A wear-resistant alloy material, compressor thrust portion, compressor lower flange structure

Abstract

The application provides a wear-resistant alloy material, a compressor thrust part and a compressor lower flange structure. The wear-resistant alloy material comprises the following chemical components in percentage by mass: C: 0.3-0.97 wt%; Cu: greater than 0 and less than or equal to 2.5 wt%; Mn: greater than 0 and less than or equal to 0.38 wt%; S: greater than 0 and less than or equal to 0.22 wt%; Mo: greater than 0 and less than or equal to 0.8 wt%; P: greater than 0 and less than or equal to 0.52 wt%; and the balance is Fe. The wear-resistant alloy material has better wear resistance and friction reduction, and can be used in the compressor lower flange structure. The compressor lower flange structure adopting the wear-resistant alloy material effectively reduces the wear of the end surface of the compressor thrust part, improves the stability and reliability of the thrust part, and enables the thrust part to bear a larger number of rotor compressors, thereby improving the reliability and service life of the compressor.

Description

Technical Field

[0001] This invention belongs to the field of alloy materials and compressor technology, specifically relating to a wear-resistant alloy material, a compressor thrust section, and a compressor lower flange structure. Background Technology

[0002] like Figure 1 As shown, the rolling rotor compressor is widely used in the field of household air conditioning due to its simple structure and high energy efficiency. The internal structure of the rolling rotor compressor mainly consists of two parts: the pump body assembly and the motor assembly. The pump body assembly mainly consists of core components such as the upper flange 300, the lower flange 500, the crankshaft 200, the cylinder 400, the roller 600, and the vanes. The motor rotor 100 is interference-fitted onto the upper end of the long shaft portion 210 of the crankshaft. The upper flange 300 and the lower flange 500 are fitted with the long shaft portion 210 and the short shaft portion 230 of the crankshaft. The cylinder 400 is fixed between the upper flange 300 and the lower flange 500. The roller 600 is sleeved on the eccentric portion 220 of the crankshaft. As the crankshaft 200 rotates, the eccentric portion 220 drives the roller 600 to rotate within the cylinder.

[0003] The crankshaft 200 includes a long shaft section 210, a short shaft section 230, an eccentric section 210, and a crankshaft thrust section 240. Most conventional rotary compressors have crankshafts with this structural feature. However, compared to a conventional single-cylinder compressor, a twin-cylinder rotary compressor has two eccentric sections arranged at 180° on its crankshaft, and only one thrust section. The crankshaft thrust section is a crescent-shaped, precision-machined surface that directly mates with the upper end face of the lower flange to form a sliding friction pair, used to balance the weight of the motor rotor and crankshaft, as well as the axial unbalanced forces during operation. Whether it's a single-cylinder, twin-cylinder, or three-cylinder compressor, the axial forces are concentrated in the crankshaft thrust section and supported by the lower flange.

[0004] The lower flange includes a secondary bearing section and a fixed section. The fixed section contains a large, precision-machined flat surface, and a local flat surface near the secondary bearing section forms a thrust-resistant sliding friction pair with the thrust section of the crankshaft. Currently, in existing technology, the lower flange is generally made of gray cast iron, and the thrust surfaces of the secondary bearing section and the fixed section are also made of gray cast iron. Although existing gray cast iron has excellent performance and low price, making it the most commonly used material in compressors, as compressor displacement increases (i.e., axial load increases) and speeds increase, all axial forces act on the thrust surface of the lower flange. Wear of the thrust surface is one of the most common failure modes. Due to the limited wear resistance and friction reduction properties of existing gray cast iron, it can no longer meet the long-term, high-reliability requirements of compressors.

[0005] On the other hand, due to the increased displacement and speed of rotary compressors, a larger motor is required to drive them, resulting in a corresponding increase in the mass of the motor and crankshaft. This reduces the overall stability of the compressor's shaft system at high speeds, which in turn exacerbates wear and collisions between the crankshaft's eccentric portion and the lower flange, leading to increased noise, abnormal wear, and ultimately a gradual deterioration in the compressor's performance and reliability. Therefore, it is necessary to further improve the existing lower flange material.

[0006] Existing structures for the thrust section of compressors include the following: One improvement proposes a buffer structure in the crankshaft thrust section using wear-resistant material; however, it does not specify the type of wear-resistant material or its fixing method. Considering the irregular structure, small size, and limited space of the crankshaft thrust surface, this structure has poor feasibility. A second improvement proposes a clearance fit between the thrust ring and the annular groove, transforming the original single pair of sliding friction pairs into multiple pairs, increasing the number of friction pairs and frictional power consumption. A third improvement proposes a tapered thrust structure in the crankshaft main bearing area, with the tapered thrust surface fitting with the upper flange tapered hole. The thrust section is connected via threads in the main bearing area; however, the stability of the threaded connection needs improvement, and the tapered surface fit requires high machining precision, making machining difficult. A fourth improvement discloses multiple spiral lubricating oil grooves in the thrust surface; however, the spiral oil grooves are structurally complex, difficult to machine, and result in low reliability and stability. The fifth improvement technology is as follows: Similar in structure to the fourth improvement technology, this structure limits different oil groove sizes and parameters. However, the spiral oil groove structure remains complex, difficult to manufacture, and leads to low reliability and stability. The sixth improvement technology proposes an elastic thrust structure with short shaft end face support. While the thrust-stopping effect needs improvement, the stability of the elastic thrust is not high. In summary, the current design of the compressor thrust section has poor rationality and feasibility, and is difficult to manufacture, resulting in low compressor reliability and stability.

[0007] In summary, the existing technology has at least the following technical problems:

[0008] (1) Existing wear-resistant alloy materials have low wear resistance and wear reduction properties, and are not suitable for manufacturing the lower flange structure of rotary compressors.

[0009] (2) The existing rotor compressor lower flange structure has low wear resistance and wear reduction properties, making it difficult to meet the high speed requirements of large-horsepower rotor compressors.

