A compressor housing and a rotary compressor

Abstract

This invention discloses a compressor housing and a rotary compressor. The compressor housing is made of an iron-nickel austenitic alloy, the composition of which includes nickel, iron, chromium, manganese, and titanium. The microstructure of the iron-nickel austenitic alloy consists of equiaxed austenitic grains. This invention proposes a new housing material, namely, using an iron-nickel austenitic alloy to prepare the compressor housing. Compared with commonly used cold-rolled steel for housings, this iron-nickel austenitic alloy is non-magnetic, and therefore will not generate induced current with the stator core. This avoids increased iron loss and solves the problem of weak magnetic permeability in compressor housing materials, thereby improving the efficiency of the motor in the compressor.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a compressor housing and a rotary compressor. Background Technology

[0002] A rotary compressor (also known as a rotor compressor) is a new type of compressor in which the motor does not need to convert the rotational motion of the rotor into the reciprocating motion of the piston, but directly drives the rotary piston to rotate to complete the compression of refrigerant vapor.

[0003] Currently, rotary compressors use an interference fit to connect the casing and motor stator, followed by stator assembly via heat fitting or welding to fix the stator and casing. However, this assembly method can cause compressive stress on the stator due to the thermal contraction of the casing. When subjected to external compressive stress, the magnetic properties of the silicon steel material used in the stator deteriorate, leading to increased iron losses in the motor. Therefore, after heat fitting the stator to the casing, the motor efficiency decreases compared to a motor without heat fitting, specifically by 0.3% to 0.5%.

[0004] In addition, the compressor housing is mainly made of cold-rolled steel. Although this material is a weakly magnetic material, it still has magnetic permeability. Therefore, when the stator silicon steel sheet and the outer cold-rolled steel plate are in close axial contact over a large area, the alternating magnetic field in the stator core will induce current in the outer steel plate during motor operation, resulting in a large amount of eddy current loss, which will also affect the motor efficiency of the compressor.

[0005] Therefore, how to improve the motor efficiency of the compressor is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] This invention provides a compressor housing and a rotary compressor, aiming to solve the problem of weak magnetic permeability of the compressor housing material and improve the efficiency of the motor in the compressor.

[0007] This invention provides a compressor housing made of an iron-nickel austenitic alloy, the composition of which includes nickel, iron, chromium, manganese and titanium.

[0008] The microstructure of the iron-nickel austenitic alloy is equiaxed austenitic grains.

[0009] Furthermore, the mass ratios of nickel, iron, chromium, manganese, and titanium are respectively 8%–80%, 5%–80%, 14%–20%, 1%–2%, and 0%–3%.

[0010] Furthermore, the equiaxed austenite grains have a size of 15–25 μm.

[0011] Furthermore, the hardness of the iron-nickel austenitic alloy is 185-195 HV.

[0012] This invention also provides a rotary compressor, including a compressor housing as described in any of the preceding claims and a stator connected to the compressor housing.

[0013] Furthermore, the compressor housing and the stator are interference-fitted with an interference amount of 0.09 to 0.11 mm.

[0014] Furthermore, the lower end of the stator is provided with a support portion for supporting the stator.

[0015] Furthermore, the support portion is a C-shaped retaining ring, with both ends of the C-shaped retaining ring fixedly disposed on the stator, and the ring portion of the C-shaped retaining ring being interference-fitted with the compressor housing.

[0016] Furthermore, the C-shaped retaining ring comprises multiple stacked single pieces, and the thickness of each single piece is less than 0.3 mm.

[0017] Furthermore, the C-type retaining ring has a tensile strength greater than or equal to 850 MPa and an elongation of 20% to 25%.

[0018] Furthermore, the hardness of the compressor housing is less than that of the stator, and the hardness ratio of the compressor housing to the stator is 1:1.1 to 1:1.5.

[0019] This invention provides a compressor housing and a rotary compressor. The compressor housing is made of an iron-nickel austenitic alloy, the composition of which includes nickel, iron, chromium, manganese, and titanium. The microstructure of the iron-nickel austenitic alloy consists of equiaxed austenitic grains. This invention proposes a new housing material, namely, using an iron-nickel austenitic alloy to prepare the compressor housing. Compared with commonly used cold-rolled steel for housings, this iron-nickel austenitic alloy is non-magnetic, and therefore will not generate induced current with the stator core. This avoids increased iron loss and solves the problem of weak magnetic permeability in compressor housing materials, thereby improving the efficiency of the motor in the compressor. In addition, the microstructure of the iron-nickel austenitic alloy in the embodiments of the present invention is equiaxed austenitic grains. The material under the equiaxed austenitic grain structure is dense and uniform. This can ensure that the compressor housing and stator are completely non-magnetic, and the compressor housing is heated more uniformly during heat fitting. This reduces the adverse effect of uneven heating deformation of the compressor housing on the coaxiality of the stator, and further improves the motor efficiency of the compressor. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a rotary compressor provided in an embodiment of the present invention;

