A sewage pump impeller surface enamel treatment technology and method

Abstract

The present invention discloses a sewage pump impeller surface enamel treatment technology and method, including an impeller, the impeller is movably connected to a process short shaft through a process nut, the impeller is provided with impeller blades inside, the outer side of the impeller is provided with an impeller outer surface enamel layer, the impeller is provided with an impeller flow channel inside, the inner side of the impeller flow channel is provided with an impeller inner surface enamel layer, the side surface of the impeller blade is provided with a blade surface enamel layer, the impeller blade is installed inside the impeller flow channel, S1, annealing the cast finished impeller to eliminate the casting stress of the impeller, remove graphite, and decarburize the surface, the annealing temperature is controlled at 750-800℃, and the annealing time is 10-30 minutes; S2, placing the annealed impeller in a shot blasting machine for surface shot blasting. Through the above structure, the impeller surface smoothness is improved, the pumping efficiency is improved, and the wear resistance and corrosion resistance of the impeller are increased.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment manufacturing, and in particular to a sewage pump impeller surface enamel treatment technology and method. Background Art

[0002] As a hydraulic lifting machine, water pumps are widely used in industrial and agricultural production, as well as in the daily production and life of the general public. Sewage pumps are mainly used to transport industrial wastewater from mining, petroleum, chemical, pharmaceutical, papermaking, power plants, and other industries, as well as for urban domestic sewage, municipal engineering, and public facilities. They mainly transport sewage containing certain particles and corrosive wastewater.

[0003] The sewage pump impeller is the core component of the water pump and also the main vulnerable part. Its design and manufacturing process directly determine the working efficiency, liquid flow performance and service life of the sewage pump.

[0004] At present, the design of sewage pump impellers mainly adopts large flow channel and anti-clogging hydraulic design theory, and the technology is very mature.

[0005] The sewage pump impeller is mainly manufactured by casting process, and the material is generally gray cast iron (it can also be produced by casting steel and cast stainless steel).

[0006] Pain points and defects in the manufacture and use of existing sewage pump impellers:

[0007] ① Since the impeller is generally manufactured by casting technology, the surface of the impeller flow channel is relatively rough, and the working efficiency of the water pump is difficult to guarantee.

[0008] ② Due to the rough surface of the impeller flow channel, the performance of sewage and dirt passing through is not very good.

[0009] ③ Since the liquid transported by the sewage pump generally has certain acid and alkali corrosiveness, the material of the impeller is generally gray cast iron, which has poor corrosion resistance. The impeller is easily corroded and damaged, so the service life of the impeller is relatively short.

[0010] ④ Since the transported sewage contains a certain amount of particles, the impeller flow channel is prone to wear.

[0011] ⑤Replacing the water pump impeller will affect normal production and use and increase maintenance costs.

[0012] Therefore, a sewage pump impeller surface enamel treatment technology and method are proposed to solve the above problems. Summary of the Invention

[0013] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a sewage pump impeller surface enamel treatment technology and method, which can improve the impeller surface smoothness, improve the pumping efficiency, and increase the impeller's wear resistance and corrosion resistance.

[0014] The present invention also provides a sewage pump impeller surface enamel treatment device having the above-mentioned type, including an impeller, the impeller being movably connected to a process short shaft through a process nut, the impeller being provided with impeller blades inside, the impeller being provided with an impeller outer surface enamel layer on the outer side surface, the impeller being provided with an impeller flow channel inside, the impeller being provided with an impeller inner surface enamel layer on the inner side surface, and the side surfaces of the impeller blades being provided with a blade surface enamel layer.

[0015] According to the sewage pump impeller surface enamel treatment technology, the impeller blades are installed inside the impeller flow channel.

[0016] A method for treating the surface of a sewage pump impeller with enamel, comprising the following steps:

[0017] S1. Anneal the finished impeller to eliminate the casting stress of the impeller, remove graphite and decarburize the surface. The annealing temperature is controlled at 750-800℃ and the annealing time is 10-30 minutes.

