Preparation technology of single screw pump rotor

Abstract

The present invention provides a preparation process of a single screw pump rotor, and the preparation process of the single screw pump rotor comprises the following steps: S10: selecting a rotor body; S20: mixing Teflon dispersion, cosolvent and deionized water to form a first mixed liquid, a second mixed liquid and a third mixed liquid respectively; S30: adding resin material and adhesive to the first mixed liquid to form a bottom coating and spraying it to the periphery of the rotor body to form a bottom layer; S40: adding wear-resistant powder and acrylic emulsion to the second mixed liquid to form an intermediate coating and spraying it to the periphery of the bottom layer to form an intermediate layer; S50: adding acrylic emulsion to the third mixed liquid to form an outer coating and spraying it to the periphery of the intermediate layer to form a single screw pump rotor. The single screw pump rotor of the present invention has self-lubricating ability and wear resistance, thereby effectively enhancing the service life of the single screw pump rotor.

Description

Technical Field

[0001] The invention belongs to the technical field of rotors, and in particular relates to a preparation process of a single-screw pump rotor. Background Art

[0002] The single screw pump is a rotor type positive displacement pump. It is an internally meshed closed screw pump that relies on the meshing of the screw and the bushing to produce volume changes in the suction chamber and the discharge chamber to transport liquid. The main working parts of the single screw pump are composed of a bushing (stator) with a double-headed spiral cavity and a single-headed spiral screw (rotor) meshed with it in the stator cavity. It has the outstanding characteristics of high adaptability to the medium, stable flow, small pressure pulsation, and high self-priming ability. However, the single screw pump does not have the wear-resistant and self-lubricating functions, so that the rotor squeezes and rubs against the stator during rotation, which is very easy to be damaged by friction and has a short service life. Usually, in order to increase the life of the single screw pump, more expensive materials are used to produce single screw pumps instead of traditional materials, but this method is more expensive. Summary of the invention

[0003] The embodiment of the present invention provides a preparation process of a single screw pump rotor, aiming to solve the problem in the prior art that the single screw pump rotor is easily worn out, resulting in a short service life, and the production cost is high when the material is directly replaced.

[0004] To achieve the above object, the technical solution adopted by the present invention is: to provide a preparation process of a single screw pump rotor, comprising the following steps:

[0005] S10: Select the rotor body, which is made of carbon steel or aluminum alloy;

[0006] S20: mixing the Teflon dispersion, the co-solvent and the deionized water according to a preset ratio to form a first mixed liquid, a second mixed liquid and a third mixed liquid;

[0007] S30: adding a preset ratio of resin material and adhesive to the first mixed liquid to form a primer, and spraying the primer to the outer circumference of the rotor to form a base layer after solidification;

[0008] S40: adding a preset ratio of wear-resistant powder and acrylic emulsion to the second mixed liquid to form an intermediate coating, and spraying the intermediate coating to the periphery of the bottom layer to form an intermediate layer after solidification;

[0009] S50: adding a preset proportion of acrylic emulsion to the third mixed liquid to form an outer coating, spraying the outer coating to the periphery of the middle layer, and forming a single-screw pump rotor after solidification.

[0010] In a possible implementation, the rotor body further includes a pretreatment step before each spraying:

[0011] placing the rotor body into a preheating furnace;

[0012] The temperature in the preheating furnace is maintained at 50-70° C., and the mixture is taken out after a preset time.

[0013] In a possible implementation, the rotor body further includes a sintering step after each spraying:

[0014] Placing the rotor body in a sintering furnace, raising the temperature of the sintering furnace to 410-430° C., and maintaining the temperature for a preset time;

[0015] The sintering furnace is closed, and the rotor body is taken out after being cooled to room temperature.

[0016] In a possible implementation, the base coating is sprayed at least twice continuously, and / or the outer coating is sprayed at least twice continuously.

