CN115007959B - Method for improving vacuum brazing forming precision of centrifugal compressor impeller - Google Patents
Method for improving vacuum brazing forming precision of centrifugal compressor impeller Download PDFInfo
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- CN115007959B CN115007959B CN202210725813.1A CN202210725813A CN115007959B CN 115007959 B CN115007959 B CN 115007959B CN 202210725813 A CN202210725813 A CN 202210725813A CN 115007959 B CN115007959 B CN 115007959B
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- wheel disc
- wheel
- wheel cover
- brazing
- cover
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a method for improving the vacuum brazing processing forming precision of an impeller of a centrifugal compressor, which solves the technical problems of poor brazing quality, low primary product qualification rate, material waste and lower production efficiency in the prior art by adopting a mode of changing the placement mode of a wheel disc or a wheel cover of a brazing impeller, adding a brazing counterweight and controlling the number of clips for brazing, and comprises the following steps: s1, measuring the diameter of a wheel disc or a wheel cover and the thickness of the wheel disc, and determining the number of blades; s2, buckling the wheel cover with the wheel disc and checking a gap; s3, rubbing the contact surface of the blade and the wheel cover, and shearing brazing filler metal; s4, fixing the sheared brazing filler metal on the blade; s5, selecting a placement mode of the wheel disc or the wheel cover in the brazing process according to the diameter of the wheel disc or the wheel cover; s6, screwing the clamp on the outer circumference of the impeller, and performing vacuum brazing operation; the brazing rate of the centrifugal compressor impeller by the invention is not lower than 95%, and the outlet width is effectively controlled.
Description
Technical Field
The invention relates to a welding method of a centrifugal compressor impeller, in particular to a method for improving the vacuum brazing processing forming precision of the centrifugal compressor impeller.
Background
The impeller is a key component of the centrifugal compressor, and has two types of closed type and semi-open type. The closed impeller consists of blades, a shroud and a wheel disc. The centrifugal compressor has high rotating speed, high power and usually works in corrosive medium environment, so that the forming quality of the impeller plays an important role in the normal operation of the centrifugal compressor under various working conditions.
At present, for the impeller with smaller impeller diameter and air outlet width, the traditional manual arc welding forming cannot be performed due to space limitation, and the cost of integral milling is high, so that in order to reduce the cost, the vacuum brazing forming is generally adopted. However, the brazing rate, the width of the impeller outlet and the like are difficult to control in the vacuum brazing process, and the problem of large deformation exists, so that the primary brazing yield is low, and secondary brazing after desoldering is needed, which causes material waste and reduces production efficiency. In addition, for the large-diameter brazing impeller with the diameter more than 400mm, the traditional brazing method adopts a mode of placing a wheel disc under an upper wheel cover and a lower wheel cover for brazing, and the wheel disc is generally heavy, so that the wheel cover is often deformed greatly, the gap between the wheel cover and a blade is increased, the phenomenon that the brazing rate is less than 95% often occurs, and the design requirement cannot be met.
Disclosure of Invention
The invention provides a method for improving the vacuum brazing processing forming precision of a centrifugal compressor impeller, which solves the technical problems of poor brazing quality, low one-time product qualification rate, material waste and lower production efficiency in the brazing process in the prior art by adopting a mode of changing the placement mode of a wheel disc and a wheel cover of the brazing impeller, adding a brazing counterweight and controlling the number of clamps of the brazing impeller.
