Clamp assembly
By designing the combination of center, outer ring and inner ring fixtures, the problem of instability of impeller welding in the prior art is solved, and the stability and cost-effectiveness of impeller welding quality are achieved.
Patent Information
- Application Number
- CN202421669927.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-07-15
AI Technical Summary
In the prior art, welding fixtures for centrifugal compressor impellers cannot effectively fix the inner ring and intermediate position of the impeller, resulting in unstable welding quality, especially when large diameter impellers.
A fixture assembly is designed, including a center fixture, an outer ring fixture and an inner ring fixture. It is clamped from the top and bottom through the center fixture, and the outer ring fixture is clamped from the periphery. The inner ring fixture is located between the center and the periphery to ensure that the workpiece clearance is within the range of process requirements and stable clamping is achieved through connecting rods and threaded connections.
It effectively reduces the impeller assembly gap, ensures the stability and consistency of welding quality, and is suitable for small-diameter and large-diameter impeller welding, reducing production costs.
Smart Images
Figure CN223172193U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a fixture assembly for clamping multiple workpieces. Specifically, during the vacuum welding of an impeller of a centrifugal compressor, the fixture assembly is used to clamp a disk and a cover to be welded together. Background Art
[0002] Centrifugal compressors are mainly applied in fields such as oil, natural gas, methanol, and ammonia transportation / storage. The most important component in the compressor is the impeller.
[0003] As Figure 1 、 Figure 2 and Figure 3 shown, the impeller 2 is composed of a disk 4 and a cover 3, and the disk 4 and the cover 3 are connected by welding. Specifically, the blades 5 on the disk 4 are welded to the inner surface of the cover 3 to realize the connection between the disk 4 and the cover 3.
[0004] Vacuum brazing is a common welding method for impeller welding. During vacuum brazing, a special fixture is required to fix the disk 4 and the cover 3 to ensure that the assembly gap between the disk 4 and the cover 3 is within the range required by the brazing process. In the prior art, there is a problem that the assembly gap between the disk and the cover is too large during brazing.
[0005] Currently, the common fixture for clamping the disk and the cover during welding consists of a U-shaped clamp and a set of bolts. As Figure 4 shown, before welding, the fixture is clamped on the outer ring of the impeller, and after assembling the disk and the cover, welding is performed. When the conventional U-shaped clamp tooling is used to weld large-diameter impellers, since it can only fix the outer ring of the impeller, it is difficult to ensure the welding quality of the inner ring position and the middle position of the impeller, resulting in various defects in the above two areas after welding and unable to ensure the stability of the welding quality. Utility Model Content
[0006] In view of this, the present utility model provides a fixture assembly that can clamp the central part and the peripheral part of the impeller during welding, overcome the problem of excessive assembly gap between the disk and the cover of the impeller, and ensure stable welding quality.
[0007] The fixture assembly according to the present application is used to clamp multiple workpieces. The workpieces include a first workpiece located at the topmost and a second workpiece located at the bottommost. Among them, the fixture assembly includes: a central fixture that penetrates the central part of multiple workpieces and clamps multiple workpieces from the top of the first workpiece and the bottom of the second workpiece; and an outer ring fixture that clamps multiple workpieces from the periphery of the first workpiece and the second workpiece.
[0008] The fixture assembly clamps multiple workpieces both at the central part and the peripheral part of the multiple workpieces, reducing the assembly gap, ensuring that the assembly gap between the workpieces is within the range required by the process, and ensuring that the assembly gap at the contact positions (i.e., the positions to be welded) of the multiple workpieces from the central region to the peripheral region is in a stable state.
[0009] Further, the fixture assembly further includes: an inner ring fixture, located between the central fixture and the outer ring fixture, and clamping the multiple workpieces at a position between the central part and the periphery.
[0010] Setting the inner ring fixture between the central part and the periphery further reduces the assembly gap of the multiple workpieces and improves the stability of the assembly gap.
