Integrally modularly assembled disc type magnetic drive pump head and assembling method
The integrated modular assembly of the disc magnetic pump head, using a stainless steel ceramic shaft and silicon carbide bearings, combined with rubber plugs and anti-loosening design, solves the bearing wear problem of traditional canned water pumps, achieving longer service life, more efficient operation, and convenient installation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-04-14
AI Technical Summary
The bearing wear and lifespan issues of traditional permanent magnet shielded water pumps depend on medium lubrication and cooling, and require high medium cleanliness. Dry running will lead to increased bearing wear and noise, and eventually seizure.
The integrated modular assembly of the disc magnetic pump head uses a stainless steel ceramic shaft and silicon carbide bearings, combined with rubber plugs and anti-loosening design to ensure bearing lubrication and cooling, prevent dry running, and achieve precise concentric assembly through a stainless steel centering tooling shaft.
It achieves longer bearing life, smaller working clearance, smoother operation, less pump vibration, improved efficiency, and quick installation and convenient maintenance.
Smart Images
Figure CN121854483A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of magnetic pump technology, specifically, it relates to an integrated modular assembly disc magnetic pump head and its assembly method. Background Technology
[0002] A canned motor pump is a leak-free pump that integrates a pump and a canned motor. Due to its advantages such as leak-free operation, small size, and low noise, it is an important piece of equipment for conveying special cooling liquids, toxic liquids (such as toxins and foul-smelling liquids), hazardous liquids (such as corrosive, explosive, flammable, and volatile liquids), and valuable liquids. It is widely used in many fields such as petrochemicals, defense, aerospace, air conditioning and refrigeration, coolant cooling systems, pharmaceuticals, food, and nuclear energy.
[0003] The main disadvantages of traditional permanent magnet shielded water pumps include: bearing wear and lifespan issues; reliance on the medium for lubrication and cooling: the pump's sliding bearings (graphite bearings / ceramic bearings) rely entirely on the pumped liquid for lubrication and cooling. High requirements for medium cleanliness: if the liquid contains solid particles or impurities, it will drastically accelerate the wear of the bearings and thrust disc, leading to decreased efficiency, increased noise, and ultimately, seizure. Dry running is fatal: dry running is absolutely prohibited. Even in extremely short periods of dry running, the bearings will wear rapidly due to lack of lubrication and cooling, overheating and seizing, rendering the entire pump unusable. Summary of the Invention
[0004] To address the aforementioned problems in the prior art, this invention provides an integrated modular assembly disc magnetic pump head and its assembly method.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: As one aspect of the present invention, a modularly assembled disc-type magnetic pump head is proposed, comprising: a pump housing having a receiving cavity, an inlet and an outlet on the pump housing, the inlet and outlet respectively communicating with the receiving cavity of the pump housing; a partition plate is installed on the end face of the receiving cavity of the pump housing; a stainless steel ceramic shaft is installed between the pump housing and the partition plate, one end of the stainless steel ceramic shaft is installed on the shaft center hole of the pump housing, the center line of the shaft center hole coincides with the center line of the inlet, and the other end of the stainless steel ceramic shaft... The end is installed in the mounting groove of the partition plate through a silicon carbide D-shaped sleeve; a circular silicon carbide sleeve is installed on the stainless steel ceramic shaft, and the circular silicon carbide sleeve is connected to the receiving cavity of the pump casing; a silicon carbide bearing is installed on the stainless steel ceramic shaft, and the silicon carbide bearing is located between the circular silicon carbide sleeve and the silicon carbide D-shaped sleeve; an integral impeller is installed on the silicon carbide bearing, and the integral impeller is located in the receiving cavity of the pump casing; a plurality of first magnets are installed on the rear end face of the integral impeller; the first magnets are located in the receiving cavity of the pump casing.
[0006] Furthermore, a connecting ring is installed on the pump casing by fasteners, and the connecting ring presses and fixes the partition plate.
[0007] Furthermore, the stainless steel ceramic shaft includes a stainless steel shaft, the surface of which, except for the mounting position for mounting the silicon carbide D-shaped sleeve, is formed with a ceramic layer.
[0008] Furthermore, a rubber plug is installed at the other end of the central hole of the shaft; a rubber plug through hole is opened in the middle of the rubber plug, allowing the medium to enter the rubber plug.
[0009] Furthermore, the periphery of the rubber plug is formed with an anti-retraction ring rib, which is adapted to the anti-retraction ring groove in the central hole of the shaft.
