheel 5 is improved.

[0033] As Figure 5 shown, the length dimension of the pin 8 is greater than the sum of the depths of the wheel cover pin hole 4 and the roulette wheel pin hole 7, so as to ensure that the pin 8 can be completely inserted and fixed in the wheel cover pin hole 4 and the roulette wheel pin hole 7.

[0034] As Figure 2 shown, the depth of the wheel cover pin hole 4 is greater than or equal to 3 times the diameter dimension of the wheel cover pin hole 4, ensuring that there is enough contact area between the wheel cover pin hole 4 and the pin 8, thereby improving the reliability of the connection.

[0035] As Figure 5 shown, a circumferential groove is provided on the outer circle of the wheel cover 1, and the circumferential groove is indented inside the outer circle. When machining the blade shape on the machine tool, a pressing plate is fixed in the circumferential groove to press and fix the wheel cover on the machine tool workbench.

[0036] As Figure 4 shown and Figure 7As shown, the plug weld groove 6 has a funnel-shaped cross-section with a larger upper part and a smaller lower part. The funnel-shaped plug weld groove 6 can better adapt to the flow of filler metal during the welding process, ensuring the uniformity and density of the weld seam. A narrow groove is provided at the bottom of the plug weld groove 6. The design of the narrow groove helps to reduce defects such as porosity and slag inclusion during the welding process, improving the welding quality. The width of the narrow groove is smaller than the thickness of the blade 2. By precisely controlling the width of the narrow groove, the strength of the welded joint is effectively guaranteed, thereby improving the stability and reliability of the overall structure.

[0037] The manufacturing process of the alignment device in this embodiment is as follows:

[0038] The blades 2 on the wheel cover 1 are prepared by milling on a machine tool. When milling the profile of the blades 2 on the wheel cover 1, a 5-mm-wide outer ring belt 3 of the wheel cover is left on the outer circle of the wheel cover 1, and two wheel cover pin holes 4 are machined along the thickness direction of the outer ring belt 3 of the wheel cover.

[0039] As Figure 1 and Figure 3 shown, when milling the plug weld groove 6 on the wheel disc 5, the same coordinate system as that of the wheel cover 1 is adopted, and the plug weld groove 6 uses the same blade profile data. For example, the blade thickness center line data used in numerical control programming is the same as the center line data of the plug weld groove. Two wheel disc pin holes 7 are machined at the same positions as the wheel cover pin holes 4 to ensure that the coordinate values of the wheel disc pin holes 7 and the wheel cover pin holes 4 are the same. For example, as Figure 1 shown, when machining the wheel cover 1, the center point coordinate system is (0, 0), and the coordinates of the two wheel cover pin holes 4 are (B, 0) and (-B, 0) respectively.

[0040] The wheel disc 5 is buckled on the wheel cover 1, and a pin 8 is inserted into the aligned holes of the wheel cover pin holes 4 and the wheel disc pin holes 7 to ensure that the contour line 9 of the plug weld groove on the wheel disc is aligned with the contour line 10 of the blade on the wheel cover.

[0041] After the plug weld groove 6 is aligned with the blade 2, the gaps on both sides between the contour line 9 of the plug weld groove and the contour line 10 of the blade are uniform, that is, Figure 4 as shown in

[0042] The above discloses only several preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A plug welding groove and blade alignment device for a plug welding impeller of a centrifugal compressor, used for aligning a plurality of blades (2) on a wheel cover (1) with a plurality of plug welding grooves (6) on a wheel disc (5), characterized in that: The wheel cover (1) comprises a wheel cover outer circular ring band (3), the wheel cover outer circular ring band (3) is annular, a plurality of blades (2) on the wheel cover (1) are milled on the wheel cover (1) in an annular array with the center of the wheel cover outer circular ring band (3) as the axis, and one end of each blade (2) is connected to the inner annular surface of the wheel cover outer circular ring band (3); two wheel cover pin holes (4) are provided on the wheel cover outer circular ring band (3) along the height direction of the wheel cover outer circular ring band (3); The center point of the wheel disc (5) coincides with the center point of the wheel cover (1); two wheel disc pin holes (7) penetrating the wheel disc (5) are provided on the wheel disc (5) along its height direction; the processing coordinates of the two wheel disc pin holes (7) and the two wheel cover pin holes (4) are consistent, so that the hole channels of the wheel disc pin holes (7) are aligned with the hole channels of the wheel cover pin holes (4); the wheel disc (5) is snap-fittedly connected to the wheel cover (1) and fixed by a plurality of pins (8); each pin (8) passes through the hole channel of the wheel disc pin hole (7) aligned with the wheel cover pin hole (4).

2. A device for aligning plug welding grooves and blades of a plug welding impeller of a centrifugal compressor according to claim 1, characterized in that: The two wheel cover pin holes (4) are symmetrically arranged.

3. The device for aligning the plug welding groove and blades of a plug welding impeller of a centrifugal compressor according to claim 1, characterized in that: The length of the pin (8) is greater than the sum of the depth of the wheel cover pin hole (4) and the depth of the wheel disc pin hole (7).

4. The device for aligning the plug welding groove and blades of a plug welding impeller of a centrifugal compressor according to claim 1, characterized in that: The depth of the wheel cover pin hole (4) is greater than or equal to 3 times the diameter of the wheel cover pin hole (4).

5. The device for aligning the plug welding groove and blades of a plug welding impeller of a centrifugal compressor according to claim 1, characterized in that: The outer circle of the wheel cover (1) is provided with a circular annular groove (11), and the circular annular groove (11) is indented inside the outer circle.

6. The device for aligning the plug welding groove and blades of a plug welding impeller of a centrifugal compressor according to claim 1, characterized in that: The cross-sectional shape of the plug welding groove (6) is a funnel shape that is larger at the top and smaller at the bottom.

7. A device for aligning plug welding grooves and blades of a plug welding impeller of a centrifugal compressor according to claim 6, characterized in that: A narrow groove is provided at the bottom of the plug welding groove (6), and the groove width of the narrow groove is smaller than the thickness of the blade (2).

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