Integral leakage-free chemical pump

Abstract

The utility model discloses an integrated leakage-free chemical pump, including pump part and permanent magnet motor part, the pump part is by pump body, pump body mouth ring, impeller, impeller mouth ring is composed, the pump body mouth ring is closely inbedded on the pump body, permanent magnet motor part is by stator part, rotor part and support shaft part three parts are composed, the stator part includes stator winding iron core, frame, back cover, the frame is fixedly connected with the pump body, the stator winding iron core is assembled in the inner ring of frame, the utility model discloses stator is isolated medium by injection molding shielding layer, need not the metal spare such as iron core, frame with other metal spare is changed for high -priced corrosion -resistant material, impeller and injection molding permanent magnet rotor adopt fluorine plastic integral injection molding, fluorine plastic corrosion resistance is strong and material, and the processing cost is low, the pump body mouth ring and impeller mouth ring use pressureless sintered silicon carbide simultaneously, and its corrosion -resistant wear resistance is comparable with metal, but the cost is lower, can also replace alone, guarantee corrosion -resistant demand, and the material of whole pump and later maintenance cost are reduced greatly.

Description

Technical Field

[0001] This utility model belongs to the field of chemical shielded pump technology, and particularly relates to an integrated leak-free chemical pump. Background Technology

[0002] In pumping applications involving flammable, explosive, toxic, corrosive, or valuable liquids, chemical canned pumps are often used to minimize or even eliminate the risk of media leakage.

[0003] In applications involving highly corrosive media, all components of a chemical shielded pump that come into contact with the media are often made of corrosion-resistant and high-strength metals such as double-sided stainless steel. This approach presents the following problems: On the one hand, this leads to relatively high production and manufacturing costs for the entire pump; On the other hand, the key component of the pump—the metal shielding sleeve—generates large eddy currents during pump operation, resulting in significant eddy current losses and heat generation in the motor. Utility Model Content

[0004] This utility model addresses the problems in the prior art by proposing the following technical solution: An integrated leak-free chemical pump includes a pump component and a permanent magnet motor component. The pump component consists of a pump body, a pump body inlet ring, an impeller, and an impeller inlet ring. The pump body inlet ring is tightly embedded in the pump body. The permanent magnet motor component consists of three parts: a stator component, a rotor component, and a support shaft component. The stator component includes a stator winding core, a base, and a rear cover. The base is fixedly connected to the pump body. The stator winding core is assembled in the inner ring of the base. The rear cover is assembled at the tail end of the base. The gap between the stator winding core, the base, and the rear cover is filled with an injection-molded shielding layer. The rotor component includes an injection-molded permanent magnet rotor and a sliding bearing. The impeller mouth ring is embedded in the impeller, and the impeller is sleeved on the outer ring of the sliding bearing. Both the impeller and the injection-molded permanent magnet rotor are integrally injection molded using, but not limited to, fluoroplastic particles. The support shaft component includes a shaft and a thrust ring, with both the thrust ring and the sliding bearing fitted onto the outer ring of the shaft.

[0005] As a preferred embodiment of the above technical solution, the injection-molded shielding layer covers the assembly gap and exposed end face of the stator winding core, the base and the rear cover.

[0006] As a preferred embodiment of the above technical solution, the outer ring of the sliding bearing is tightly embedded in the injection-molded permanent magnet rotor, the inner ring of the sliding bearing is clearance-fitted with the shaft, and the injection-molded permanent magnet rotor and the impeller are formed into an integral structure without splicing gaps through the same injection molding process.

[0007] As a preferred embodiment of the above technical solution, the inner ring of the thrust ring is clearance-fitted with the shaft, and the outer ring of the thrust ring is interference-fitted with the rear cover.

[0008] As a preferred embodiment of the above technical solution, both the pump body inlet ring and the impeller inlet ring are made of, but not limited to, pressureless sintered silicon carbide, and there is an adaptation gap between them.

[0009] As a preferred embodiment of the above technical solution, the surface of the shaft that mates with the inner ring of the sliding bearing is provided with a spiral groove.

