Ceramic pump production process

Abstract

The invention relates to a ceramic pump production technology which comprises the steps of manufacturing a metal pump shell, manufacturing a ceramic pump cover, manufacturing a ceramic pump body, assembling, grouting, final assembly and inspection and warehousing, and the ceramic pump body manufacturing procedure comprises the steps of preparing raw materials, grinding, storing slurry, feeding the slurry into a tank, feeding the slurry into a mold, maintaining pressure, demolding, fettling, airing, sintering and finish machining. The technology is relatively simple, the cost is low, the efficiency is high, and batch production of the ceramic centrifugal pump can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a ceramic pump production process, belonging to the technical field of ceramic centrifugal pump production. BACKGROUND

[0002] Centrifugal pump refers to the pump that relies on the centrifugal force generated by the rotation of the impeller to transport liquid. The traditional centrifugal pump is generally designed and manufactured with all-metal structure and is widely used in various industrial fields. Since the centrifugal pump with all-metal structure, the flow parts (front pump cover, impeller, pump body, and rear pump cover) are made of metal. The inner cavity of the pump body contains the impeller, which is the main flow part through which the liquid medium is pumped. When transporting liquid medium with strong corrosion or containing particles, it is easy to be corroded and worn, resulting in a significant reduction in service life.

[0003] The ceramic centrifugal pump forms a protective layer on the inner wall of the metal shell of the centrifugal pump by setting a layer of ceramic material on the inner wall of the pump body, including a ceramic pump body, a ceramic front pump cover, and a ceramic rear pump cover. The ceramic material has excellent corrosion resistance and wear resistance, which greatly improves the service life of the metal shell and further improves the working life of the centrifugal pump. At present, there are many process routes to form a ceramic layer in the metal shell of the centrifugal pump, but most of them have problems such as complex process route, multiple processes, high cost, and low efficiency, which cannot be mass-produced. SUMMARY

[0004] The purpose of the present application is to overcome the above-mentioned deficiencies and provide a ceramic pump production process with relatively simple process, low cost, and high efficiency, so as to realize the mass production of ceramic centrifugal pumps.

[0005] The purpose of the present application is achieved as follows: A ceramic pump production process, comprising the following steps: Step S1: making a metal pump shell; Step S2: making ceramic pump covers: making ceramic pump covers, including front pump covers and rear pump covers, by pressure casting or die casting; Step S3: making a ceramic pump body: S3.1: preparing raw materials: mixing clay, knot soil, kaolin, and water in proportion; S3.2: grinding: putting the prepared raw materials into a ball mill to grind into slurry; S3.3: slurry storage: after the slurry is ground, it is introduced into a storage tank for storage; S3.4: slurry into tank: introducing the completed slurry into a pressure tank body; S3.5: slurry into mold: injecting compressed gas into the pressure tank to increase the pressure in the tank, and relying on the pressure to press the slurry into the pump body mold to form a ceramic pump blank; the pump body mold comprises an upper mold and a lower mold; S3.6 Pressure maintaining: After the ceramic pump blank is formed in the pump body mold, the pressure is maintained continuously; S3.7 Molding: The ceramic pump blank is taken out of the mold; S3.8 Defect repairing: The defect position of the ceramic pump blank is repaired; S3.9 Drying: The ceramic pump blank after the repairing is placed in a cool place for drying; S3.10 Sintering: The ceramic pump blank after the drying, the front pump cover and the rear pump cover are placed in a heating furnace and heated to 1200-1450℃ to sinter into a ceramic pump body; S3.11 Finishing: The ceramic pump body after the sintering is placed on a grinding machine for grinding to ensure the size accuracy of the ceramic pump body; Step S4: The ceramic pump body after the finishing, the front pump cover and the rear pump cover made in step S2 are respectively installed into the metal pump shell in step S1; Step S5: Grouting: The adhesive is grouted into the gap between the ceramic pump body, the front pump cover, the rear pump cover and the metal pump shell to bond the above components into a whole; Step S6: Assembly: The metal pump shell with the ceramic flow-through components installed inside and the impeller, the motor, the coupling and the mechanical seal are installed onto the centrifugal pump base; Step S7: Inspection and storage: The ceramic centrifugal pump after the assembly is detected, and after the detection, the pump is painted and stored.