[0022] Figure 2 Metallographic image of an iron-nickel austenitic alloy for a compressor housing provided in an embodiment of the present invention;

[0023] Figure 3 for Figure 1 An enlarged schematic diagram of part A in the middle;

[0024] Figure 4 This is a schematic diagram of the structure of a C-type retaining ring in a rotary compressor provided by an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram showing the connection between a C-type retaining ring and the compressor housing and stator in a rotary compressor according to an embodiment of the present invention.

[0026] Markings in the image:

[0027] 1. Compressor housing;

[0028] 2. Stator;

[0029] 3. Support section. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0034] Please see below. Figure 1 This invention provides a compressor housing 1, which is made of an iron-nickel austenitic alloy. The composition of the iron-nickel austenitic alloy includes nickel, iron, chromium, manganese and titanium.

[0035] The microstructure of the iron-nickel austenitic alloy is equiaxed austenitic grains.

[0036] This embodiment proposes a novel housing material: a compressor housing 1 is made of an iron-nickel austenitic alloy. This alloy comprises nickel, iron, chromium, manganese, and titanium. Compared to commonly used cold-rolled steel housings, this iron-nickel austenitic alloy is non-magnetic, thus preventing the generation of induced currents with the stator core 2. This avoids increased iron losses and solves the problem of weak magnetic permeability in the compressor housing 1 material, improving the motor efficiency in the compressor. Furthermore, combined with… Figure 2 In this embodiment, the microstructure of the iron-nickel austenitic alloy is equiaxed austenitic grains. The equiaxed austenitic grain structure makes the material dense and uniform. This ensures that the compressor housing 1 and stator 2 are not magnetically conductive, and the compressor housing 1 is heated more evenly during heat fitting, thereby reducing the adverse effect of uneven heating deformation of the compressor housing 1 on the coaxiality of the stator 2.

[0037] In particular, the compressor housing 1 provided in this embodiment is especially suitable for rotary compressors, including but not limited to single-cylinder single-stage, double-cylinder single-stage, and double-cylinder variable-capacity rotary compressors. It should also be noted that, compared with existing iron-based stainless steel (Ni 6%-10%) and nickel-iron-based alloys (≥50%), the iron-nickel austenitic alloy in this embodiment has a wider range of Ni alloying elements (8%-80%), while removing alloying elements such as Si (silicon), N (nitrogen), Cu (copper), and Al (aluminum) from existing materials. The reason for this design is mainly that the most important reference indicator for the iron-nickel austenitic alloy in this embodiment is to obtain a non-magnetic austenitic structure, and the formation of the austenitic structure is mainly related to the Ni alloying element; therefore, the Ni content is designed to be 8%–80%. Other alloying elements such as Si, N, Cu, and Al are mainly used to improve the toughness and hardness of the material. However, for the application fields of the iron-nickel austenitic alloy in this embodiment, high strength and high hardness are not required. Therefore, the iron-nickel austenitic alloy in this embodiment is different from materials in the prior art (such as iron-based stainless steel and nickel-iron alloys).

[0038] In one specific embodiment, the mass ratios of nickel, iron, chromium, manganese, and titanium are 8%–80%, 5%–80%, 14%–20%, 1%–2%, and 0%–3%, respectively.

[0039] The composition of the iron-nickel austenitic alloy in this embodiment is: Ni 8%–80%, Fe 5%–80%, Cr 14%–20%, Mn 1%–2%, and Ti 0%–3%. For example, the mass ratio of Ni is 40%, the mass ratio of Fe is 40%, the mass ratio of Cr is 15%, the mass ratio of Mn is 2%, and the mass ratio of Ti is 3%.

[0040] In some optional embodiments, the composition of the iron-nickel austenitic alloy may also be: Ni 8%–80%, Fe 5%–70%, Cr 10%–30%, Mn 1%–4%, and Ti 0%–5%.

[0041] For example, the mass ratio of Ni is 40%, the mass ratio of Fe is 35%, the mass ratio of Cr is 20%, the mass ratio of Mn is 1%, and the mass ratio of Ti is 4.0%.

