A vacuum pump energy-saving rotor processing technology

Abstract

The present invention relates to the technical field of vacuum pump rotor production, specifically a vacuum pump energy-saving rotor processing technology; the present invention prepares a coating, uniformly applies the prepared coating to the surface of the cavity, grinds and polishes it after drying, then melts the rotor raw material in the form of hot melt, and then places it in the cavity for casting and molding, takes it out after cooling, grinds and polishes it again to obtain a blank, and finally heat-treats the obtained blank and cools it to complete the processing of the vacuum pump rotor, wherein the coating is prepared with composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol as raw materials. The vacuum pump energy-saving rotor processing technology provided by the present invention can not only improve the mechanical properties of the vacuum pump energy-saving rotor, but also has excellent surface defect elimination performance, effectively ensuring its quality and quality.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum pump rotor production, and in particular to a vacuum pump energy-saving rotor processing technology. Background Art

[0002] A vacuum pump is a device or equipment that creates a vacuum by evacuating a container using mechanical, physical, chemical, or physicochemical methods. In simple terms, a vacuum pump is a device that uses various methods to improve, create, and maintain a vacuum in a closed space. Screw vacuum pumps have a simple structure and are widely used in the chemical, pharmaceutical, petrochemical, electronics, and nuclear power industries. The vacuum pump rotor is the core component of the pump, and its reliability directly affects its service life.

[0003] In the patent document with application number "CN202211692454.0" and titled "A Casting Process for a Dry Screw Vacuum Pump Rotor", it is recorded that "the present invention uses a coating to coat the cavity, including the following steps: 1) the coating is evenly coated on the cavity, dried, and polished with 80-140 mesh coarse sandpaper; 2) the coating in step 1) is added with 1-2 times its volume of a volatile solvent, evenly coated on the cavity, dried, and polished with 400-800 mesh sandpaper; 3) the coating in step 1) is added with 2-4 times its volume of a volatile solvent, evenly coated on the cavity, dried, and polished with 1000-1200 mesh sandpaper; it can significantly improve the surface quality of the casting."

[0004] While the vacuum pump rotor casting process provided by the aforementioned patent document has certain advantages, such as improving surface defects, its inherent mechanical properties are relatively insufficient and still require further improvement. Based on this, the present invention provides a vacuum pump rotor energy-saving processing technology to address the aforementioned technical issues. Summary of the Invention

[0005] The purpose of the present invention is to provide a vacuum pump energy-saving rotor processing technology. The provided vacuum pump energy-saving rotor processing technology can not only improve the mechanical properties of the vacuum pump energy-saving rotor, but also has excellent surface defect elimination performance, effectively ensuring its quality.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a vacuum pump energy-saving rotor processing process, comprising the following steps:

[0008] S1. Prepare the coating, apply the prepared coating evenly on the surface of the cavity, and after drying, polish it with 1000-1200 mesh sandpaper;

[0009] S2. Melting the rotor raw material by hot melting, then placing it in the mold cavity for casting, taking it out after cooling, and polishing it again with 1000-1200 mesh sandpaper to obtain a blank;

[0010] S3. After the obtained blank is heat-treated and cooled, the processing of the vacuum pump rotor is completed.

[0011] The present invention is further configured as follows: in step S1, the coating is made of the following raw materials in parts by weight: 20 to 30 parts of a composite base material, 8 to 12 parts of aggregate, 4 to 8 parts of ethyl cellulose, 2 to 4 parts of dodecylphenol polyoxyethylene ether, and 25 to 35 parts of ethanol;

[0012] The preparation process of the coating is as follows:

[0013] Accurately weigh the composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol, place the composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol in a mixing device, and mix them at 30-40°C and 220-320 r / min for 20-30 minutes;

[0014] After the mixing is completed, the obtained material is ball-milled in a ball mill for 1 to 3 hours to obtain a coating.

[0015] The present invention is further configured as follows: the composite base material is formed by mixing polyvinyl butyral and furan resin in a mass ratio of 1:0.08-0.14.

[0016] The present invention is further configured as follows: the aggregate is formed by mixing talc powder and modified bentonite in a mass ratio of 1:0.22-0.32.