[0010] Furthermore, a 1mm gap is reserved between the circular silicon carbide sleeve and the inner end face of the shaft center hole, and the inner end face of the rubber plug is close to the front end face of the stainless steel ceramic shaft.
[0011] As another aspect of the present invention, an assembly method for an integrally modular disc magnetic pump head is proposed, the assembly method being as follows: Step S11: Design a stainless steel centering tooling shaft, which is a profile part of a stainless steel ceramic shaft; Insert the stainless steel centering fixture shaft into the center hole of the shaft, fit the circular silicon carbide sleeve, and then insert the integral impeller with magnets onto the stainless steel centering fixture shaft. This places the integral impeller into the receiving space of the pump casing. The D end of the stainless steel centering fixture shaft is the rear end of the pump casing. Insert the silicon carbide D-shaped sleeve on the partition plate onto the D end of the stainless steel centering fixture shaft, then install the partition plate into the stop of the pump casing and secure it to the pump casing with a connecting ring. Here, the stop of the pump casing and the outer diameter of the partition plate are clearance-fitted to ensure that the partition plate does not deform during assembly. The clearance between the stainless steel centering fixture shaft and the silicon carbide bearing of the integral impeller is 0.01mm-0.02mm, and the stainless steel centering fixture shaft has a taper to ensure that the bearing hole of the silicon carbide bearing on the integral impeller is tightly fitted with the stainless steel centering fixture shaft. Simultaneously, ensure that the center hole of the pump casing shaft is concentric with the silicon carbide D-shaped sleeve on the partition plate. Step S12: Place the pump head assembly with the baffle plate installed upright with the outlet facing upward, pull out the stainless steel centering tool shaft, and then insert the D end of the stainless steel ceramic shaft downward into the shaft center hole of the pump housing. Note that the flat end of the D end of the stainless steel ceramic shaft is consistent with the flat end of the D end of the stainless steel centering tool shaft that was taken out, so that the D end of the stainless steel ceramic shaft is completely inserted into the sleeve hole of the silicon carbide D-shaped sleeve on the baffle plate. Step S13: Next, use a rubber plug to seal the end of the shaft center hole of the pump casing to prevent the stainless steel ceramic shaft from axially moving out during impeller rotation, and at the same time, it also plays a role in vibration reduction and noise reduction; it ensures the perpendicularity of the center of the silicon carbide bearing to the plane of the partition plate, thereby ensuring that the working air gap is uniform and there is no swaying during the operation of the integral impeller driven, the water pump vibration is small, and the water pump operation is stable; at the same time, the integrated assembly of the disc magnetic pump head forms an independent component, which is quick to install.
[0012] The integrated modular assembly disc magnetic pump head and assembly method of the present invention have the following advantages: the integrated and modular assembly disc magnetic water pump head is a completely sealed shielded pump head, which adopts silicon carbide bearings, resulting in longer bearing life, smaller working clearance, smoother operation, less pump vibration, less bearing resistance, and further improved pump efficiency.
[0013] It uses a stainless steel ceramic shaft, which is stronger and does not have the fragility problem of ceramic shafts, and can achieve a long service life and maintenance-free operation.
[0014] The use of anti-loosening rubber plugs provides pre-tightening and vibration reduction when the integral impeller is in operation. This is because the water flow impacts the impeller, causing it to oscillate axially and drive the stainless steel ceramic shaft to move axially. Attached Figure Description
[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.