[0042] In some alternative embodiments, the composition of the iron-nickel austenitic alloy may also be: Ni 5%–85%, Fe 5%–80%, Cr 10%–20%, Mn 1%–5%, and Ti 0%–2%.

[0043] For example, the mass ratio of Ni is 50%, the mass ratio of Fe is 35%, the mass ratio of Cr is 10%, the mass ratio of Mn is 4%, and the mass ratio of Ti is 1%.

[0044] In some alternative embodiments, the composition of the iron-nickel austenitic alloy may also be: Ni 5%–85%, Fe 5%–80%, Cr 10%–20%, and Mn 1%–5%.

[0045] For example, the mass ratio of Ni is 50%, the mass ratio of Fe is 35%, the mass ratio of Cr is 10%, and the mass ratio of Mn is 5%.

[0046] In another specific embodiment, the equiaxed austenite grains have a size of 15–25 μm.

[0047] The iron-nickel austenitic alloy in this embodiment has an equiaxed austenitic grain microstructure with a grain size of 15–25 μm. Combined with... Figure 2 The material under this structure is uniform and dense, which allows the compressor housing 1 to be heated evenly during heat fitting, thereby reducing the adverse effect of housing deformation on the coaxiality of the stator 2.

[0048] Specifically, the size of the equiaxed austenite grains is 20 μm.

[0049] In another specific embodiment, the hardness of the iron-nickel austenitic alloy is 185-195 HV.

[0050] The hardness relationship between the iron-nickel austenitic alloy in this embodiment and existing cold-rolled steel is as follows:

[0051] HV 铁镍奥氏体合金 <HV 冷轧钢 ;

[0052] In other words, the hardness of the iron-nickel austenitic alloy in this embodiment is lower than that of existing cold-rolled steel. Specifically, the hardness of the iron-nickel austenitic alloy in this embodiment is preferably 185-195 HV, for example 190 HV, so that the hardness of the iron-nickel austenitic alloy in this embodiment is lower than that of conventional cold-rolled steel shell. This allows the compressor shell 1 to exert a smaller deformation force on the stator 2 of the contact parts after the same hot-fitting process, thereby further reducing the iron loss of the stator 2 after hot-fitting.

[0053] This invention also provides a rotary compressor, including a compressor housing 1 as described in any of the preceding claims and a stator 2 connected to the compressor housing 1.

[0054] like Figure 1 As shown, in this embodiment, the compressor housing 1, made of iron-nickel austenitic alloy, is connected to the stator 2 by an interference fit and a heat-fitted assembly. The heat-fitting assembly can prevent the deterioration of iron loss in the stator 2 and improve the compressor's energy efficiency.

[0055] In this embodiment, the compressor housing 1, made of iron-nickel austenitic alloy, is heat-fitted with the stator 2 via interference fitting. Compared to commonly used cold-rolled steel housings, the iron-nickel austenitic alloy compressor housing 1 is non-magnetic. Therefore, during interference fitting, it will not induce current with the iron core of the stator 2, thus avoiding increased iron loss in the iron core. This solves the problem of the compressor housing 1 material having weak magnetic permeability and improves the motor efficiency in the compressor. In addition, since the microstructure of the iron-nickel austenitic alloy is equiaxed austenitic grains, the material is dense and uniform under this equiaxed austenitic grain structure. This ensures that the compressor housing 1 and stator 2 are completely non-magnetic, and the heating uniformity of the compressor housing 1 during heat fitting is better. This reduces the adverse effect of uneven heating deformation of the compressor housing 1 on the coaxiality of the stator 2, further improving the motor efficiency of the compressor.

[0056] In a specific embodiment, the compressor housing 1 and the stator 2 are interference-fitted, with an interference amount of 0.09 to 0.11 mm.