In order to achieve the above purpose, the technical solution provided by the present invention is:
the method for improving the vacuum brazing forming precision of the centrifugal compressor impeller is characterized by comprising a wheel cover, blades and a wheel disc, wherein the blades are milled on the wheel disc, and the method is characterized by comprising the following steps of:
s1, measuring the diameter of the wheel disc or the wheel cover and the thickness of the wheel disc, and checking the number of blades;
s2, buckling the wheel cover and the wheel disc, aligning the wheel cover with the outer circle of the wheel disc, checking the clearance between the blades and the wheel cover, checking whether the maximum clearance size is less than or equal to 0.05mm, if so, separating the wheel cover from the wheel disc, if not, separating the wheel cover from the wheel disc, and reprocessing, and returning to the step S1;
s3, rubbing a pattern along the contact surface of one blade and the wheel cover by using a rubbing pattern plate, extending the rubbing pattern thickness edge line of the blade to be 1-3 mm at equal distance, shearing along the equal distance line, reserving the rubbing pattern part of the blade as a brazing filler metal pattern plate, and scribing by using the brazing filler metal pattern plate, wherein the brazing filler metal is sheared, and the number of the brazing filler metal is the same as that of the blades;
s4, fixing the sheared brazing filler metal on the blade, placing the wheel cover on the wheel disc, aligning the wheel disc with the outer circle of the wheel cover, checking the gap between the wheel disc and the wheel cover, checking whether the maximum gap size is less than or equal to 0.05mm, if so, performing the next operation, if not, reprocessing the wheel cover and the wheel disc, and returning to the step S1;
s5, selecting a placement mode of the wheel disc and the wheel cover in the brazing process to place the wheel disc and the wheel cover according to the following three conditions:
(a) The diameter of the wheel disc or wheel cover is more than or equal to 400mm, the wheel cover is arranged above, the wheel disc is arranged below, and meanwhile, the counterweight ring is additionally arranged above the wheel disc;
(b) The diameter of the wheel disc or wheel cover is smaller than 400mm, the effective thickness of the wheel disc is smaller than 60mm, a traditional brazing centrifugal compressor impeller placing mode that the wheel cover is arranged at the lower part of the wheel disc is adopted, and meanwhile, a counterweight ring counterweight is added at the upper part of the wheel disc;
(c) The diameter of the wheel disc or the wheel cover is smaller than 400mm, the effective thickness of the wheel disc is more than or equal to 60mm, and the wheel disc is placed in a manner of placing the impeller of the traditional brazing centrifugal compressor with the wheel cover at the upper part and the wheel cover at the lower part;
s6, vacuum brazing forming
When the wheel cover and the wheel disc are placed in the steps S5 (a) and S5 (b), selecting at least half of blades, tightening a clamp consisting of a clamp body, a bolt and a nut on the outer circumferences of the wheel cover and the wheel disc, clamping and positioning the wheel cover and the wheel disc, and then performing vacuum brazing operation and performance heat treatment operation after brazing;
when the wheel cover and the wheel disc are placed in the step S5 (c), clips which are at least the same as the blades in number and are composed of clamping bodies, bolts and nuts are screwed on the outer circumferences of the wheel disc and the wheel cover, the wheel cover and the wheel disc are clamped and positioned, and then vacuum brazing operation and performance heat treatment operation after brazing are performed.
Further, in step S6, the clamping body includes a connecting riser, two clamping parts respectively disposed at two ends of the riser, wherein a first groove matched with the nut and a second groove coaxially disposed with the first groove are disposed on one of the clamping parts, and the second groove is matched with the bolt and penetrates through the upper surface and the lower surface of the clamping part;
the bayonet length H of the clamp, the air outlet width B of the wheel disc and the wheel cover and the air outlet thickness C of the wheel cover 1 Air outlet thickness C of wheel disc 2 The relation among the three is as follows: h=b+c 1 +C 2 In the formula, +A, A is a constant and has a value ranging from 2.9 to 3.1mm.
Further, in step S6, the value of a is 3mm.
Further, in step S6, the clips are uniformly distributed around the wheel cover and the outer circumference of the wheel disc at intervals.
Further, in step S5 (a), the ratio of the outer diameter of the weight ring to the outer diameter of the wheel cover is 1:1.5, the inner diameter is the same as the inner diameter of the wheel cover, and the weight of the counterweight ring is half of the total weight of the blade;
in step S5 (b), the ratio of the outer diameter of the weight ring to the outer diameter of the wheel cover is 1:1.5, the inner diameter is the same as the inner diameter of the wheel disc, and the weight of the counterweight ring is half of the total weight of the blade.
In step S5, the material of the counterweight ring is carbon steel.
Further, in step S6, the tightening nut is symmetrically and sectionally tightened by using an electronic torque wrench.
Further, in the step S1, the diameter of the wheel disc or the wheel cover is more than or equal to 400mm, and the number of the blades is 12;
in step S2, the maximum gap size is 0.01mm;
in the step S3, the topological edge line of the blade extends to 2mm at equal intervals;
in step S4, the maximum gap size is 0.03mm;
in step S6, the number of the clips is 6, and the value of A is 3mm.