[0017] In a possible implementation, when the base coating is sprayed at least twice, the spraying speed of the multiple layers of the base coating is increased successively;

[0018] When the outer layer coating is sprayed at least twice, the spraying speed of the multiple layers of the outer layer is increased successively.

[0019] In a possible implementation manner, the resin material is a mixture of one or more of polyamide-imide, polyethersulfone, and polyphenylene sulfide.

[0020] In a possible implementation, the wear-resistant powder is a mixture of one or more of ore powder, silicon carbide powder, titanium powder, and molybdenum disulfide.

[0021] In a possible implementation, the Teflon dispersion includes a polytetrafluoroethylene dispersion and a soluble polytetrafluoroethylene dispersion.

[0022] In a possible implementation, the base coating, the intermediate coating and the outer coating are all placed in a liquid storage tank for spraying. The liquid storage tank is connected to an air compressor, and the spraying pressure of the liquid storage tank is 0.2-0.4 MPa.

[0023] In a possible implementation, the mass ratio of Teflon dispersion, cosolvent, resin material, adhesive and deionized water in the primer is: 48:2:12:13:25;

[0024] The mass ratio of Teflon dispersion, cosolvent, acrylic emulsion, wear-resistant powder and deionized water in the intermediate coating is: 53:2:15:20:10;

[0025] The mass ratio of Teflon dispersion, cosolvent, acrylic emulsion and deionized water in the outer coating is 68:2:20:10.

[0026] In the embodiment of the present application, compared with the prior art, a base coating, an intermediate coating and an outer coating with different functions are formed by mixing them according to different components and different proportions, and then the three layers of coating are sprayed to the periphery of the rotor body in a preset order, and finally solidified to form a single screw pump rotor, wherein the base coating and the outer coating need to be sprayed at least twice in succession, and the outer coating contains a large amount of polytetrafluoroethylene dispersion. After solidification to form a rotor, it can be applied to almost all media except elemental fluorine and alkali metals. The preparation process of the single screw pump rotor of the present invention sprays three layers of coating on the periphery of the rotor body, and each layer of coating has a different main function, so that the rotor body has self-lubricating ability and wear resistance, effectively reducing the friction between the rotor and the stator when they rotate and squeeze each other, thereby effectively enhancing the service life of the single screw pump rotor, and the rotor has a high degree of commonality, which can effectively reduce the manufacturing cost in mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A front view structural schematic diagram of a preparation process of a single screw pump rotor provided in Embodiment 1 of the present invention;

[0028] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at the position shown at AA.

[0029] Description of reference numerals:

[0030] 10- rotor body;

[0031] 20- bottom floor;

[0032] 30-middle layer;

[0033] 40-Outer layer. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] Please also read Figure 1 and Figure 2 Now, the preparation process of the single screw pump rotor provided by the present invention is described. The preparation process of the single screw pump rotor comprises the following steps:

[0036] S10: Select a rotor body 10, which is made of carbon steel or aluminum alloy;

[0037] S20: mixing the Teflon dispersion, the co-solvent and the deionized water according to a preset ratio to form a first mixed liquid, a second mixed liquid and a third mixed liquid;

[0038] S30: adding a preset ratio of resin material and adhesive to the first mixed liquid to form a primer, and spraying it to the outer periphery of the rotor body 10 to form a base layer 20 after solidification;

[0039] S40: adding a preset ratio of wear-resistant powder and acrylic emulsion to the second mixed liquid to form an intermediate coating, spraying the intermediate coating to the periphery of the bottom layer 20 and solidifying to form an intermediate layer 30;

[0040] S50: adding a preset proportion of acrylic emulsion to the third mixed liquid to form an outer coating, spraying the outer coating to the periphery of the middle layer 30, and forming a single screw pump rotor after solidification.

[0041] It should be noted that although the first mixed liquid, the second mixed liquid and the third mixed liquid all use Teflon dispersion, co-solvent and deionized water, the proportions used are different.