[0057] The rotor compressor housing and motor stator 2 are connected by an interference fit, and the stator 2 is assembled by heat fitting or fixed to the housing by welding. The interference fit between the stator 2 and the housing needs to be within a certain range. If the interference is too small, the holding force between the stator 2 and the housing will be insufficient, and the housing will not be fully cooled and contracted after heat fitting, which may cause the stator 2 to shift downwards or even fall out of the housing when the workpiece is removed. If the interference is too large, the housing will deform due to excessive heating time, making it impossible to fit the stator 2 or causing excessive compression of the stator 2 and deformation of its inner diameter. Therefore, while ensuring that the stator 2 does not fall out, the smaller the interference design, the less stress the housing applies to the stator 2, the weaker the tendency of the stator 2 to deform, and the higher the motor efficiency. The existing interference design value between the cold-rolled steel housing and the silicon steel stator 2 is generally between 0.12mm and 0.2mm. In this embodiment, the interference fit between the iron-nickel austenitic alloy housing and the stator 2 is designed to be 0.09mm to 0.11mm. Compared with the existing interference fit between the housing and the stator 2 of 0.12mm to 0.2mm, the interference fit in this embodiment is smaller. This can reduce the stress applied by the compressor housing 1 to the stator 2, thereby weakening the deformation tendency of the stator 2 and further improving the motor efficiency of the compressor.

[0058] In one embodiment, the lower end of the stator 2 is provided with a support portion 3 for supporting the stator 2.

[0059] This embodiment, by designing parameters with a small interference fit between the compressor housing 1 and the stator 2, and combining this with the reinforcement method of the support part 3 at the bottom of the stator 2, can ensure that the stator 2 does not fall off after the compressor housing 1 and the stator 2 are heat-fitted, while reducing the stress of the compressor housing 1 on the stator 2 during heat fitting. This can reduce the deformation of the stator 2, thereby significantly reducing the industry bottleneck problem of increased iron loss of the stator 2 after heat fitting, and further improving the motor efficiency of the compressor.

[0060] Specifically, in combination Figure 3 and Figure 5 The support part 3 is a C-shaped retaining ring. The two ends of the C-shaped retaining ring are fixedly disposed on the stator 2. The ring part of the C-shaped retaining ring is tightly fitted with the compressor housing 1 by interference fit, and the outer diameter of the C-shaped retaining ring is the same as the inner diameter of the compressor housing 1.

[0061] Furthermore, the C-type retaining ring has a tensile strength greater than or equal to 850 MPa and an elongation of 20% to 25%.

[0062] In this embodiment, a C-shaped retaining ring is provided at the lower end of the stator 2. This C-shaped retaining ring is tightly fitted with the compressor housing 1 with an interference fit, and the outer diameter of the C-shaped retaining ring is consistent with the inner diameter of the upper housing of the compressor housing 1. This ensures that the compressor housing 1 and the stator 2 have a small interference fit design, while preventing the stator 2 from falling off. The C-shaped retaining ring can be made of high-strength stainless steel, giving it both excellent toughness and strength. This allows for elastic deformation, facilitating installation, and provides high strength to support the stator 2, ensuring that the stator 2 will not fall off.

[0063] The stator 2 is typically made of silicon steel, while the yield strength of the C-ring needs to be much greater than the tensile strength (360 MPa) of the silicon steel stator 2. The tensile strength of the C-ring is preferably greater than or equal to 650 MPa, with an elongation of 25%–35%. Here, yield strength refers to the yield limit of a metallic material when it undergoes yielding, that is, the stress that resists slight plastic deformation. For metallic materials without obvious yielding, the stress value that produces 0.2% residual deformation is defined as its yield limit, called the conditional yield limit or yield strength. External forces exceeding the yield strength will cause permanent and irreversible failure of the part. Tensile strength refers to the critical value at which a metal transitions from uniform plastic deformation to localized concentrated plastic deformation, and it is also the maximum load-bearing capacity of a metal under static tensile conditions. Tensile strength characterizes the resistance to maximum uniform plastic deformation of a material. Before the tensile specimen bears the maximum tensile stress, the deformation is uniform, but beyond that, the metal begins to exhibit necking, i.e., concentrated deformation. For brittle materials with no (or very little) uniform plastic deformation, it reflects the material's fracture resistance. The symbol is Rm (the old national standard GB / T 228-1987 specified tensile strength as σb), and the unit is MPa. Elongation refers to the percentage of the total deformation ΔL of the gauge length after tensile fracture of the specimen to the original gauge length L: δ=ΔL / L×100%. Elongation δ and reduction of section are indicators describing the plastic properties of materials. Cold-rolled strip steel after recrystallization annealing needs to be leveled to obtain the various properties required for delivery, and elongation, as the only deformation indicator in leveling rolling, plays a crucial role in ensuring the internal microstructure and properties of the strip steel.

[0064] In practical applications, the C-shaped retaining ring comprises multiple stacked single pieces, and the thickness of each single piece is less than 0.3 mm.

