Shaft, rotor and air compressor

Abstract

The utility model provides a shaft, a rotor and an air compressor, and belongs to the technical field of air compressors. The shaft provided by the utility model comprises a main body and a shaft head, the main body is coated with a magnetic leakage prevention layer; and the shaft heads are connected to the magnetic leakage prevention layers at the two ends of the main body. According to the shaft provided by the utility model, only the outer part of the middle main body part is coated with the magnetic leakage prevention layer, and the whole outer part of the shaft does not need to be coated with the magnetic leakage prevention layer, so that the use of the magnetic leakage prevention layer is reduced, and the whole cost of the shaft is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of air compressors, and more specifically, relates to a shaft, a rotor and an air compressor. Background Art

[0002] The rotor is the core component of a centrifugal compressor and consists of an impeller, a main shaft, a balance plate, a thrust plate, etc. The rotor main shaft in the prior art is made entirely of GH4169 material, resulting in a high cost for the rotor. Utility Model Content

[0003] The purpose of the utility model is to provide a shaft, a rotor and an air compressor, aiming to solve the problem that the rotor in the prior art is made of GH4169 material throughout, which is high in cost.

[0004] In a first aspect, the technical solution adopted by the present invention is to provide a shaft, comprising:

[0005] The main body is covered with a magnetic leakage-proof layer; and

[0006] The shaft head is connected to the anti-magnetic leakage layers at both ends of the main body.

[0007] In a possible implementation, the main body includes a magnetic steel part arranged at the center, and the anti-magnetic leakage layer is coated on the outside of the magnetic steel part.

[0008] In a possible implementation, the anti-magnetic leakage layer is a GH4169 layer.

[0009] In a possible implementation, the shaft head is a 17-4PH part.

[0010] In a possible implementation, the main body and the shaft head are coaxially arranged.

[0011] In a possible implementation, the diameter of the shaft head is smaller than the diameter of the magnetic steel part.

[0012] In a possible implementation manner, the shaft head is welded to the anti-magnetic leakage layer.

[0013] In a possible implementation, the anti-magnetic leakage layer has a thickness of at least 10 mm.

[0014] In a second aspect, the present invention provides a rotor comprising the shaft as described in the first aspect.

[0015] In a third aspect, the air compressor provided by the present invention includes the rotor as described in the second aspect.

[0016] The beneficial effect of the rotor provided by the present invention is that, compared with the prior art, the shaft provided by the present invention is only coated with an anti-magnetic leakage layer on the outside of the middle main body, and there is no need to coat the anti-magnetic leakage layer on the entire outside of the shaft, thereby reducing the use of the anti-magnetic leakage layer and reducing the overall cost of the shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of the shaft provided in an embodiment of the present utility model.

[0019] Description of reference numerals:

[0020] 1. Main body; 11. Magnetic steel part; 12. Anti-leakage magnetic layer; 13. Shaft head. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] The shaft, rotor and air compressor provided by the utility model are now described.

[0023] Reference Figure 1 The shaft provided in the first aspect of this embodiment includes a main body 1 and a shaft head 13 provided at the end of the main body 1. The exterior of the main body 1 is covered with a magnetic leakage prevention layer 12 on one side, and two shaft heads 13 are provided, and the two shaft heads 13 are respectively connected to the magnetic leakage prevention layer 12 at both ends of the main body 1.

[0024] Compared with the prior art, the shaft provided by the present invention is provided with a magnetic leakage prevention layer 12 on one side of the outer body 1, which only needs to ensure that the main body 1 can prevent magnetic leakage, and the shaft head 13 does not need to be covered with the magnetic leakage prevention layer 12. This reduces the use of magnetic leakage prevention materials and reduces the overall cost of the shaft.

[0025] Optionally, the main body 1 includes a magnetic steel part 11 arranged at a central position, and an anti-leakage magnetic layer 12 is coated on the outside of the magnetic steel part 11. The materials of the magnetic steel mainly include aluminum nickel cobalt alloy, ferrite magnet, neodymium iron boron magnet, cobalt magnet, etc. The magnetic steel is a permanent magnetic material used to make ultra-hard permanent magnetic alloys. Its main components include iron, aluminum, nickel, cobalt, etc., and sometimes also contain elements such as copper, niobium, and tantalum. After synthesis, these elements form a hard and strong metal alloy used to make permanent magnets.

[0026] Alnico magnets are the most primitive definition of magnets, also known as natural magnets. They can work normally at high temperatures of 500°C and have strong corrosion resistance.

[0027] Ferrite magnets are a widely used permanent magnetic material manufactured using powder metallurgy. They are resistant to demagnetization and corrosion, can operate at temperatures up to 250°C, and are hard but brittle. Neodymium iron boron magnets are a type of magnet material with very strong magnetic force, widely used in information technology, automobiles, nuclear magnetic resonance imaging, wind power generation, and other fields. They have high coercivity, high temperature resistance, and corrosion resistance. Cobalt magnets, also known as cobalt permanent magnets or rare earth cobalt permanent magnets, are a type of magnetic material made from metallic rare earth materials such as sulfur and cobalt. Although relatively less used in the market, they are also a type of magnet. These different types of magnets each have their own characteristics and are widely used in motors, sensors, instruments, electronics, automobiles, aviation technology, and other fields, providing important support for modern science and industry.