[0042] In the embodiment of the present application, compared with the prior art, during the preparation process, Teflon dispersion, cosolvent, deionized water, resin material and adhesive are formed into a base coating according to a preset ratio, and then the base coating is sprayed and solidified to form a base layer 20. The addition of resin material effectively increases the bonding force between the base layer 20 and the surface of the rotor body 10, so that the base layer 20 cannot be easily fallen off from the surface of the rotor body 10. Teflon dispersion, cosolvent, deionized water, acrylic emulsion and wear-resistant powder are formed into an intermediate coating according to a preset ratio, and the intermediate coating is sprayed and solidified to form an intermediate layer 30. Wear-resistant powder is added to the intermediate coating to reduce deformation and improve wear resistance. Teflon dispersion, cosolvent, acrylic emulsion and deionized water are formed into an outer coating according to a preset ratio and then sprayed and solidified to form a single-screw pump rotor.

[0043] Compared with the prior art, the preparation process of the single-screw pump rotor of the present invention forms a base coating, an intermediate coating and an outer coating with different functions by adding different materials according to different requirements and mixing them according to their respective preset proportions. The base coating, the intermediate coating and the outer coating are sprayed to the periphery of the rotor body 10 in sequence and solidified to form a single-screw pump rotor. By adding resin material to the base coating, wear-resistant powder to the intermediate coating and Teflon dispersion to the outer coating, the coating formed by spraying and solidification is not easy to fall off from the periphery of the rotor body 10, thereby enhancing the deformation resistance and self-lubrication ability of the rotor body 10, effectively enhancing the wear resistance of the rotor body 10, and thus effectively extending the service life of the single-screw pump rotor of the present application, and reducing the manufacturing cost during batch manufacturing; by spraying the rotor body 10 to form the base layer 20, the intermediate layer 30 and the outer layer 40, the rotor body 10 can be made of cheaper carbon steel or aluminum alloy material to reduce costs.

[0044] Optionally, as another variation of preparing a single-screw pump rotor, the surface of the rotor body 10 can be hardened, such as by hard anodizing or thermal spraying of aluminum alloy (as an intermediate layer 30), and then spraying the bottom layer 20 and the outer layer 40, which can also improve its wear resistance.

[0045] It should be noted that, in this embodiment, the term “coating” is a general term for the base layer 20 , the middle layer 30 and the outer layer 40 .

[0046] In some embodiments, the rotor body 10 further includes a pretreatment step before each spraying:

[0047] Place the rotor body 10 into a preheating furnace;

[0048] Maintain the temperature in the preheating furnace at 50-70°C and take it out after the preset time.

[0049] By preheating the rotor body 10 before spraying, the temperature difference between the coating and the rotor body 10 can be effectively reduced, the bonding strength of the coating can be improved, and the coating is not easy to crack. The moisture in the rotor body 10 can also be effectively removed, and the stress caused by the shrinkage inconsistency of the rotor body 10 and the coating during cooling after spraying is effectively reduced, which is beneficial to the bonding of the coating and the rotor body 10; limiting the temperature range of preheating the rotor body 10 can reduce the fatigue strength of the coating after spraying the rotor body 10, effectively improve the service life of the coating, and thus improve the service life of the rotor body 10.

[0050] Optionally, the preset duration may be 10 minutes.

[0051] In some embodiments, the rotor body 10 further includes a sintering step after each spraying:

[0052] Place the rotor body 10 in a sintering furnace, raise the temperature of the sintering furnace to 410-430° C., and maintain the temperature for a preset time;

[0053] The sintering furnace is closed, and the rotor body 10 is taken out after being cooled to room temperature.

