Air conditioner compressor cylinder body surface blackening process

Abstract

The invention relates to the technical field of air conditioner compressor cylinder body blackening treatment, in particular to an air conditioner compressor cylinder body surface blackening process which comprises the steps of a, pre-degreasing, b, chemical degreasing, c, primary washing, d, pickling activation, e, secondary washing, f, alkaline blackening, g, tertiary washing, h, oil immersion sealing and i, air drying. On the basis of an existing blackening process, a specific material frame module is developed, when the material frame module is used for loading a cylinder body, in the blackening process of the cylinder body, the material frame module can enable soaking liquid to smoothly flow in a material frame, meanwhile, when a sealing agent is removed, air flow and heat can smoothly flow in the material frame, and therefore the blackening effect of the cylinder body is improved. And the blackening soaking uniformity of the cylinder body and the removal efficiency of the sealing agent are improved.

Description

Technical Field

[0001] This invention relates to the field of blackening treatment technology for air conditioner compressor cylinders, and particularly to a blackening process for the surface of an air conditioner compressor cylinder. Background Technology

[0002] The air conditioner compressor cylinder is manufactured by powder metallurgy pressing. The formed cylinder needs to be blackened afterward. The core of blackening powder metallurgy pressed parts is to form a uniform, dense, and strongly bonded oxide film on its porous surface. Its main functions are rust prevention, wear resistance, and decoration, while also ensuring dimensional accuracy and preventing pore blockage.

[0003] In existing methods of blackening the cylinder, the cylinder is laid flat on a material frame, and then the material frame is placed into a solvent degreasing tank, an alkaline degreasing tank, a water washing tank, an acid washing tank, a blackening tank, and an oil immersion tank. This allows the cylinder, which is supported in the material frame, to be immersed in the corresponding immersion solution to complete the blackening process.

[0004] However, when existing material frames are soaked in various reaction tanks with soaking solution, the flow of the soaking solution in the material frames is significantly disturbed due to the tight arrangement of the cylinders inside the material frames and the stacking of multiple material frames. This is especially true during oil immersion sealing, where vacuum impregnation is sometimes necessary. Therefore, ensuring the stability of the flow of the soaking solution in the material frames is the key to ensuring the stable blackening of the cylinders.

[0005] In addition, especially after oil immersion sealing, in order to remove excess sealant from the cylinder surface, it is necessary to drain, dry or air dry after oil immersion sealing. However, the existing material frame supporting the cylinder will cause airflow and heat to not be able to enter the material frame smoothly when removing sealant, which will greatly slow down the sealant removal efficiency. Therefore, there is an urgent need for a cylinder surface blackening process that can solve the above problems. Summary of the Invention

[0006] To address the above problems, this invention provides a blackening process for the surface of an air conditioning compressor cylinder. Based on existing blackening processes, a specific material frame module is developed. When the cylinder is loaded using the material frame module, the soaking liquid can flow smoothly within the material frame during the blackening process. Simultaneously, during sealant removal, airflow and heat can flow smoothly within the material frame, thereby improving the uniformity of blackening and soaking of the cylinder and the efficiency of sealant removal.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A blackening process for the surface of an air conditioner compressor cylinder includes the following steps: Step a: Pre-degreasing. Use gasoline and trichloroethylene as solvents to soak the sintered cylinder for 10-15 minutes, then bake at 120-150℃ for 20-30 minutes to evaporate the oil stains in the pores. Step b: Chemical degreasing. Sodium hydroxide, sodium carbonate, trisodium phosphate, and surfactants are used as the alkaline degreasing solution. The tank is immersed at 60-80℃ for 15-25 minutes to remove residual saponified oil and impurities from the surface. Step c: Rinse the tank twice with running water for 3-5 minutes each time to remove the degreasing solution. Step d: Pickling and activation. Use 5%-10% dilute hydrochloric acid or 8%-12% sulfuric acid to immerse the tank at room temperature for 1-3 minutes to remove oxide scale and rust from the tank surface and activate the surface. Step e: Secondary water wash, using running clean water to thoroughly rinse the tank to eliminate acid residue; Step f, alkaline blackening, using 600-700g / L sodium hydroxide, 100-150g / L sodium nitrite, 20-30g / L sodium nitrate and blackening accelerator as blackening agents, and immersing the tank in the blackening treatment at a temperature of 138-142℃ for 20-40 minutes. Step g: Wash three times with flowing overflow hot water at 60-80℃, soak the tank for 1-3 minutes, then rinse the tank with flowing clean water until the pH of the tank surface is neutral. Step h, oil immersion and sealing: First, dry the cylinder at 80-100℃ for 30 minutes to remove moisture from the pores, then immerse it in dehydrating rust-preventive oil, paraffin oil, and organosilicon sealant at 60-80℃ for 20-30 minutes. Step i: Air dry at room temperature to remove excess sealant from the cylinder surface and obtain the finished product.

