2016年12月5日星期一
2016年12月4日星期日
Development of wear protection of submersible pump
China in the 20th century, 60,70 began to epoxy resin and its compounds used in submersible pumps for anti-wear protection. In the 20th century, 80 years and have developed a composite dragon coating, polyurethane coating imitation ceramic coating and rubber coating and other non-metallic coating. In addition, there are some non-metallic coatings formed by the use of titanium rubber, rubber, enamel, ceramics, glass and other materials, due to complex processing and other reasons less. The 20th century, 90 years, in the industrial sector has also introduced the United States DEVCON repair agent, ARC composite coatings, artificial rubber coating, and other polymer materials. These non-metallic coating materials in the pumping station of the poor use of the environment, often due to coating and metal matrix bonding capacity is poor and the material itself is not enough hardness, it is difficult to achieve the desired anti-cavitation, anti-erosion effect.
Metal coating research:
In the submersible pump anti-wear surface protection technology is also widely used in metal surface protective layer. The most used is the electrode welding and wire coating. The use of stainless steel electrode welding method can ensure that the welding layer and the substrate has a high bond strength, but the surfacing welding dilution rate, welding layer thickness and uneven processing allowance, the work of the matrix material solderability requirements . Submersible pump surface treatment by surfacing, generally in the surfacing did not occur before the cavitation damage, in the welding spot around the rapid occurrence of new cavitation damage, until the bottom layer of surfacing. Wire spray coating formed by the stainless steel spray particles to the mechanical combination of the main, not suitable for submersible pumps impact load and anti-cavitation repair. For some large submersible pump workpieces, such as large diameter (diameter 3 meters above) axial flow impeller chamber, can be embedded in the surface layer of stainless steel plate to increase the anti-erosion ability. However, this method requires the workpiece sent to a large submersible pump factory specialized processing, turning, mosaic, welding, expensive, long cycle, non-general submersible pump station can be implemented. Alloy powder coating is developed on the basis of wire coating. Compared with the welding method, forming beautiful and smooth, easy to control the thickness, dilution rate is small, the method is simple, easy to get heat, processing from the climate, site constraints. However, since the sprayed layer is formed by superimposing the alloy powder particles in a semi-molten state at a high speed on the surface of the substrate in a layer-by-layer manner, it belongs to a layered structure, and its physical properties have directivity, and during the spraying process, Powder particles are the occurrence of condensation, shrinkage, deformation and other phenomena in the coating development of an internal stress, so the alloy powder coating is generally only used for cavitation and abrasion less serious surface protection of small and medium submersible pumps.
Surface protection materials and process requirements:
(2) has a toughness to absorb the impact energy; (3) has a very high strength and hardness to resist cavitation, erosion damage; (2) has a toughness to absorb impact energy; To ensure that the coating in the pump 30-35 m per second under the impact of high-speed water will not be peeling off; (4) coating materials must be affordable to ensure that the large and medium-sized submersible pumping stations and a wide range (5) coating materials should be non-toxic, non-flammable, explosive materials, convenient storage and transportation, do not pollute the surrounding environment.
Processing technology requirements In order to ensure the promotion and application of surface protection technology, processing technology must be: (1) the process is simple, can be mastered by different levels of operator; (2) processing tools used in (tools) should be in the market (3) the process should not be affected by the season and the surrounding environment, to ensure that the pump station in winter and spring maintenance of the pump station in the maintenance of the pump station in the winter and spring, Can be carried out; (4) coating does not require special insulation maintenance, coating can be quickly cured or put into use to shorten the repair period.
Advances in Spraying Technology of Alloy Powder:
Spray welding protection technology with the development of low-melting point powder material in the successful spraying and surfacing developed on the basis of a metal surface protection technology. As the spray layer through the remelting process, the coating is dense and non-porous, smooth surface, with saving material, good quality and high efficiency advantages, spray coating surface hardness up to HRC60-70, can be several times or even ten times longer Diving, pump flow parts of the service life.