[0017] The present invention is further configured as follows: the preparation process of the modified bentonite is as follows:

[0018] Ultrasonic dispersion of bentonite in an appropriate amount of deionized water at a solid-liquid ratio of 0.12-0.24 g / mL for 20-30 minutes, then adding auxiliary materials at 4.8-5.2% of the bentonite mass, treating at 340-440 r / min for 30-40 minutes, and sealing and standing for 36-40 hours;

[0019] After standing, add 65-75% ethanol of the volume of deionized water, continue to treat at 340-440 r / min for 20-30 minutes, filter, and dry at 70-80° C. for 8-10 hours to obtain modified bentonite.

[0020] The present invention is further configured as follows: the auxiliary material is selected from any one of lithium carbonate and lithium nitrate.

[0021] The present invention is further configured as follows: the weight ratio of the grinding balls of the ball mill to the material is 8-16:1, and the ball mill rotation speed is 50-80 r / min.

[0022] The present invention is further configured as follows: in step S3, the heat treatment process is as follows:

[0023] The first stage: heating the obtained blank to 550-560°C and keeping the temperature for 240-260 minutes;

[0024] The second stage: cool down to 500-510℃ and keep warm for 100-120min;

[0025] The third stage: Then cool to room temperature to complete the heat treatment of the blank.

[0026] The present invention is further configured as follows: the heating rate in the first stage is 10-14°C / min, the cooling rate in the second stage is 1-3°C / min, and the cooling in the third stage is natural cooling.

[0027] The present invention is further configured as follows: in the step S3, the step further includes grinding and polishing the obtained blank with 1000-1200 mesh sandpaper after the blank is heat-treated and cooled.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention prepares a coating, uniformly applies the prepared coating to the surface of the cavity, grinds and polishes it after drying, melts the rotor raw material in the form of hot melt, then places it in the cavity for casting, takes it out after cooling, grinds and polishes it again to obtain a blank, and finally heat treats the obtained blank and cools it to complete the processing of the vacuum pump rotor, wherein the coating is prepared with composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol as raw materials. The vacuum pump energy-saving rotor processing technology provided by the present invention can not only improve the mechanical properties of the vacuum pump energy-saving rotor, but also has excellent surface defect elimination performance, effectively ensuring its quality and quality. The vacuum pump energy-saving rotor processing technology provided by the present invention has a broader market prospect and is more suitable for promotion. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] This embodiment provides a vacuum pump energy-saving rotor processing process, including the following steps:

[0033] S1. Prepare the coating, apply the prepared coating evenly on the surface of the cavity, and after drying, polish it with 100-mesh sandpaper.

[0034] The coating is made of the following raw materials in parts by weight: 20 parts of composite base material, 8 parts of aggregate, 4 parts of ethyl cellulose, 2 parts of dodecylphenol polyoxyethylene ether and 25 parts of ethanol;

[0035] Furthermore, the coating preparation process is as follows:

[0036] Accurately weigh the composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol, place the composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol in a mixing device, and mix them at 30°C and 220 r / min for 20 minutes;

[0037] After mixing, the obtained material is ball-milled in a ball mill for 1 hour to obtain a coating.

[0038] Furthermore, the composite base material is prepared by mixing polyvinyl butyral and furan resin in a mass ratio of 1:0.08.

[0039] In this embodiment, it should be noted that polyvinyl butyral was purchased from Jinan Shuangying Chemical Co., Ltd., and furan resin was purchased from Shandong Duoju Chemical Co., Ltd.

[0040] The aggregate is made of talc and modified bentonite in a mass ratio of 1:0.22.

[0041] Furthermore, the preparation process of modified bentonite is as follows:

[0042] Bentonite was ultrasonically dispersed in an appropriate amount of deionized water at a solid-liquid ratio of 0.12 g / mL for 20 minutes, and then 4.8% of the bentonite weight of the auxiliary material was added thereto. The mixture was treated at 340 r / min for 30 minutes and then sealed and allowed to stand for 36 hours.

[0043] After standing, 65% ethanol by volume of deionized water was added thereto, and the mixture was treated at 340 r / min for 20 min. After filtration, the mixture was dried at 70° C. for 8 h to obtain modified bentonite.

[0044] Among them, lithium carbonate is selected as the auxiliary material.

[0045] In this embodiment, it should be noted that talc was purchased from Henan Xinzhiyuan Chemical Products Co., Ltd., and bentonite was purchased from DKSH Chemical International Trading (Shanghai) Co., Ltd.