[0028] Optionally, the anti-magnetic leakage layer 12 is a GH4169 layer. GH4169 is a precipitation-strengthened nickel-based high-temperature alloy with excellent comprehensive performance within the temperature range of -253°C to 650°C. This alloy has the highest yield strength among deformable high-temperature alloys below 650°C, and exhibits excellent fatigue, radiation, oxidation, and corrosion resistance, as well as good machinability and weldability. These properties have led to its widespread application in aerospace, nuclear energy, the petroleum industry, and extrusion dies.

[0029] Hysteresis loop measurements of GH4169 at high temperatures reveal low remanence and coercivity, demonstrating excellent soft magnetic properties. Specifically, the remanence is 0.5 T and the coercivity is 5 A / m. These data indicate that GH4169 alloy is not susceptible to remanence at high temperatures and readily demagnetizes after magnetization, meeting the requirements for use in aircraft engine components. GH4169 nickel-based superalloy is clearly non-magnetic and exhibits excellent resistance to magnetic flux leakage.

[0030] The anti-magnetic layer 12 consists of a GH4169 cylinder and two GH4169 covers. The diameter of the magnetic component 11 is the same as the cylinder's inner diameter. The magnetic component 11 is installed inside the cylinder, and the two covers seal the ends of the cylinder. The two covers are welded to the cylinder.

[0031] Optionally, shaft head 13 may be made of 17-4PH. 17-4PH is a martensitic precipitation-hardening stainless steel, also known as composite stainless steel or 17-4PH alloy. Its chemical composition includes elements such as iron, chromium, nickel, copper, and molybdenum, along with small amounts of carbon and niobium. This stainless steel exhibits high strength and corrosion resistance and is commonly used in the manufacture of shafts, turbine components, and the like. The density of 17-4PH is lower than that of GH4169. Choosing 17-4PH for shaft head 13 can reduce the overall weight of the shaft.

[0032] Optionally, the main body 1 is coaxially arranged with the shaft head 13. The shaft head 13, the magnetic steel member 11 and the anti-magnetic leakage layer 12 are all coaxially arranged.

[0033] Optionally, the diameter of the shaft head 13 is smaller than the diameter of the magnetic steel part 11 .

[0034] Optionally, the shaft head 13 is welded to the anti-magnetic leakage layer 12. Specifically, the shaft head 13 is integrally welded to the anti-magnetic leakage layer 12 using friction welding. Friction welding is a welding method that uses heat generated by friction between the contact surfaces of the workpieces as a heat source to cause the workpieces to plastically deform under pressure.

[0035] Under the action of constant or increasing pressure and torque, the relative movement between the welding contact end faces generates frictional heat and plastic deformation heat on the friction surface and its vicinity, causing the temperature in the vicinity to rise to a temperature range close to, but generally below, the melting point. At this point, the material's deformation resistance decreases, its plasticity increases, and the oxide film on the interface breaks down. Under the action of pressure, the material undergoes plastic deformation and flow, and welding is achieved through molecular diffusion and recrystallization at the interface. The biggest difference between friction welding and traditional fusion welding is that the temperature reached by the energy raised during the entire welding process does not reach its melting point. In other words, the metal is connected in a forging-like solid-phase state in a thermoplastic state. Compared to traditional fusion welding, friction welding has the advantages of high-quality weld joints, achieving weld strength equal to that of the base material, high welding efficiency, stable quality, good consistency, and the ability to weld dissimilar materials.

[0036] Optionally, the thickness of the anti-magnetic leakage layer 12 is at least 10 mm. In order to ensure that welding can proceed smoothly, the thickness of the anti-magnetic leakage layer 12 is not less than 10 mm, so as to reserve operating space for welding.

[0037] In a second aspect, this embodiment provides a rotor comprising the shaft as described in the first aspect.

[0038] In a third aspect, this embodiment provides an air compressor, which includes the rotor as described in the second aspect.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A shaft, characterized in that include: A main body (1) is externally coated with a magnetic leakage prevention layer (12); and The shaft head (13) is connected to the anti-magnetic leakage layer (12) at both ends of the main body (1).

2. The shaft according to claim 1, wherein The main body (1) comprises a magnetic steel piece (11) arranged at the center, and the anti-magnetic leakage layer (12) is coated on the outside of the magnetic steel piece (11).

3. The shaft according to claim 1, wherein The anti-magnetic leakage layer (12) is a GH4169 layer.

4. The shaft according to claim 2, wherein The shaft head (13) is a 17-4PH part.

5. The shaft according to claim 2, wherein: The main body (1) and the shaft head (13) are coaxially arranged.

6. The shaft according to claim 4, wherein The diameter of the shaft head (13) is smaller than the diameter of the magnetic steel part (11).

7. The shaft according to claim 1, wherein The shaft head (13) is welded to the anti-magnetic leakage layer (12).

8. The shaft according to claim 7, wherein The thickness of the anti-magnetic leakage layer (12) is at least 10 mm.

9. A rotor, characterized in that Comprising a shaft as claimed in any one of claims 1 to 8.

10. Air compressor, characterized in that, Comprising the rotor as claimed in claim 9.

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