[0011] Further, the central fixture includes: a pressure plate, disposed on the top of the first workpiece; a base, disposed on the bottom of the second workpiece; and a connecting rod, passing through the central part of the multiple workpieces and fastened to the pressure plate and the base.
[0012] The pressure plate and the base are connected by the connecting rod to form the central fixture, ensuring that the multiple workpieces are firmly clamped at the central position, with a simple structure and easy to manufacture.
[0013] Further, the pressure plate has a through hole, the base has a first threaded hole, both ends of the connecting rod have threads, the second end of the connecting rod is screwed into the first threaded hole, and the first end of the connecting rod passes through the through hole and is fastened to the pressure plate by a nut.
[0014] The connecting rod with threads at both ends connects the pressure plate and the base together. One end is directly screwed into the base, and the pressure of the pressure plate pressing on the workpiece can be adjusted by screwing the nut at the other end, ensuring sufficient clamping degree, and with a simple structure and convenient for disassembly.
[0015] Further, in the state where the outer ring fixture clamps the multiple workpieces, the outer ring fixture includes: a U-shaped clamp, having a first branch, a second branch, and an intermediate part connecting the first branch and the second branch. The first branch is located above the pressure plate and abuts against the pressure plate, and the first branch has a second threaded hole. The second branch is located below the second workpiece and abuts against the second workpiece; and a first screw rod, screwed through the second threaded hole and abutting against the first workpiece.
[0016] Through the cooperation of the U-shaped clamp and the first screw rod, the multiple workpieces are clamped from the periphery of the workpiece, and the clamping degree can be adjusted by screwing the first screw rod, with a simple structure and convenient for disassembly.
[0017] Further, the pressure plate includes a third hole at the periphery of the pressure plate. In the state where the outer ring fixture clamps the multiple workpieces, the third hole is aligned with the second threaded hole, and the first screw rod passes through the second threaded hole and the third hole in sequence to abut against the first workpiece.
[0018] The first screw passes through the pressing plate and the U-shaped clamp to abut against the first workpiece, ensuring the stability of the U-shaped clamp during clamping.
[0019] Further, the first workpiece is a columnar shape with a gradually increasing diameter from top to bottom. In the state where the inner ring fixture clamps multiple workpieces, the inner ring fixture includes: a pressing ring sleeved on the first workpiece and located below the pressing plate, and the pressing plate further includes a fourth threaded hole which is closer to the center of the pressing plate than the third hole; and a second screw, the second screw passes through the fourth threaded hole and abuts against the pressing ring.
[0020] The second screw passes through the pressing plate and abuts against the pressing ring. Since the pressing ring is sleeved on the first workpiece, the pressure applied by the second screw is evenly distributed on the pressing ring, and then evenly distributed on the first workpiece, thereby ensuring the stability of clamping.
[0021] Further, the number of the outer ring fixtures is the same as that of the second screws, and both are multiple.
[0022] The number of the second screws of the outer ring fixture and the inner ring fixture is multiple, and they are evenly clamped around the workpiece, improving the stability of clamping.
[0023] Further, the first workpiece is the hub of the impeller of a centrifugal compressor, and the second workpiece is the disk of the impeller.
[0024] Further, the positions of the outer ring fixtures and the second screws in the circumferential direction correspond to each other; and / or the positions of the outer ring fixtures and the second screws in the circumferential direction correspond to the positions of the blades of the impeller in the circumferential direction.
[0025] The outer ring fixture and the inner ring fixture are provided at the position of each blade, reducing the assembly gap between the blade and the hub and ensuring the stability of the assembly gap. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The schematic drawings forming a part of this application are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an improper limitation to this application. In the drawings:
[0027] Figure 1 is a three-dimensional view of the impeller of a centrifugal compressor in the prior art.
[0028] Figure 2 is a three-dimensional exploded schematic view of the impeller in the prior art.
[0029] Figure 3 is a schematic cross-sectional view of the impeller in the prior art.
[0030] Figure 4 is a schematic view of the fixture in the prior art.
