Composite motor shell

Abstract

A composite motor shell is formed by sleeving an inner cylinder body and an outer cylinder body, the outer wall of the inner cylinder body is in close contact with the inner wall of the outer cylinder body, the inner cylinder body is an aluminum alloy extrusion forming pipe, and the outer cylinder body is a stainless steel pipe. The utility model has the advantages that the advantages of two metals and two pipes are complementary, thereby not only saving the material cost and machining cost of stainless steel castings, but also saving the cost of spraying an anti-corrosion and waterproof layer on the surface of aluminum alloy, meeting certain waterproof and anti-corrosion requirements, and reducing the manufacturing cost of the motor.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technology, especially the shell structure of motor. BACKGROUND

[0002] The traditional motor shell is made of cast iron or cast aluminum alloy. Such motor shell has no corrosion resistance and is not suitable for use in water pump, aquaculture oxygenation machine, air conditioning system cooling tower, open-air sunning and raining place and other use occasions requiring certain waterproof and corrosion resistance. In order to meet the requirement of waterproof and corrosion resistance, people think of casting motor shell with stainless steel. The motor shell cast with stainless steel must have a large thickness, otherwise the casting will have a material deficiency bubble defect. In addition, due to the requirement of waterproof sealing, the motor shell must also have a certain thickness so as to install a waterproof sealing ring at the joint position between the two ends of the motor shell and the motor end cover. However, the thicker stainless steel shell leads to difficult reduction of material cost, and the casting process steps are numerous, so the process cost is naturally low, plus some position precision requirements of the motor shell structure are high, for example, the inner wall of the shell and the motor stator joint surface must be precisely machined for concentricity to prevent the displacement of the stator, and the clamping strip for preventing the displacement of the stator can only be installed after the completion of the precision machining of the casting, which all lead to difficult reduction of the manufacturing cost of the motor. SUMMARY

[0003] The utility model aims at providing a composite motor shell which can meet certain waterproof and corrosion resistance requirements and reduce the manufacturing cost of the motor.

[0004] The utility model is implemented in the following way: the composite motor shell is composed of an inner cylinder and an outer cylinder which are sleeved together, the outer wall of the inner cylinder is in close contact with the inner wall of the outer cylinder, the inner cylinder is an aluminum alloy extruded pipe, and the outer cylinder is a stainless steel pipe.

[0005] As the best implementation mode, the wall thickness of the outer cylinder is 2-3 mm, and the wall thickness of the inner cylinder is 4-6 mm.

[0006] As the best implementation mode, the inner wall of the inner cylinder is integrally formed with a first protruding part for embedding the motor stator.

[0007] As the best implementation mode, the inner wall of the outer cylinder is provided with a groove, and the outer wall of the inner cylinder is integrally formed with a second protruding part embedded in the groove.

[0008] As the best implementation mode, as viewed from the cross section of the inner cylinder, the first protruding part and the second protruding part are located on the same straight line passing through the center point of the inner cylinder.

[0009] As the best embodiment, the outer wall of the outer cylinder is welded with stainless steel heat dissipation fins, the cross section of the heat dissipation fins is "U" shape from the cross section of the outer cylinder, and the screws connecting the front and rear end covers of the motor are clamped in the middle of the "U" shape.

[0010] The utility model discloses the advantages are: 1. both save the cost of high stainless steel casting and save the cost of spraying the anticorrosive waterproof layer on the surface of aluminum alloy, meet certain waterproof anticorrosive requirement and reduce motor manufacturing cost, 2. under the condition of same size, the weight of the stainless steel pipe of outer cylinder is only about 25% of single stainless steel casting, and the cost is only about 20% of stainless steel casting, the cost of the aluminum alloy extrusion forming pipe of inner cylinder is about 25% of stainless steel casting, the cost of the whole composite motor shell is about 50% of stainless steel casting, and about 50% of cost is saved, 3. the inner cylinder made of aluminum alloy extrusion forming pipe is enough to reach the precision required by motor stator pressing into motor shell, and the expensive expense of stainless steel casting shell mechanical processing is saved, and the outer cylinder made of stainless steel pipe fully plays the anticorrosive performance of stainless steel, protects the inner cylinder aluminum alloy with good heat transfer performance, and the advantages of two kinds of metals are complementary. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the cross section schematic view of composite motor shell;

[0012] Figure 2 It is Figure 1 A-A section view of it. DETAILED DESCRIPTION

[0013] In order to understand the utility model, the utility model is described more comprehensively through examples below. The embodiment gives the implementation mode of the utility model. However, the utility model can be realized in many different forms, and is not limited to the implementation mode described in the embodiment.