[0006] Preferably, in the step S2 of making the ceramic pump cover, the pressure casting method uses the semi-dry ceramic powder with the water content of 5%-10%, and the stamping machine and the pump cover mold are used for stamping forming.

[0007] Preferably, in the step S3.2 of grinding, the grinding time is 10-12 hours.

[0008] Preferably, in the step S3.3 of slurry storage, the static storage time is 20-24 hours.

[0009] Preferably, in the step S3.4 of slurry into the tank, the slurry is sucked into the tank by forming a vacuum negative pressure in the pressure tank, and the tank pressure is-0.1 to-0.2 MPa.

[0010] Preferably, in the step S3.5 of slurry into the mold, the tank pressure is 1.0-1.5 MPa; the pump body mold is made of gypsum; one pressure tank is connected to multiple pump body molds, and the ceramic slurry is simultaneously pressed into the multiple pump body molds.

[0011] Preferably, in the step S3.6 of pressure maintaining, the tank pressure is 1.0-1.5 MPa, and the pressure maintaining time is 2-2.5 hours.

[0012] Preferably, in the demoulding process of step S3.7, the upper mold must be removed first, and the drying mold must be covered on the original upper mold position, and then the whole mold must be flipped 180 degrees, so that the drying mold is flipped to the bottom, the lower mold is flipped to the top, and then the lower mold is removed; the drying mold has the same cavity as the upper mold.

[0013] Preferably, in the drying process of step S3.9, a supporting sponge pad is placed at the flow channel position in the cavity of the ceramic pump blank to prevent the flow channel from deforming, and the drying time is 2 to 4 weeks.

[0014] Preferably, in the sintering process of step S3.10, the dried ceramic pump blank is first placed on a pad, and a number of support blocks are placed in the flow channel cavity of the ceramic pump blank to prevent shrinkage and deformation during sintering; after sintering is completed, the ceramic pump body is obtained by cooling with the furnace.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The ceramic pump production process of the present invention includes making a metal pump casing, making a ceramic pump cover, making a ceramic pump body, assembly, grouting, final assembly and inspection and warehousing. The ceramic pump body production process includes preparing raw materials, grinding, slurry storage, slurry entering a tank, slurry entering a mold, maintaining pressure, demolding, blank repairing, drying, sintering and finishing. It has the advantages of simple process flow, low cost and high efficiency, and can realize mass production of ceramic centrifugal pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a process flow chart of a ceramic pump production process. DETAILED DESCRIPTION