[0031] Figure 5 A perspective view of the fixture assembly of the present application clamped on the impeller.
[0032] Figure 6 A perspective view of the pressure plate of the present application.
[0033] Figure 7 A perspective view of the base of the present application.
[0034] Figure 8 A perspective view of the connecting rod and nut of the present application.
[0035] Figure 9 A perspective view of the second screw of the present application.
[0036] Figure 10 A perspective view of the pressure ring of the present application.
[0037] Figure 11 A perspective view of the outer ring fixture of the present application.
[0038] Among them, the reference numerals are as follows:
[0039] W1, the first workpiece
[0040] W2, the second workpiece
[0041] 1, the fixture assembly
[0042] 2, the impeller
[0043] 3, the wheel cover
[0044] 4, the wheel disc
[0045] 5, the blade
[0046] 10, the center fixture
[0047] 11, the pressure plate
[0048] 12, the base
[0049] 13, the connecting rod
[0050] 14, the through hole
[0051] 15, the first threaded hole
[0052] 16, the nut
[0053] 17, the third hole
[0054] 18, the fourth threaded hole
[0055] 20, the outer ring fixture
[0056] 21, the first screw
[0057] 22, the U-shaped clamp
[0058] 23. First branch
[0059] 24. Second branch
[0060] 25. Middle part
[0061] 26. Second threaded hole
[0062] 30. Inner ring fixture
[0063] 31. Pressure ring
[0064] 32. Second screw Detailed implementation mode
[0065] To make the objectives, technical solutions and advantages of the present utility model clearer, the following examples are given to further elaborate on the present utility model in detail.
[0066] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.
[0067] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.
[0068] Figures 5 to 11 The fixture assembly of the present application is shown, which is used to clamp a plurality of workpieces. The workpieces include a first workpiece W1 located at the topmost and a second workpiece W2 located at the bottommost. Specifically, the first workpiece W1 can be the hub 3 of the impeller 2 of a centrifugal compressor, and the second workpiece W2 can be the disk 4 of the impeller 2. As Figures 1 to 3 shown, a plurality of blades 5 are provided on the disk 4.
[0069] In this embodiment, the plurality of workpieces are workpieces with a central opening. For example, both the disk 4 and the hub 3 of the impeller 2 have a central opening.
[0070] The fixture assembly 1 can include a central fixture 10 and an outer ring fixture 20. The central fixture 10 passes through the central part of the plurality of workpieces and clamps the plurality of workpieces from the top of the first workpiece W1 and the bottom of the second workpiece W2, and the outer ring fixture 20 clamps the plurality of workpieces from the peripheries of the first workpiece W1 and the second workpiece W2.
[0071] The fixture assembly 1 may further include an inner ring fixture 30 which is located between the central fixture and the outer ring fixture and clamps a plurality of workpieces at a position between the central portion and the periphery.
[0072] Clamping a plurality of workpieces by the central fixture 10, the outer ring fixture 20 and the inner ring fixture 30 ensures the minimization of the gaps between the workpieces and guarantees the stability of the gaps.
[0073] As Figure 6 , Figure 7 and Figure 8 shown, the central fixture 10 includes: a pressure plate 11 which is arranged on the top of the first workpiece W1; a base 12 which is arranged at the bottom of the second workpiece W2; and a connecting rod 13 which penetrates through the central portions of a plurality of workpieces and is fastened to the pressure plate 11 and the base 12.
[0074] The pressure plate 11 has a through hole 14, the base 12 has a first threaded hole 15, threads are provided at both ends of the connecting rod 13, the connecting rod 13 is screwed into the first threaded hole 15 at the second end, and the first end of the connecting rod 13 passes through the through hole 14 and is fastened to the pressure plate 11 by a nut 16.
[0075] When assembling the central fixture 10 onto a plurality of workpieces, the pressure plate 11 presses on the top of the first workpiece W1. By screwing the nut 16, the pressure plate 11 can be fastened to the first workpiece W1, and the magnitude of the pressing force can be adjusted.