[0054] After the coating is sprayed on the rotor body 10, it is inevitable that there will be defects such as unmelted spherical particles, incomplete sintering between particles, pores, microcracks and low interface bonding strength. These defects seriously affect the performance of the coating. Sintering the rotor body 10 after each spraying can effectively solve the defects such as unmelted spherical particles, incomplete sintering between particles, pores, microcracks and low interface bonding strength, thereby effectively improving the service life of the coating. Sintering the rotor body 10 after spraying can also solidify the coating, thereby making the coating have good adhesion. Limiting the temperature range for sintering the rotor body 10 can solidify the coating within an appropriate temperature and maintain the temperature for a preset period of time, thereby allowing the coating to obtain a smoothness with optimal adhesion properties.

[0055] Optionally, the temperature of the sintering furnace may be 420° C., and the preset time may be 35 minutes.

[0056] In some embodiments, the base coating is sprayed at least twice continuously, and / or the outer coating is sprayed at least twice continuously. Compared with the situation where the base coating and / or the outer coating are sprayed only once, which easily causes uneven spraying in some parts and the coating is too thin, causing the rotor body 10 to be easily worn and shorten the life due to the thinness in some parts, spraying the base coating and the outer coating at least twice effectively avoids uneven thickness of each coating layer, improves the spraying quality of the coating, and thus prolongs the service life of the rotor body 10.

[0057] In some embodiments, when the bottom coating is sprayed at least twice, the spraying speed of the multi-layer bottom layer 20 is increased successively; when the outer coating is sprayed at least twice, the spraying speed of the multi-layer outer layer 40 is increased successively. During the spraying process of the multi-layer bottom layer 20, the spraying speed is higher as it is sprayed outwards, and the spraying process of the multi-layer outer layer 40 is similar, the spraying speed is higher as it is sprayed outwards, which improves the production efficiency while improving the adhesion of the coating on the rotor body 10, ensuring the spraying effect of the coating, and thus effectively improving the use effect of the single-screw pump rotor of the present application.

[0058] For example, the bottom layer 20 is sprayed in two layers, the spraying speed of the first layer 20 is 4 cm / min, and the spraying speed of the second layer 20 is 6 cm / min; the outer layer 40 is sprayed in two layers, the spraying speed of the first layer 40 is 4 cm / min, and the spraying speed of the second layer 40 is 6 cm / min. In this case, the spraying speed of the outer layer 40 is the same as that of the bottom layer 20, or the spraying speed of the first layer 40 can be 5 cm / min, and the spraying speed of the second layer 40 can be 7 cm / min. The actual spraying speed is determined according to on-site requirements.

[0059] In some embodiments, the resin material is a mixture of one or more of polyamide-imide, polyethersulfone, and polyphenylene sulfide. For example, only polyamide-imide is added to the first mixed solution, or polyamide-imide and polyphenylene sulfide are added to the first mixed solution at the same time. The amide bond or imide bond in the resin material can exhibit good bonding strength with the metal substrate, improve the bonding strength of the base coating, and prevent it from falling off, thereby effectively extending the service life of the rotor body 10.

[0060] In some embodiments, the wear-resistant powder is a mixture of one or more of ore powder, silicon carbide powder, titanium powder, and molybdenum disulfide.

[0061] These materials have the characteristics of high hardness, strong impact resistance and good adhesion, which can reduce deformation and improve wear resistance. Molybdenum disulfide, as a wear-resistant powder, has excellent wear resistance, load-bearing and lubrication properties. It not only plays the role of surface protection, corrosion prevention, sealing, lubrication and extending the service life of parts, but also has the characteristics of a wide range of applicable temperature, load and speed changes.

[0062] In some embodiments, the Teflon dispersion includes a polytetrafluoroethylene dispersion and a soluble polytetrafluoroethylene dispersion. The polytetrafluoroethylene dispersion can be used for a long time at -180°C to 260°C, has the characteristics of being resistant to acid, alkali and various organic solutions, and has an extremely low friction coefficient, and has a certain self-lubricating effect during the rotation process; the soluble polytetrafluoroethylene is a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, and its melt adhesion is enhanced, which effectively reduces the viscosity of the solution; the use of the polytetrafluoroethylene dispersion and the soluble polytetrafluoroethylene dispersion together can effectively reduce the friction between the rotor and the stator, thereby extending the service life of the single-screw pump rotor.