[0014] It should be noted that "first", "second" in the utility model are only used for name distinction, and do not represent specific quantity and order.

[0015] Referring to Figure 1The utility model discloses a composite motor shell is by the inner cylinder 1 and the outer cylinder 2 of mutual suit, and the outer wall of inner cylinder 1 is in close contact with the inner wall of outer cylinder 2. Inner cylinder 1 is aluminium alloy extrusion forming pipe material, and outer cylinder 2 is stainless steel pipe material, preferably adopts the stainless steel seamless pipe material of seamless steel pipe manufacturing process. The wall thickness of outer cylinder 2, that is the wall thickness of stainless steel pipe material is preferably 2-3 millimeters. The wall thickness of inner cylinder 1, that is the wall thickness of aluminium alloy pipe material is preferably 4-6 millimeters. As the best implementation mode, the inner wall of inner cylinder 1 is integrally formed with first protruding part 3 for embedding motor stator, and the effect of preventing stator displacement is played. Further, the inner wall of outer cylinder 2 is processed with recess, and the outer wall of inner cylinder 1 is integrally formed with second protruding part 4 embedding the recess. Second protruding part 4 improves the firmness of the sleeve connection of inner cylinder 1 and outer cylinder 2. First protruding part 3 and second protruding part 4 are formed at one time when aluminium alloy extrusion forming pipe material is extruded, and the assembly precision requirement can be met without additional processing. As the best implementation mode, as shown in Figure 1 From the cross section of inner cylinder, first protruding part 3 and second protruding part 4 are located on the same straight line through the center point of inner cylinder, so as to facilitate the installation of fixture.

[0016] Figure 2 An embodiment of the composite motor shell and motor end cover connection is shown. As shown in Figure 2 A waterproof sealing ring 8 is installed at the joint position between the composite motor shell and motor front and rear end covers 6, 7. The motor end cover can also be fixed with screw seat for connecting gear reducer. As the best implementation mode, referring to Figure 1 、 Figure 2 The outer wall of outer cylinder 2 is welded with stainless steel heat dissipation fin 5, and from the cross section of outer cylinder, the cross section of heat dissipation fin 5 is "U" shape, and stainless steel screw 9 connecting motor front and rear end covers is clamped in the middle of "U" shape. This structure not only strengthens the heat dissipation of motor shell, but also the heat dissipation fin has the effect of preventing the relative rotation of motor end cover and motor shell, so that it is not necessary to specially set threaded hole on the end face of motor shell for fixing motor end cover, and the motor structure is simplified.

[0017] The above-mentioned embodiments only express several implementation modes of the utility model, and the description is more specific and detailed, but it can not be understood as the limitation of patent protection scope. It should be pointed out that for ordinary skilled person in the art, several deformation and improvement can be made without departing from the concept of the utility model, and these all belong to the protection scope of the patent.

Claims

1. A composite motor housing characterized by: The inner cylinder and the outer cylinder are sleeved together, the outer wall of the inner cylinder is in close contact with the inner wall of the outer cylinder, the inner cylinder is an aluminum alloy extruded pipe, the outer cylinder is a stainless steel pipe, and the inner wall of the inner cylinder is integrally formed with a first protruding part for embedding a motor stator.

2. The composite motor housing of claim 1, wherein: The wall thickness of the outer cylinder is 2-3 mm, and the wall thickness of the inner cylinder is 4-6 mm.

3. The composite motor housing of claim 1 wherein: The inner wall of the outer cylinder is provided with a groove, and the outer wall of the inner cylinder is integrally formed with a second protruding part embedded in the groove.

4. The composite motor housing of claim 3 wherein: From the cross section of the inner cylinder, the first protruding part and the second protruding part are located on the same straight line passing through the center point of the inner cylinder.

5. The composite motor housing of claim 1 wherein: The outer wall of the outer cylinder is welded with a stainless steel heat dissipation fin, and from the cross section of the outer cylinder, the cross section of the heat dissipation fin is "U" shaped, and the screws connecting the front and rear end covers of the motor are clamped in the middle of the "U".

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