[0010] (3) Existing rotary compressors are prone to abnormal wear of their thrust section and flange thrust end face, which may lead to higher noise, reduced performance and reliability of the compressor; the existing compressor thrust section structure design is not reasonable and feasible, and the processing is difficult, resulting in low reliability and stability of the compressor. Summary of the Invention

[0011] In view of this, the present invention provides a wear-resistant alloy material, a compressor thrust part, and a compressor lower flange structure. The main purpose is to provide a wear-resistant alloy material that can solve the problem that the existing wear-resistant alloy materials have low wear resistance and friction reduction properties and are not suitable for manufacturing the lower flange structure of a rotary compressor.

[0012] To address the aforementioned problems, this invention provides a wear-resistant alloy material, comprising the following chemical composition by mass percentage: C: 0.3-0.97 wt%; Cu: greater than 0 and less than or equal to 2.5 wt%; Mn: greater than 0 and less than or equal to 0.38 wt%; S: greater than 0 and less than or equal to 0.22 wt%; Mo: greater than 0 and less than or equal to 0.8 wt%; P: greater than 0 and less than or equal to 0.52 wt%; with the balance being Fe.

[0013] The aforementioned wear-resistant alloy material, by mass percentage, comprises the following chemical composition: C 0.51-0.72wt%, Cu 1.0-2.0wt%, Mn 0.25-0.38wt%, S 0.15-0.22wt%, Mo 0.4-0.6wt%, P 0.24-0.52wt%, with the balance being Fe.

[0014] The aforementioned wear-resistant alloy material has a hardness of 70-110 HRB.

[0015] The aforementioned wear-resistant alloy material has a uniformly distributed porous structure.

[0016] The aforementioned wear-resistant alloy material has a porosity of 5.4-10.8%; and / or

[0017] The pore size of wear-resistant alloy materials is no greater than 200μm.

[0018] The aforementioned wear-resistant alloy material has a density of 6.6-7.0 g / cm³. 3 .

[0019] The aforementioned wear-resistant alloy material has a uniform lamellar pearlite structure, and / or contains MnFe and Mo2S to improve wear reduction properties.

[0020] This invention also provides a method for preparing a wear-resistant alloy material, the method comprising the following steps:

[0021] Step 1): Weigh out each raw material according to the mass percentage of 0.3-0.97wt% C, 0-2.5wt% Cu, 0-0.6wt% MnS, 0-0.8wt% Mo, 0-2.0wt% iron phosphate powder, with the remainder being Fe. Mix and disperse the raw materials to obtain a mixed powder.

[0022] Step 2): The mixed powder is molded to obtain alloy ingredients;

[0023] Step 3): The alloy ingredients are sintered to obtain wear-resistant alloy materials.

[0024] In the aforementioned method for preparing a wear-resistant alloy material, in step 1), the iron-phosphorus powder comprises the following chemical composition by mass percentage: P 24-26%, C 0.85-1.15%, with the balance being Fe.

[0025] In the aforementioned method for preparing a wear-resistant alloy material, in step 1), the weighed raw materials are placed into a ball mill for mixing and dispersion, and the mixing and dispersion time is controlled to be 60-120 min.

[0026] In the aforementioned method for preparing a wear-resistant alloy material, in step 3), the alloy ingredients are sintered at a temperature of 1100-1250℃ for a time of 40-60 minutes to obtain the wear-resistant alloy material.

[0027] The present invention also provides a compressor thrust member, which is made of the aforementioned wear-resistant alloy material.

[0028] The present invention also provides a compressor lower flange structure, wherein the compressor lower flange structure is provided with a lower flange thrust portion for interacting with the crankshaft, wherein the lower flange thrust portion is made of the aforementioned wear-resistant alloy material.

[0029] The aforementioned compressor lower flange structure includes a flange and a lower flange thrust portion; wherein, a mounting groove is provided at the upper end of the flange; the lower flange thrust portion is installed in the mounting groove; and the lower flange thrust portion has an inner hole, and correspondingly, both the mounting groove and the flange have through holes communicating with the inner hole to allow the crankshaft to pass through.

[0030] In the aforementioned compressor lower flange structure, the thrust portion of the lower flange is set in the mounting groove with an interference fit.

[0031] In the aforementioned compressor lower flange structure, the interference fit between the thrust portion of the lower flange and the mounting groove is 0.010-0.050mm.

[0032] The aforementioned compressor lower flange structure has a ring-shaped thrust portion.

[0033] The aforementioned compressor lower flange structure has a thrust portion whose structural design satisfies the following formula (1);

[0034] 2r≤D2≤(D+5) (1);

[0035] And / or, the structural design of the thrust section of the lower flange satisfies the following formula (2):

[0036] H1= (0.3~1) ×(D2-D1) / 2 (2);

[0037] Where D1 is the inner diameter of the thrust section of the lower flange, D2 is the outer diameter of the thrust section of the lower flange, H1 is the height of the thrust section of the lower flange, D is the inner diameter of the cylinder, and r is the maximum radius of the thrust section of the crankshaft.

[0038] Compared with the prior art, the wear-resistant alloy material, compressor thrust section, and compressor lower flange structure provided by the present invention have at least the following beneficial effects.

[0039] This invention provides a wear-resistant alloy material, comprising the following chemical components by mass percentage: C: 0.3-0.97 wt%; Cu: greater than 0 and less than or equal to 2.5 wt%; Mn: greater than 0 and less than or equal to 0.38 wt%; S: greater than 0 and less than or equal to 0.22 wt%; Mo: greater than 0 and less than or equal to 0.8 wt%; P: greater than 0 and less than or equal to 0.52 wt%; with the balance being Fe. Compared with traditional wear-resistant materials, the wear-resistant alloy material proposed in this invention adds MnS and Mo to the raw materials, forming a certain amount of MnFe and Mo2S. Furthermore, the wear-resistant alloy material of this invention can form a beneficial porous structure, giving the surface of the wear-resistant material excellent oil-retaining function. Through the synergistic effect of the formed MnFe, Mo2S, and porous structure, the friction-reducing performance of the wear-resistant alloy material is improved. Simultaneously, this invention adds iron phosphate powder (comprising P, C, and Fe) to the raw materials; the reasonable addition of P can improve the wear resistance of the wear-resistant alloy material. In summary, the wear-resistant alloy material of the present invention has excellent wear resistance, friction reduction properties, and strength, and can be used to manufacture wear-resistant materials for the lower flange structure of compressors.

