Engine impeller cover and processing technology thereof

Abstract

The present invention relates to an engine impeller cover and a processing technology thereof, comprising a first casting, a second casting, a channel, a first threaded ridge, a second threaded ridge, a spiral channel, a conical tube, a damping ring, an annular cavity and a reinforcing rib ring, wherein the reinforcing rib ring comprises a connecting ring and a reinforcing rib sheet integrally formed with the connecting ring and at a right angle thereto, the connecting ring being clamped in the abutting surface between the conical tube and the top inner wall and the first casting, and the present invention has the technical effect of making the engine impeller cover lighter with the same material and making it difficult for cracks to occur on the inner wall.

Description

Technical Field

[0001] The present invention relates to the technical field of engine impeller covers, and in particular to an engine impeller cover and a processing technology thereof. Background Art

[0002] The preparation of precision castings requires procedures such as injection molding, coating, bonding quartz sand, dewaxing, and baking. The process is to prepare raw materials in a certain proportion, form a mold shell after certain processing, and finally pour on the mold shell to form the final casting. The casting is then dewaxed to obtain a shell. In the existing investment casting process, paraffin wax is directly used to prepare the wax mold, and self-transfer coating is used as the transfer coating. Then a layer of adhesive is applied to the surface of the transfer coating, and then a shell is compounded on the outer layer of the adhesive. The bonding energy of the transfer coating and the bonding performance of the adhesive determine whether the transfer coating will peel off during the dewaxing process.

[0003] Existing impeller covers are affected by aerodynamic forces and thus vibrate. Furthermore, when conventional materials are used for the impeller cover and the operating temperature is maintained at 160 degrees Celsius all year round, if the inner surface strength of the impeller cover is not high enough, the shell may easily crack during use or transportation, affecting aviation safety. Summary of the Invention

[0004] The purpose of the present invention is to provide an engine impeller cover and a processing technology thereof.

[0005] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0006] 14. The repairing kit for automotive dents, according to claim 13, wherein the foot stand comprises a through-hole, and the two foot pieces comprise two bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut. The through-hole, the screw bolts comprise a through-hole, and the two foot pieces comprise a through-hole. The two foot pieces comprise a through-hole, a screw bolt, and a nut.

[0007] Preferably, the first casting is first cast into a circular tube shape, the inner wall of the first casting is formed by a spinning process, and the first thread ridges on the outer wall of the first casting are then carved.

[0008] Preferably, the second casting is first cast into a circular tube shape, the second thread ridges on the inner wall of the second casting are processed, and then the outer wall of the second casting is formed by a stamping process and polished.

[0009] Preferably, the second casting is first clamped and fixed, the first casting is placed directly above the second casting, and then the outer wall of the first casting is heated. After heating, the first casting is pressed into the interior of the second casting, and then the reinforcing rib ring is clamped to the top surfaces of the first casting and the second casting, and then the conical tube is welded to the top surfaces of the first casting and the second casting.

[0010] Preferably, the cross section of the spiral channel is circular.

[0011] In summary, the beneficial effects of the present invention are:

[0012] Such aircraft engine impeller covers generally have high structural strength under the same conditions and are not prone to cracking due to internal stress caused by excessive air resistance. They have a longer service life than single-layer engine impeller covers. At the same time, a conical tube is provided and a cavity and clamping reinforcement ribs are provided at the bottom of the conical tube, so that the casting cost of the conical tube is lower and the structural strength is higher. At the same time, a shock-absorbing ring is provided on the conical tube, which can make the impeller cover less likely to crack. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the overall structure of the engine impeller cover.

[0014] The markings in the figure are: 1, first casting; 2, second casting; 21, tapered tube; 22, shock-absorbing ring; 3, reinforcing rib ring. DETAILED DESCRIPTION

[0015] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the embodiments and the accompanying drawings. The contents mentioned in the embodiments are not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] See also Figure 1An engine impeller cover and a processing technology thereof include a first casting 1 and a second casting 2, wherein the first casting 1 is an inner tube, the inner wall of the first casting 1 is provided with a cylindrical vertical channel, the outer wall of the first casting 1 is integrally formed with a first threaded ridge, the second casting 2 is an outer tube, the inner wall of the second casting 2 is integrally formed with a second threaded ridge, the first threaded ridge and the second threaded ridge are adapted to each other, a spiral channel is formed between the first threaded ridge and the second threaded ridge, and a top between the first casting 1 and the second casting 2 is provided with a Conical tube 21, the top of the inner wall of the conical tube 21 is welded to the top surface of the first casting 1, the bottom surface of the inner wall of the conical tube 21 is welded to the top surface of the second casting 2, and a shock-absorbing ring 22 is provided on the top surface of the conical tube 21. The first casting 1, the second casting 2 and the conical tube 21 form an annular cavity with an interface of a right-angled triangle. The annular cavity accommodates a reinforcing rib ring 3, and the reinforcing rib ring 3 includes a connecting ring and a right-angled reinforcing rib sheet integrally formed on the connecting ring. The connecting ring is clamped in the abutment surface between the top inner wall of the conical tube 21 and the first casting 1.

