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CN-121992384-A - Blackening process for surface of air conditioner compressor cylinder body

CN121992384ACN 121992384 ACN121992384 ACN 121992384ACN-121992384-A

Abstract

The present invention relates to the field of blackening treatment technology for the cylinder body of an air conditioning compressor, and particularly relates to a blackening process for the surface of the cylinder body of an air conditioning compressor, comprising steps a, pre degreasing, b, chemical degreasing, c, first water washing, d, acid washing activation, e, second water washing, f, alkaline blackening, g, third water washing, h, oil immersion sealing, i, air drying. Based on the existing blackening process, a specific material frame module is developed. When loading the cylinder body with the material frame module, the material frame module can allow the soaking solution to flow smoothly in the material frame during the blackening process. At the same time, when removing the sealing agent, it can also make the airflow and heat flow smoothly in the material frame. Flow within the material frame improves the uniformity of blackening and soaking of the cylinder body, as well as the efficiency of removing the sealing agent.

Inventors

  • CAI ZHIMIN

Assignees

  • 浙江安胜吉智能科技有限公司

Dates

Publication Date
20260508
Application Date
20260131

Claims (10)

  1. 1. The blackening process for the surface of the air conditioner compressor cylinder body is characterized by comprising the following steps of: Step a, pre-degreasing, namely soaking a sintered cylinder body for 10-15min by using gasoline and trichloroethylene as solvents, then baking for 20-30min at 120-150 ℃, and evaporating greasy dirt in pores; step b, chemical degreasing, namely selecting sodium hydroxide, sodium carbonate, trisodium phosphate and a surfactant as alkaline degreasing fluid, soaking a cylinder for 15-25min at the temperature of 60-80 ℃ to remove residual saponified oil and impurities on the surface; step c, washing the cylinder body with water for 2 times, and washing the degreasing liquid out 3-5min each time; step d, pickling and activating, namely selecting 5% -10% of dilute hydrochloric acid or 8% -12% of sulfuric acid, soaking the cylinder for 1-3min at room temperature, removing oxide skin and rust on the surface of the cylinder, and activating the surface; Step e, secondary washing, namely fully rinsing the cylinder body by flowing clear water to avoid acid liquor residue; Step f, alkaline blackening, namely soaking a cylinder body into the blackening agent for blackening for 20-40min at the temperature of 138-142 ℃ by using 600-700g/L of sodium hydroxide, 100-150g/L of sodium nitrite, 20-30g/L of sodium nitrate and the blackening accelerator as blackening agents; Step g, three times of water washing, namely soaking the cylinder body for 1-3min by adopting flowing overflow hot water at 60-80 ℃ and then rinsing the cylinder body by adopting flowing clear water until the pH value of the surface of the cylinder body is neutral; step h, soaking oil and sealing, namely firstly drying the cylinder body at 80-100 ℃ for 30min, removing water in pores, then soaking the dehydrated rust-preventive oil, paraffin oil and organosilicon sealing agent at 60-80 ℃ for 20-30min; and i, air-drying at room temperature, and removing the superfluous sealing agent on the surface of the cylinder body to obtain a finished product.
  2. 2. The air conditioner compressor cylinder surface blackening process according to claim 1, wherein: In the steps a, b, d, f and h, the cylinder body (100) is subjected to layered tiling loading by adopting a material frame module (I), wherein the material frame module (I) comprises a mandrel piston assembly (1) at a central shaft and a material frame assembly (2) sleeved on the mandrel piston assembly (1), and a plurality of groups of material frame assemblies (2) are stacked; When the cylinder body is soaked, the mandrel piston assembly (1) runs, the soaking liquid is driven to flow in the material frame assembly (2) of each layer, and the split type material carrying plates (21) at the bottom of the material frame assembly (2) of each group are arranged in a staggered mode or in an inclined mode.