[0008] As an improvement, in steps a, b, d, f and h, the cylinder body is loaded in layers using a material frame module. The material frame module includes a spindle piston assembly at the central shaft and a material frame assembly sleeved on the spindle piston assembly. Several sets of material frame assemblies are stacked. During the immersion of the cylinder, the mandrel piston assembly operates, agitating the immersion liquid to flow within the material frame assembly of each layer, and the split material carrier plates at the bottom of each group of material frame assemblies are arranged in a staggered or inclined manner.

[0009] As an improvement, in step i, the cylinder body is loaded in layers using a material frame module. The material frame module includes an air guide pipe assembly at the central axis and a material frame assembly sleeved on the air guide pipe assembly. Several sets of material frame assemblies are stacked. During air cooling, the air duct assembly directs the airflow blown by the bottom fan to the center of the material frame assembly on each layer, and the split material carrier plates at the bottom of each group of material frame assemblies are arranged in a staggered manner or at an angle.

[0010] As an improvement, both the spindle piston assembly and the air duct assembly include a bottom bracket, a mounting bracket, an air duct, and a top end cap; The bottom support is suspended in the air, and the vertical guide pipe is installed at the center of the bottom support; The mounting bracket is fixedly installed on the bottom support, and the mounting bracket is connected to the guide pipe; The bottom of the guide tube is open, and several guide holes are provided on the side wall of the guide tube. The top end cap is installed on the top of the guide tube.

[0011] As an improvement, the mandrel piston assembly also includes a mounting block and a piston; The mounting block is installed in the middle of the guide tube, and the mounting block is connected to the top end cap by a connecting rod; The piston is mounted on the top end cap and the mounting block via a U-shaped guide rod. The piston is designed to move up and down. A limit block is installed on the U-shaped guide rod, and the limit block is located above the mounting block.

[0012] As an improvement, the material frame assembly further includes a material frame, which includes an inner ring and an outer ring arranged concentrically. The material carrier plate is arranged in a fan shape, and several groups of the material carrier plates are arranged equidistantly around the circumference of the inner ring. The material carrier plates are all rotatably connected to the inner ring through mounting columns. The inner ring, outer ring, and carrier plate are all provided with a number of through holes, through which the soaking liquid and gas can pass.

[0013] As an improvement, the material carrier plate is evenly distributed with a number of positioning rings, which are fitted into the cylinder body to position the cylinder body.

[0014] As an improvement, a top plate is provided between adjacent material frame assemblies. A number of protrusions are provided at equal intervals on the circumference of the top plate and the mounting frame. Each protrusion corresponds to a material carrier plate and lifts up the outer edge of the material carrier plate.

[0015] As an improvement, when the material carrier plates are arranged in a staggered manner, the height of the protrusions gradually decreases along the circumferential direction of the top plate or the mounting bracket, and the material carrier plates and the mounting columns are connected by a rotating shaft.