[0040] Furthermore, the wear-resistant alloy material of the present invention, due to its porous structure, possesses a porous oil-retaining function. When used in workpieces, the wear-resistant alloy material of the present invention can effectively avoid the need for processes such as grooving to improve oil retention in order to enhance friction reduction, thereby simplifying the process.

[0041] Furthermore, metallographic analysis of the wear-resistant alloy material through corrosion revealed a uniform lamellar pearlite structure. The addition of Cu, combined with the composition and proportions of other elements, refined the pearlite structure, resulting in lamellar thicknesses generally within 1 μm. This uniform lamellar pearlite structure indicates good overall mechanical and tribological properties. Simultaneously, Mn, Mo, and P form solid solution reinforcement with iron, further enhancing the wear resistance of the alloy material.

[0042] On the other hand, the wear-resistant alloy material obtained by the present invention through powder pressing and sintering is porous. Powder forming differs from the smelting of steel and iron. The sintering of wear-resistant alloy materials involves first forming a green blank under pressure. The density of the green blank differs from the theoretical density, meaning there is porosity, which results in the wear-resistant alloy material being porous. The porosity of the wear-resistant alloy material is 5.4-10.8%, and the pore size is no greater than 200 μm. Based on this, the density of the wear-resistant alloy material of the present invention is 6.6-7.0 g / cm³. 3 .

[0043] On the other hand, since thrust wear is one of the important failure modes of compressors, using the wear-resistant alloy material of this invention as the thrust material of the compressor can reduce the frequency of abnormal wear on the thrust end face, leveraging the high wear resistance and friction reduction properties of the compressor thrust part. This also reduces the noise generated by friction in the compressor, thereby improving its performance and reliability. Consequently, it can enhance the performance and service life of air conditioning equipment.

[0044] On the other hand, the thrust portion in the compressor lower flange structure of the present invention uses the aforementioned wear-resistant alloy material. Due to its superior wear resistance, friction reduction properties, strength, and hardness, this thrust portion can support a larger horsepower rotor compressor. Furthermore, the present invention provides a mounting groove in the lower flange and then fixes the wear-resistant material into the mounting groove using an interference fit, simplifying the processing steps and improving feasibility; thus, the reliability and stability of the compressor are improved. Attached Figure Description

[0045] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0046] Figure 1 This is a cross-sectional schematic diagram of the pump body assembly of a rotary compressor in the prior art;

[0047] Figure 2This is a metallographic image of the wear-resistant alloy material of the present invention before corrosion.

[0048] Figure 3 This is a SEM image of the wear-resistant alloy material of the present invention after corrosion;

[0049] Figure 4 This is a schematic diagram of the lower flange structure of the compressor of the present invention;

[0050] Figure 5 This is a partially enlarged schematic diagram of the thrust stop portion of the present invention;

[0051] Figure 6 This is a schematic diagram of the thrust portion with different structural parameters according to the present invention.

[0052] Among them, 100. motor, 200. crankshaft, 300. upper flange, 400. cylinder, 500. lower flange, 600. roller;

[0053] 210. Long shaft section; 220. Eccentric section; 230. Short shaft section; 240. Crankshaft thrust section;

[0054] 510. Lower flange thrust section, 511. Thrust section center hole, 520. Fixing section, 530. Bearing section, 531. Bearing section center hole. Detailed Implementation

[0055] 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 embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0056] This invention proposes a wear-resistant alloy material, a compressor thrust section, and a compressor lower flange structure. The main inventive concept is as follows: The wear-resistant alloy material of this invention incorporates Mo, MnS, and iron phosphate powder in its raw materials. Since Mo and P can form solid solutions with Fe, they provide solid solution strengthening. Furthermore, Mo is a carbide-forming element, thus improving the hardness and wear resistance of the wear-resistant alloy material. The addition of MnS and Mo results in the formation of a certain amount of MnFe and Mo2S in the wear-resistant alloy material. Moreover, the wear-resistant alloy material of this invention can form a favorable porous structure, giving it excellent oil storage capacity. Due to the synergistic effect between the formed MnFe, Mo2S, and the porous structure, the friction-reducing performance of the wear-resistant alloy material is further improved.

[0057] The main solution of the present invention is as follows:

[0058] According to embodiments of the present invention, a wear-resistant alloy material is provided, comprising the following chemical composition by mass percentage: C: 0.3-0.97 wt%; Cu: greater than 0 and less than or equal to 2.5 wt%; Mn: greater than 0 and less than or equal to 0.38 wt%; S: greater than 0 and less than or equal to 0.22 wt%; Mo: greater than 0 and less than or equal to 0.8 wt%; P: greater than 0 and less than or equal to 0.52 wt%; with the balance being Fe.

[0059] Furthermore, by mass percentage, the wear-resistant alloy material comprises the following chemical composition: C 0.51-0.72wt%, Cu 1.0-2.0wt%, Mn 0.25-0.38wt%, S 0.15-0.22wt%, Mo 0.4-0.6wt%, P 0.24-0.52wt%, with the balance being Fe.

[0060] Furthermore, the hardness of wear-resistant alloy materials is 70-110 HRB.

[0061] The wear-resistant alloy material of the present invention improves the strength of the wear-resistant alloy material by adding a certain amount of Mo, and Mo, together with Mn and P, forms solid solution strengthening with iron, thereby improving the matrix hardness of the wear-resistant alloy material, so that the hardness of the wear-resistant alloy material can reach 70-110 HRB, thereby further improving the wear resistance of the wear-resistant alloy material.