[0065] In this embodiment, multiple single pieces are stacked to form a C-shaped retaining ring with a certain thickness. The thickness of each single piece is less than 0.3 mm, and the number of single pieces is 5 to 6. The thickness of the C-shaped retaining ring formed by stacking them is 1.5 mm to 1.8 mm.

[0066] It should also be noted that the reason this embodiment does not directly use a single C-ring with a certain thickness, but instead uses multiple stacked single pieces, is because the C-ring is made of high-strength stainless steel. If the thickness of a single piece is too thick, the steel will not be able to deform elastically, making installation difficult and reducing the elasticity of the C-ring. Consequently, when the motor is running, the elastic buffering effect of the C-ring on the stator 2 will be weakened, increasing vibration and affecting motor operation. Therefore, designing a structure of multiple stacked thin rings ensures sufficient strength while maintaining sufficient elasticity, facilitating installation and buffering motor vibration.

[0067] In one embodiment, the hardness of the compressor housing 1 is less than the hardness of the stator 2, and the hardness ratio of the compressor housing 1 to the stator 2 is 1:1.1 to 1:1.5.

[0068] This embodiment optimizes the material relationship parameters between the housing and stator 2, selecting the optimal hardness and strength differences. This further reduces iron loss and improves motor efficiency. Specifically, when using the iron-nickel austenitic alloy housing of this embodiment, the corresponding stator 2 core must be made of silicon steel grade 35W360 with a thickness of 0.35mm. Under the same stator 2 structure, the thinner the silicon steel sheet, the better the performance. However, after the housing is heat-fitted, a thinner thickness is more susceptible to the effects of housing stress. With a thickness of 0.35mm and the housing of this invention, the iron loss is the lowest. The hardness of the iron-nickel austenitic alloy housing and the silicon steel of the stator 2 in this embodiment needs to meet the following requirements:

[0069] HV 铁镍奥氏体合金 <HV 定子 ;

[0070] HV 铁镍奥氏体合金 HV 定子 =1:1.1 to 1:1.5;

[0071] Under the aforementioned hardness conditions, the stator 2 exhibits minimal deformation after heat fitting, resulting in a significantly reduced decrease in motor efficiency and a substantial reduction in motor vibration and noise. Silicon steel sheet 35W360 is a soft magnetic material with high magnetic induction, high strength, and high conductivity, widely used in power, electronics, and communications fields. Its manufacturing process employs cold rolling and insulating coating technology, giving the silicon steel sheet excellent magnetic and mechanical properties. Silicon steel sheet 35W360 has high magnetic induction intensity, providing a strong magnetic field, making it suitable for high-power and high-frequency electronic devices. Furthermore, its good thermal conductivity and mechanical strength also make it an ideal material for motors, transformers, and other equipment. Specific technical parameters of silicon steel sheet 35W360 include:

[0072] 1. Material: 35W360 silicon steel sheet;

[0073] 2. Dimensions: Thickness 0.35mm, width 150mm, length 1200mm;

[0074] 3. Magnetic properties: Magnetic induction intensity B50≥1.72T, saturation magnetic induction intensity Bs≥1.82T;

[0075] 4. Resistivity: ρ≥80μΩ·cm;

[0076] 5. Hardness: HV≥200;

[0077] 6. Coating: Insulating coating, approximately 2-3 μm thick;

[0078] 7. Insulation resistance: ≥1000MΩ;

[0079] 8. Heat resistance: Maximum operating temperature 155℃;

[0080] 9. Corrosion resistance: It has good corrosion resistance and can withstand corrosive media in common environments.

[0081] Silicon steel sheet 35W360 is particularly suitable for motor manufacturing. Its high magnetic induction, high strength and good thermal conductivity make it an ideal material for motor manufacturing, such as generators and motors.

[0082] In the current compressor industry, the commonly used thicknesses of silicon steel sheets for stator 2 are 0.3mm, 0.35mm, and 0.5mm. Under the same structure, the thinner the thickness, the better the performance of the silicon steel. However, after the compressor housing 1 is heat-fitted, a thinner thickness is more susceptible to the effects of housing stress. In summary, when using the iron-nickel austenitic alloy housing in this embodiment, the silicon steel for stator 2 should be 0.35mm thick, and the grade should be S360. Furthermore, the hardness value should meet HV. 铁镍奥氏体合金 HV 定子 When the ratio is 1:1.2, the motor efficiency is highest after heat fitting of the material combination of the compressor housing 1 and stator 2.

[0083] The following provides several embodiments to compare the performance of the compressor housing 1 and the rotary compressor provided in this embodiment.