[0076] In addition, as Figure 6 shown, the through hole 14 is arranged at the central position of the pressure plate 11. The pressure plate 11 further includes two circles of apertures at the periphery, that is, a third hole 17 located at the outermost circle in the radial direction and a fourth threaded hole 18 located between the third hole 17 and the through hole 14. The third hole 17 and the fourth threaded hole 18 will be described in detail below. The third hole 17 cooperates with the outer ring fixture 20, while the fourth threaded hole 18 cooperates with the inner ring fixture 30.
[0077] As Figure 11 shown, the outer ring fixture 20 includes a U-shaped clamp 22 and a first screw 21. The U-shaped clamp 22 has a first branch 23, a second branch 24 and an intermediate portion 25 connecting the first branch 23 and the second branch 24. When assembled onto a plurality of workpieces, the first branch 23 is located above the pressure plate 11 and abuts against the pressure plate 11, and the first branch 23 has a second threaded hole 26. The second branch 24 is located below the second workpiece W2 and abuts against the second workpiece W2.
[0078] The first screw 21 is screwed through the second threaded hole 26 and abuts against the first workpiece W1.
[0079] As Figure 5As shown, the pressing plate 11 includes a third hole 17 located at the periphery of the pressing plate 11. The third hole 17 is aligned with the second threaded hole 26. The first screw 21 sequentially passes through the second threaded hole 26 and the third hole 17 to abut against the first workpiece W1. The third hole 17 can be a through hole or a threaded hole.
[0080] The first workpiece W1 is in the shape of a column with a gradually increasing diameter from top to bottom, such as Figure 1 the wheel cover 3 shown.
[0081] As Figure 9 and Figure 10 shown, the inner ring fixture 30 includes a pressing ring 31 and a second screw 32.
[0082] The pressing ring 31 is sleeved on the first workpiece W1 (such as the wheel cover 3) and is located below the pressing plate 11. As mentioned above, the pressing plate 11 further includes a fourth threaded hole 18, and the fourth threaded hole 18 is closer to the center of the pressing plate 11 than the third hole 17. The second screw 32 passes through the fourth threaded hole 18 and abuts against the pressing ring 31.
[0083] As Figure 5 shown, the number of the outer ring fixtures 20 is the same as that of the second screws 32, and both are multiple. Specifically, the number of the outer ring fixtures 20 and the second screws 32 is the same as the number of the blades 5 of the impeller 2. The positions of the outer ring fixtures 20 and the second screws 32 in the circumferential direction correspond to each other. The positions of the outer ring fixtures 20 and the second screws 32 in the circumferential direction correspond to the positions of the blades 5 of the impeller 2 in the circumferential direction.
[0084] The specific assembly process of the fixture assembly of the present application will be described in detail below.
[0085] First, prepare the base 12, screw the connecting rod 13 into the first threaded hole 15 of the base 12, and then place the hub 4 and the wheel cover 3 of the impeller 2 on the base 12. The connecting rod 13 passes through the central opening of the impeller 2.
[0086] Then place the pressing ring 31 on the wheel cover 3 of the impeller.
[0087] Then pass the pressing plate 11 through the connecting rod 13 and place it on the wheel cover 3. Rotate the pressing plate 11 to align the third hole 17 and the fourth threaded hole 18 thereon with the position of the blade, and then tighten and fix the nut 16 on the connecting rod 13.
[0088] Screw the second screw 32 of the inner ring fixture 30 through the fourth threaded hole 18 until it abuts against the pressing ring 31.
[0089] Finally, clamp and fix the outer ring fixtures 20 on the wheel cover 3 and the hub 4 of the impeller 2 through the corresponding third holes 17.
[0090] The fixture assembly of the present application has wide applicability and is suitable for both the welding of impellers with small diameters and the welding of impellers with large diameters. In addition, the structure of the present application is modular and is mainly divided into a central fixture, an outer ring fixture, and an inner ring fixture. The fixture assembly is divided into three modules, and the required modules can be selected according to needs during production. For example, when the impeller diameter is small or the blade curvature is relatively gentle, the fitting of the welding surface is good, and the inner ring fixture can be not used, thus saving the cost of the fixture and reducing the production cost.
