Method of making welded impeller of a centrifugal compressor

 

(57) Abstract:

The method can be used in the manufacture of welded impellers, including large, to work under high mechanical loads. Make primary and covering disks and blanks blades. Produce welding blades with a covering disk around the perimeter of the inner surface of the covering disk in place of the pair of end surfaces of the blades with the surface coating of the disc. Perform weld covering disc with welded blades with the primary drive. The method provides high mechanical strength, reliability and durability of the impeller of the centrifugal compressor due to zero-defects and ravnopravnosti performed welded joints. 3 Il.

The invention relates to a compressor engineering and can be used in the manufacture of welded impellers, including large, to work under high mechanical loads. The invention can also be used in the manufacture of compressors, fans, blowers and similar turbomachines.

A known method of manufacturing the impeller of a centrifugal compressor by PfP preliminary to the main disk (A. C. The USSR 844829, Pat. USA 4201516, 4296308, 4720243, 5336050). The disadvantage of this method is the low quality of the welded connection end parts of the blades with the inner surface of the covering disk due to difficulties of access to the welding area in the area of the input side of the blades of the impeller.

A known method of manufacturing a welded impeller of a centrifugal compressor by running a billet core and covering disks, parts of the blades, milling and subsequent welding, while the middle part of the blades is performed by stamping from a sheet material (A. C. the USSR 1116223). The disadvantage of this method is the low reliability of manufactured structures due to the presence of the weld in the area of high level of stress.

There is a method of welding blades, in which the welded connection is performed through the slits in the covering disk (U.S. Pat. USA 4302657, 5735672). The disadvantage of this method is a significant increase of stresses in the weld area due to the presence of hubs in a heavy-duty drives the impeller.

A known method of manufacturing a permanent connection of the impeller (the primary drive verterbrae blades and covering disk) by the vacuum unit is expensive types of steels and alloys based on gold or platinum. In addition, for large wheels way more difficult to apply because of the need to use expensive bulky vacuum brazing.

Closest to the claimed invention (the prototype) is a method of manufacturing the impeller of the centrifugal compressor, which includes the production of primary and covering disks and blanks blades with auxiliary allowances and technological bases, the installation of blanks blades in the Assembly fixture, the processing of obtaining surfaces mate with the primary drive, the connection of the primary disk with vanes method of soldering or welding, the recess of the primary disk with the blades of the Assembly of the device and its installation on metal processing equipment, processing blades with receiving surfaces mate with a covering disk and the connection surface of the disk with vanes (RF Patent 2120567). The disadvantage of this method is the low quality of the welded connection end parts of the blades with the inner surface of the covering disk due to difficulties of access to the welding area in the area of the input side of the blades of the impeller.

The challenge aimed claimed from eskay strength and reliability of the wheel, as well as the simplification of manufacturing the impeller of the centrifugal compressor and saving costly material.

This object is achieved due to the fact that the operation of the connection of the blades with the disks begin with the weld connection of the blades with a covering disc in place of the pair of end surfaces of the vanes with the inner surface of the covering disk, welding lead around the perimeter of said surface of the covering disk. Then perform the weld surface of the disc with welded blades with the primary drive. This sequence of connection of the blades with the disks provides free access for carrying out the welding process and quality control of welded joints at various stages of its implementation, which allows to perform weld defect-free; this in turn provides a high mechanical strength of the impeller as a whole and its reliability. In addition, it simplifies the technology of manufacturing the impeller of the centrifugal compressor and save the expensive material.

Fig.1 is a longitudinal section of the impeller.

Fig.2 is a view of the impeller in a radial plane.

In Fig.3 shows a welded connection end surfaces of the blades 4 and 5 respectively with the inner surfaces of the main 6 and top 7 disks.

The method is as follows. Make primary and covering disks and blanks blades. The primary drive of the impeller 1 is made in a known manner, namely forging of traditional materials with category strength to the CP-80. Covering the disk of the impeller 2 is made by stamping and subsequent heat treatment of the sheet material high-strength steel KP-90. Manufacturer covering disk, stamped significantly increases the utilization of expensive material, optimum orientation of the fiber material and high structural strength as a finishing disk and the impeller in General, simplifies the manufacturing technology. Blades 3 performed by stamping from a sheet material of high strength steel KP-90, carry out machining of the ends of the blades 5 and 6 adjacent to the surfaces 6 and 7 of the main and covering disks 1 and 2. The execution of the punching blades provides a wide selection of the desired aerodynamic profile of the three-dimensional surface LEGO disk 2 and in a special jig welded perform the connection end surface of the stamped blades 5 and the inner surface of the covering disc 7, weld perform around the perimeter of the blades. Then conduct the heat treatment and cleaning of the weld, the processing in the final size of the covering disk with vanes, item balancing and quality control of welded connections. This technology weld connection provides access to produce high-quality welds, its technological refinement and reliable control at different stages of execution.

This weld blades 3 with a covering disc 2 has renoprotection along the entire length of the seam and defectless. Then do the final weld surface of the disk 2 with welded blades 3 with the main disk 1. Next, perform the operation, heat treatment, cleaning, balancing and control of residual stresses in welded joints, the finishing machining of discs 1 and 2 and the balancing of the impeller of the centrifugal compressor.

The method provides high mechanical strength, reliability and durability of the impeller of the centrifugal compressor due to zero-defects and ravnopravnosti performed welded joints. The way high-tech reduces the complexity of manufacturing Elam the cost of the manufacturing process.

Method of making welded impeller of a centrifugal compressor that includes manufacturing basic and covering disks and blanks blades with the subsequent welding of the blades with the core and covering disks, characterized in that initially produce welding blades with a covering disk around the perimeter of the inner surface of the covering disk in place of the pair of end surfaces of the blades with the said surface of the top disk, and then perform the weld surface of the disc with welded blades with the primary drive.

 

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SUBSTANCE: method comprises steps of dressing welded tubes edges and blunting them; assembling tubes and centering them; before welding heating up tube end portion along length equal approximately to 50 mm for tube made with negative allowance until equalizing diameter of said portion and diameter of tube made with positive allowance; realizing heating by means of heater arranged on end of tube made with negative allowance; performing electric-contact or electric-arc welding of butts of tubes.

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3 cl, 4 dwg, 1 ex

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