[0016] As an improvement, when the material carrier plates are arranged at an angle, the top of the protrusion is sloped, and the material carrier plates and the mounting column are connected by a ball joint rotational fit.

[0017] The beneficial effects of this invention are as follows: (1) Based on the existing blackening process, this invention develops a specific material frame module. When the cylinder is loaded using the material frame module, the material frame module allows the soaking liquid to flow smoothly in the material frame during the blackening process. At the same time, when removing the sealant, the airflow and heat can flow smoothly in the material frame, thereby improving the uniformity of blackening and soaking of the cylinder and the efficiency of sealant removal. (2) When the cylinder is immersed, the present invention uses the mandrel piston assembly set at the center of the material frame module to agitate the immersion liquid, so that the immersion liquid can be agitated from the center of the material frame assembly to the entire material frame, thereby promoting the flow of the immersion liquid in the material frame assembly, so that the cylinder can fully contact the immersion liquid, and the immersion of the cylinder is more thorough. (3) By improving the material plate of the material frame assembly, the split material plate at the bottom of the material frame assembly is arranged in a staggered manner or at an incline during soaking and air drying, so that the upper and lower material frame assemblies can flow together, thereby allowing the soaking liquid to flow between the upper and lower layers. Especially when the sealant is removed by air drying, the airflow at the bottom can flow from bottom to top through the connected upper and lower material frame assemblies, thereby improving the efficiency of sealant removal by air drying. (4) By setting the material plate in an inclined state, the cylinder is tilted, so that when the soaking liquid flows, the soaking liquid can fully contact the inclined cylinder. At the same time, when air drying, the inclined cylinder has a larger contact surface with the airflow compared to the horizontally placed cylinder, and the upper surface of the cylinder can also fully contact the airflow, so that the drying speed of the cylinder is faster.

[0018] In summary, this invention has the advantages of thorough and uniform soaking during the blackening process, and fast and stable removal of the sealant, making it particularly suitable for the blackening processing technology of air conditioning compressor cylinders. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the blackening process of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the cylinder block of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the material frame module of the present invention; Figure 4 This is a three-dimensional structural diagram of the mandrel piston assembly of the present invention; Figure 5This is a schematic diagram of the three-dimensional structure of the bottom support of the present invention; Figure 6 This is a three-dimensional structural diagram of the mounting bracket of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the top plate of the present invention. Figure 1 ; Figure 8 This is a schematic diagram of the piston's three-dimensional structure according to the present invention; Figure 9 This is a schematic cross-sectional view of the flow guide tube of the present invention; Figure 10 This is a three-dimensional structural diagram of the top end cap of the present invention; Figure 11 This is a schematic diagram of the mating structure of the material frame assembly and the mandrel piston assembly of the present invention; Figure 12 This is a three-dimensional structural diagram of the material frame assembly of the present invention; Figure 13 for Figure 12 Enlarged schematic diagram of the structure at point A in the middle; Figure 14 for Figure 12 Enlarged schematic diagram of the structure at point B; Figure 15 This is a schematic diagram of the drying state of the material frame module of the present invention; Figure 16 This is a schematic diagram of the assembly of the material frame component and the top plate of the present invention; Figure 17 This is a schematic diagram showing the staggered arrangement of the material carrier plates in the material frame assembly of the present invention. Figure 18 This is a schematic diagram of the tilted state of the material frame assembly of the present invention; Figure 19 for Figure 18 Enlarged schematic diagram of the structure at point C; Figure 20 This is a schematic diagram of the three-dimensional structure of the top plate of the present invention. Figure 2 .