[0091] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.
Claims
1. A fixture assembly for clamping a plurality of workpieces, the workpieces including a first workpiece (W1) located at the uppermost position and a second workpiece (W2) located at the lowermost position, characterized in that, The fixture assembly (1) includes: a central fixture (10) that passes through the central portions of the plurality of workpieces and clamps the plurality of workpieces from the top of the first workpiece (W1) and the bottom of the second workpiece (W2); and an outer-ring fixture (20) that clamps the plurality of workpieces from the peripheries of the first workpiece (W1) and the second workpiece (W2).
2. The fixture assembly according to claim 1, wherein The fixture assembly (1) further includes: an inner-ring fixture (30) that is located between the central fixture and the outer-ring fixture and clamps the plurality of workpieces at a position between the central portion and the periphery.
3. The jig assembly according to claim 2, wherein, The central fixture (10) includes: a pressing plate (11) provided on the top of the first workpiece (W1); a base (12) provided on the bottom of the second workpiece (W2); and a connecting rod (13) that passes through the central portions of the plurality of workpieces and is fastened to the pressing plate (11) and the base (12).
4. The jig assembly according to claim 3, wherein, The pressing plate (11) has a through hole (14), the base (12) has a first threaded hole (15), both ends of the connecting rod (13) have threads, the connecting rod (13) is screwed to the first threaded hole (15) at the second end, and the first end of the connecting rod (13) passes through the through hole (14) and is fastened to the pressing plate (11) by a nut (16).
5. The jig assembly according to claim 3, wherein, In a state where the outer-ring fixture (20) clamps the plurality of workpieces, the outer-ring fixture (20) includes: a U-shaped clamp (22) having a first branch (23), a second branch (24), and an intermediate portion (25) connecting the first branch (23) and the second branch (24), the first branch (23) being located above the pressing plate (11) and abutting against the pressing plate (11), and the first branch (23) having a second threaded hole (26), the second branch (24) being located below the second workpiece (W2) and abutting against the second workpiece (W2); and a first screw rod (21) that is screwed through the second threaded hole (26) and abuts against the first workpiece (W1).
6. The jig assembly according to claim 5, characterized in that, The pressing plate (11) includes a third hole (17) located at the periphery of the pressing plate (11). In a state where the outer-ring fixture (20) clamps the plurality of workpieces, the third hole (17) is aligned with the second threaded hole (26), and the first screw rod (21) sequentially passes through the second threaded hole (26) and the third hole (17) to abut against the first workpiece (W1).
7. The jig assembly according to claim 6, wherein The first workpiece (W1) is in the shape of a column with a gradually increasing diameter from top to bottom. In a state where the inner-ring fixture (30) clamps the plurality of workpieces, the inner-ring fixture (30) includes: a pressing ring (31) sleeved on the first workpiece (W1) and located below the pressing plate (11), and the pressing plate (11) further includes a fourth threaded hole (18) that is closer to the center of the pressing plate (11) than the third hole (17); and a second screw rod (32) that passes through the fourth threaded hole (18) and abuts against the pressing ring (31).
8. The jig assembly according to claim 7, characterized in that, The number of the outer-ring fixtures (20) is the same as that of the second screw rods (32), and both are multiple.
9. The jig assembly according to claim 8, wherein, The first workpiece (W1) is the shroud (3) of the impeller (2) of a centrifugal compressor, and the second workpiece (W2) is the hub (4) of the impeller (2).
10. The fixture assembly according to claim 9, wherein the positions of the outer ring fixture (20) and the second screw (32) in the circumferential direction correspond to each other; and / or the positions of the outer ring fixture (20) and the second screw (32) in the circumferential direction correspond to the positions of the blades (5) of the impeller (2) in the circumferential direction.