[0018] S2. Place the annealed impeller into a shot blasting machine for surface shot blasting treatment;

[0019] S3. Carefully inspect the impeller flow channel after the surface shot blasting treatment, and use appropriate grinding tools to grind away the burrs, sand sticking, protrusions and other defects that have not been removed;

[0020] S4. Cut the outer surface, shaft hole and end face of the pre-processed impeller according to the drawing dimensions, and leave a finishing allowance of 0.5mm for the shaft hole to insert the keyway;

[0021] S5. Perform static balance test on the impeller after cutting;

[0022] S6. Install the impeller that has passed the static balance test onto the process short shaft, install the process nut and tighten it;

[0023] S7, base glaze spraying: adopt wet enamel method;

[0024] (1) Select the base glaze suitable for cast iron enamel, prepare the selected base glaze material according to the process formula ratio and stir it thoroughly;

[0025] (2) Place the impeller and the process short shaft horizontally downward, spray the inner surface of the impeller flow channel with the prepared base glaze slurry first, and then spray the outer surface of the impeller. Try to spray continuously to ensure uniform coating. The base glaze thickness is controlled at 0.08-0.12mm;

[0026] (3) Place the sprayed impeller in a drying oven for drying. The drying temperature is controlled at 200-260°C and the drying time is controlled at 25-40 minutes.

[0027] (4) Carefully check the impeller after drying. For any missed spraying or damaged powder layer, re-spray or apply primer with a brush. After small area repairs, dry again.

[0028] (5) Place the repaired and dried impeller into the firing furnace for firing. The firing temperature is controlled at 760-780℃ and the firing time is controlled at 12-16 minutes.

[0029] S8, glaze spraying:

[0030] (1) Check the quality of the bottom glaze layer of the impeller after firing. Use appropriate hand-grinding tools to manually polish the bottom glaze particles, protrusions, and powder stems caused by splashing and flowing;

[0031] (2) For bubbles and pinholes produced by firing the base glaze, they should be smoothed with hand-grinding tools and then filled with semi-dry base glaze;

[0032] (3) Use a sponge dipped in water to wet the bottom glaze layer of the impeller that has passed the inspection. The dry bottom glaze layer will change color when it comes into contact with water. When wetting the water, be careful to avoid the raw bottom glaze applied during the previous repair.

[0033] (4) Select the glaze suitable for cast iron enamel, adjust the selected glaze installation process formula ratio and stir evenly;

[0034] (5) Spray the top glaze on the impeller after the bottom glaze has been processed. The top glaze should be sprayed evenly with a thickness of 0.12-0.18mm per spray.

[0035] (6) Dry the first layer of glaze on the sprayed impeller. The drying temperature is controlled at 180-230°C and the drying time is controlled at 25-40 minutes.

[0036] (7) Carefully check the impeller surface after glaze drying, repair and re-spray it, and then dry it;

[0037] (8) Place the dried impeller into a firing furnace for firing. The firing temperature is controlled at 720-760°C and the firing time is controlled at 12-16 minutes.

[0038] (9) After the glaze is fired, the impeller is inspected again. If the quality is qualified, the next process can be carried out. If there are defects, they must be repaired, re-sprayed, and fired.

[0039] S9. After the glaze is fired to a qualified impeller, remove the process nut and process short shaft, and perform fine processing on the shaft hole;

[0040] S10. Install the finely machined sewage pump impeller onto the sewage pump shaft head, and finally carry out factory testing on the water pump test bench.

[0041] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0043] Figure 1 This is a front cross-sectional view of a sewage pump surface enamel treatment technology of the present invention;

[0044] Figure 2 It is a left sectional view of a sewage pump surface enamel treatment technology of the present invention.

[0045] Legend:

[0046] 1. Impeller; 2. Process nut; 3. Enamel layer on the outer surface of the impeller; 4. Enamel layer on the inner surface of the impeller; 5. Impeller flow channel; 6. Process short shaft; 7. Impeller blades; 8. Enamel layer on the blade surface. DETAILED DESCRIPTION

[0047] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0048] Reference Figure 1-2 An embodiment of the present invention provides a sewage pump impeller surface enamel treatment device, which includes an impeller 1, which is movably connected to a process short shaft 6 through a process nut 2, and an impeller blade 7 is arranged inside the impeller 1, and the impeller blade 7 is installed inside the impeller flow channel 5.

[0049] The outer side of the impeller 1 is provided with an impeller outer surface enamel layer 3, the interior of the impeller 1 is provided with an impeller flow channel 5, the inner side of the impeller flow channel 5 is provided with an impeller inner surface enamel layer, and the side surface of the impeller blade 7 is provided with a blade surface enamel layer 8.