[0063] Optionally, the polytetrafluoroethylene dispersion may be a concentrated polytetrafluoroethylene dispersion, and the soluble polytetrafluoroethylene dispersion may be a concentrated soluble polytetrafluoroethylene dispersion.

[0064] In some embodiments, the base coating, the middle coating and the outer coating are all placed in a liquid storage tank for spraying. The liquid storage tank is connected to an air compressor, and the spraying pressure of the liquid storage tank is 0.2-0.4 MPa.

[0065] Compared with the situation where the spraying pressure is less than 0.2Mpa or greater than 0.4Mpa, the spraying effect is not good due to the spraying pressure being too small or too large, limiting the spraying pressure range in the liquid storage tank can effectively ensure the spraying effect of the spray gun of the spray machine.

[0066] Optionally, the spraying pressure of the storage tank may be 0.3 MPa.

[0067] In some embodiments, the mass ratio of Teflon dispersion, cosolvent, resin material, adhesive and deionized water in the primer is: 48:2:12:13:25;

[0068] The mass ratio of Teflon dispersion, cosolvent, acrylic emulsion, wear-resistant powder and deionized water in the intermediate coating is: 53:2:15:20:10;

[0069] The mass ratio of Teflon dispersion, cosolvent, acrylic emulsion and deionized water in the outer coating is 68:2:20:10.

[0070] By limiting the proportions of the components in the base coating, the middle coating and the outer coating, the components are used in combination to effectively ensure that the base layer 20, the middle layer 30 and the outer layer 40 can fully play their respective roles, reduce the wear between the rotor body 10 and the stator, and thus extend the service life of the rotor body 10.

[0071] For example, the primer comprises: 33% of polytetrafluoroethylene concentrated dispersion, 15% of soluble polytetrafluoroethylene concentrated dispersion, 2% of co-solvent, 12% of resin material, 13% of adhesive and 25% of deionized water;

[0072] The intermediate coating comprises: 43% of polytetrafluoroethylene concentrated dispersion, 10% of soluble polytetrafluoroethylene concentrated dispersion, 2% of cosolvent, 15% of acrylic acid solution, 20% of molybdenum disulfide and 10% of deionized water;

[0073] The outer coating comprises: 63% of polytetrafluoroethylene concentrated dispersion, 5% of soluble polytetrafluoroethylene concentrated dispersion, 2% of cosolvent, 20% of acrylic emulsion and 10% of deionized water.

[0074] Optionally, the binder in the primer may be silica sol.

[0075] A specific implementation of the embodiment of the present application is:

[0076] (1) Select the rotor body, which is made of carbon steel or aluminum alloy;

[0077] (2) taking a preset weight of materials and mixing them in a ratio of 33% polytetrafluoroethylene dispersion, 15% soluble polytetrafluoroethylene dispersion, 2% cosolvent, 12% polyamideimide, 13% silica sol and 25% deionized water to form a primer, and stirring for about 20-30 minutes to disperse it;

[0078] (3) The machined rotor body (surface roughness 0.6 μm) is placed in a furnace at 60°C for preheating for 10 min, the primer is poured into the storage tank of the spray gun, the air compressor is connected, the pressure is adjusted to be stable at about 0.3 MPa, and the rotor body is sprayed at a spraying speed of 4 cm / min. After spraying, the rotor body is sent to a sintering furnace, the furnace temperature is raised to 420°C and kept warm for 35 min. After completion, the rotor body is naturally air-cooled to room temperature to form the first bottom layer on the surface of the rotor body;