Compared with the prior art, the invention has the following beneficial technical effects:
1. according to the method, the diameter and the thickness of the wheel disc or the wheel cover are measured firstly, and according to the conditions that the diameter of the wheel disc or the wheel cover is larger than or equal to 400mm, the diameter of the wheel disc or the wheel cover is smaller than 400mm, the effective thickness of the wheel disc is smaller than 60mm, the diameter of the wheel disc or the wheel cover is smaller than 400mm, the effective thickness of the wheel disc is larger than or equal to 60mm, a corresponding placement mode is selected, and the mode can be adopted for different wheel disc or wheel cover sizes, and compared with a traditional brazing mode, the brazing effect is good, the brazing qualification rate is high, and the brazing efficiency is improved;
2. the invention adopts the placing mode of the wheel cover above and the wheel disc below to braze the centrifugal compressor impeller, thereby reducing the deformation of the wheel cover, ensuring the brazing clearance and improving the welding rate of the brazing impeller with the diameter of the wheel disc or the wheel cover more than or equal to 400mm to be not lower than 95 percent;
3. the invention ensures the brazing rate of the brazing impeller by adopting a mode of adding the counterweight ring counterweight, reduces the rejection rate of the brazing impeller, simultaneously ensures the accuracy of the width dimensions of the wheel disc and the wheel cover outlet, reduces deformation and increases the qualification rate;
4. according to the invention, the number of brazing clips is reduced to 1/2 of the number of blades by adopting a mode of adding the counterweight ring counterweight, so that the process flow is simplified, and meanwhile, the tooling cost investment of the clips is reduced;
5. the invention adopts the special design that the clips are distributed at intervals on the outer circumferences of the wheel disc and the wheel cover and are screwed up by the electronic torque wrench, so that the acting force of each clip on the wheel disc and the wheel cover is consistent, then the vacuum brazing operation and the performance heat treatment operation after the brazing are carried out, and the brazing quality is ensured.
Drawings
FIG. 1 is a schematic view of a centrifugal compressor wheel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a centrifugal compressor wheel according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of the disk and blade configuration of a centrifugal compressor wheel in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view showing a usage state of a clip according to an embodiment of the present invention;
FIG. 5 illustrates a first placement of a brazed centrifugal compressor wheel disc and shroud in accordance with an embodiment of the present invention;
FIG. 6 illustrates a second placement of a brazed centrifugal compressor wheel disc and shroud in an embodiment of the present invention;
FIG. 7 shows a third placement of a brazed centrifugal compressor impeller wheel disc, shroud, in an embodiment of the invention, where D is the effective thickness of the wheel disc, when the diameter of the wheel disc or shroud is < 400mm and the effective thickness of the wheel disc is < 60 mm;
FIG. 8 is a schematic view of a clip according to an embodiment of the present invention;
fig. 9 is a front view of a clip body structure of a clip according to an embodiment of the present invention;
FIG. 10 is a left side view of FIG. 9;
fig. 11 is a top view of fig. 9.
Reference numerals:
1-wheel cover, 2-blade, 3-wheel disc, 4-card body, 401-first recess, 402-second recess, 5-bolt, 6-nut, 7-counter weight ring.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and specific examples:
example 1
A method for improving the vacuum brazing forming precision of an impeller of a centrifugal compressor comprises the following steps:
s1, measuring the diameter of the wheel disc 3 or the wheel cover 1 and the thickness of the wheel disc 3, and checking the number of the blades 2; 1-3, the centrifugal compressor impeller adopted in the embodiment consists of a wheel cover 1, blades 2 and a wheel disc 3, wherein the blades 2 are milled on the wheel disc 3, the materials are FV520B stainless steel, the diameter of the wheel disc 3 or the wheel cover 1 is more than or equal to 400mm, and the number of the blades 2 is 12;
s2, buckling the wheel cover 1 and the wheel disc 3, aligning the outer circles of the wheel cover 1 and the wheel disc 3, checking the gap between the blade 2 and the wheel cover 1, enabling the maximum gap size between the blade 2 and the wheel cover 1 to be 0.01mm, and separating the wheel cover 1 and the wheel disc 3;
s3, rubbing a sample along the contact surface of one blade 2 and the wheel cover 1 by using a rubbing sample plate, cutting the rubbing sample edge line of the blade 2 at equal intervals by 2mm along the equidistant line, reserving the rubbing sample part of the blade 2 as a brazing filler metal sample plate, and scribing by using the brazing filler metal sample plate, wherein the brazing filler metal is sheared, and the number of the brazing filler metal is the same as that of the blade 2;