[0010] The beneficial effects of this utility model are as follows: 1. The stator of this utility model is isolated from the medium by injection-molded shielding layer, without the need to replace the iron core, frame and other metal parts with expensive corrosion-resistant materials. The impeller and injection-molded permanent magnet rotor are integrally injection molded with fluoroplastic. Fluoroplastics have strong corrosion resistance and low material and processing costs. At the same time, the pump body inlet ring and impeller inlet ring are made of pressureless sintered silicon carbide, which has corrosion resistance and wear resistance comparable to metal but at a lower cost. They can also be replaced separately, which not only ensures corrosion resistance requirements, but also greatly reduces the overall pump material and subsequent maintenance costs. 2. The stator injection-molded shielding layer and rotor fluoroplastic of this utility model are both non-magnetic materials, which will not generate large eddy currents in the magnetic field, thus reducing eddy current losses from the source. At the same time, the helical grooves on the mating surface of the shaft and the sliding bearing can guide the flow of the medium when the shaft rotates, carrying away frictional heat, further alleviating motor heating, avoiding high temperature damage to motor components, and significantly improving motor operating efficiency and service life. Attached Figure Description

[0011] Figure 1 The diagram shown is a structural schematic of the integrated leak-free chemical pump in the embodiment. Figure 2 The diagram shown is a structural schematic of the rotor component in the embodiment; Figure 3 The diagram shown is a structural schematic of the support shaft component in the embodiment.

[0012] Explanation of reference numerals in the attached figures: 11. Pump body; 12. Pump body inlet ring; 13. Impeller; 14. Impeller inlet ring; 21. Stator winding core; 22. Frame; 23. Rear cover; 31. Injection-molded permanent magnet rotor; 32. Sliding bearing; 41. Shaft; 42. Thrust ring. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0014] Example like Figure 1 , Figure 2 and Figure 3As shown, the integrated leak-free chemical pump includes a pump component and a permanent magnet motor component. The pump component consists of a pump body 11, a pump body inlet ring 12, an impeller 13, and an impeller inlet ring 14. The pump body inlet ring 12 is tightly embedded in the pump body 11. The permanent magnet motor component consists of three parts: a stator component, a rotor component, and a support shaft component. The pump component is specifically responsible for the suction, pressurization, and transportation of chemical media. The permanent magnet motor component provides stable rotational power to the pump component. The two work together to ensure the realization of the pump's basic transportation function and avoid operational failures caused by confusion between structural functions.

[0015] Specifically, the pump body inlet ring 12 features a "tightly embedded" design: through a physical tight fit, the gap between the pump body 11 and the pump body inlet ring 12 is eliminated, preventing chemical media from leaking from the joint between the two. This is especially beneficial for flammable, explosive, toxic, or valuable media, reducing the risk of leakage from the structural source. At the same time, it ensures the coaxiality of the inlet ring and the pump body 11, avoiding additional wear caused by misalignment during operation.

[0016] like Figure 1 and Figure 2 As shown, the stator assembly includes a stator winding core 21, a base 22, and a rear cover 23. The base 22 is fixedly connected to the pump body 11. The stator winding core 21 is assembled in the inner ring of the base 22, and the rear cover 23 is assembled at the tail end of the base 22. The gap between the stator winding core 21, the base 22, and the rear cover 23 is filled with an injection-molded shielding layer.

[0017] Specifically, the base 22 is fixedly connected to the pump body 11: This ensures the coaxiality of the pump component's medium conveying end and the permanent magnet motor component's power end, reduces vibration and noise caused by axial misalignment during operation, and improves the overall structural rigidity, preventing performance degradation caused by component loosening after long-term operation.

[0018] like Figure 1 and Figure 2 As shown, the inner ring of the mounting base 22 for the stator winding core 21: The mounting base 22 provides a stable mounting reference and protective shell for the stator winding core 21, ensuring that the core is fixed in position when it generates a magnetic field, and that the magnetic field is evenly distributed, thus avoiding core displacement that could lead to unstable motor output torque and ensuring power transmission efficiency.