[0050] A method for treating the surface of a sewage pump impeller with enamel, comprising the following steps:

[0051] S1. Annealing the finished impeller 1 to eliminate casting stress, remove graphite, and decarburize the surface. The annealing temperature is controlled at 750-800° C. and the annealing time is 10-30 minutes.

[0052] S2, placing the annealed impeller 1 into a shot blasting machine for surface shot blasting;

[0053] S3. Carefully inspect the impeller flow channel 5 after the surface shot blasting treatment, and use appropriate grinding tools to grind away the burrs, sand sticking, protrusions and other defects that have not been removed;

[0054] S4. Cut the outer surface, shaft hole and end face of the pre-processed impeller 1 according to the dimensions in the drawing, leaving a finishing allowance of 0.5mm for the shaft hole, and insert the keyway;

[0055] S5. Perform static balance test on the impeller 1 after cutting.

[0056] S6. Install the statically balanced impeller 1 onto the process short shaft 6, and tighten the process nut 2;

[0057] S7, base glaze spraying: adopt wet enamel method;

[0058] 1. Select a base glaze suitable for cast iron enamel, which has good wettability to the cast iron body, good dissolution of iron oxide, a wide firing temperature, sufficient adhesion strength, and appropriate elasticity. Prepare the selected base glaze material according to the process formula ratio and stir it thoroughly;

[0059] 2. Place the impeller 1 with the process short shaft 6 facing downwards and horizontally, spray the inner surface of the impeller flow channel 5 with the prepared base glaze slurry first, using a pressure tank to supply glaze slurry equipment for spraying, and then spray the outer surface of the impeller 1. Try to spray continuously to ensure uniform coating. The base glaze thickness should be controlled at 0.08-0.12mm. Use your fingers to smooth out the glaze powder protrusions caused by dripping or splashing glaze slurry and the powder stems accumulated at the edges and corners;

[0060] 3. Place the sprayed impeller 1 into a drying oven for drying. The drying temperature is controlled at 200-260°C and the drying time is controlled at 25-40 minutes.

[0061] 4. Carefully check the impeller 1 after drying. For any missed spraying or damaged powder layer, re-spray or apply primer with a brush. After small area repairs, dry again.

[0062] 5. Place the repaired and dried impeller 1 into a firing furnace for firing. The firing temperature is controlled at 760-780°C and the firing time is controlled at 12-16 minutes.

[0063] S8, glaze spraying:

[0064] 1. Check the quality of the bottom glaze layer of the impeller 1 after firing. Use appropriate hand-grinding tools to manually polish the bottom glaze particles, protrusions, and powder stems caused by splashing and flowing;

[0065] 2. For bubbles and pinholes produced by firing the base glaze, use hand-grinding tools to smooth them out and then fill them with semi-dry base glaze;

[0066] 3. For the impeller 1 with the qualified bottom glaze blank, use a sponge dipped in water to wet the bottom glaze layer. The dry bottom glaze layer will change color when it comes into contact with water. When wetting with water, be careful to avoid the raw bottom glaze applied during the previous repair.

[0067] 4. Choose a glaze suitable for cast iron enamel. The glaze should have certain acid and alkali resistance, appropriate softening temperature and surface tension, good wear resistance, good surface gloss and hiding power. Prepare the selected glaze installation process formula in the right proportion and stir evenly.

[0068] 5. Spray the top glaze on the impeller 1 after the base glaze has been processed. The top glaze should be sprayed evenly with a thickness of 0.12-0.18mm per spray. When spraying, refer to the spraying order of the base glaze to avoid over-spraying and missing spraying.

[0069] 6. Dry the first layer of glaze on the sprayed impeller 1. Pay attention to the thorough drying. The drying temperature should be controlled at 180-230℃ and the drying time should be controlled at 25-40 minutes.

[0070] 7. Carefully check the surface of the impeller 1 after the glaze is dried, repair it, re-spray it, and then dry it;

[0071] 8. Place the dried impeller 1 into a sintering furnace for sintering. The sintering temperature is controlled at 720-760°C and the sintering time is controlled at 12-16 minutes.

[0072] 9. After the glaze is fired, the impeller 1 is inspected again. If the quality is qualified, the next process can be carried out. If there are defects, they must be repaired, re-sprayed, and fired.

[0073] S9, after the surface glaze is fired to a qualified impeller 1, the process nut 2 and the process short shaft 6 are removed, and the shaft hole is finely machined;

[0074] S10. Install the finely machined sewage pump impeller 1 onto the sewage pump shaft head, and finally carry out factory testing on the water pump test bench.