s4, fixing the sheared brazing filler metal on the blade 2 by using an adhesive, aligning outlet ends, and uniformly extending the brazing filler metals on the other sides; placing the wheel cover 1 on the wheel disc 3, keeping the outer circles of the wheel disc 3 and the wheel cover 1 aligned, simultaneously ensuring that the brazing filler metal is not displaced, and then checking the maximum gap size of the wheel disc 3 and the wheel cover 1, wherein the maximum gap size is 0.03mm;
s5, placing the wheel disc 3 and the wheel cover 1 in a manner that the wheel cover 1 is arranged above and the wheel disc 3 is arranged below, and adding a counterweight ring 7 made of carbon steel above the wheel disc 3 for counterweight; the ratio of the outer diameter of the weight ring 7 to the outer diameter of the wheel cover 1 is 1:1.5, the inner diameter of the counterweight ring 7 is the same as the inner diameter of the wheel cover 1, the counterweight ring 7 is made of carbon steel, and the weight of the counterweight ring 7 is half of the total weight of the blade 2;
s6, selecting 6 brazing clips, wherein each clip consists of a clip body 4, a bolt 5 and a nut 6, and the size H of each clip is equal to the air outlet width B of the wheel disc 3 and the wheel cover 1 and the air outlet thickness C of the wheel cover 1 1 Air outlet thickness C of wheel disc 3 2 The relation among the three is as follows: h=b+c 1 +C 2 +3mm, as shown in FIG. 4; the clamps are distributed at intervals on the outer circumferences of the wheel disc 3 and the wheel cover 1 and are screwed by nuts 6, in order to ensure that the screwing force of each clamp is uniform, an electronic torque wrench is used for screwing in the process, symmetrical and staged screwing is ensured in the screwing process, and then the screwing is carried outVacuum brazing operation and performance heat treatment operation after brazing.
Example two
A method for improving the vacuum brazing forming precision of an impeller of a centrifugal compressor comprises the following steps:
s1, measuring the diameter of the wheel disc 3 or the wheel cover 1 and the thickness of the wheel disc 3, and checking the number of the blades 2; the centrifugal compressor impeller adopted in the embodiment consists of a wheel cover 1, blades 2 and a wheel disc 3, wherein the blades 2 are milled on the wheel disc 3, the materials are FV520B stainless steel, the diameter of the wheel disc 3 or the wheel cover 1 is smaller than 400mm, the effective thickness of the wheel disc 3 is smaller than 60mm, and the number of the blades 2 is 12;
s2, buckling the wheel cover 1 and the wheel disc 3, aligning the outer circles of the wheel cover 1 and the wheel disc 3, checking the gap between the blade 2 and the wheel cover 1, enabling the maximum gap size between the blade 2 and the wheel cover 1 to be 0.02mm, and separating the wheel cover 1 and the wheel disc 3;
s3, rubbing a sample along the contact surface of one blade 2 and the wheel cover 1 by using a rubbing sample plate, cutting the rubbing sample edge line of the blade 2 at equal intervals by 2mm along the equidistant line, reserving the rubbing sample part of the blade 2 as a brazing filler metal sample plate, and scribing by using the brazing filler metal sample plate, wherein the brazing filler metal is sheared, and the number of the brazing filler metal is the same as that of the blade 2;
s4, fixing the sheared brazing filler metal on the blade 2 by using an adhesive, aligning outlet ends, and uniformly extending the brazing filler metals on the other sides; placing the wheel cover 1 on the wheel disc 3, keeping the outer circles of the wheel disc 3 and the wheel cover 1 aligned, simultaneously ensuring that the brazing filler metal is not displaced, and then checking the maximum gap size between the maximum blades 2 of the wheel disc 3 and the wheel cover 1, wherein the maximum gap size is 0.01mm;
s5, placing the wheel disc 3 and the wheel cover 1 in a traditional brazing centrifugal compressor impeller placing mode that the wheel disc 3 is arranged above and the wheel cover 1 is arranged below, and simultaneously adding a counterweight ring 7 made of carbon steel above the wheel disc 3 for counterweight; the ratio of the outer diameter of the counterweight ring 7 to the outer diameter of the wheel cover 1 is 1:1.5, the inner diameter is the same as the inner diameter of the wheel disc 3, and the weight of the counterweight ring 7 is half of the total weight of the blade 2;
s6, selecting 6 brazing clips, wherein each clip consists of a clip body 4, a bolt 5 and a nut 6, and the size H of each clip is equal to the air outlet width B of the wheel disc 3 and the wheel cover 1 and the air outlet thickness C of the wheel cover 1 1 Air outlet thickness C of wheel disc 3 2 The relation among the three is as follows: h=b+c 1 +C 2 +3mm; the clamps are distributed at intervals on the outer circumferences of the wheel disc 3 and the wheel cover 1 and are screwed by nuts 6, in order to ensure that the screwing force of each clamp is uniform, an electronic torque wrench is used for screwing in the process, symmetrical and staged screwing in the screwing process is ensured, and then vacuum brazing operation and performance heat treatment operation after brazing are carried out.