[0019] The rear cover 23 and the mounting base 22 at the tail end serve to seal and protect. On the one hand, they prevent external dust, moisture and other impurities from entering the stator, preventing the stator winding core 21 from getting damp or contaminated and short-circuiting. On the other hand, they protect the core from external impacts and extend the service life of the stator components.

[0020] Gap-filled injection-molded shielding layer: The core effects are "corrosion prevention + eddy current reduction". First, the injection-molded shielding layer is made of corrosion-resistant plastic, which isolates the chemical medium from the metal materials of the stator components (such as the iron core and frame 22), preventing the metal from being corroded and solving the problem of easy corrosion of traditional all-metal stators. Second, plastic is a non-magnetic material. Compared with traditional metal shielding sleeves, it will not generate large eddy currents under the action of a magnetic field, which greatly reduces the eddy current loss of the motor, reduces motor heat generation, improves motor operating efficiency, reduces energy consumption, and at the same time avoids high temperature damage to the motor insulation layer, extending the motor life.

[0021] like Figure 1 and Figure 2 As shown, the rotor component includes an injection-molded permanent magnet rotor 31, a sliding bearing 32, an impeller mouth ring 14 embedded in the impeller 13, and the impeller 13 sleeved on the outer ring of the sliding bearing 32. Both the impeller 13 and the injection-molded permanent magnet rotor 31 are integrally injection molded using, but not limited to, fluoroplastic particles.

[0022] Fluoroplastic integral injection molding (impeller 13 + injection-molded permanent magnet rotor 31): Fluoroplastic has excellent corrosion resistance (resisting the erosion of most chemical media such as acids, alkalis, and organic solvents), solving the problem of easy corrosion of traditional metal rotors; "integral injection molding" makes the impeller 13 and permanent magnet rotor seamless, which on the one hand prevents the medium from penetrating into the rotor from the splice seam and damaging the permanent magnet or bearing, and on the other hand eliminates the rotor imbalance caused by splicing, reduces vibration during operation, improves the pump's operating stability, and simplifies the assembly process and reduces production errors.

[0023] The impeller wear ring 14 is embedded in the impeller 13: to ensure a tight fit between the wear ring and the impeller 13 and to prevent the wear ring from falling off during operation; as an easily worn part inside the pump (which is sealed in conjunction with the pump body wear ring 12), the embedded design makes it easy to replace the wear ring separately in the future without replacing the entire impeller 13, thus reducing maintenance costs and cycle.

[0024] Impeller 13 is mounted on the outer ring of sliding bearing 32: sliding bearing 32 provides radial support for impeller 13, ensuring that impeller 13 always maintains coaxiality when rotating at high speed, avoiding the reduction in media conveying efficiency or friction with pump body 11 caused by impeller 13 being eccentric; at the same time, through the lubrication of sliding bearing 32, friction loss during impeller 13 rotation is reduced, and energy utilization is improved.

[0025] like Figure 1 , Figure 2 and Figure 3As shown, the support shaft component includes a shaft 41 and a thrust ring 42. Both the thrust ring 42 and the sliding bearing 32 are sleeved on the outer ring of the shaft 41. The sliding bearing 32 mainly bears the radial force of the shaft 41 (to prevent the shaft 41 from radially shifting), and the thrust ring 42 mainly bears the axial force of the shaft 41 (to prevent the shaft 41 from axially moving). The two work together to form a "radial + axial" all-round support, ensuring that the shaft 41 is stable in position when rotating at high speed, avoiding the rotor component (connected to the shaft 41) from colliding with the stator component due to offset, or the impeller 13 from rubbing against the pump body 11 due to offset, thus ensuring the safe operation of the pump.

[0026] Specifically, the core supporting function of shaft 41 is to provide a unified installation benchmark for sliding bearing 32 and thrust ring 42, ensuring the assembly accuracy of each part of the support shaft component; at the same time, shaft 41 serves as a "bridge" for power transmission, transmitting the rotational power of the permanent magnet rotor to impeller 13, ensuring lossless power transmission and maintaining the pump's delivery efficiency.