[0017] See also Figure 1 The present invention relates to a ceramic pump production process, comprising the following steps: Step S1: making a metal pump housing; Step S2: Making a ceramic pump cover: The ceramic pump cover, including the front pump cover and the rear pump cover, is made by die casting or mold casting. The die casting method uses semi-dry ceramic powder with a moisture content of 5% to 10%, and uses a punching machine and a corresponding pump cover mold to perform stamping and forming. The powder is then placed in a heating furnace and sintered as in step S3.10 to obtain the ceramic pump cover. The mold casting method is similar to step S3, except that the pump body mold in step S3 is replaced with a pump cover mold. Step S3: Making a ceramic pump body: S3.1 Prepare raw materials: Mix pottery clay, wood clay, kaolin and water in appropriate proportions; S3.2 Grinding: The prepared raw materials are put into a ball mill and ground into a slurry; the grinding time is 10 to 12 hours; S3.3 Slurry storage: after the slurry is ground, it is introduced into a storage tank for storage, and the storage time is 20-24 hours; suitable storage time can stabilize the particle state of each raw material component after grinding, improve the viscosity of the slurry, and ensure the flowability of the slurry during grouting; S3.4 Slurry into tank: the slurry after static storage is introduced into the pressure tank body; the pressure in the pressure tank body is controlled to-0.1 to-0.2 MPa by a vacuum pump, and the slurry is sucked into the pressure tank body by relying on the vacuum negative pressure formed in the pressure tank; S3.5 Slurry into mold: compressed gas is injected into the pressure tank to increase the pressure in the tank to 1.0-1.5 MPa, and the slurry is pressed into the pump body mold by relying on the pressure to form a ceramic pump blank; the pump body mold is made of gypsum and includes an upper mold and a lower mold; one pressure tank body is connected to multiple pump body molds, and ceramic slurry is simultaneously pressed into multiple pump body molds to batch produce ceramic pump blanks, thereby improving production efficiency; S3.6 Pressure maintenance: after the ceramic pump blank is formed in the pump body mold, the pressure is maintained at 1.0-1.5 MPa for 2-2.5 hours to improve the forming quality of the ceramic pump blank; S3.7 Demolding: the ceramic pump blank is removed from the mold; specifically, the upper mold is first removed, a drying mold is covered at the original position of the upper mold, and the drying mold has the same cavity as the upper mold; then the whole is turned over by 180 degrees, the drying mold is turned over to the bottom, the lower mold is turned over to the upper part, and then the lower mold is removed, and the ceramic pump blank is supported by the drying mold; S3.8 Blank repair: repair the defect positions of the ceramic pump blank; the drying mold and the ceramic pump blank are integrally transported to the blank repair platform, the ceramic pump blank is manually detected by artificial, and defects such as missing corners, cracks, burrs and the like are manually repaired; S3.9 Drying: the ceramic pump blank after the blank repair is placed in a cool place for drying; specifically, the ceramic pump blank and the drying mold are integrally transported to a cool place for drying treatment, and a support sponge pad is placed at the flow passage position in the ceramic pump blank cavity to prevent the flow passage from deforming, and the drying time is 2-4 weeks; S3.10 Sintering: the dried ceramic pump blank, front pump cover and rear pump cover are placed in a heating furnace and heated to 1200-1450℃ to sinter into a ceramic pump body; specifically, the dried ceramic pump blank is first placed on a cushion block, and a plurality of support blocks are placed in the flow passage cavity of the ceramic pump blank to prevent shrinkage and deformation during sintering; after sintering, the ceramic pump body, the front pump cover and the rear pump cover are obtained by cooling in the furnace; S3.11 Finishing: the sintered ceramic pump body is placed on a grinding machine for grinding to ensure the dimensional accuracy of the ceramic pump body; Step S4 assembly: the ceramic pump body after finishing, the front pump cover and the rear pump cover made in steps S2 and S3.10 are respectively installed into the metal pump shell of step S1; Step S5: Grouting: pouring adhesive into the gaps between the ceramic pump body, the front pump cover, the rear pump cover and the metal pump shell to bond the above components into a whole; Step S6: Final assembly: install the metal pump casing with ceramic flow components installed inside, as well as the impeller, motor, coupling, and mechanical seal onto the centrifugal pump base; Step S7: Inspection and warehousing: The assembled ceramic centrifugal pump is inspected, and after passing the inspection, it is painted and then put into storage.

[0018] The ceramic pump production process of the present invention includes making a metal pump casing, making a ceramic pump cover, making a ceramic pump body, assembly, grouting, final assembly and inspection and warehousing, wherein the process of making the ceramic pump cover includes two methods: die casting or mold casting; the process of making the ceramic pump body includes preparing raw materials, grinding, slurry storage, slurry into a tank, slurry into a mold, maintaining pressure, demolding, blank repairing, drying, sintering and finishing. It has the advantages of simple process flow, low cost and high efficiency, and can realize mass production of ceramic centrifugal pumps.

[0019] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.