[0018] Working principle: Under the same conditions, such an aircraft engine impeller cover generally has high structural strength and is not prone to cracking due to internal stress caused by excessive air resistance. It has a longer service life than a single-layer engine impeller cover. At the same time, a conical tube 21 is provided and a cavity and clamping reinforcement ribs are provided at the bottom of the conical tube 21, so that the casting cost of the conical tube 21 is lower and the structural strength is higher. At the same time, a shock-absorbing ring 22 is provided on the conical tube 21, which can make the impeller cover less likely to crack.

[0019] First, the first casting 1 is cast into a circular tube shape, and then the inner wall of the first casting 1 is formed by a spinning process, and then the first thread ridges on the outer wall of the first casting 1 are carved. Using this process to process the first casting 1 can make the inner wall of the first casting 1 more compact, higher in density and more resistant to high temperatures.

[0020] First, the second casting 2 is cast into a circular tube shape, and then the second thread ridge on the inner wall of the second casting 2 is processed. Then, the outer wall of the second casting 2 is formed by a stamping process and polished. Such a structure can make the surface of the second casting 2 smoother.

[0021] First, clamp and fix the second casting 2, place the first casting 1 directly above the second casting 2, then heat the outer wall of the first casting 1, press the first casting 1 into the second casting 2 after heating, then clamp the reinforcing rib ring 3 to the top surfaces of the first casting 1 and the second casting 2, and then weld the conical tube 21 to the top surfaces of the first casting 1 and the second casting 2.

[0022] The cross section of the spiral channel is circular.

[0023] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are all within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. An engine impeller cover, characterized in that: The invention comprises a first casting (1) and a second casting (2), wherein the first casting (1) is an inner tube, the inner wall of the first casting (1) is provided with a cylindrical vertical channel, the outer wall of the first casting (1) is integrally formed with a first threaded ridge, the second casting (2) is an outer tube, the inner wall of the second casting (2) is integrally formed with a second threaded ridge, the first threaded ridge and the second threaded ridge are matched, a spiral channel is formed between the first threaded ridge and the second threaded ridge, a conical tube (21) is provided at the top between the first casting (1) and the second casting (2), the conical tube (21) The top of the inner wall of the conical tube (21) is welded to the top surface of the first casting (1), the bottom surface of the inner wall of the conical tube (21) is welded to the top surface of the second casting (2), the top surface of the conical tube (21) is provided with a shock-absorbing ring (22), the first casting (1) and the second casting (2) and the conical tube (21) form an annular cavity with an interface in the form of a right-angled triangle, the annular cavity contains a reinforcing rib ring (3), the reinforcing rib ring (3) includes a connecting ring and a right-angled reinforcing rib sheet integrally formed on the connecting ring, the connecting ring is clamped in the abutment surface between the top inner wall of the conical tube (21) and the first casting (1).

2. The processing technology of an engine impeller cover according to claim 1, characterized in that: The first casting (1) is first cast into a circular tube shape, the inner wall of the first casting (1) is then formed by a spinning process, and the first thread ridges on the outer wall of the first casting (1) are then carved.

3. The processing technology of an engine impeller cover according to claim 2 is characterized in that: First, the second casting (2) is cast into a circular tube shape, then the second threaded ridges on the inner wall of the second casting (2) are processed, and then the outer wall of the second casting (2) is formed by a stamping process and polished.

4. The processing technology of an engine impeller cover according to claim 3 is characterized in that: First, the second casting (2) is clamped and fixed, and the first casting (1) is placed directly above the second casting (2). Then, the outer wall of the first casting (1) is heated. After heating, the first casting (1) is pressed into the interior of the second casting (2). Then, the reinforcing rib ring (3) is clamped on the top surfaces of the first casting (1) and the second casting (2), and then the conical tube (21) is welded to the top surfaces of the first casting (1) and the second casting (2).

5. The processing technology of an engine impeller cover according to claim 4 is characterized in that: The cross section of the spiral channel is circular.

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