Example III
A method for improving the vacuum brazing forming precision of an impeller of a centrifugal compressor comprises the following steps:
s1, measuring the diameter of the wheel disc 3 or the wheel cover 1 and the thickness of the wheel disc 3, and checking the number of the blades 2; the centrifugal compressor impeller adopted in the embodiment consists of a wheel cover 1, blades 2 and a wheel disc 3, wherein the blades 2 are milled on the wheel disc 3, the materials are FV520B stainless steel, the diameter of the wheel disc 3 or the wheel cover 1 is smaller than 400mm, the effective thickness of the wheel disc 3 is larger than or equal to 60mm, and the number of the blades 2 is 12;
s2, buckling the wheel cover 1 and the wheel disc 3, aligning the outer circles of the wheel cover 1 and the wheel disc 3, checking the maximum gap size between the blades 2 and the wheel cover 1, wherein the maximum gap size is 0.04mm, and separating the wheel cover 1 and the wheel disc 3;
s3, rubbing a sample along the contact surface of one blade 2 and the wheel cover 1 by using a rubbing sample plate, cutting the rubbing sample edge line of the blade 2 at equal intervals by 2mm along the equidistant line, reserving the rubbing sample part of the blade 2 as a brazing filler metal sample plate, and scribing by using the brazing filler metal sample plate, wherein the brazing filler metal is sheared, and the number of the brazing filler metal is the same as that of the blade 2;
s4, fixing the sheared brazing filler metal on the blade 2 by using an adhesive, aligning outlet ends, and uniformly extending the brazing filler metals on the other sides; placing the wheel cover 1 on the wheel disc 3, keeping the outer circles of the wheel disc 3 and the wheel cover 1 aligned, simultaneously ensuring that the brazing filler metal is not displaced, and then checking the maximum gap size of the wheel disc 3 and the wheel cover 1, wherein the maximum gap size is 0.03mm;
s5, placing the wheel disc 3 and the wheel cover 1 in a manner of placing the wheel disc 3 above and the wheel cover 1 below by adopting a traditional brazing centrifugal compressor impeller;
s6, selecting 12 clips for brazing, wherein each clip comprises a clip body4. The bolt 5 and the nut 6, the size H of the clamp, the air outlet width B of the wheel disc 3 and the wheel cover 1, and the air outlet thickness C of the wheel cover 1 1 Air outlet thickness C of wheel disc 3 2 The relation among the three is as follows: h=b+c 1 +C 2 +3mm; the clamps are distributed at intervals on the outer circumferences of the wheel disc 3 and the wheel cover 1 and are screwed by nuts 6, in order to ensure that the screwing force of each clamp is uniform, an electronic torque wrench is used for screwing in the process, symmetrical and staged screwing in the screwing process is ensured, and then vacuum brazing operation and performance heat treatment operation after brazing are carried out.
