Fluoroplastic composite metal axial flow pump body forming process

Abstract

The invention discloses a fluoroplastic composite metal axial flow pump body forming process which comprises the following steps: firstly, processing a metal pump body shell, and carrying out surface roughening treatment, oil stain treatment and rust prevention treatment on the inner surface of the metal pump body shell by adopting a shot blasting and sand blasting process; heating to 100 DEG C to 120 DEG C, and keeping the temperature for 2h to 3h; the preparation method comprises the following steps: preparing a metal pump body shell, spraying a 0.2 mm-0. 3mm priming coat on the inner surface of the metal pump body shell, preheating to 300-320 DEG C, melt-blowing a 2mm-4mm functional layer on the priming coat of the metal pump body shell by adopting melt-blowing equipment, placing the composite metal pump body in a high-pressure environment, and naturally cooling for more than 12 hours to obtain the composite metal pump body product. The composite pump body produced by adopting the forming process disclosed by the invention has the corrosion resistance of fluoroplastic and the structural strength of a metal shell.

Description

Technical Field

[0001] The invention relates to a molding process for an axial flow pump body made of fluoroplastic composite metal material, belonging to the technical field of fluid machinery. Background Art

[0002] Fluoroplastic is a non-metallic material with strong resistance to acid and alkali chemical corrosion and is usually used in highly corrosive workstations.

[0003] Axial flow pumps are core equipment in the evaporation process of the phosphorus chemical industry. Their primary function is to transport corrosive media for concentrated circulation. The pump body is a key flow component in these pumps. The pump body consists of two main sections: a cylindrical elbow-shaped area for the medium's flow and a structural area for sealing and transmission.

[0004] Currently, the pump bodies of commonly used axial-flow pumps are primarily metal castings or welded components. Due to the inherent properties of metal, these pump bodies are subject to wear and corrosion during use. Metal ions removed by wear and corrosion enter the medium, reacting and mixing with the medium's own ionic compounds to form new compounds. Users with high requirements for medium purity require additional equipment to separate the metal ions, which increases production costs. Pump bodies made of pure fluoroplastics have low structural strength and poor impact resistance. They cannot withstand the extrusion and shear stresses generated during medium transportation, making them unsuitable for industrial use. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem of metal ion contamination of the medium in traditional metal pump bodies and the problems of poor bonding ability with the metal shell, poor overall structural rigidity, weak impact resistance, and high production cost during the molding process of traditional composite pump bodies. To this end, a fluoroplastic composite metal material axial flow pump body molding process is provided.

[0006] The purpose of the present invention is achieved through the following technical solutions.

[0007] The present invention provides a fluoroplastic composite metal axial flow pump body forming process, the specific steps of the forming process comprising:

[0008] 1) Processing of metal pump shell;

[0009] 2) Use shot blasting technology to roughen the inner surface of the metal pump body shell and remove existing burrs and sharp corners. The surface roughness after treatment is generally required to reach Sa2.5 or above;

[0010] Wherein, the shot blasting process uses quartz sand with a particle size of 0.5mm-1.5mm.

[0011] 3) Carry out oil stain treatment and rust prevention treatment on the inner surface of the metal pump shell;

[0012] 4) Place the metal pump shell in an oven and heat it to 100-120°C for 2-3 hours;

[0013] 5) A 0.2mm-0.3mm thick primer layer is sprayed on the inner surface of the treated metal pump shell. The primer layer is made of phenolic resin or epoxy resin.

[0014] 6) Preheating the metal pump body shell with the primer sprayed on the inner surface to 300-320°C, and using a melt-blowing device to melt-blown a 2mm-4mm functional layer on the primer of the metal pump body shell to obtain a composite metal pump body;

[0015] The functional layer is made of fluoroplastic material;

[0016] 7) After melt-blowing is completed, the composite metal pump body is placed in a high-pressure environment and naturally cooled for more than 12 hours to obtain a composite metal pump body product.

[0017] The functional layer is preferably composed of 3%-15% carbon fiber material and 85%-97% fluoroplastic material.