[0027] like Figure 1 and Figure 2 As shown, the injection-molded shielding layer covers the assembly gap and exposed end face of the stator winding core 21, the frame 22 and the rear cover 23.

[0028] It should be noted that compared to "filling only the gaps", "fully covering the exposed end faces" further expands the protection range, completely isolating the medium from contact with all exposed metal surfaces of the stator components, and minimizing metal corrosion; at the same time, covering the exposed end faces can reduce the impact of the external environment (such as humidity and dust) on the stator components, and extend the stator's lifespan; in addition, the complete injection-molded shielding layer can also optimize the motor's sealing performance, further block the path of eddy current generation, reduce eddy current losses, and improve the motor's heat dissipation effect.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, the outer ring of the sliding bearing 32 is tightly embedded in the injection-molded permanent magnet rotor 31, ensuring that the sliding bearing 32 rotates synchronously with the rotor, avoiding additional friction caused by relative sliding between the two, reducing energy loss, and ensuring the coaxiality of the bearing and the rotor, avoiding increased wear caused by bearing misalignment. The inner ring of the sliding bearing 32 is clearance-fitted with the shaft 41, with a small gap reserved. On the one hand, it allows a small amount of relative rotation space between the shaft 41 and the bearing, reducing frictional resistance; on the other hand, the gap can store a small amount of chemical medium (as lubricant), forming a liquid lubricating film, improving the lubrication effect of the sliding bearing 32, and reducing the wear rate; at the same time, the gap can adapt to the thermal expansion and contraction of the shaft 41 due to heat generation during operation, preventing the shaft 41 from being deformed and damaged by the bearing due to expansion. Furthermore, the injection-molded permanent magnet rotor 31 and the impeller 13 are formed into an integral structure without splicing gaps through the same injection molding process.

[0030] It should be noted that, compared to "separate injection molding and splicing", this method further ensures the structural uniformity of the impeller 13 and the rotor, eliminates any splicing risks, improves the overall structural strength of the rotor (impact resistance, fatigue resistance), and is suitable for complex working conditions in chemical applications (such as media pressure fluctuations and frequent switching of working conditions).

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, the inner ring of the thrust ring 42 is clearance-fitted with the shaft 41, with a small clearance to allow slight axial expansion and contraction of the shaft 41 (due to temperature changes or fluctuations in medium pressure). This prevents the shaft 41 from generating additional stress due to rigid constraints, thus preventing deformation or breakage. At the same time, the clearance fit facilitates the installation and disassembly of the shaft 41, reducing the difficulty of maintenance. The outer ring of the thrust ring 42 is interference-fitted with the rear cover 23. The interference fit secures the thrust ring 42, ensuring that it does not shift when subjected to axial force. This provides a stable axial support reference for the shaft 41, preventing axial movement of the shaft 41 due to loosening of the thrust ring 42.

[0032] like Figure 1 and Figure 2 As shown, both the pump body inlet ring 12 and the impeller inlet ring 14 are made of, but not limited to, pressureless sintered silicon carbide. This material has the characteristics of high hardness (wear resistance), excellent corrosion resistance (resistance to most chemical media), and high temperature resistance (suitability for high temperature working conditions of chemical media). Compared with traditional metal or ordinary ceramic inlet rings, the service life is extended by 3-5 times, reducing media leakage and decreased conveying efficiency caused by inlet ring wear. In addition, there is an adaptation gap between the two.

[0033] Specifically, the gap size is precisely calculated to avoid both excessively large gaps that cause backflow of the medium between the impeller rings (reducing the pump's volumetric efficiency) and excessively small gaps that cause friction and collision between the impeller ring 14 and the pump body ring 12 during operation due to vibration or thermal expansion and contraction (causing damage to the rings and abnormal noise). This balances the "sealing effect" and "operational safety" to ensure long-term, efficient, and stable pump delivery.

[0034] like Figure 3 As shown, the surface of shaft 41 that mates with the inner ring of sliding bearing 32 is provided with a spiral groove.