[0016] Figure 1 This is a schematic diagram of the integrated modular assembly disc magnetic pump head of the present invention. Figure 2 This is a schematic diagram of the structure of the rubber stopper of the present invention; Figure 3 This is a schematic diagram of the structure of the stainless steel ceramic shaft of the present invention; Figure 4 This is a structural layout diagram of the first magnet of the present invention; Figure 5 Assembly of the pump head assembly of the present invention Figure 1 ; Figure 6 Assembly of the pump head assembly of the present invention Figure 2 ; Figure 7 Assembly of the pump head assembly of the present invention Figure 3 ; Figure 8 Assembly of the pump head assembly of the present invention Figure 4 . Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0018] One embodiment of this application provides an integrated modular assembly of a disc-type magnetic pump head, such as... Figures 1-4 As shown, it includes: a pump housing 11, the pump housing 11 having a receiving cavity, the pump housing 11 having an inlet 12 and an outlet 13, the inlet 12 and the outlet 13 respectively communicating with the receiving cavity of the pump housing 11; a partition 14 is installed on the end face of the receiving cavity of the pump housing 11, and a connecting ring 15 is installed on the pump housing 11 by fasteners, the connecting ring 15 pressing and fixing the partition 14; a stainless steel ceramic shaft 16 is installed between the pump housing 11 and the partition 14, one end of the stainless steel ceramic shaft 16 is installed in the shaft center hole 111 of the pump housing 11, the shaft center hole 11... The centerline of 1 coincides with the centerline of the inlet 12. The other end of the stainless steel ceramic shaft 16 is installed in the mounting groove of the partition plate 14 through the silicon carbide D-shaped sleeve 17. A circular silicon carbide sleeve 18 is installed on the stainless steel ceramic shaft 16, and the circular silicon carbide sleeve 18 is connected to the receiving cavity of the pump casing 11. A silicon carbide bearing 19 is installed on the stainless steel ceramic shaft 16, and the silicon carbide bearing 19 is located between the circular silicon carbide sleeve 18 and the silicon carbide D-shaped sleeve 17. An integral impeller 110 is installed on the silicon carbide bearing 19, and the integral impeller 110 is located in the receiving cavity of the pump casing 11. The stainless steel ceramic shaft 16 includes a stainless steel shaft 161, and a ceramic layer 162 is formed on the surface of the stainless steel shaft 161 except for the mounting position for mounting the silicon carbide D-shaped sleeve 17. A rubber plug 112 is installed at the other end of the shaft center hole 111; a rubber plug through hole 1121 is opened in the middle of the rubber plug 112, allowing the medium to enter the rubber plug 112; an anti-retraction ring rib 113 is formed around the rubber plug 112, which is adapted to the anti-retraction ring groove in the shaft center hole 111 to play an anti-retraction function. More importantly, it can effectively prevent the axial movement of the stainless steel ceramic shaft 16. When the integral impeller 110 is working, due to the impact of the water flow, the integral impeller 110 swings axially. To prevent the integral impeller 110 from jamming, a 1mm gap is reserved between the circular silicon carbide sleeve 18 and the inner end face of the shaft center hole 111. The inner end face of the rubber plug 112 is close to the front end face of the stainless steel ceramic shaft 16. When the integral impeller 110 swings axially and drives the stainless steel ceramic shaft 16 to move axially, it plays a pre-tightening and vibration damping role, thereby reducing vibration noise. A plurality of first magnets 114 are mounted on the rear end face of the integral impeller 110; the first magnets 114 are located in the receiving cavity of the pump casing 11; the integral impeller 110 is provided with magnet slots for mounting the first magnets 114. The integral impeller 110 serves as the driven magnetic disk's guiding yoke. Made of precision-cast magnetically conductive stainless steel, it eliminates the drawbacks of a separate magnetic yoke requiring complex installation, difficulty in ensuring yoke flatness and concentricity, and large working air gaps leading to material consumption. Furthermore, using magnetically conductive stainless steel as the guiding yoke facilitates magnet attachment after magnetization and enhances axial magnetic field strength, resulting in excellent magnetization. The magnet matrix distribution, consisting of thick magnetized magnets and two wide magnetized magnets, allows for a yoke-free magnetic circuit. Therefore, using magnetically conductive stainless steel for the integral impeller provides better strength, excellent magnetization, and a simple manufacturing process that ensures the perpendicularity of the magnet plane to the axis – a truly multifaceted advantage.