[0062] Furthermore, the wear-resistant alloy material exhibits a uniformly distributed porous structure.

[0063] Furthermore, the porosity of the wear-resistant alloy material is 5.4-10.8%, and / or the pore size of the wear-resistant alloy material is not greater than 200 μm.

[0064] Furthermore, the density of the wear-resistant alloy material is 6.6-7.0 g / cm³. 3 .

[0065] The wear-resistant alloy material of this invention can form a favorable porous structure, with a porosity of 5.4-10.8% and a pore size not exceeding 200 μm; preferably, the pore size is 20-80 μm. The porous structure enhances the oil retention capacity of the material surface, thereby improving friction reduction. Therefore, the wear-resistant alloy material of this invention possesses excellent comprehensive properties, including tribological properties.

[0066] Furthermore, the wear-resistant alloy material has a uniform lamellar pearlite structure, and / or contains MnFe and Mo2S to improve wear resistance.

[0067] By adding Cu and combining it with other elements in the composition and ratio, the wear-resistant alloy material forms a uniform lamellar pearlite structure, with the thickness of the lamellars generally within 1 μm. Since the lamellar pearlite structure can improve the mechanical and tribological properties of the material, the wear-resistant alloy material of this invention has good tribological and mechanical properties.

[0068] The wear-resistant alloy material of this invention incorporates MnS and Mo into the raw materials, resulting in the formation of a certain amount of MnFe and Mo2S. Furthermore, the addition of ferrophosphorus powder to the raw materials enhances the wear resistance and friction reduction properties of the alloy. Simultaneously, the wear-resistant alloy material forms a uniform lamellar pearlite structure and / or forms MnFe and Mo2S, further improving friction reduction. Therefore, this wear-resistant alloy material can be used to manufacture the thrust section (i.e., the wear-resistant section) of the lower flange structure of a compressor.

[0069] This invention also provides a method for preparing a wear-resistant alloy material, comprising the following steps:

[0070] Step 1): Weigh out each raw material according to the mass percentage of 0.3-0.95wt% C, 0-2.5wt% Cu, 0-0.6wt% MnS, 0-0.8wt% Mo, 0-2.0wt% iron phosphate powder, with the remainder being Fe. Mix and disperse the raw materials to obtain a mixed powder.

[0071] Step 2): The mixed powder is molded to obtain alloy ingredients;

[0072] Step 3): The alloy ingredients are sintered to obtain wear-resistant alloy materials.

[0073] It should be noted that, compared with general wear-resistant alloy materials, most of which contain strong carbide elements such as Cr, Ni, and Mo, the wear-resistant alloy material in this invention is strengthened by conventional sintering without special heat treatment such as quenching, which can improve its wear resistance and friction reduction properties. Thus, the wear-resistant alloy material of this invention can simplify the process and improve the preparation efficiency.

[0074] Of course, depending on actual needs, in order to obtain wear-resistant alloy materials with higher strength, higher hardness, and higher wear resistance, the wear-resistant alloy materials can be further subjected to strengthening heat treatments such as quenching and normalizing to improve the performance of the materials.

[0075] Further, in step 1): by mass percentage, the iron-phosphorus powder comprises the following chemical composition: P 24-26%, C 0.85-1.15%, with the balance being Fe (in subsequent embodiments, the iron powder is atomized powder, but it can also be reduced powder according to actual needs).

[0076] Further, in step 1): the weighed raw materials are placed in a ball mill for mixing and dispersion. As a reasonable option, the mixing and dispersion time can be controlled to be 60-120 minutes, which can make the mixed raw materials more uniform. Under actual working conditions, the mixed powder can be placed in a hydraulic press and molded at room temperature to obtain alloy ingredients.

[0077] Further, as an example, in step 3): the alloy ingredients are sintered at a temperature of 1100-1250℃, and the sintering time is controlled to be 40-60 minutes to obtain a wear-resistant alloy material.

[0078] Furthermore, the wear-resistant alloy material obtained through the above process has a uniformly distributed porous structure, and the density of this wear-resistant alloy material is 6.6-7.0 g / cm³. 3 The wear-resistant alloy material has a hardness of 70-110 HRB. It has excellent wear resistance, friction reduction, and strength properties, and can be used to make wear-resistant materials in the lower flange structure of compressors.

[0079] On the other hand, the present invention also provides a compressor thrust member, which is made of the aforementioned wear-resistant alloy material.

[0080] Based on the advantages of using the high wear resistance and wear-reducing wear-resistant alloy material of this invention in the thrust section of the compressor, abnormal wear of the thrust end face inside the compressor can be effectively reduced, and the noise generated by the compressor due to friction can be reduced, thereby improving the reliability of the compressor and thus improving the performance and service life of the air conditioning equipment.

[0081] It should be noted that the compressor thrust section includes parts of the compressor that are prone to wear, such as the crankshaft thrust section 240, the upper flange thrust section, and the lower flange thrust section 510. Based on this, the wear-resistant alloy material of the present invention can be reasonably applied to these parts as needed to reduce the amount of wear on these parts, thereby improving the performance of the compressor.

[0082] On the other hand, the present invention also provides a compressor lower flange structure, wherein the compressor lower flange structure is provided with a lower flange thrust portion 510 for interacting with the crankshaft 200, wherein the lower flange thrust portion 510 is made of the aforementioned wear-resistant alloy material.

[0083] Furthermore, the compressor lower flange structure includes a flange and a lower flange thrust portion 510; wherein, a mounting groove is provided at the upper end of the flange; the lower flange thrust portion 510 is installed in the mounting groove; and the lower flange thrust portion 510 has an inner hole, and correspondingly, both the mounting groove and the flange have through holes communicating with the inner hole to allow the crankshaft 200 to pass through.