[0079] (5) The rotor body cooled to room temperature to form the first bottom layer is placed in a furnace at 60°C for preheating for 10 minutes, the bottom layer coating is poured into the storage tank of the spray gun, the air compressor is connected, the pressure is adjusted to be stable at about 0.3MPa, and the rotor body is sprayed at a spraying speed of 6cm / min. After the spraying is completed, the rotor body is sent to a sintering furnace, the furnace temperature is raised to 420°C and kept warm for 35 minutes. After completion, the rotor body is naturally air-cooled to room temperature to form a bottom layer on the surface of the rotor body;

[0080] (6) taking a preset weight of materials and mixing them in a ratio of 43% polytetrafluoroethylene dispersion, 10% soluble polytetrafluoroethylene dispersion, 2% cosolvent, 15% acrylic acid solution, 20% molybdenum disulfide and 10% deionized water to form an intermediate coating, and stirring for about 20-30 minutes to disperse it;

[0081] (7) The rotor body with the bottom layer formed is placed in a furnace at 60°C for preheating for 10 minutes, the intermediate coating is poured into the storage tank of the spray gun, the air compressor is connected, the pressure is adjusted to be stable at about 0.3MPa, and the rotor body is sprayed at a spraying speed of 4cm / min. After the spraying is completed, the rotor body is sent to the sintering furnace, the furnace temperature is raised to 420°C and kept warm for 35 minutes. After completion, the rotor body is naturally air-cooled to room temperature to form an intermediate layer on the surface of the rotor body;

[0082] (8) taking a preset weight of materials and mixing them in a ratio of 63% polytetrafluoroethylene dispersion, 5% soluble polytetrafluoroethylene dispersion, 2% cosolvent, 20% acrylic acid solution and 10% deionized water to form an outer coating, and stirring for about 20-30 minutes to disperse them;

[0083] (9) The rotor body forming the middle layer is placed in a furnace at 60° C. for preheating for 10 minutes, the outer layer coating is poured into the storage tank of the spray gun, the air compressor is connected, the pressure is adjusted to be stable at about 0.3 MPa, and the rotor body is sprayed at a spraying speed of 4 cm / min. After the spraying is completed, the rotor body is sent to a sintering furnace, the furnace temperature is raised to 420° C. and kept warm for 35 minutes. After completion, the rotor body is naturally air-cooled to room temperature to form the first outer layer on the surface of the rotor body;

[0084] (10) The rotor body that has been cooled to room temperature to form the first outer layer is placed in a furnace at 60°C for preheating for 10 minutes. The outer layer coating is poured into the storage tank of the spray gun, and the air compressor is connected. The pressure is adjusted to be stable at about 0.3 MPa, and the rotor body is sprayed at a spraying speed of 6 cm / min. After spraying, the rotor body is sent to a sintering furnace, the furnace temperature is raised to 420°C and kept warm for 35 minutes. After completion, the rotor body is naturally air-cooled to room temperature to form a second outer layer on the surface of the rotor body, and the single-screw pump rotor is manufactured.

[0085] It should be noted that the above steps (5) and (10) are optional steps, that is, when the bottom layer is sprayed with n layers, step (5) is repeated (n-1) times, and the spraying speed is increased successively in the multiple repetitions of step (5); similarly, when the outer layer is sprayed with m layers, step (10) is repeated (m-1) times, and the spraying speed is increased successively in the multiple repetitions of step (10).

[0086] 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 in the protection scope of the present invention.