[0020] Numbering on the map: Material frame module 1, cylinder body 100, spindle piston assembly 1, bottom bracket 11, mounting bracket 12, threaded connection hole 120, guide pipe 13, guide hole 131, top end cap 14, mounting block 15, connecting rod 151, piston 16, U-shaped guide rod 17, limit block 18, material frame assembly 2, through hole 200, material carrier plate 21, positioning ring 211, rotating shaft 213, mounting column 210, material frame 22, frame 220, inner ring 221, outer ring 222, top plate 23, protrusion 231, ball head 214, air duct assembly 3, bottom fan 4. Detailed Implementation

[0021] 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. 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.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] Example 1: like Figures 1-3 , Figure 15 As shown, a blackening process for the surface of an air conditioner compressor cylinder includes the following steps: Step a: Pre-degreasing. Use gasoline and trichloroethylene as solvents to soak the sintered cylinder for 10-15 minutes, then bake at 120-150℃ for 20-30 minutes to evaporate the oil in the pores and remove the stretching oil, cutting fluid and dust remaining from pressing, sintering and machining. Step b: Chemical degreasing. Sodium hydroxide, sodium carbonate, trisodium phosphate, and surfactants are used as the alkaline degreasing solution. The tank is immersed at 60-80℃ for 15-25 minutes to remove residual saponified oil and impurities from the surface. Step c: Rinse the tank twice with running water for 3-5 minutes each time to remove the degreasing solution and prevent it from being carried into the blackening tank. Step d: Pickling and activation. Use 5%-10% dilute hydrochloric acid or 8%-12% sulfuric acid. Immerse the tank at room temperature for 1-3 minutes to remove oxide scale and rust from the tank surface and activate the surface. Strictly control the time to prevent over-corrosion from causing pore expansion and weight loss of the parts. Step e: Secondary water wash. Use running clean water to thoroughly rinse the tank to eliminate acid residue and prevent the blackening solution from failing and the film from becoming discolored. Step f: Alkaline blackening. Using 600-700 g / L sodium hydroxide, 100-150 g / L sodium nitrite, 20-30 g / L sodium nitrate, and a blackening accelerator as the blackening agent, the tank is immersed in the blackening treatment at 138-142℃ for 20-40 minutes. The reaction principle is: 3Fe + 4H₂O Fe3O4 + 4H2, while sodium nitrite acts as an oxidant to accelerate the formation of a dense oxide film; Step g: Wash three times with flowing overflow hot water at 60-80℃, soak the tank for 1-3 minutes, then rinse the tank with flowing clean water until the pH of the tank surface is neutral. Step h, oil immersion and sealing: First, dry the cylinder at 80-100℃ for 30 minutes to remove moisture from the pores, then immerse it in dehydrating rust-preventive oil, paraffin oil, and organosilicon sealant at 60-80℃ for 20-30 minutes. Step i: Air dry at room temperature to remove excess sealant from the cylinder surface and obtain the finished product.

[0025] In steps a, b, d, f and h, the cylinder body 100 is loaded in layers using a material frame module I. The material frame module I includes a spindle piston assembly 1 at the central shaft and a material frame assembly 2 sleeved on the spindle piston assembly 1. Several sets of material frame assemblies 2 are stacked. During the immersion process, the mandrel piston assembly 1 operates, agitating the immersion liquid to flow within each layer of the material frame assembly 2. The split-type material carrier plates 21 at the bottom of each set of material frame assemblies 2 are arranged in a staggered or inclined manner, allowing the immersion liquid to flow between the upper and lower material frame assemblies 2, and enabling the flowing immersion liquid to come into full contact with the cylinder more quickly.