Optimization of Spray Welding Alloy Powder Material:
Optimization points In order to ensure the quality of the spray coating to prevent the deformation of the workpiece and coating cracks, submersible pump coating materials to optimize the technical route: (1) through the ratio optimization, change the hardening phase of the particle size, quantity and crystallization Grain size, in order to obtain reasonable organizational structure and distribution of state. (2) According to the characteristics of submerged pump cavitation and abrasion, it can adjust the performance index of the material, not only to ensure the material excellent anti-abrasion, but also to inhibit or reduce the crack generation and improve the weldability. (3) to determine a reasonable technical parameters and process parameters, to improve the use of coating conditions under the binding state.
Metal coating research:
In the submersible pump anti-wear surface protection technology is also widely used in metal surface protective layer. The most used is the electrode welding and wire coating. The use of stainless steel electrode welding method can ensure that the welding layer and the substrate has a high bond strength, but the surfacing welding dilution rate, welding layer thickness and uneven processing allowance, the work of the matrix material solderability requirements . Submersible pump surface treatment by surfacing, generally in the surfacing did not occur before the cavitation damage, in the welding spot around the rapid occurrence of new cavitation damage, until the bottom layer of surfacing. Wire spray coating formed by the stainless steel spray particles to the mechanical combination of the main, not suitable for submersible pumps impact load and anti-cavitation repair. For some large submersible pump workpieces, such as large diameter (diameter 3 meters above) axial flow impeller chamber, can be embedded in the surface layer of stainless steel plate to increase the anti-erosion ability. However, this method requires the workpiece sent to a large submersible pump factory specialized processing, turning, mosaic, welding, expensive, long cycle, non-general submersible pump station can be implemented. Alloy powder coating is developed on the basis of wire coating. Compared with the welding method, forming beautiful and smooth, easy to control the thickness, dilution rate is small, the method is simple, easy to get heat, processing from the climate, site constraints. However, since the sprayed layer is formed by superimposing the alloy powder particles in a semi-molten state at a high speed on the surface of the substrate in a layer-by-layer manner, it belongs to a layered structure, and its physical properties have directivity, and during the spraying process, Powder particles are the occurrence of condensation, shrinkage, deformation and other phenomena in the coating development of an internal stress, so the alloy powder coating is generally only used for cavitation and abrasion less serious surface protection of small and medium submersible pumps.
Surface protection materials and process requirements:
(2) has a toughness to absorb the impact energy; (3) has a very high strength and hardness to resist cavitation, erosion damage; (2) has a toughness to absorb impact energy; To ensure that the coating in the pump 30-35 m per second under the impact of high-speed water will not be peeling off; (4) coating materials must be affordable to ensure that the large and medium-sized submersible pumping stations and a wide range (5) coating materials should be non-toxic, non-flammable, explosive materials, convenient storage and transportation, do not pollute the surrounding environment.
Processing technology requirements In order to ensure the promotion and application of surface protection technology, processing technology must be: (1) the process is simple, can be mastered by different levels of operator; (2) processing tools used in (tools) should be in the market (3) the process should not be affected by the season and the surrounding environment, to ensure that the pump station in winter and spring maintenance of the pump station in the maintenance of the pump station in the winter and spring, Can be carried out; (4) coating does not require special insulation maintenance, coating can be quickly cured or put into use to shorten the repair period.
Advances in Spraying Technology of Alloy Powder:
Spray welding protection technology with the development of low-melting point powder material in the successful spraying and surfacing developed on the basis of a metal surface protection technology. As the spray layer through the remelting process, the coating is dense and non-porous, smooth surface, with saving material, good quality and high efficiency advantages, spray coating surface hardness up to HRC60-70, can be several times or even ten times longer Diving, pump flow parts of the service life.
Optimization of Spray Welding Alloy Powder Material:
Optimization points In order to ensure the quality of the spray coating to prevent the deformation of the workpiece and coating cracks, submersible pump coating materials to optimize the technical route: (1) through the ratio optimization, change the hardening phase of the particle size, quantity and crystallization Grain size, in order to obtain reasonable organizational structure and distribution of state. (2) According to the characteristics of submerged pump cavitation and abrasion, it can adjust the performance index of the material, not only to ensure the material excellent anti-abrasion, but also to inhibit or reduce the crack generation and improve the weldability. (3) to determine a reasonable technical parameters and process parameters, to improve the use of coating conditions under the binding state.
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