[0084] Example 1:

[0085] The compressor housing 1 is made of existing cold-rolled steel, and the stator 2's core uses A35mm stacked steel. The core silicon steel sheets are of grade 35W300. The housing and stator 2 are assembled with a 0.2mm interference fit. After heat fitting the stator 2, an iron loss meter is used to test the iron loss corresponding to the core design. Specific data are shown in Table 1. The iron loss meter used here is a specialized instrument for measuring core losses. It is mainly used to measure the energy loss generated by the core during operation, i.e., iron loss. Iron loss includes hysteresis loss and eddy current loss. These losses occur when energy storage devices such as transistors and cables can no longer store energy, resulting in energy waste in the core. The iron loss meter uses advanced modern technology and electronic instruments to measure core losses and magnetic flux density, thereby clarifying the power and losses borne by the core.

[0086] Example 2:

[0087] The structural dimensions of the compressor housing 1 and stator 2 are the same as in Example 1, but the material of the compressor housing 1 is iron-nickel austenitic alloy, and the silicon steel sheet of the stator 2 core is of grade 35W300. The housing and stator 2 are assembled with an interference fit of 0.2mm. After heat fitting the stator 2, the iron loss corresponding to the core scheme is tested using an iron loss meter. The specific data are shown in Table 1.

[0088] Example 3:

[0089] The compressor housing 1 and stator 2 have the same structural dimensions as in Example 1. The compressor housing 1 is made of iron-nickel austenitic alloy, and the core silicon steel sheet of stator 2 is made of grade 35W360. The housing and stator 2 are assembled with an interference fit of 0.2mm. After heat fitting the stator 2, the iron loss corresponding to the core scheme is tested using an iron loss meter. The specific data are shown in Table 1.

[0090] Example 4:

[0091] The compressor housing 1 and stator 2 have the same structural dimensions as in Example 1. The compressor housing 1 is made of iron-nickel austenitic alloy, and the core silicon steel sheet of stator 2 is made of grade 35W360. The housing and stator 2 are assembled with an interference fit of 0.1mm. After heat fitting the stator 2, the iron loss corresponding to the core scheme is tested using an iron loss meter. The specific data are shown in Table 1.

[0092] Example 5:

[0093] The compressor housing 1 and stator 2 have the same structural dimensions as in Example 1. The compressor housing 1 is made of the invented iron-nickel austenitic alloy, and the silicon steel sheets for the core of the stator 2 are made of grade 35W300. The housing and stator 2 are assembled with an interference fit of 0.1mm. After heat fitting the stator 2, the iron loss corresponding to the core scheme is tested using an iron loss meter. The specific data are shown in Table 1.

[0094]

[0095] Table 1

[0096] As can be seen from Table 1 above, the iron loss corresponding to Example 4 is the smallest. That is, the material of the compressor housing 1 is iron-nickel austenitic alloy, the silicon steel sheet of the stator 2 is 35W360 grade, and the housing and stator 2 are assembled with an interference fit of 0.1mm. The iron loss generated by the stator 2 core is the smallest, and correspondingly, the motor efficiency is the highest.

[0097] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0098] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A rotary compressor, characterized in that, Includes a compressor housing and a stator connected to the compressor housing; The compressor housing is made of an iron-nickel austenitic alloy, the composition of which includes nickel, iron, chromium, manganese, and titanium. The microstructure of the iron-nickel austenitic alloy consists of equiaxed austenitic grains. The mass ratios of nickel, iron, chromium, manganese, and titanium are 8%~80%, 5%~80%, 14%~20%, 1%~2%, and 0%~3%, respectively. The equiaxed austenitic grains have a size of 15~25 μm. The hardness of the iron-nickel austenitic alloy is 185~195 HV. The lower end of the stator is provided with a support portion for supporting the stator. The support portion is a C-shaped retaining ring. Both ends of the C-shaped retaining ring are fixedly disposed on the stator. The ring portion of the C-shaped retaining ring is interference-fitted with the compressor housing. The C-shaped retaining ring comprises multiple stacked single pieces, and the thickness of each single piece is less than 0.3 mm. The tensile strength of the C-shaped retaining ring is greater than or equal to 850 MPa, and the elongation is 20%~25%. The hardness of the compressor housing is less than the hardness of the stator, and the hardness ratio of the compressor housing to the stator is 1:1.1~1:1.

5.

2. The rotary compressor according to claim 1, characterized in that, The compressor housing is interference-fitted with the stator, with an interference amount of 0.09~0.11 mm.

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