[0026] In addition, in step i, the cylinder body 100 is loaded in layers using a material frame module I. The material frame module I includes an air guide pipe assembly 3 at the central axis and a material frame assembly 2 sleeved on the air guide pipe assembly 3. Several sets of material frame assemblies 2 are stacked. During air cooling, the air duct assembly 3 guides the airflow blown by the bottom fan 4 to the center of each layer of the material frame assembly 2. The split-type material carrier plates 21 at the bottom of each group of material frame assemblies 2 are arranged in a staggered or inclined manner. The bottom blower 4 blows the gas upwards, causing it to flow upwards through the material frame assembly 2, thus carrying away the sealant on the cylinder surface. It is worth noting that because the cylinder is laid flat on each layer of the material frame assembly 2, the gas below is trapped by the cylinder as it flows upwards through the material frame assembly 2. Due to the obstruction of the material body, it is difficult for the gas to pass smoothly upward through the material frame assembly 2. Therefore, the present invention sets the material carrier plate 21 at the bottom of the material frame assembly 2 separately, so that a gap can be formed between the material carrier plates 21, thereby allowing the airflow at the bottom to pass smoothly upward through the material frame assembly 2 in sequence, thereby quickly removing and eliminating the sealant on the cylinder. Furthermore, when the material carrier plates 21 are set at different heights or in an alternating tilt, the cylinder will also be set in an tilted state, so that when the gas passes through the cylinder, it can more smoothly and thoroughly remove the sealant on the surface of the cylinder.

[0027] Example 2: Referring to Example 1, the difference between Example 2 and Example 1 lies in the following: like Figures 2-11 As shown, both the spindle piston assembly 1 and the air duct assembly 3 include a bottom bracket 11, a mounting bracket 12, an air duct 13, and a top end cap 14; The bottom support 11 is suspended to facilitate the entry of the soaking liquid, and the vertical guide pipe 13 is installed at the center of the bottom support 11. The mounting bracket 12 is fixedly mounted on the bottom bracket 11 by threaded fasteners. A threaded connection hole 120 is provided at the center of the mounting bracket 12. The mounting bracket 12 is connected to the guide pipe 13 through the threaded connection hole 120, thereby making the bottom bracket 11, the mounting bracket 12 and the guide pipe 13 connected as one unit. The bottom opening of the guide pipe 13 allows the soaking liquid and airflow to enter the guide pipe 13 through the bottom opening. The side wall of the guide pipe 13 is provided with a plurality of guide holes 131 for discharging the soaking liquid or airflow from the guide holes 131, so that the flow of soaking liquid and airflow can be formed at the center of the material frame assembly 2. The top end cap 14 is installed on the top of the guide pipe 13. The top end cap 14 is used to close the top of the guide pipe 13. In particular, during the air drying step, it can prevent the airflow from being discharged from the top of the guide pipe 13, so that the airflow is discharged only from the guide hole 131. In conjunction with the bottom fan, an air drying airflow system with alternating upward and horizontal airflow is formed on each layer of the material frame assembly 2, thereby allowing the cylinder to be fully dried in the bidirectional air drying airflow system.

[0028] Furthermore, the spindle piston assembly 1 also includes a mounting block 15 and a piston 16; The mounting block 15 is installed in the middle of the guide pipe 13, and the mounting block 15 is connected to the top end cap 14 by a connecting rod 151. The piston 16 is mounted on the top end cap 14 and the mounting block 15 via a U-shaped guide rod 17. The piston 16 is movable up and down. A limit block 18 is installed on the U-shaped guide rod 17, and the limit block 18 is located above the mounting block 15.

[0029] It should be noted that, unlike the air duct assembly 3, in the mandrel piston assembly 1, a piston 16 is installed inside the air duct 13 to agitate the flow of the soaking liquid. The piston 16 is mounted on the top end cap 14 via a U-shaped guide rod 17. To ensure the stability of the piston 16's vertical movement, a mounting block 15 is also provided. The mounting block 15 and the top end cap 14 are connected as one unit by a connecting rod 151. The U-shaped guide rod 17 passes through the top end cap 14 and the mounting block 15 respectively, connecting to the piston 16. Threads are provided at the top and middle of the air duct 13, and correspondingly, threads are also provided on the top end cap 14 and the mounting block 15. The top end cap 14, mounting block 15, and guide tube 13 are connected by threads. A limit block 18 is set on the upper part of the U-shaped guide rod 17. After the corresponding groove is installed on the material frame module I, the top of the U-shaped guide rod 17 is exposed outside the soaking liquid after the soaking liquid has submerged the material frame module I. After being connected to the U-shaped guide rod 17 by a pneumatic push-pull mechanism, the piston 16 is driven to move in the guide tube 13 through the U-shaped guide rod 17 via the pneumatic push-pull mechanism, thereby agitating the soaking liquid inside the guide tube 13 to flow and discharge it outward through the guide hole 131, driving the soaking liquid to flow in each layer of the material frame assembly 2, so that the soaking liquid can fully contact the cylinder.