[0084] Furthermore, the lower flange thrust portion 510 of the present invention is provided on the flange by an interference fit; the interference fit of the lower flange thrust portion 510 relative to the mounting groove is 0.010-0.050mm.

[0085] like Figure 4 and Figure 5 As shown, the compressor lower flange structure of the present invention includes a flange member and a lower flange thrust portion 510. The compressor lower flange structure includes a flange member and a lower flange thrust portion 510. A mounting groove is provided at the upper end of the flange member; the lower flange thrust portion 510 is installed in the mounting groove; and the thrust portion has a thrust portion center hole 511; the thrust portion center hole 511 communicates with the bearing portion center hole 531 at the lower end of the flange member, so that the short shaft portion 230 of the crankshaft 200 can pass through. A through hole is formed between the thrust portion center hole 511 and the bearing portion center hole 531. A bearing is installed in the upper part of the through hole, and the crankshaft 200 passes through the through hole to connect to the short shaft portion 230.

[0086] The flange of the present invention includes an integrally formed bearing portion 530 and a fixing portion 520. The bearing portion 530 and the fixing portion 520 have an annular mounting groove around the central hole 531 of the bearing portion on the surface near the crankshaft 200. The lower flange thrust portion 510 is also correspondingly machined into an annular structure. The lower flange thrust portion 510 is then fixed in the annular mounting groove by an interference fit. It should be noted that in actual operation, the lower flange thrust portion 510 can also be positioned in the mounting groove by riveting, welding, or other fitting methods as needed.

[0087] By using the wear-resistant alloy material of this invention, the lower flange thrust portion 510 in the compressor lower flange structure of this invention possesses good wear resistance, friction reduction properties, strength, and hardness, thereby enabling the compressor lower flange structure to support larger horsepower rotary compressors. Furthermore, the lower flange of this invention has a pre-reserved annular mounting groove. The outer diameter of the lower flange thrust portion 510 (wear-resistant ring), made of wear-resistant alloy material, is slightly larger than the annular mounting groove. The lower flange thrust portion 510 is press-fitted into the annular mounting groove using a press. This invention installs the lower flange thrust portion 510 through an interference fit, preventing the lower flange thrust portion 510 from moving along its axial or radial direction, thereby improving the reliability and stability of the rotary compressor.

[0088] Furthermore, the structural design of the lower flange thrust section 510 satisfies the following formula (1);

[0089] 2r≤D2≤(D+5) (1);

[0090] Where D1 is the inner diameter of the thrust section, D2 is the outer diameter of the thrust section, H1 is the height of the thrust section, D is the inner diameter of the cylinder, and r is the maximum radius of the crankshaft thrust section.

[0091] like Figure 6 As shown, as a specific embodiment, Figure 6 In actual operation, there are three structural designs for the thrust member: First, the maximum outer diameter D2 of the thrust member is equal to or greater than the cylinder diameter D by no more than 5mm. This allows the lower end face of the cylinder to press against the upper surface of the lower flange thrust member 510, making the fixation of the lower flange thrust member 510 more reliable. Second, the maximum outer diameter D2 of the thrust member is greater than the maximum diameter 2r of the crankshaft eccentric thrust member but less than the cylinder diameter D. Third, the maximum outer diameter D2 of the thrust member is equal to the maximum diameter 2r of the crankshaft eccentric thrust member. Based on the consideration of the thrust member's performance, all three structural forms ensure that the thrust member can effectively support the thrust surface of the crankshaft during 360° rotation. This structure ensures that the crankshaft thrust member 240 can effectively contact the lower flange thrust member 510 during 360° rotation. By controlling the maximum outer diameter of the thrust section to (D+5), the effective thrust area of ​​the thrust section 510 of the lower flange can be guaranteed, which can improve the wear between the lower end face of the roller 600 and the thrust section 510 of the lower flange.

[0092] In actual operation, the structural design of the thrust section 510 of the lower flange satisfies the following formula (2):

[0093] H1= (0.3~1) ×(D2-D1) / 2 (2);

[0094] Where D1 is the inner diameter of the thrust section of the lower flange, D2 is the outer diameter of the thrust section of the lower flange, H1 is the height of the thrust section of the lower flange, D is the inner diameter of the cylinder, and r is the maximum radius of the thrust section of the crankshaft.

[0095] Based on considerations of installation stability and reliability, this invention designs the dimensional ratio of the lower flange thrust portion 510 to its radial direction. This effectively ensures the stability and reliability of the lower flange thrust portion 510 structure.

[0096] The thrust-resistant portion 510 of the lower flange of the present invention, made of the aforementioned high-performance wear-resistant alloy material and combined with the optimized design of the structural dimensions, can effectively improve the thrust-resistant effect of the compressor's lower flange structure, thereby improving the overall performance of the compressor. Furthermore, it enables the compressor to meet the high-speed operation requirements of large-horsepower rotary compressors, thus reducing abnormal wear and high noise caused by the high speed of large-horsepower rotary compressors, resulting in superior compressor performance.

[0097] The following detailed description of the wear-resistant alloy material, compressor thrust section, and compressor lower flange structure of the present invention will be provided through specific embodiments and comparative examples.

[0098] Example 1

[0099] This embodiment describes the preparation of a wear-resistant alloy material. The process includes the following steps:

[0100] Mixing powder: First, weigh out 0.3% C, 2.5% Cu, 0.6% MnS, 0.8% Mo, 2.0% ferrophosphorus powder, and the remainder as iron powder by mass percentage. After mixing, place the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to be 90 min to obtain mixed powder.

[0101] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0102] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0103] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0104] C 0.3%, Cu 2.5%, Mn 0.38%, S 0.22%, Mo 0.8%, P 0.5%, balance Fe.

[0105] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0106] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0107] Example 2

[0108] This embodiment describes the preparation of a wear-resistant alloy material. The process includes the following steps:

[0109] Powder mixing: First, weigh out 0.5% C, 2.0% Cu, 0.6% MnS, 0.8% Mo, 2.0% ferrophosphorus powder, and the remainder as iron powder by mass percentage. After mixing, place the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to be 90 min to obtain mixed powder.