[0046] In addition, the weight ratio of the ball mill to the material is 8:1, and the ball mill speed is 50 r / min.

[0047] S2. Melt the rotor raw material by hot melting, then place it in the mold cavity for casting, take it out after cooling, and polish it again with 1000-grit sandpaper to obtain a blank.

[0048] In this embodiment, the rotor material is iron.

[0049] S3. After the obtained blank is heat-treated and cooled, the processing of the vacuum pump rotor is completed.

[0050] The heat treatment process is as follows:

[0051] The first stage: the obtained blank is heated to 550℃ and kept at this temperature for 240min;

[0052] The second stage: cool down to 500℃ and keep warm for 100min;

[0053] The third stage: Then cool to room temperature to complete the heat treatment of the blank.

[0054] Furthermore, the heating rate in the first stage is 10° C. / min, the cooling rate in the second stage is 1° C. / min, and the cooling in the third stage is natural cooling.

[0055] In addition, the method further includes grinding and polishing the obtained blank with 1000-1200 mesh sandpaper after cooling the blank through heat treatment.

[0056] Example 2

[0057] This embodiment provides a vacuum pump energy-saving rotor processing process, including the following steps:

[0058] S1. Prepare the coating, apply the prepared coating evenly on the surface of the cavity, and after drying, polish it with 1000-1200 mesh sandpaper.

[0059] The coating is made of the following raw materials in parts by weight: 25 parts of composite base material, 10 parts of aggregate, 6 parts of ethyl cellulose, 3 parts of dodecylphenol polyoxyethylene ether and 30 parts of ethanol;

[0060] Furthermore, the coating preparation process is as follows:

[0061] Accurately weigh the composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol, place the composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol in a mixing device, and mix them at 35°C and 270 r / min for 25 minutes;

[0062] After mixing, the obtained material is ball-milled in a ball mill for 2 hours to obtain a coating.

[0063] Furthermore, the composite base material is prepared by mixing polyvinyl butyral and furan resin in a mass ratio of 1:0.11.

[0064] In this embodiment, it should be noted that polyvinyl butyral was purchased from Jinan Shuangying Chemical Co., Ltd., and furan resin was purchased from Shandong Duoju Chemical Co., Ltd.

[0065] The aggregate is made of talc and modified bentonite in a mass ratio of 1:0.27.

[0066] Furthermore, the preparation process of modified bentonite is as follows:

[0067] Bentonite was ultrasonically dispersed in an appropriate amount of deionized water at a solid-liquid ratio of 0.18 g / mL for 25 minutes, and then 5% of the bentonite weight of the auxiliary material was added thereto. The mixture was treated at 390 r / min for 35 minutes and then sealed and allowed to stand for 38 hours.

[0068] After standing, 70% ethanol by volume of deionized water was added thereto, and the mixture was treated at 390 r / min for 25 min. After filtration, the mixture was dried at 75° C. for 9 h to obtain modified bentonite.

[0069] Among them, lithium nitrate is selected as the auxiliary material.

[0070] In this embodiment, it should be noted that talc was purchased from Henan Xinzhiyuan Chemical Products Co., Ltd., and bentonite was purchased from DKSH Chemical International Trading (Shanghai) Co., Ltd.

[0071] In addition, the weight ratio of the ball mill to the material is 12:1, and the ball mill speed is 75 r / min.

[0072] S2. Melt the rotor raw material by hot melting, then place it in the mold cavity for casting, take it out after cooling, and polish it again with 1100-mesh sandpaper to obtain a blank.

[0073] In this embodiment, the rotor material is iron.

[0074] S3. After the obtained blank is heat-treated and cooled, the processing of the vacuum pump rotor is completed.

[0075] The heat treatment process is as follows:

[0076] The first stage: the obtained blank is heated to 555℃ and kept at this temperature for 250min;

[0077] The second stage: cool down to 505℃ and keep warm for 110min;

[0078] The third stage: Then cool to room temperature to complete the heat treatment of the blank.

[0079] Furthermore, the heating rate in the first stage is 12° C. / min, the cooling rate in the second stage is 12° C. / min, and the cooling in the third stage is natural cooling.

[0080] In addition, the method further includes polishing the blank with 1100-grit sandpaper after cooling the blank.

[0081] Example 3

[0082] This embodiment provides a vacuum pump energy-saving rotor processing process, including the following steps:

[0083] S1. Prepare the coating, apply the prepared coating evenly on the surface of the cavity, and after drying, polish it with 1200-grit sandpaper.