[0030] To further explain, after the material frame module I has completed the soaking and drying process, it is only necessary to rotate the top end cap 14 to remove the piston 16 from the guide tube 13, replace it with a single top end cap 14, and seal the top opening of the guide tube 13. This will allow the mandrel piston assembly 1 to be switched to the air guide tube assembly 3.

[0031] Example 3: Referring to Example 1, the difference between Example 3 and Example 1 lies in the following: like Figures 12-16As shown, the material frame assembly 2 also includes a material frame 22, which includes an inner ring 221 and an outer ring 222 arranged concentrically. A fan-shaped frame 220 is provided between the inner ring 221 and the outer ring 222 for placing the material carrier plate 21. When the material frame assembly 2 is mounted on the spindle piston assembly 1 or the air guide pipe assembly 3, the inner ring 221 is coaxially sleeved with the air guide pipe 13. The material carrier plate 21 is arranged in a fan shape, and several groups of the material carrier plates 21 are arranged equidistantly around the circumference of the inner ring 221. The material carrier plates 21 are all rotatably connected to the inner ring 221 through the mounting column 210. The inner ring 221, outer ring 222 and material carrier plate 21 are all provided with a number of through holes 200, which allow the soaking liquid and gas to pass through.

[0032] Furthermore, a plurality of positioning rings 211 are evenly distributed on the material carrier plate 21. The positioning rings 211 are fitted with the cylinder body 100 to position the cylinder body 100.

[0033] Furthermore, a top plate 23 is provided between adjacent material frame assemblies 2. A plurality of protrusions 231 are provided at equal intervals on the circumference of the top plate 23 and the mounting frame 12. The protrusions 231 are provided one-to-one with the material carrier plate 21, and the protrusions 231 lift up the outer edge of the material carrier plate 21.

[0034] The lower edge of the top plate 23 has a protruding ring 230 that fits into the outer ring 222, thereby fixing the top plate 23.

[0035] It should be noted that, unlike existing material frames, the material carrier plate 21 of the material frame assembly 2 of the present invention is not fixed but movable. Initially, the material carrier plate 21 at the bottom of the material frame assembly 2 is in a horizontal state. At this time, the cylinders are installed onto the material carrier plate 21 one by one. After the material carrier plate 21 is filled, when the material frame assembly 2 is installed onto the mandrel piston assembly 1 or the air guide pipe assembly 3, the protrusion 231 will lift the material carrier plate 21 through the cooperation of the protrusion 231 with the corresponding material carrier plate 21, so that the material carrier plate 21 is in an inclined state. The inclination of the material carrier plate 21 will drive the cylinder to be in an inclined state, and a gap will also be formed between the material carrier plates 21 to facilitate the entry and flow of soaking liquid and gas.

[0036] Furthermore, a positioning ring 211 is provided on the material carrier plate 21. When the cylinder body is mounted, the cylinder body will be directly fitted onto the positioning ring 211. Through the positioning of the positioning ring 211, the cylinder body will not move when the material carrier plate 21 is tilted.

[0037] Example 4: Referring to Example 1, the difference between Example 4 and Example 1 lies in the following: like Figure 17As shown, when the material carrier plate 21 is arranged in a staggered manner, the height of the protrusion 231 gradually decreases along the circumferential direction of the top plate 23 or the mounting bracket 12, and the material carrier plate 21 and the mounting column 210 are rotatably connected by a rotating shaft 213.