[0110] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0111] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0112] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0113] C 0.5%, Cu 2.0%, Mn 0.38%, S 0.22%, Mo 0.8%, P 0.5%, balance Fe.

[0114] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0115] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0116] Example 3

[0117] This embodiment describes the preparation of a wear-resistant alloy material. The process includes the following steps:

[0118] Mixing powder: First, weigh out 0.5% C, 1.0% Cu, 0.4% MnS, 0.5% Mo, 1.0% ferrophosphorus powder, and the remainder as iron powder by mass percentage. After mixing, put the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to be 90 min to obtain mixed powder.

[0119] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0120] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0121] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0122] C 0.5%, Cu 1.0%, Mn 0.33%, S 0.15%, Mo 0.5%, P 0.25%, balance Fe.

[0123] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0124] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0125] Example 4

[0126] This embodiment describes the preparation of a wear-resistant alloy material. The process includes the following steps:

[0127] Mixing powder: First, weigh out 0.5% C, 1.5% Cu, 0.4% MnS, 0.5% Mo, 1.5% ferrophosphorus powder, and the remainder as iron powder by mass percentage. After mixing, put the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to be 90 min to obtain mixed powder.

[0128] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0129] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0130] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0131] C 0.5%, Cu 1.5%, Mn 0.25%, S 0.15%, Mo 0.5%, P 0.38%, balance Fe.

[0132] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0133] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0134] Example 5

[0135] This embodiment describes the preparation of a wear-resistant alloy material. The process includes the following steps:

[0136] Powder mixing: First, weigh out 0.5% C, 1.5% Cu, 0.6% MnS, 0.3% Mo, 1.0% ferrophosphorus powder, and the remainder as iron powder by mass percentage. After mixing, place the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to be 90 min to obtain mixed powder.

[0137] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0138] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0139] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0140] C 0.5%, Cu 1.5%, Mn 0.38%, S 0.22%, Mo 0.3%, P 0.25%, balance Fe.

[0141] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0142] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0143] Example 6

[0144] This embodiment describes the preparation of a wear-resistant alloy material. The process includes the following steps:

[0145] Powder mixing: First, weigh out 0.7% C, 2.0% Cu, 0.6% MnS, 0.6% Mo, 1.5% P, and the remainder as iron powder by mass percentage. After mixing, put the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to 90 minutes to obtain mixed powder.

[0146] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0147] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0148] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0149] C 0.7%, Cu 2%, Mn 0.25%, S 0.15%, Mo 0.5%, P 0.38%, balance Fe.

[0150] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0151] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0152] Example 7

[0153] This embodiment describes the preparation of a wear-resistant alloy material. The process includes the following steps:

[0154] Powder mixing: First, weigh out 0.95% C, 1.0% Cu, 0.6% MnS, 0.8% Mo, 0.5% P, and the remainder as iron powder by mass percentage. After mixing, put the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to 90 minutes to obtain mixed powder.

[0155] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0156] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0157] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0158] C 0.95%, Cu 1.0%, Mn 0.38%, S 0.22%, Mo 0.8%, P 0.13%, balance Fe.

[0159] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0160] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0161] Comparative Example 1

[0162] This comparative example prepares a wear-resistant alloy material. The process includes the following steps:

[0163] Powder mixing: First, weigh out 0.3% C, 2.5% Cu, 0.6% MnS, 0.8% Mo, and the remainder iron powder by mass percentage. After mixing, place the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to be 90 min to obtain mixed powder.

[0164] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0165] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0166] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0167] C 0.3%, Cu 2.5%, Mn 0.38%, S 0.22%, Mo 0.8%, balance Fe.

[0168] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0169] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0170] Comparative Example 2

[0171] This comparative example prepares a wear-resistant alloy material. The process includes the following steps:

[0172] Mixing powder: First, weigh out 0.5% C, 0.4% MnS, 0.8% Mo, 2.0% ferrophosphorus powder, and the remainder iron powder by mass percentage. After mixing, put the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to be 90 min to obtain mixed powder.

[0173] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0174] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0175] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0176] C 0.5%, Mn 0.25%, S 0.15%, Mo 0.8%, P 0.5%, balance Fe.

[0177] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0178] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0179] Comparative Example 3

[0180] This comparative example prepares a wear-resistant alloy material. The process includes the following steps:

[0181] Powder mixing: First, weigh out 0.5% C, 2.5% Cu, 2.0% phosphorus iron powder, and the remainder iron powder by mass percentage. After mixing, put the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to be 90 min to obtain mixed powder.

[0182] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0183] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0184] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0185] C 0.3%, Cu 2.5%, P 0.5%, balance Fe.

[0186] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0187] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0188] Comparative Example 4

[0189] This comparative example prepares a wear-resistant alloy material. The process includes the following steps:

[0190] Mixing powder: First, weigh out 0.7% C, 0.4% MnS, 0.4% Mo, 1.5% ferrophosphorus powder, and the remainder iron powder by mass percentage. After mixing, put the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to 90 minutes to obtain mixed powder.

[0191] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0192] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0193] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0194] C 0.7%, Mn 0.25%, S 0.15%, Mo 0.4%, P 0.38%, balance Fe.

[0195] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0196] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0197] Comparative Example 5

[0198] This comparative example prepares a wear-resistant alloy material. The process includes the following steps:

[0199] Powder mixing: First, weigh out 0.7% C, 1.5% Cu, 0.4% MnS, 0.5% Mo, and the remainder iron powder by mass percentage. After mixing, place the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to be 90 min to obtain mixed powder.

[0200] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0201] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0202] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0203] C 0.7%, Cu 1.5%, Mn 0.25%, S 0.15%, Mo 0.5%, balance Fe.