[0019] In this embodiment, as Figures 5-8 As shown, the assembly method of the integrated modular disc magnetic pump head is as follows: Step S11: Design stainless steel centering tooling shaft 115, which is a copying part of stainless steel ceramic shaft 16. Insert the stainless steel centering shaft 115 into the shaft center hole 111, fit the circular silicon carbide sleeve 18, and then insert the integral impeller with magnets onto the stainless steel centering shaft 115. This places the integral impeller into the receiving chamber of the pump casing. The D end of the stainless steel centering shaft 115 is the rear end of the pump casing. Insert the silicon carbide D-shaped sleeve on the partition plate onto the D end of the stainless steel centering shaft 115, then install the partition plate into the stop of the pump casing and secure it to the pump casing with a connecting ring. The stop of the pump casing and the outer diameter of the partition plate are clearance fit to ensure that the partition plate does not deform during assembly. The stainless steel centering tooling shaft and the silicon carbide bearing of the integral impeller are tight fit with a small clearance of only 0.01mm-0.02mm. The stainless steel centering tooling shaft has a slight taper to ensure that the bearing hole of the silicon carbide bearing on the integral impeller is tight fit with the stainless steel centering tooling shaft 115. At the same time, it ensures that the shaft center hole of the pump casing is concentric with the silicon carbide D-shaped sleeve on the partition plate. Step S12: Place the pump head assembly with the baffle plate installed upright with the outlet facing upward, pull out the stainless steel centering tool shaft, and then insert the D end of the stainless steel ceramic shaft downward into the shaft center hole of the pump housing. Note that the flat end of the D end of the stainless steel ceramic shaft is consistent with the flat end of the D end of the stainless steel centering tool shaft that was taken out, so that the D end of the stainless steel ceramic shaft is completely inserted into the sleeve hole of the silicon carbide D-shaped sleeve on the baffle plate. Step S13: Next, use a rubber plug to seal the end of the shaft center hole of the pump casing to prevent the stainless steel ceramic shaft from axially moving out during impeller rotation, and at the same time, it also plays a role in vibration reduction and noise reduction. This innovation ensures the perpendicularity of the center of the silicon carbide bearing to the plane of the partition plate, thereby ensuring that the working air gap is uniform and there is no swaying during the operation of the integral impeller driven by the impeller, resulting in low pump vibration and stable pump operation. At the same time, the integrated assembly of the disc magnetic pump head forms an independent component, which is quick to install, simple in process, convenient to maintain, and low in cost.
[0020] The above assembly method uses a stainless steel centering tooling shaft 115 to position the impeller assembly and the silicon carbide D-shaped sleeve on the partition plate. Then, the partition plate is locked to the pump casing. The stainless steel centering tooling shaft 115 is then pulled out and a stainless steel ceramic shaft is installed. This ensures that the plane of the integral impeller, the stainless steel ceramic shaft and the partition plate are perpendicular, ensuring that the working air gap of the magnetic disk is uniform and the integral impeller rotates smoothly without oscillation or vibration.
[0021] This embodiment features an integrated, modularly assembled disc-type magnetic pump head, which is a completely sealed shielded pump head. Therefore, the permanent magnet drive motor connected to it is also independent. The protection level of the drive motor is not limited by traditional shielded pumps; it can be IP44, IP54, IP67, or even open-type P21 or IP23. Furthermore, it does not have the extremely stringent concentricity requirements of traditional shielded pumps for the impeller shaft, drive motor rotor, and stator. The modular, high-efficiency, low-vibration disc-type magnetic pump driven by an integrated controller and permanent magnet motor operates more smoothly and reliably, with lower vibration and noise.
[0022] The axial magnetic field disc-type magnetic water pump head uses reactive silicon carbide bearings, which have a longer bearing life, smaller working clearance, smoother operation, less pump vibration, less bearing resistance, and further improved pump efficiency.
[0023] The use of anti-loosening rubber plugs provides pre-tightening and vibration reduction when the integral impeller is in operation. This is because the water flow impacts the impeller, causing it to oscillate axially and drive the stainless steel ceramic shaft to move axially.
[0024] Because this invention is an axial magnetic field disc-type magnetic water pump head, the fixed shaft is shorter, the bearing resistance is lower, and the pump efficiency is further improved. The fixed shaft of the axial magnetic field disc-type magnetic water pump head is made of stainless steel ceramic shaft, which has higher strength and does not have the fragility problem of ceramic shaft, thus achieving a long service life and maintenance-free operation.
[0025] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.
[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0027] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.
Claims
1. A modularly assembled disc-type magnetic pump head, characterized in that, It includes: A pump housing (11) has a receiving cavity. The pump housing (11) is provided with an inlet (12) and an outlet (13), which are respectively connected to the receiving cavity of the pump housing (11). A partition (14) is installed on the end face of the receiving cavity of the pump housing (11). A stainless steel ceramic shaft (16) is installed between the pump housing (11) and the partition (14). One end of the stainless steel ceramic shaft (16) is installed on the shaft center hole (111) of the pump housing (11). The center line of the shaft center hole (111) coincides with the center line of the inlet (12). The other end of the stainless steel ceramic shaft (16) is installed on the partition through a silicon carbide D-shaped sleeve (17). (14) is installed in the mounting groove; a circular silicon carbide sleeve (18) is installed on the stainless steel ceramic shaft (16), and the circular silicon carbide sleeve (18) is connected to the receiving cavity of the pump casing (11); a silicon carbide bearing (19) is installed on the stainless steel ceramic shaft (16), and the silicon carbide bearing (19) is located between the circular silicon carbide sleeve (18) and the silicon carbide D-shaped sleeve (17); an integral impeller (110) is installed on the silicon carbide bearing (19), and the integral impeller (110) is located in the receiving cavity of the pump casing (11); a plurality of first magnets (114) are installed on the rear end face of the integral impeller (110); the first magnets (114) are located in the receiving cavity of the pump casing (11).