[0038] It should be noted that the material carrier plates 21 are arranged in a staggered manner, which makes the gaps between the material carrier plates 21 more stable. Furthermore, by gradually reducing the height of the protrusions 231, the size of the gaps can be gradually reduced, forming a stepped staggered state. This allows the airflow to be guided on the material carrier plates 21, enabling the airflow to pass smoothly through the gaps and circulate within each layer of the material frame assembly 2.

[0039] To further explain, when the protrusion 231 abuts against the outer edge of the carrier plate 21, the outer edge of the carrier plate 21 is lifted upward, and the inner edge of the carrier plate 21 and the mounting post 210 rotate and swing through the pivot, thereby causing the carrier plate 21 to be in an inclined state.

[0040] Example 5: Referring to Example 4, the difference between Example 5 and Example 4 lies in: like Figures 18-20 As shown, when the material carrier plate 21 is arranged at an angle, the top of the protrusion 231 is sloped, and the material carrier plate 21 and the mounting post 210 are connected by a ball head 214 through a rotatable engagement.

[0041] It should be noted that, compared to Embodiment 4, the material carrier plate 21 in Embodiment 5 is arranged in an inclined fan-blade shape. When the material carrier plate 21 abuts against the protrusion 231, the top slope of the protrusion 231 abuts against the lower end of the material carrier plate 21. The ball head 214 of the material carrier plate 21 and the mounting post 210 will rotate, thereby causing the material carrier plate 21 to tilt in a fan-blade-like inclined state. The fan-blade-like inclination between the material carrier plates 21 will allow the airflow to obtain better airflow guidance than in Embodiment 4 when passing through the material carrier plate 21, thereby allowing the gas to flow more smoothly between the material frame assembly 2 during air drying.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A blackening process for the surface of an air conditioner compressor cylinder, characterized in that, Includes the following steps: Step a: Pre-degreasing. Use gasoline and trichloroethylene as solvents to soak the sintered cylinder for 10-15 minutes, then bake at 120-150℃ for 20-30 minutes to evaporate the oil stains in the pores. Step b: Chemical degreasing. Sodium hydroxide, sodium carbonate, trisodium phosphate, and surfactants are used as the alkaline degreasing solution. The tank is immersed at 60-80℃ for 15-25 minutes to remove residual saponified oil and impurities from the surface. Step c: Rinse the tank twice with running water for 3-5 minutes each time to remove the degreasing solution. Step d: Pickling and activation. Use 5%-10% dilute hydrochloric acid or 8%-12% sulfuric acid to immerse the tank at room temperature for 1-3 minutes to remove oxide scale and rust from the tank surface and activate the surface. Step e: Secondary water wash, using running clean water to thoroughly rinse the tank to eliminate acid residue; Step f, alkaline blackening, using 600-700g / L sodium hydroxide, 100-150g / L sodium nitrite, 20-30g / L sodium nitrate and blackening accelerator as blackening agents, and immersing the tank in the blackening treatment at a temperature of 138-142℃ for 20-40 minutes. Step g: Wash three times with flowing overflow hot water at 60-80℃, soak the tank for 1-3 minutes, then rinse the tank with flowing clean water until the pH of the tank surface is neutral. Step h, oil immersion and sealing: First, dry the cylinder at 80-100℃ for 30 minutes to remove moisture from the pores, then immerse it in dehydrating rust-preventive oil, paraffin oil, and organosilicon sealant at 60-80℃ for 20-30 minutes. Step i: Air dry at room temperature to remove excess sealant from the cylinder surface and obtain the finished product.

2. The blackening process for the cylinder surface of an air conditioning compressor according to claim 1, characterized in that: In steps a, b, d, f and h, the cylinder body (100) is loaded in layers using a material frame module (I). The material frame module (I) includes a spindle piston assembly (1) at the central shaft and a material frame assembly (2) sleeved on the spindle piston assembly (1). Several sets of material frame assemblies (2) are stacked. When the cylinder is soaked, the mandrel piston assembly (1) operates, agitating the soaking liquid to flow in the material frame assembly (2) of each layer, and the split material plates (21) at the bottom of each set of material frame assembly (2) are arranged in a staggered manner or at an angle.