  3. 3. The air conditioner compressor block surface blackening process according to claim 2, wherein: In the step I, the cylinder body (100) is tiled and loaded in a layered manner by adopting a material frame module (I), wherein the material frame module (I) comprises a wind guide pipe assembly (3) at a central shaft and material frame assemblies (2) sleeved on the wind guide pipe assembly (3), and a plurality of groups of material frame assemblies (2) are stacked; During air cooling, the air guide pipe assembly (3) guides air flow blown by the bottom fan (4) to the central position of the material frame assembly (2) of each layer, and split type material carrying plates (21) at the bottom of the material frame assembly (2) of each group are arranged in a staggered mode or in an inclined staggered mode.
  4. 4. A process for blackening the surface of an air conditioner compressor cylinder as set forth in claim 3, wherein: The mandrel piston assembly (1) and the air guide pipe assembly (3) comprise a bottom bracket (11), a mounting rack (12), a guide pipe (13) and a top end cover (14); The bottom bracket (11) is arranged in an overhead manner, and a vertical flow guide pipe (13) is arranged at the center position of the bottom bracket (11); The installation frame (12) is fixedly installed on the bottom bracket (11), and the installation frame (12) is connected with the diversion pipe (13); the bottom of the flow guide pipe (13) is provided with an opening, and the side wall of the flow guide pipe (13) is provided with a plurality of flow guide holes (131); The top end cover (14) is arranged at the top of the flow guide pipe (13).
  5. 5. The air conditioner compressor block surface blackening process of claim 4, wherein: The mandrel piston assembly (1) further comprises a mounting block (15) and a piston (16); the installation block (15) is installed in the middle of the guide pipe (13), and the installation block (15) and the top end cover (14) are connected through a connecting rod (151); The piston (16) is arranged on the top end cover (14) and the mounting block (15) in a penetrating mode through the U-shaped guide rod (17), the piston (16) is arranged in a lifting mode, a limiting block (18) is arranged on the U-shaped guide rod (17), and the limiting block (18) is located above the mounting block (15).
  6. 6. The air conditioner compressor block surface blackening process of claim 4, wherein: the material frame assembly (2) further comprises a material frame (22), the material frame (22) comprises an inner ring (221) and an outer ring (222) which are concentrically arranged, the material carrying plates (21) are arranged in a fan shape, a plurality of groups of material carrying plates (21) are arranged around the circumference of the inner ring (221) at equal intervals, and the material carrying plates (21) are rotatably connected with the inner ring (221) through mounting posts (210); The inner ring (221), the outer ring (222) and the material carrying plate (21) are respectively provided with a plurality of through holes (200), and the through holes (200) are used for circulating the soaking liquid and the gas.
  7. 7. The air conditioner compressor block surface blackening process of claim 6, wherein: A plurality of positioning rings (211) are uniformly distributed on the material carrying plate (21), and the positioning rings (211) are sleeved with the cylinder body (100) to position the cylinder body (100).
  8. 8. The air conditioner compressor block surface blackening process of claim 6, wherein: Be provided with roof (23) between adjacent material frame subassembly (2), roof (23) with equidistant a plurality of lugs (231) of being provided with on the circumference of mounting bracket (12), this lug (231) with carry flitch (21) one-to-one setting, and this lug (231) will carry the outside edge jack-up of flitch (21).
  9. 9. The air conditioner compressor block surface blackening process of claim 8, wherein: When the material carrying plate (21) is arranged in a staggered mode, the height of the protruding block (231) is gradually reduced along the circumferential direction of the top plate (23) or the mounting frame (12), and the material carrying plate (21) is connected with the mounting column (210) through the rotating shaft (213) in a rotating fit mode.
  10. 10. The air conditioner compressor block surface blackening process of claim 8, wherein: when the material carrying plates (21) are obliquely arranged, the tops of the protruding blocks (231) are obliquely arranged, and the material carrying plates (21) are connected with the mounting columns (210) in a rotating fit manner through the ball heads (214).