[0084] The coating is made of the following raw materials in parts by weight: 30 parts of composite base material, 12 parts of aggregate, 8 parts of ethyl cellulose, 4 parts of dodecylphenol polyoxyethylene ether and 35 parts of ethanol;

[0085] Furthermore, the coating preparation process is as follows:

[0086] Accurately weigh the composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol, place the composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol in a mixing device, and mix them at 40°C and 320 r / min for 30 minutes;

[0087] After mixing, the obtained material is ball-milled in a ball mill for 3 hours to obtain a coating.

[0088] Furthermore, the composite base material is prepared by mixing polyvinyl butyral and furan resin in a mass ratio of 1:0.14.

[0089] In this embodiment, it should be noted that polyvinyl butyral was purchased from Jinan Shuangying Chemical Co., Ltd., and furan resin was purchased from Shandong Duoju Chemical Co., Ltd.

[0090] The aggregate is made of talc and modified bentonite in a mass ratio of 1:0.32.

[0091] Furthermore, the preparation process of modified bentonite is as follows:

[0092] Bentonite was ultrasonically dispersed in an appropriate amount of deionized water at a solid-liquid ratio of 0.24 g / mL for 30 minutes, and then 5.2% of the bentonite mass of the auxiliary material was added thereto. The mixture was treated at 440 r / min for 40 minutes and then sealed and allowed to stand for 40 hours.

[0093] After standing, 75% ethanol by volume of deionized water was added thereto, and the mixture was treated at 440 r / min for 30 min. After filtration, the mixture was dried at 80° C. for 10 h to obtain modified bentonite.

[0094] Among them, lithium carbonate is selected as the auxiliary material.

[0095] In this embodiment, it should be noted that talc was purchased from Henan Xinzhiyuan Chemical Products Co., Ltd., and bentonite was purchased from DKSH Chemical International Trading (Shanghai) Co., Ltd.

[0096] In addition, the weight ratio of the ball mill to the material is 16:1, and the ball mill speed is 80 r / min.

[0097] S2. Melt the rotor raw material by hot melting, then place it in the mold cavity for casting, take it out after cooling, and polish it again with 1200-mesh sandpaper to obtain a blank.

[0098] In this embodiment, the rotor material is iron.

[0099] S3. After the obtained blank is heat-treated and cooled, the processing of the vacuum pump rotor is completed.

[0100] The heat treatment process is as follows:

[0101] The first stage: the obtained blank is heated to 560℃ and kept at this temperature for 260min;

[0102] The second stage: cool down to 510℃ and keep warm for 120min;

[0103] The third stage: Then cool to room temperature to complete the heat treatment of the blank.

[0104] Furthermore, the heating rate in the first stage is 14° C. / min, the cooling rate in the second stage is 3° C. / min, and the cooling in the third stage is natural cooling.

[0105] In addition, the method further includes polishing the blank with 1200-grit sandpaper after cooling the blank.

[0106] Comparative Example 1: The difference from Example 1 is that no coating is used in this example.

[0107] Comparative Example 2: The difference from Example 1 is that no heat treatment is used in this example.

[0108] Performance test: The energy-saving rotor samples of the vacuum pumps provided in Examples 1 to 3 and Comparative Examples 1 to 2 are marked as Examples 1 to 3 and Comparative Examples 1 to 2, respectively; and the relevant performance of the energy-saving rotors of the vacuum pumps provided in Examples 1 to 3 and Comparative Examples 1 to 2 are tested as follows:

[0109] 1. Surface defect test: The test method is that 10 people use their naked eyes to observe the rotor surface at a 45° angle to the light to evaluate the surface flatness of each rotor. The evaluation results are scored as 3, 2, 1 and 0 to obtain the final total score.

[0110] 2. Compressive strength test: The test method is GB / T13822-1992.

[0111] 3. Elongation test: The samples were tested according to ASTM B577-2019.