As shown in fig. 8-11, in the embodiment of the present invention, the clip body 4 using the clip includes a connecting riser, two clamping parts respectively disposed at two ends of the riser, wherein a first groove 401 matched with the nut 6 is disposed on one clamping part, and a second groove 402 coaxially disposed with the first groove 401, and the second groove 402 is matched with the bolt 5 and penetrates through the upper surface and the lower surface of the clamping part; when the clamp is used, the nut 6 is firstly placed in the first groove 401, then the bolt 5 is placed in the second groove 402 from the upper surface of the clamping part, and the bolt 5 is screwed to sequentially pass through the lower surfaces of the nut 6 and the clamping part, so that the wheel disc 3 and the wheel cover 1 are clamped;
after the brazing is finished, C scanning and mechanical property testing are carried out on the brazed centrifugal compressor impeller, and the test result shows that the brazing rate is not lower than 95%, and the outlet width is effectively controlled.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (8)
1. The method for improving the vacuum brazing forming precision of the centrifugal compressor impeller is characterized by comprising a wheel cover (1), blades (2) and a wheel disc (3), wherein the blades (2) are milled on the wheel disc (3), and the method is characterized by comprising the following steps:
s1, measuring the diameter of the wheel disc (3) or the wheel cover (1) and the thickness of the wheel disc (3), and checking the number of blades (2);
s2, buckling the wheel cover (1) and the wheel disc (3), aligning the wheel cover (1) with the outer circle of the wheel disc (3), checking the gap between the blade (2) and the wheel cover (1), checking whether the maximum gap size is less than or equal to 0.05mm, if so, separating the wheel cover (1) from the wheel disc (3), if not, separating the wheel cover (1) from the wheel disc (3), and re-processing, and returning to the step S1;
s3, rubbing a pattern by using a rubbing pattern plate along the contact surface of one blade (2) and the wheel cover (1), extending the rubbing pattern thickness edge line of the blade (2) at equal distance by 1-3 mm, shearing along an equal distance line, reserving the rubbing pattern part of the blade (2) as a brazing filler metal pattern plate, scribing by using the brazing filler metal pattern plate, and shearing brazing filler metal, wherein the brazing filler metal quantity is the same as that of the blade (2);
s4, fixing the sheared brazing filler metal on the blade (2), placing the wheel cover (1) on the wheel disc (3), aligning the wheel disc (3) with the outer circle of the wheel cover (1), checking the gap between the wheel disc (3) and the wheel cover (1), checking whether the maximum gap size is less than or equal to 0.05mm, if so, performing the next operation, if not, reprocessing the wheel cover (1) and the wheel disc (3), and returning to the step S1;
s5, selecting a placement mode of the wheel disc (3) and the wheel cover (1) in the brazing process to place the wheel disc (3) and the wheel cover (1) according to the following three conditions:
(a) The diameter of the wheel disc (3) or the wheel cover (1) is more than or equal to 400mm, a mode that the wheel cover (1) is arranged above and the wheel disc (3) is arranged below is adopted, and meanwhile, the counterweight ring (7) is additionally arranged above the wheel disc (3) for counterweight;
(b) The diameter of the wheel disc (3) or the wheel cover (1) is smaller than 400mm, the effective thickness of the wheel disc (3) is smaller than 60mm, a traditional brazing centrifugal compressor impeller placement mode that the wheel cover (1) is arranged below is adopted above the wheel disc (3), and meanwhile, a counterweight ring (7) is additionally arranged above the wheel disc (3);
(c) The diameter of the wheel disc (3) or the wheel cover (1) is smaller than 400mm, the effective thickness of the wheel disc (3) is more than or equal to 60mm, and a traditional brazing centrifugal compressor impeller placing mode that the wheel disc (3) is arranged above and the wheel cover (1) is arranged below is adopted;
s6, vacuum brazing forming
When the wheel cover (1) and the wheel disc (3) are placed in the steps S5 (a) and S5 (b), selecting at least half of blades (2), screwing the clamps consisting of the clamp body (4), the bolts (5) and the nuts (6) on the outer circumferences of the wheel disc (3) and the wheel cover (1), clamping and positioning the wheel cover (1) and the wheel disc (3), and then performing vacuum brazing operation and performance heat treatment operation after brazing;
when the wheel cover (1) and the wheel disc (3) are placed in the step S5 (c), the clips which are at least the same as the blades (2) in number and composed of the clamping bodies (4), the bolts (5) and the nuts (6) are screwed on the outer circumferences of the wheel disc (3) and the wheel cover (1), the wheel cover (1) and the wheel disc (3) are clamped and positioned, and then vacuum brazing operation and performance heat treatment operation after brazing are performed.