Claims

1. A ceramic pump production process, characterized by: The following steps are involved: Step S1: making a metal pump housing; Step S2: manufacturing a ceramic pump cover: manufacturing the ceramic pump cover by die casting or die casting, including a front pump cover and a rear pump cover; Step S3: Making a ceramic pump body: S3.1 Prepare raw materials: Mix pottery clay, wood clay, kaolin and water in appropriate proportions; S3.2 Grinding: Put the prepared raw materials into the ball mill and grind them into slurry; S3.3 Slurry storage: After grinding, the slurry is introduced into the storage tank for storage; S3.4 Slurry feeding into the tank: The slurry that has been finished is introduced into the pressure tank; S3.5 Slurry injection into mold: Compressed gas is injected into the pressure tank to increase the pressure inside the tank. The slurry is pressed into the pump body mold by the pressure to form a ceramic pump blank; the pump body mold includes an upper mold and a lower mold; S3.6 Maintaining pressure: After the ceramic pump blank is formed in the pump body mold, continue to maintain pressure; S3.7 Demolding: Remove the ceramic pump blank from the mold; S3.8 Repairing: Repairing defects in ceramic pump blanks; S3.9 Drying: Place the finished ceramic pump blank in a cool place to dry; S3.10 Sintering: Place the dried ceramic pump blank, front pump cover and rear pump cover in a heating furnace and heat to 1200~1450℃ to sinter into a ceramic pump body; S3.11 Finishing: Place the sintered ceramic pump body on a grinding machine for grinding to ensure the dimensional accuracy of the ceramic pump body; Step S4: Assembling: installing the finely machined ceramic pump body, the front pump cover and the rear pump cover made in step S2 into the metal pump housing made in step S1; Step S5: Grouting: pouring adhesive into the gaps between the ceramic pump body, the front pump cover, the rear pump cover and the metal pump shell to bond the above components into a whole; Step S6: Final assembly: Install the metal pump casing with ceramic flow components installed inside, as well as the impeller, motor, coupling, and mechanical seal onto the centrifugal pump base; Step S7: Inspection and warehousing: The assembled ceramic centrifugal pump is inspected, and after passing the inspection, it is painted and put into storage.

2. The ceramic pump production process according to claim 1, characterized in that: The die-casting method in the step S2 of making the ceramic pump cover adopts semi-dry ceramic powder with a moisture content of 5% to 10% and performs stamping molding using a punching machine and a pump cover mold.

3. The ceramic pump production process according to claim 1, characterized in that: The grinding time in the step S3.2 grinding process is 10 to 12 hours.

4. The ceramic pump production process according to claim 1, characterized in that: The static storage time in the slurry storage process of step S3.3 is 20 to 24 hours.

5. The ceramic pump production process according to claim 1, characterized in that: In the step S3.4 of the slurry feeding process, the slurry is sucked into the tank by forming a vacuum negative pressure in the pressure tank, and the tank pressure is -0.1~-0.2 MPa.

6. The ceramic pump production process according to claim 1, characterized in that: In the step S3.5 of pouring the slurry into the mold, the tank pressure is 1.0-1.5 MPa; the pump body mold is made of gypsum; one pressure tank is connected to multiple pump body molds, and ceramic slurry is pressed into the multiple pump body molds at the same time.

7. The ceramic pump production process according to claim 1, characterized in that: In the pressure maintaining process of step S3.6, the tank pressure is 1.0-1.5 MPa, and the pressure maintaining time is 2-2.5 hours.

8. The ceramic pump production process according to claim 1, characterized in that: In the demolding process of step S3.7, the upper mold must be removed first, and the drying mold must be covered on the original upper mold position, and then the whole mold must be flipped 180 degrees, so that the drying mold is flipped to the bottom and the lower mold is flipped to the top, and then the lower mold is removed; the drying mold has the same cavity as the upper mold.

9. The ceramic pump production process according to claim 1, characterized in that: In the drying process of step S3.9, a supporting sponge pad is placed at the flow channel position in the cavity of the ceramic pump blank to prevent the flow channel from deforming. The drying time is 2 to 4 weeks.

10. The ceramic pump production process according to claim 1, characterized in that: In the sintering process of step S3.10, the dried ceramic pump blank is first placed on a pad, and several support blocks are placed in the flow channel cavity of the ceramic pump blank to prevent shrinkage and deformation during sintering; after sintering, the ceramic pump body is obtained by cooling in the furnace.

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