[0112] The obtained test data are recorded in Table 1 and Table 2 below:

[0113] Table 1 Surface defect test results of each group of vacuum pump energy-saving rotors

[0114] Group Score Example 1 group 29 Example 2 group 27 Example 3 group 27 Comparison group 1 8 Comparison of 2 groups 16

[0115] Table 2 Mechanical properties test results of each group of vacuum pump energy-saving rotors

[0116] Group Tensile strength (MPa) Elongation (%) Example 1 group 665 24 Example 2 group 662 23 Example 3 group 666 24 Comparison group 1 655 21 Comparison of 2 groups 568 15

[0117] Comparing and analyzing the relevant data in Tables 1 and 2 shows that the processing technology for energy-saving vacuum pump rotors provided by the present invention not only improves the mechanical properties of energy-saving vacuum pump rotors but also effectively eliminates surface defects, effectively ensuring their quality. This demonstrates that the processing technology for energy-saving vacuum pump rotors provided by the present invention has a broader market prospect and is more suitable for promotion.

[0118] The present invention prepares a coating, uniformly applies the coating to the surface of a mold cavity, dries it, and polishes it. A rotor raw material is then melted by hot melting, then cast in the mold cavity, removed after cooling, and polished again to obtain a blank. Finally, the blank is heat-treated and cooled to complete the processing of the vacuum pump rotor. The coating is prepared using a composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether, and ethanol as raw materials. The provided vacuum pump energy-saving rotor processing process not only improves the mechanical properties of the vacuum pump energy-saving rotor, but also has excellent surface defect elimination performance.

[0119] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0120] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A vacuum pump energy-saving rotor processing technology, characterized in that: The following steps are involved: S1. Prepare the coating, apply the prepared coating evenly on the surface of the cavity, and after drying, polish it with 1000-1200 mesh sandpaper; S2. Melting the rotor raw material by hot melting, then placing it in the mold cavity for casting, taking it out after cooling, and polishing it again with 1000-1200 mesh sandpaper to obtain a blank; S3, heat-treating the obtained blank and cooling it to complete the processing of the vacuum pump rotor; The coating is made of the following raw materials in parts by weight: 20 to 30 parts of composite base material, 8 to 12 parts of aggregate, 4 to 8 parts of ethyl cellulose, 2 to 4 parts of dodecylphenol polyoxyethylene ether and 25 to 35 parts of ethanol; The preparation process of the coating is as follows: Accurately weigh the composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol, place the composite base material, aggregate, ethyl cellulose, dodecylphenol polyoxyethylene ether and ethanol in a mixing device, and mix them at 30-40°C and 220-320 r / min for 20-30 minutes; After the mixing is completed, the obtained material is ball-milled in a ball mill for 1 to 3 hours to obtain a coating; The composite base material is prepared by mixing polyvinyl butyral and furan resin in a mass ratio of 1:0.08-0.14; The aggregate is prepared by mixing talc powder and modified bentonite in a mass ratio of 1:0.22 to 0.32; The preparation process of the modified bentonite is as follows: Ultrasonic dispersion of bentonite in an appropriate amount of deionized water at a solid-liquid ratio of 0.12-0.24 g / mL for 20-30 minutes, then adding auxiliary materials at 4.8-5.2% of the bentonite mass, treating at 340-440 r / min for 30-40 minutes, and sealing and standing for 36-40 hours; After standing, add 65-75% ethanol of the volume of deionized water, continue to treat at 340-440 r / min for 20-30 minutes, filter, and dry at 70-80° C. for 8-10 hours to obtain modified bentonite.

2. A vacuum pump energy-saving rotor processing process according to claim 1, characterized in that: The auxiliary material is selected from any one of lithium carbonate and lithium nitrate.

3. A vacuum pump energy-saving rotor processing process according to claim 1, characterized in that: The weight ratio of the grinding balls of the ball mill to the material is 8-16:1, and the ball mill rotation speed is 50-80 r / min.

4. A vacuum pump energy-saving rotor processing process according to claim 1, characterized in that: In step S3, the heat treatment process is as follows: The first stage: heating the obtained blank to 550-560°C and keeping the temperature for 240-260 minutes; The second stage: cool down to 500-510℃ and keep warm for 100-120min; The third stage: Then cool to room temperature to complete the heat treatment of the blank.

5. A vacuum pump energy-saving rotor processing process according to claim 4, characterized in that: The heating rate in the first stage is 10-14°C / min, the cooling rate in the second stage is 1-3°C / min, and the cooling in the third stage is natural cooling.

6. A vacuum pump energy-saving rotor processing process according to claim 1, characterized in that: In the step S3, the method further includes grinding and polishing the blank with sandpaper of 1000-1200 mesh after the blank is heat-treated and cooled.