[0018] The metal pump shell is preferably made of duplex steel or austenitic stainless steel.

[0019] The metal pump body shell is preferably processed by welding or casting.

[0020] All edges on the inner surface of the metal pump body shell are designed to be rounded transitions.

[0021] Beneficial effects

[0022] The molding process of the present invention has high reliability and obvious application effect. The composite pump body produced by this molding process has both the corrosion resistance of fluoroplastics and the structural strength of the metal shell. In addition, by adding carbon fiber to the fluoroplastic material and performing modification treatment, its wear resistance, flexibility and impact resistance after molding can be improved.

[0023] The composite pump body produced using this molding process has precisely controlled external dimensions, which reduces processing workload and manufacturing costs. Accordingly, the dimensions of the flow area inside the pump body can fully meet the design requirements, and the surface of the functional layer is smooth and not easy to fall off, reducing the friction loss of the pump body; the functional layer can be repaired and reused, greatly reducing the user's operating costs. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the embodiments:

[0025] Example

[0026] The present invention provides a fluoroplastic composite metal axial flow pump body forming process, the specific steps of the forming process comprising:

[0027] 1) Processing of metal pump shell;

[0028] 2) Use shot blasting technology to roughen the inner surface of the metal pump body shell and remove existing burrs and sharp corners. The surface roughness after treatment is generally required to reach Sa2.5 or above;

[0029] 3) Carry out oil stain treatment and rust prevention treatment on the inner surface of the metal pump shell;

[0030] 4) Place the metal pump housing in an oven, heat to 110°C and keep warm for 2 hours;

[0031] 5) A 0.25 mm thick primer layer is sprayed on the inner surface of the treated metal pump housing. The primer layer is made of phenolic resin or epoxy resin.

[0032] 6) Preheating the metal pump body shell with the primer sprayed on the inner surface to 310°C, and using a melt-blowing device to melt-blown a 2mm-4mm functional layer on the primer of the metal pump body shell to obtain a composite metal pump body;

[0033] The functional layer is composed of 10% carbon fiber material and 90% fluoroplastic material;

[0034] 7) After melt-blowing is completed, the composite metal pump body is placed in a high-pressure environment and naturally cooled for 12 hours to obtain a composite metal pump body product.

Claims

1. A process for forming an axial flow pump body made of fluoroplastic composite metal, characterized in that: The specific steps of the molding process include: 1) Processing metal pump shell; 2) Use shot blasting technology to roughen the inner surface of the metal pump shell and remove the burrs and sharp corners. The surface roughness after treatment is generally required to reach Sa2.5 or above; Wherein, the shot blasting process uses quartz sand with a particle size of 0.5mm-1.5mm. 3) Carry out oil stain and rust prevention treatment on the inner surface of the metal pump shell; 4) Place the metal pump casing in an oven and heat it to 100-120°C for 2-3 hours; 5) A primer layer of 0.2 mm to 0.3 mm is sprayed on the inner surface of the treated metal pump body shell, and the material of the primer layer is phenolic resin or epoxy resin; 6) Preheating the metal pump body shell with the primer sprayed on the inner surface to 300-320° C., and using a melt-blowing device to melt-blown a 2mm-4mm functional layer on the primer of the metal pump body shell to obtain a composite metal pump body; The functional layer is made of fluoroplastic material; 7) After melt-blowing is completed, the composite metal pump body is placed in a high-pressure environment and naturally cooled for more than 12 hours to obtain a composite metal pump body product.

2. The molding process according to claim 1, characterized in that: The functional layer is composed of 3%-15% carbon fiber material and 85%-97% fluoroplastic material.

3. The molding process according to claim 1 or 2, characterized in that: The metal pump body shell is made of duplex steel or austenitic stainless steel.

4. The molding process according to claim 1 or 2, characterized in that: The metal pump body shell is processed by welding or casting.

5. The molding process according to claim 1 or 2, characterized in that: All edges of the inner surface of the metal pump body shell are designed to be rounded transitions.