Description

Blackening process for surface of air conditioner compressor cylinder body Technical Field The invention relates to the technical field of cylinder blackening treatment of air conditioner compressors, in particular to a cylinder surface blackening process of an air conditioner compressor. Background The cylinder body of the air conditioner compressor is manufactured by powder metallurgy compression molding, blackening treatment is needed to be carried out on the molded cylinder body, the blackening treatment is needed to be carried out on a powder metallurgy compression molding part, the core is that a layer of uniform, compact and strong-binding-force oxide film is formed on the porous surface of the powder metallurgy compression molding part, and the air conditioner compressor cylinder body mainly has the effects of rust prevention, wear resistance and decoration, and meanwhile, the dimensional accuracy and the pores are not blocked. When the prior cylinder body is used for blackening, the cylinder body is flatly paved on the material frame, and then the material frame is filled in the solvent degreasing tank, the alkaline degreasing tank, the washing tank, the pickling tank, the blackening tank and the oil soaking tank, so that the cylinder body carried in the material frame can be soaked in the corresponding tank through the soaking liquid to finish blackening. However, when the existing material frame is soaked in various reaction tanks through the soaking solution, as the cylinder bodies in the material frame are closely distributed and stacked in multiple layers, the flow of the soaking solution in the material frame is obviously disturbed, and particularly when the soaking solution is sealed, vacuumizing soaking is needed when necessary, so that ensuring the flow stability of the soaking solution in the material frame is a key for ensuring the blackening stability of the cylinder bodies. In addition, in particular, after the immersion oil is sealed, in order to remove the excessive sealing agent on the surface of the cylinder body, draining, drying or air drying is needed after the immersion oil is sealed, but when the existing material frame carries the cylinder body, air flow and heat cannot smoothly enter the material frame during the removal of the sealing agent, so that the removal efficiency of the sealing agent is greatly slowed down, and therefore, a cylinder body surface blackening process capable of solving the problems is needed. Disclosure of Invention According to the blackening process for the surface of the air conditioner compressor cylinder body, based on the existing blackening process, a specific material frame module is developed, when the cylinder body is loaded by the material frame module, the material frame module can enable soaking liquid to smoothly flow in the material frame in the blackening process, and meanwhile when sealing agent is removed, air flow and heat can smoothly flow in the material frame, so that blackening soaking uniformity of the cylinder body and sealing agent removing efficiency are improved. In order to achieve the above purpose, the present invention provides the following technical solutions: a blackening process for the surface of an air conditioner compressor cylinder body comprises the following steps: Step a, pre-degreasing, namely soaking a sintered cylinder body for 10-15min by using gasoline and trichloroethylene as solvents, then baking for 20-30min at 120-150 ℃, and evaporating greasy dirt in pores; step b, chemical degreasing, namely selecting sodium hydroxide, sodium carbonate, trisodium phosphate and a surfactant as alkaline degreasing fluid, soaking a cylinder for 15-25min at the temperature of 60-80 ℃ to remove residual saponified oil and impurities on the surface; step c, washing the cylinder body with water for 2 times, and washing the degreasing liquid out 3-5min each time; step d, pickling and activating, namely selecting 5% -10% of dilute hydrochloric acid or 8% -12% of sulfuric acid, soaking the cylinder for 1-3min at room temperature, removing oxide skin and rust on the surface of the cylinder, and activating the surface; Step e, secondary washing, namely fully rinsing the cylinder body by flowing clear water to avoid acid liquor residue; Step f, alkaline blackening, namely soaking a cylinder body into the blackening agent for blackening for 20-40min at the temperature of 138-142 ℃ by using 600-700g/L of sodium hydroxide, 100-150g/L of sodium nitrite, 20-30g/L of sodium nitrate and the blackening accelerator as blackening agents; Step g, three times of water washing, namely soaking the cylinder body for 1-3min by adopting flowing overflow hot water at 60-80 ℃ and then rinsing the cylinder body by adopting flowing clear water until the pH value of the surface of the cylinder body is neutral; step h, soaking oil and sealing, namely firstly drying the cylinder body at 80-100 ℃ for 30min, removing water in pores, then soaking the deh