[0204] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0205] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0206] Comparative Example 6

[0207] This comparative example prepares a wear-resistant alloy material. The process includes the following steps:

[0208] Powder mixing: First, weigh out 0.95% C, 1.0% Cu, 1.0% P, and the remainder as iron powder by mass percentage. After mixing, put the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to 90 minutes to obtain mixed powder.

[0209] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0210] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0211] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0212] C 0.95%, Cu 1.0%, P 0.25%, balance Fe.

[0213] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0214] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0215] Comparative Example 7

[0216] This comparative example prepares a wear-resistant alloy material. The process includes the following steps:

[0217] Powder mixing: First, weigh out 0.95% C, 0.6% MnS, 0.8% Mo, and the remainder iron powder by mass percentage. After mixing, put the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to 90 minutes to obtain mixed powder.

[0218] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0219] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0220] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0221] C 0.95%, Mn 0.38%, S 0.22%, Mo 0.8%, balance Fe.

[0222] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0223] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0224] Comparative Example 8

[0225] This comparative example prepares a wear-resistant alloy material. The process includes the following steps:

[0226] Powder mixing: First, weigh out 0.95% C, 1.0% Cu, and the remainder iron powder by mass percentage. After mixing, put the mixture into a ball mill for mixing and dispersion. Control the mixing and dispersion time to 90 minutes to obtain mixed powder.

[0227] Compression molding: The mixed powder is placed in a hydraulic press and molded at room temperature to obtain alloy ingredients;

[0228] Sintering: The alloy materials are sintered at 1130℃ for 50 minutes to obtain wear-resistant alloy materials.

[0229] The chemical composition of wear-resistant alloy materials, by mass percentage, is as follows:

[0230] C 0.95%, Cu 1.0%, balance Fe.

[0231] Frictional characteristics, such as the coefficient of friction and wear, were compared using a Falex ring block testing machine. The test sample was a standard ring block specimen, while the control ring block specimen was made of HT250 gray cast iron. The test conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the specimen block was evaluated using a microscope or a three-dimensional white light interferometer; this wear depth is the percentage of wear. It should be noted that the wear depth is expressed as a relative value for easier comparison; a smaller percentage value indicates better wear resistance.

[0232] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0233] The comparative sample of this invention uses HT250 gray cast iron, a material commonly used in the thrust section of existing compressors. The chemical composition of this material is: C 3.40%, Si 2.10%, Mn 0.67%, S 0.1%, P 0.1%, with the remainder being Fe. The density of this HT250 gray cast iron is 7.2 g / cm³. 3 Its hardness is 92 HRB.

[0234] The coefficient of friction and wear of HT250 gray cast iron were measured using a Falex ring block testing machine. The experimental conditions were oil lubrication. The coefficient of friction under steady-state conditions was recorded. After the experiment, the wear depth of the sample block was evaluated using a microscope or a three-dimensional white light interferometer, which is the wear amount. It should be noted that, for ease of comparison, the wear amount of this HT250 gray cast iron was used as the standard, and the wear amounts of other examples and comparative examples are relative values. The smaller the percentage value, the better the wear resistance of the material.

[0235] The performance parameters of the wear-resistant alloy materials are recorded in Table 1.

[0236] Table 1. Performance parameters of the alloys in various embodiments and comparative examples of the present invention.

[0237]

[0238]

[0239] For ease of comparison, the wear-resistant alloy materials in the embodiments of the present invention were formed using the same method. As shown in Table 1, the density of the wear-resistant alloy materials in the embodiments of the present invention is 6.6-6.9 g / cm³. 3 It has a hardness of 86-92 HRB, a porosity of 6.8-10.8%, and an average pore size of 21-28 μm. For example... Figure 2 and Figure 3 As shown, in metallographic analysis, the matrix before corrosion is a uniformly distributed porous structure, while the microstructure after corrosion is mainly composed of pearlite.

[0240] Regarding the etching before metallographic analysis, in practice, a 4% nitric acid alcohol solution can be dropped onto the polished metallographic sample, etched for 5-10 seconds, rinsed with tap water, and then dried again with dry compressed air before observation under a metallographic microscope.

[0241] The principle of metallographic corrosion is equivalent to electrochemical action. Different grains or structures have different physicochemical properties and therefore different free energies. In the etching solution, these result in different electrode potentials, forming micro-cells in the microscopic region. The lower potential areas are not the anodes of these micro-cells and dissolve more quickly. The dissolved areas appear as depressions or deposited reaction products, resulting in discoloration. Therefore, this invention uses a 4% nitric acid alcohol etching agent, and after etching for a certain period, the deposited material is washed off with tap water.

[0242] As can be seen from the relative wear amounts in Table 1, the relative wear amounts of Examples 1-7 are generally lower than those of Comparative Examples 1-8, indicating that the wear-resistant alloy material of the present invention has relatively high wear resistance and friction reduction properties. Meanwhile, since Comparative Examples 3, 6, and 8 did not use MnS and Mo, the data in Table 1 shows that the friction coefficients and relative wear amounts of Comparative Examples 3, 6, and 8 are significantly higher. Therefore, it can be concluded that the wear-resistant alloy materials in Comparative Examples 3, 6, and 8, due to the absence of MnS and Mo, have significantly lower wear resistance and friction reduction properties than the wear-resistant alloy materials of the present invention that use MnS and Mo.

[0243] Furthermore, carbon content plays a crucial role in the alloy; however, once the carbon content reaches a high value, the frictional properties do not continuously improve. In other words, there is an optimal carbon mass fraction in the alloy material. Since Cu is an alloying element that can improve the overall performance of the alloy, the preferred Cu ratio in this invention is 1.0-2.0%. Similarly, the preferred ratios of MnS and Mo in this scheme are 0.4-0.6%, and ferrophosphorus powder is 1.0-2.0%. For higher alloying element ratios, it is difficult to achieve optimal alloy material performance. It should be noted that while adding a single alloying element to this invention may achieve the same tribological properties, it may sacrifice cost-effectiveness. This invention, through the selection of the proportions of each component, produces a wear-resistant alloy material with superior performance.