[0075] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the scope of the present invention.

Claims

1. A method for treating the surface of a sewage pump impeller with enamel, characterized in that: The impeller (1) comprises an impeller (1), wherein the impeller (1) is movably connected to a process short shaft (6) via a process nut (2), and impeller blades (7) are arranged inside the impeller (1); The outer side surface of the impeller (1) is provided with an impeller outer surface enamel layer (3), the interior of the impeller (1) is provided with an impeller flow channel (5), the inner side surface of the impeller flow channel (5) is provided with an impeller inner surface enamel layer, and the side surface of the impeller blade (7) is provided with a blade surface enamel layer (8); The sewage pump impeller surface enamel treatment method comprises the following steps: S1. Annealing the finished impeller (1) to eliminate the casting stress of the impeller (1), remove graphite, and decarburize the surface. The annealing temperature is controlled at 750-800° C. and the annealing time is 10-30 minutes. S2, placing the annealed impeller (1) into a shot blasting machine for surface shot blasting treatment; S3. Carefully inspect the impeller flow passage (5) after the surface shot blasting treatment, and select appropriate grinding tools to grind the burrs, sand sticking and protrusion defects that have not been processed; S4. Cut the outer surface, shaft hole and end face of the pre-processed impeller (1) according to the dimensions in the drawing, leaving a finishing allowance of 0.5 mm for the shaft hole, and insert the keyway; S5. Perform static balance test on the impeller (1) after cutting; S6. Install the statically balanced impeller (1) onto the process stub shaft (6), and tighten the process nut (2); S7, base glaze spraying: adopt wet enamel method; (1) Select the base glaze suitable for cast iron enamel, prepare the selected base glaze material according to the process formula ratio and stir it thoroughly; (2) Place the impeller (1) and the process short shaft (6) horizontally downward, spray the inner surface of the impeller flow channel (5) with the prepared base glaze slurry, and then spray the outer surface of the impeller (1). Try to spray continuously to ensure uniform coating. The base glaze thickness is controlled at 0.08-0.12mm; (3) Place the sprayed impeller (1) in a drying oven for drying. The drying temperature is controlled at 200-260°C and the drying time is controlled at 25-40 minutes. (4) Carefully check the impeller (1) after drying. For any missed spraying or damaged powder layer, re-spray or apply primer with a brush. After small area repairs, dry again. (5) Place the repaired and dried impeller (1) into a firing furnace for firing. The firing temperature is controlled at 760-780°C and the firing time is controlled at 12-16 minutes. S8, glaze spraying: (1) Check the quality of the bottom glaze layer of the impeller (1) after firing. The bottom glaze particles, protrusions and powder stems caused by splashing and flowing should be manually polished with appropriate hand-grinding tools; (2) For bubbles and pinholes produced by firing the base glaze, they should be smoothed with hand-grinding tools and then filled with semi-dry base glaze; (3) The bottom glaze impeller (1) that has passed the inspection should be wetted with a sponge dipped in water. The dry bottom glaze layer will change color when it comes into contact with water. When wetting the water, be careful to avoid the raw bottom glaze applied during the previous repair. (4) Select the glaze suitable for cast iron enamel, adjust the selected glaze installation process formula ratio and stir evenly; (5) Apply top glaze to the impeller (1) after the bottom glaze has been processed. The top glaze should be sprayed evenly with a thickness of 0.12-0.18 mm per spray. (6) Dry the first layer of glaze on the sprayed impeller (1), control the drying temperature at 180-230°C, and the drying time at 25-40 minutes; (7) Carefully inspect the surface of the impeller (1) after glaze drying, repair it, re-spray it, and then dry it; (8) Place the dried impeller (1) into a firing furnace for firing, control the firing temperature at 720-760°C, and control the firing time at 12-16 minutes; (9) After the glaze is fired, the impeller (1) is inspected again. If the quality is qualified, the next process can be carried out. If there are defects, they must be repaired, re-sprayed, and fired; S9, after the surface glaze is fired to a qualified impeller (1), the process nut (2) and the process short shaft (6) are removed, and the shaft hole is finely processed; S10, install the finely machined sewage pump impeller (1) onto the sewage pump shaft head, and finally carry out factory testing on the water pump test bench.

2. A sewage pump impeller surface enamel treatment method according to claim 1, characterized in that: The impeller blades (7) are installed inside the impeller flow channel (5).

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