2. The integrated modular assembly disc magnetic pump head and assembly method as described in claim 1, characterized in that, A connecting ring (15) is installed on the pump housing (11) by fasteners, and the connecting ring (15) presses and fixes the partition (14).
3. The integrated modular assembly disc magnetic pump head and assembly method as described in claim 1, characterized in that, The stainless steel ceramic shaft (16) includes a stainless steel shaft (161), and a ceramic layer (162) is formed on the surface of the stainless steel shaft (161) except for the mounting position for mounting the silicon carbide D-shaped sleeve (17).
4. The integrated modular assembly disc magnetic pump head and assembly method as described in claim 1, characterized in that, A rubber plug (112) is installed at the other end of the shaft center hole (111); a rubber plug through hole (1121) is opened in the middle of the rubber plug (112), and the medium can enter the rubber plug (112).
5. The integrated modular assembly disc magnetic pump head and assembly method as described in claim 4, characterized in that, The rubber plug (112) has an anti-retraction ring rib (113) around its periphery, and the anti-retraction ring rib (113) is adapted to the anti-retraction ring groove in the shaft center hole (111).
6. The integrated modular assembly disc magnetic pump head and assembly method as described in claim 5, characterized in that, The circular silicon carbide sleeve (18) has a 1mm gap between its inner end face and the shaft center hole (111), and the inner end face of the rubber plug (112) is close to the front end face of the stainless steel ceramic shaft (16).
7. The assembly method of the integrated modular assembly disc magnetic pump head as described in claim 1, characterized in that, The assembly method is as follows: Step S11: Design a stainless steel centering tooling shaft (115), which is a contour part of a stainless steel ceramic shaft (16); Insert the stainless steel centering tooling shaft (115) into the shaft center hole (111), and fit the circular silicon carbide sleeve (18) into it. Then insert the integral impeller with magnets onto the stainless steel centering tooling shaft. In this way, the integral impeller is placed into the receiving chamber of the pump casing. The D end of the stainless steel centering tooling shaft is the rear end of the pump casing. Insert the silicon carbide D-shaped sleeve on the partition plate into the D end of the stainless steel centering tooling shaft. Then install the partition plate into the stop of the pump casing and tighten it with the pump casing with the connecting ring. The stop of the pump casing and the outer diameter of the partition plate are clearance fit to ensure that the partition plate does not deform during assembly. The clearance fit between the stainless steel centering tooling shaft and the silicon carbide bearing of the integral impeller is 0.01mm-0.02mm. The stainless steel centering tooling shaft has a taper to ensure that the bearing hole of the silicon carbide bearing on the integral impeller is tight fit with the stainless steel centering tooling shaft. At the same time, ensure that the shaft center hole of the pump casing is concentric with the silicon carbide D-shaped sleeve on the partition plate. Step S12: Place the pump head assembly with the baffle plate installed upright with the outlet facing upward, pull out the stainless steel centering tool shaft, and then insert the D end of the stainless steel ceramic shaft downward into the shaft center hole of the pump housing. Note that the flat end of the D end of the stainless steel ceramic shaft is consistent with the flat end of the D end of the stainless steel centering tool shaft that was taken out, so that the D end of the stainless steel ceramic shaft is completely inserted into the sleeve hole of the silicon carbide D-shaped sleeve on the baffle plate. Step S13: Use a rubber plug to seal the end of the shaft center hole of the pump casing to prevent the stainless steel ceramic shaft from axially moving out during impeller rotation and to reduce vibration and noise. This ensures the perpendicularity of the center of the silicon carbide bearing to the plane of the partition plate, thereby ensuring that the working air gap of the integral impeller is uniform, without swaying, and the water pump vibrates less during driven operation.