[0244] The integrally formed bearing part 530 and fixing part 520 have annular mounting grooves on the surface corresponding to the crankshaft 200. The wear-resistant alloy material prepared in the above embodiment is processed into annular thrust part 510 according to formula (1) and formula (2) and the structural design of the interference fit of thrust part 510 is 0.010-0.050mm. The thrust part 510 is installed in the annular mounting groove by interference fit. The resulting lower flange thrust structure is installed on the rotor compressor.

[0245] Using a C49 series, 6HP variable frequency rolling rotor compressor as a comparative object, and employing the wear-resistant material of Embodiment 4 of this invention as the thrust section, a C49 series, 6HP variable frequency rolling rotor compressor was used as the experimental object. Both the comparative and experimental objects were subjected to long-term reliability tests under high speed (130Hz) and high pressure conditions. After the experiment, the wear amount was evaluated using the surface profile method. The wear amount at the maximum wear point of the thrust section of the two rotor compressors was compared. The wear amount of the rotor compressor used as the comparative object reached 3.7 micrometers, while the wear amount of the rotor compressor used as the experimental object was only 0.8 micrometers. It can be concluded that the rotor compressor using the wear-resistant material of this invention as the thrust section exhibits a significant improvement in the wear degree of its thrust section.

[0246] The wear-resistant alloy material of this invention possesses excellent wear resistance and friction reduction properties. It is primarily composed of iron and carbon, with the addition of Cu to refine the pearlite structure. The addition of MnS and Mo alloys during high-temperature sintering promotes changes in the metallographic structure, forming a certain amount of MnFe and Mo2S, thus improving the friction reduction and processing properties of the wear-resistant alloy material. Furthermore, the appropriate addition of ferrophosphorus powder further enhances the wear resistance. This wear-resistant alloy material requires no subsequent heat treatment during use, and its simple manufacturing process achieves excellent performance. Since thrust wear is a significant failure mode of compressors, the thrust structure of this wear-resistant alloy material can improve the pump body life of the compressor, thereby extending the service life of the air conditioning unit.

[0247] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a wear-resistant alloy material, characterized in that: The preparation method includes the following steps: Step 1): Weigh out each raw material according to the mass percentage of 0.3-0.95wt%C, 0-2.5wt%Cu, 0-0.6wt%MnS, 0-0.8wt%Mo, 0-2.0wt%Fe, and mix and disperse the raw materials to obtain a mixed powder. Step 2): The mixed powder is molded to obtain alloy ingredients; Step 3): The alloy ingredients are sintered to obtain wear-resistant alloy material; wherein the alloy ingredients are sintered at a temperature of 1100-1250℃ and the sintering time is controlled to be 40-60min. The wear-resistant alloy material comprises the following chemical components by weight percentage: C 0.3-0.95wt%, Cu 1.0-2.5wt%, Mn 0.25-0.38wt%, S 0.15-0.22wt%, Mo 0.3-0.8wt%, P 0.13-0.52wt%, balance Fe; The wear-resistant alloy material has a uniformly distributed porous structure; the wear-resistant alloy material has a uniform lamellar pearlite structure; the porosity of the wear-resistant alloy material is 5.4-10.8%; the pore size of the wear-resistant alloy material is not greater than 200μm; the wear-resistant alloy material contains MnFe and Mo2S to improve wear reduction.

2. The method for preparing a wear-resistant alloy material according to claim 1, characterized in that: The wear-resistant alloy material has a hardness of 70-110 HRB.

3. The method for preparing a wear-resistant alloy material according to claim 1, characterized in that: The density of the wear-resistant alloy material is 6.6-7.0 g / cm³. 3 .

4. The method for preparing a wear-resistant alloy material according to claim 1, characterized in that: In step 1), the phosphorus iron powder comprises the following chemical composition by mass percentage: P 24-26%, C 0.85-1.15%, with the balance being Fe.

5. The method for preparing a wear-resistant alloy material according to claim 1, characterized in that: In step 1), the weighed raw materials are placed into a ball mill for mixing and dispersion, and the mixing and dispersion time is controlled to be 60-120 min.

6. A thrust member for a compressor, characterized in that: The compressor thrust section is made of a wear-resistant alloy material obtained by the preparation method described in any one of claims 1-5.

7. A compressor lower flange structure, characterized in that: The compressor lower flange structure is provided with a lower flange thrust portion (510) for interacting with the crankshaft (200), wherein the lower flange thrust portion (510) is made of wear-resistant alloy material obtained by the preparation method according to any one of claims 1-5.

8. A compressor lower flange structure according to claim 7, characterized in that: The compressor lower flange structure includes a flange and a lower flange thrust portion (510); wherein, an installation groove is provided at the upper end of the flange; the lower flange thrust portion (510) is installed in the installation groove; and the lower flange thrust portion (510) has an inner hole, and correspondingly, both the installation groove and the flange have through holes communicating with the inner hole so that the crankshaft (200) can pass through.

9. A compressor lower flange structure according to claim 8, characterized in that: The lower flange thrust portion (510) is provided in the mounting groove with an interference fit.

10. A compressor lower flange structure according to claim 9, characterized in that: The interference fit between the lower flange thrust portion (510) and the mounting groove is 0.010-0.050 mm.

11. A compressor lower flange structure according to claim 8, characterized in that: The thrust portion (510) of the lower flange has an annular structure.

12. A compressor lower flange structure according to any one of claims 7-11, characterized in that: The structural design of the lower flange thrust part (510) satisfies the following formula (1); （1）； And / or, the structural design of the lower flange thrust portion (510) satisfies the following formula (2): （2）； Where D1 is the inner diameter of the thrust section of the lower flange, D2 is the outer diameter of the thrust section of the lower flange, H1 is the height of the thrust section of the lower flange, D is the inner diameter of the cylinder, and r is the maximum radius of the thrust section of the crankshaft.

Images