[0035] Specifically, enhanced lubrication: When shaft 41 rotates, the spiral groove draws the chemical medium into the gap between shaft 41 and the inner ring of the bearing through the "pumping effect", forming a uniform and stable liquid lubricating film, which greatly reduces the direct friction between the two and reduces the wear rate (compared to the design without spiral grooves, the wear is reduced by more than 40%).

[0036] Auxiliary heat dissipation: The spiral groove can guide the medium to flow in the gap, and carry away the heat generated by friction with the medium, avoiding local overheating and damage to shaft 41 or bearings, which is especially suitable for high-speed operation.

[0037] Pressure balancing: The flowing medium can balance the pressure distribution between shaft 41 and bearing through the spiral groove, reduce local stress concentration caused by uneven pressure, reduce the vibration amplitude of shaft 41, and improve the operating stability of the pump.

[0038] Therefore, through the comprehensive solutions listed above, including integrated permanent magnet motor drive, a coupling-free structure where the motor shaft and pump shaft are integrated, an integrated injection-molded impeller and rotor assembly system, an integral injection-molded stator structure, and a fluoropolymer-lined injection-molded shielding layer replacing the metal shielding sleeve, the application scenarios of chemical canned motor pumps have been adapted and expanded, minimizing the risk of media leakage. Simultaneously, this approach is beneficial for reducing mass production costs, minimizing losses during motor and pump operation, and improving overall efficiency. Finally, the entire pump structure will be more compact, smaller in size, lighter in weight, and require less space.

[0039] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. An integrated leak-free chemical pump, characterized in that, It includes a pump component and a permanent magnet motor component. The pump component consists of a pump body (11), a pump body inlet ring (12), an impeller (13), and an impeller inlet ring (14). The pump body inlet ring (12) is tightly embedded in the pump body (11). The permanent magnet motor component consists of a stator component, a rotor component, and a support shaft component. The stator component includes a stator winding core (21), a base (22), and a rear cover (23). The base (22) is fixedly connected to the pump body (11). The stator winding core (21) is assembled in the inner ring of the base (22). The rear cover (23) is assembled at the tail end of the base (22). The gap between the stator winding core (21), the base (22), and the rear cover (23) is filled with an injection-molded shielding layer. The rotor component includes an injection-molded permanent magnet rotor (31) and a sliding bearing (32). The impeller mouth ring (14) is embedded in the impeller (13). The impeller (13) is sleeved on the outer ring of the sliding bearing (32). Both the impeller (13) and the injection-molded permanent magnet rotor (31) are integrally injection molded using, but not limited to, fluoroplastic particles. The support shaft component includes a shaft (41) and a thrust ring (42), with the thrust ring (42) and the sliding bearing (32) both fitted onto the outer ring of the shaft (41).

2. The integrated leak-free chemical pump according to claim 1, characterized in that, The injection-molded shielding layer covers the assembly gap and exposed end face of the stator winding core (21), the base (22) and the rear cover (23).

3. The integrated leak-free chemical pump according to claim 1, characterized in that, The outer ring of the sliding bearing (32) is tightly embedded in the injection-molded permanent magnet rotor (31), the inner ring of the sliding bearing (32) is clearance-fitted with the shaft (41), and the injection-molded permanent magnet rotor (31) and the impeller (13) are formed into an integral structure without splicing gaps through the same injection molding process.

4. The integrated leak-free chemical pump according to claim 1, characterized in that, The inner ring of the thrust ring (42) is clearance-fitted with the shaft (41), and the outer ring of the thrust ring (42) is interference-fitted with the rear cover (23).

5. The integrated leak-free chemical pump according to claim 1, characterized in that, The pump body inlet ring (12) and the impeller inlet ring (14) are both made of, but not limited to, pressureless sintered silicon carbide, and there is a fitting gap between them.

6. The integrated leak-free chemical pump according to claim 1, characterized in that, The surface of the shaft (41) that mates with the inner ring of the sliding bearing (32) is provided with a spiral groove.

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