2. The method for improving the vacuum brazing forming accuracy of an impeller of a centrifugal compressor according to claim 1, wherein:
in step S6, the clamping body (4) includes a connecting riser, two clamping parts respectively disposed at two ends of the riser, wherein a first groove (401) matched with the nut (6) and a second groove (402) coaxially disposed with the first groove (401) are disposed on one clamping part, and the second groove (402) is matched with the bolt (5) and penetrates through the upper surface and the lower surface of the clamping part;
the length H of the bayonet of the clamp, the width B of the air outlet of the wheel disc (3) and the wheel cover (1), and the thickness C of the air outlet of the wheel cover (1) 1 Air outlet thickness C of wheel disc (3) 2 The relation among the three is as follows: h=b+c 1 +C 2 In the formula, +A, A is a constant and has a value ranging from 2.9 to 3.1mm.
3. The method for improving the vacuum brazing forming accuracy of the impeller of the centrifugal compressor according to claim 2, wherein:
in step S6, the value of A is 3mm.
4. A method of improving the accuracy of vacuum brazing of a centrifugal compressor wheel according to claim 3, wherein:
in step S6, the clips are uniformly distributed around the outer circles of the wheel cover (1) and the wheel disc (3) at intervals.
5. The method for improving the vacuum brazing forming accuracy of an impeller of a centrifugal compressor according to any one of claims 1 to 4, wherein:
in step S5 (a), the ratio of the outer diameter of the weight ring (7) to the outer diameter of the wheel cover (1) is 1:1.5, the inner diameter is the same as the inner diameter of the wheel cover (1), and the weight of the counterweight ring (7) is half of the total weight of the blade (2);
in step S5 (b), the ratio of the outer diameter of the weight ring (7) to the outer diameter of the wheel cover (1) is 1:1.5, the inner diameter is the same as the inner diameter of the wheel disc (3), and the weight of the counterweight ring (7) is half of the total weight of the blade (2).
6. The method for improving the vacuum brazing forming accuracy of the impeller of the centrifugal compressor according to claim 5, wherein:
in step S5, the material of the weight ring (7) is carbon steel.
7. The method for improving the vacuum brazing forming accuracy of an impeller of a centrifugal compressor according to claim 6, wherein:
in the step S6, the tightening nut (6) is symmetrically and sectionally tightened by adopting an electronic torque wrench.
8. The method for improving the vacuum brazing forming accuracy of an impeller of a centrifugal compressor according to claim 7, wherein:
in the step S1, the diameter of the wheel disc (3) or the wheel cover (1) is more than or equal to 400mm, and the number of the blades (2) is 12;
in the step S2, the maximum gap size is 0.03mm;
in the step S3, the topological edge of the blade (2) is extended outwards by 2mm at equal intervals;
in step S4, the maximum gap size is 0.03mm;
in step S6, the number of the clips is 6, and the value of A is 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210725813.1A CN115007959B (en) | 2022-06-23 | 2022-06-23 | Method for improving vacuum brazing forming precision of centrifugal compressor impeller |
Applications Claiming Priority (1)
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| CN104126075A (en) * | 2012-02-15 | 2014-10-29 | 三星泰科威株式会社 | Rotation body of rotary machine and method of manufacturing rotation body |
| CN111408805A (en) * | 2020-03-05 | 2020-07-14 | 西安陕鼓动力股份有限公司 | Manufacturing process method of impeller in same furnace for brazing and performance heat treatment |
| WO2021030440A1 (en) * | 2019-08-13 | 2021-02-18 | Emerson Climate Technologies, Inc. | Methods for manufacturing a shrouded impeller, shrouded impeller and compressor |
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| CN104126075A (en) * | 2012-02-15 | 2014-10-29 | 三星泰科威株式会社 | Rotation body of rotary machine and method of manufacturing rotation body |
| WO2021030440A1 (en) * | 2019-08-13 | 2021-02-18 | Emerson Climate Technologies, Inc. | Methods for manufacturing a shrouded impeller, shrouded impeller and compressor |
| CN111408805A (en) * | 2020-03-05 | 2020-07-14 | 西安陕鼓动力股份有限公司 | Manufacturing process method of impeller in same furnace for brazing and performance heat treatment |
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| 离心式压缩机的低合金钢钎焊工作叶轮;В.Н.Радзиевский, С.Н.Лоцманов, В.Н.Рымарь;压缩机技术(01);全文 * |
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