3. The blackening process for the cylinder surface of an air conditioning compressor according to claim 2, characterized in that: In step i, the cylinder body (100) is loaded in layers using a material frame module (I). The material frame module (I) includes an air guide pipe assembly (3) at the central axis and a material frame assembly (2) sleeved on the air guide pipe assembly (3). Several sets of material frame assemblies (2) are stacked. When air-cooled, the air duct assembly (3) guides the airflow blown by the bottom fan (4) to the center of the material frame assembly (2) of each layer, and the split material plates (21) at the bottom of each set of material frame assemblies (2) are arranged in a staggered manner or in an inclined manner.

4. The blackening process for the cylinder surface of an air conditioning compressor according to claim 3, characterized in that: Both the spindle piston assembly (1) and the air duct assembly (3) include a bottom bracket (11), a mounting bracket (12), a guide tube (13), and a top end cap (14). The bottom support (11) is suspended, and the vertical guide pipe (13) is installed at the center of the bottom support (11). The mounting bracket (12) is fixedly installed on the bottom support (11), and the mounting bracket (12) is connected to the guide pipe (13); The bottom of the guide tube (13) is open, and a plurality of guide holes (131) are provided on the side wall of the guide tube (13). The top end cap (14) is installed on the top of the guide tube (13).

5. The blackening process for the cylinder surface of an air conditioning compressor according to claim 4, characterized in that: The spindle piston assembly (1) also includes a mounting block (15) and a piston (16). The mounting block (15) is installed in the middle of the guide pipe (13), and the mounting block (15) is connected to the top end cap (14) by a connecting rod (151); The piston (16) is mounted on the top end cap (14) and the mounting block (15) via a U-shaped guide rod (17). The piston (16) is movable up and down. A limit block (18) is installed on the U-shaped guide rod (17), and the limit block (18) is located above the mounting block (15).

6. The blackening process for the cylinder surface of an air conditioning compressor according to claim 4, characterized in that: The material frame assembly (2) also includes a material frame (22), which includes an inner ring (221) and an outer ring (222) arranged concentrically. The material carrier plate (21) is arranged in a fan shape, and several groups of the material carrier plates (21) are arranged equidistantly around the circumference of the inner ring (221). The material carrier plates (21) are all rotatably connected to the inner ring (221) through mounting columns (210). The inner ring (221), outer ring (222) and carrier plate (21) are each provided with a number of through holes (200) through which the soaking liquid and gas are allowed to pass.

7. The blackening process for the cylinder surface of an air conditioning compressor according to claim 6, characterized in that: The material carrier plate (21) is evenly distributed with a number of positioning rings (211), which are fitted with the cylinder body (100) to position the cylinder body (100).

8. The blackening process for the cylinder surface of an air conditioning compressor according to claim 6, characterized in that: A top plate (23) is provided between adjacent material frame assemblies (2). A number of protrusions (231) are provided at equal intervals on the circumference of the top plate (23) and the mounting frame (12). The protrusions (231) are provided one-to-one with the material carrier plate (21), and the protrusions (231) lift up the outer edge of the material carrier plate (21).

9. The blackening process for the cylinder surface of an air conditioning compressor according to claim 8, characterized in that: When the material carrier plate (21) is arranged in a staggered manner, the height of the protrusion (231) gradually decreases along the circumferential direction of the top plate (23) or the mounting bracket (12), and the material carrier plate (21) and the mounting column (210) are connected by a rotating shaft (213).

10. The blackening process for the cylinder surface of an air conditioning compressor according to claim 8, characterized in that: When the material carrier plate (21) is arranged at an angle, the top of the protrusion (231) is sloped, and the material carrier plate (21) and the mounting column (210) are connected by a ball head (214) through a rotating fit.

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