Claims

1. A process for preparing a single screw pump rotor, characterized in that: The following steps are involved: S10: Select the rotor body, which is made of carbon steel or aluminum alloy; S20: mixing the Teflon dispersion, the co-solvent and the deionized water according to a preset ratio to form a first mixed liquid, a second mixed liquid and a third mixed liquid; S30: adding a preset ratio of resin material and adhesive to the first mixed liquid to form a primer, and spraying the primer to the outer circumference of the rotor body to form a base layer after solidification; S40: adding a preset ratio of wear-resistant powder and acrylic emulsion to the second mixed liquid to form an intermediate coating, and spraying the intermediate coating to the periphery of the bottom layer to form an intermediate layer after solidification; S50: adding a preset proportion of acrylic emulsion to the third mixed liquid to form an outer coating, spraying the outer coating to the periphery of the intermediate layer, and forming a single screw pump rotor after solidification; The rotor body also includes a pretreatment step before each spraying: placing the rotor body into a preheating furnace; Maintain the temperature in the preheating furnace at 50-70°C and take it out after a preset time; By preheating the rotor body before spraying, the temperature difference between the coating and the rotor body can be effectively reduced, the bonding strength of the coating can be improved, and the coating is not easy to crack. It can also effectively remove moisture in the rotor body and effectively reduce the stress caused by the shrinkage inconsistency between the rotor body and the coating during cooling after spraying, which is beneficial to the bonding of the coating and the rotor body. Limiting the temperature range of preheating the rotor body can reduce the fatigue strength of the coating after the rotor body is sprayed, effectively improving the service life of the coating, and thus improving the service life of the rotor body. The rotor body also includes a sintering step after each spraying: Placing the rotor body in a sintering furnace, raising the temperature of the sintering furnace to 410-430° C., and maintaining the temperature for a preset time; Turn off the sintering furnace, cool the rotor body to room temperature and then take it out; After spraying the paint on the rotor body, it is inevitable that there will be defects such as unmelted spherical particles, incomplete sintering between particles, pores, microcracks and low interface bonding strength. These defects seriously affect the performance of the coating. Sintering the rotor body after each spraying can effectively solve the defects such as unmelted spherical particles, incomplete sintering between particles, pores, microcracks and low interface bonding strength, thereby effectively improving the service life of the coating. Sintering after spraying the rotor body can also solidify the coating, thereby making the coating have good adhesion; limiting the temperature range for sintering the rotor body can solidify the coating within the appropriate temperature and maintain the temperature for a preset period of time, thereby allowing the coating to obtain a smoothness with optimal adhesion properties.

2. The process for preparing a single screw pump rotor according to claim 1, characterized in that: The base coating is sprayed at least twice continuously, and / or the outer coating is sprayed at least twice continuously.

3. The process for preparing a single screw pump rotor according to claim 2, characterized in that: When the base coating is sprayed at least twice, the spraying speed of the multiple layers of the base coating is increased successively; When the outer layer coating is sprayed at least twice, the spraying speed of the multiple layers of the outer layer is increased successively.

4. The process for preparing a single screw pump rotor according to claim 1, characterized in that: The resin material is a mixture of one or more of polyamide-imide, polyethersulfone and polyphenylene sulfide.

5. The process for preparing a single screw pump rotor according to claim 1, characterized in that: The wear-resistant powder is a mixture of one or more of ore powder, silicon carbide powder, titanium powder and molybdenum disulfide.

6. The process for preparing a single screw pump rotor according to claim 1, characterized in that: The Teflon dispersion includes a polytetrafluoroethylene dispersion and a soluble polytetrafluoroethylene dispersion.

7. The process for preparing a single screw pump rotor according to claim 1, characterized in that: The base coating, the middle coating and the outer coating are all placed in a liquid storage tank for spraying. The liquid storage tank is connected to an air compressor, and the spraying pressure of the liquid storage tank is 0.2-0.4Mpa.

8. The process for preparing a single screw pump rotor according to claim 1, characterized in that: The mass ratio of Teflon dispersion, cosolvent, resin material, adhesive and deionized water in the primer is: 48:2:12:13:25; The mass ratio of Teflon dispersion, cosolvent, acrylic emulsion, wear-resistant powder and deionized water in the intermediate coating is: 53:2:15:20:10; The mass ratio of Teflon dispersion, cosolvent, acrylic emulsion and deionized water in the outer coating is 68:2:20:10.

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