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Closed impeller and manufacturing method thereof

The technology of a closed impeller and a manufacturing method can be applied to manufacturing tools, non-variable-capacity pumps, liquid fuel engines, etc., and can solve the problems of high manufacturing costs, easy residual molten metal, and reduced operating efficiency of centrifugal compressors. The effect of high bonding strength

Pending Publication Date: 2021-07-23
DAIKIN IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, since the range that can be cut is limited by the structure of the machining device or the tool, it may not be possible to obtain the desired shape of the closed impeller.
[0004] Compared with machining, precision casting has less restrictions on the shape of the impeller, but has the problem of low dimensional accuracy.
Therefore, the hermetic impeller obtained by precision casting may lead to a decrease in the operating efficiency of the centrifugal compressor
In addition, for example, when it is desired to produce a small impeller having a diameter of 100 mm or less, mold materials such as gypsum tend to remain in the flow path of molten metal after casting.
Moreover, there is a problem that it is difficult to discharge the material of the mold from the impeller, and the manufacturing cost tends to be high.

Method used

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  • Closed impeller and manufacturing method thereof
  • Closed impeller and manufacturing method thereof
  • Closed impeller and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] use Figure 1 to Figure 4 Examples of the above-mentioned hermetic impeller and its manufacturing method will be described. Such as figure 1 and figure 2 As shown, the hermetic impeller 1 has: an impeller body 2 made of aluminum alloy, and includes a hub portion 21 and a blade portion 22 protruding from the hub portion 21 ; and a shroud 3 covering the blade portion 22 . Such as image 3 As shown, the blade portion 22 and the shroud 3 are joined by a brazed joint 4 interposed between the blade portion 22 and the shroud 3 . In addition, the shroud 3 is a brazing sheet 30 including a core material 31 made of an aluminum alloy and a brazing material layer 32 disposed on the core material 31 and existing opposite to the blade portion 22 . 33 of the most surface. In addition, below, the outermost surface 33 of the shroud 3 which opposes the blade part 22 is called "the inner surface 33 of the shroud 3."

[0079] Such as figure 1 As shown, the hermetic impeller 1 of th...

Embodiment 2

[0097] This example is an example in which the bonding strength of the brazed joint 4 formed between the shroud 3 and the blade portion 22 is evaluated using the test piece 100 simulating the shapes of the shroud 3 and the blade portion 22 . In addition, unless otherwise specified, among the symbols used in this example and subsequent embodiments, the same symbols as those used in the conventional examples represent the same components and the like as the conventional examples.

[0098] Such as Figure 5 As shown, the test piece 100 used in this example has a first member 101 simulating the blade portion 22 and a second member 102 simulating the shroud 3 . The first member 101 is a flat plate made of JIS A6061 alloy and having a thickness of 3 mm. In addition, the second member 102 is a brazing sheet 300 (test materials 1 to 21) having a thickness of 2 mm and having a laminated structure shown in Table 1.

[0099] In addition, the symbol "Bal." in Table 1 is a symbol indicat...

Embodiment 3

[0120] This example is an example of evaluating the brazability when the impeller body 2 made of JIS A6061 alloy and the shroud 3 made of the test materials shown in Table 1 are brazed. In this example, first, a block of JIS A6061 alloy was subjected to cutting processing to produce an impeller body 2 with an outer diameter of 40 mm. Then, using the test materials shown in Table 1, the shroud 3 corresponding to the impeller body 2 was fabricated. These impeller main bodies 2 and shroud 3 were brazed by the method described in Example 2 to obtain a hermetic impeller 1 .

[0121] The evaluation of solderability can be performed based on the shape of the fillet 42 formed in the solder joint 4 and the occurrence state of joint defects in the solder joint 4 . When evaluating the shape of the fillets 42 , first, the hermetic impeller 1 after brazing was cut. Then, the shape of the fillet 42 of the solder joint 4 visible from the cut portion was observed. The meanings of the symbo...

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Abstract

A closed impeller (1) is made of an aluminum alloy and has: an impeller body (2) provided with a hub part (21) and vane parts (22) protruding from the hub part (21); and a shroud (3) that covers the vane parts (22). The vane parts (22) and the shroud (3) are bonded together by brazing joints (4) interposed between the vane parts (22) and the shroud (3). The shroud (3) is a brazing sheet (30) provided with a core member (31) made of an aluminum alloy and a brazing material layer (32) placed above the core member (31) and present on an outermost surface (33) facing the vane parts (22).

Description

technical field [0001] The present invention relates to a closed impeller and a method of manufacturing the same. Background technique [0002] For example, as a compressor incorporated into an air conditioner or the like, a centrifugal compressor may be used that includes a casing having a suction port for sucking in fluid and a discharge port for discharging fluid, and an impeller held rotatably. inside the shell. The impeller of the centrifugal compressor can guide the fluid sucked in from the suction port to the discharge port while being compressed by rotating in the casing. As such an impeller, a canned impeller including a hub held by a housing, blades protruding from the hub, and a shroud covering the blades is known. In a closed impeller, the space enclosed by the hub, blades and shroud becomes the flow path of the fluid. [0003] Conventionally, closed impellers have been manufactured by any one of cutting, precision casting, and brazing. In the cutting process...

Claims

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Application Information

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IPC IPC(8): F04D29/28F04D29/44F04D29/62
CPCF04D29/284F04D29/023F05D2300/121F05D2230/237B23K35/0238B23K35/286B23K1/0008C22C21/02F04D29/28
Inventor 冈田忠司西村公佑上田薰伊藤泰永
Owner DAIKIN IND LTD
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