A magnetic pump

Abstract

A first aspect of this invention provides a magnetic pump, comprising a drive motor, a pump body, and an impeller. The drive motor includes a stator and a rotor, with an inner magnetic rotor connected to one end of the rotor shaft. The drive motor is connected to a motor-pump cover, and the inner magnetic rotor is located within the inner cavity of the motor-pump cover. The pump body includes a bottom cover and a front cover. The bottom cover is connected to the motor-pump cover, and the front cover is connected to the bottom cover, forming a pump cavity. The front cover has an inlet and a spray nozzle, both of which communicate with the pump cavity. The impeller is located within the pump cavity and is driven to rotate by the inner magnetic rotor. Multiple blades are arranged on the side of the impeller facing the front cover. The impeller includes a plastic outer layer and a metal inner frame, which are integrally formed. The magnetic pump of this application uses an integrally formed impeller, with the plastic outer layer and the metal inner frame fixed together, facilitating assembly. It can even be made into a disposable consumable part, allowing for direct replacement, which is convenient and quick, and helps reduce production and maintenance costs.

Description

Technical Field

[0001] This invention belongs to the field of water pumps, and specifically relates to a magnetic pump. Background Technology

[0002] A magnetic drive pump is a type of pump that uses magnetic force to achieve leak-free, contactless rotary drive. The key feature of a magnetic drive pump is that it transmits torque through a magnetic field, eliminating the mechanical connection between the motor and the impeller and thus avoiding the leakage problems present in traditional water pumps.

[0003] For example, when a magnetic pump is used in a whirlpool, the pump sprays water from the inlet to the outlet to massage the skin. The motor of the magnetic pump is completely separate from the bathtub and never comes into contact with the water. Currently, the impeller used in magnetic pumps requires multiple parts to assemble, resulting in numerous production steps and high production and maintenance costs. Summary of the Invention

[0004] This invention provides a magnetic pump that aims to solve at least one of the technical problems existing in the prior art by adopting an integrated impeller structure to reduce costs.

[0005] An embodiment of the present invention provides a magnetic pump, comprising a drive motor, a pump body, and an impeller. The drive motor includes a stator and a rotor. One end of the rotor shaft is connected to an inner magnetic rotor. The drive motor is connected to a motor pump cover, and the inner magnetic rotor is located in the inner cavity of the motor pump cover. The pump body includes a bottom cover and a front cover. The bottom cover is connected to the motor pump cover, and the front cover is connected to the bottom cover, forming a pump cavity. The front cover is provided with a water inlet and a water spray outlet, both of which are connected to the pump cavity. The impeller is located in the pump cavity and is driven to rotate by the inner magnetic rotor. The impeller has multiple blades on the side facing the front cover. The impeller includes a plastic outer layer and a metal inner frame, which are integrally formed.

[0006] The magnetic pump according to this application has at least the following beneficial effects: When the magnetic pump is running, the drive motor starts, and the rotor drives the inner magnetic rotor to rotate. This, through the motor cover, is magnetically attracted to the impeller, causing it to rotate. The impeller's rotation creates negative pressure in the pump chamber due to centrifugal force. External water is drawn into the pump chamber through the inlet and propelled by the impeller blades to be ejected from the nozzle, providing a massaging water flow. The motor cover and bottom cover separate the drive motor from the pump body, preventing water from leaking into the drive motor and thus preventing leakage or malfunction. The magnetic pump of this application uses an integrated impeller structure, with the plastic outer layer and metal inner frame fixed together, facilitating assembly. It can even be made as a disposable consumable part, allowing for direct replacement, which is convenient and quick, helping to reduce production and maintenance costs and bringing convenience to users.

[0007] According to some embodiments of the present invention, the metal inner frame includes an iron sheet and an aluminum sheet, wherein the aluminum sheet is located between the iron sheet and the motor pump cover.

[0008] According to some embodiments of the present invention, the metal inner frame is a circular sheet structure, and the plastic outer layer covers one end face and the circumferential side face of the metal inner frame.

[0009] According to some embodiments of the present invention, the bottom cover is provided with a central shaft located in the pump chamber, and the end face of the metal inner frame opposite to the blade is provided with a shaft hole that matches the central shaft.

[0010] According to some embodiments of the present invention, the bottom cover is provided with a surrounding plate that surrounds the impeller and forms a circular groove to define the impeller.

[0011] According to some embodiments of the present invention, the bottom cover is provided with an axially protruding guide plate, the guide plate corresponds one-to-one with the water spray nozzle, the guide plate is arranged on the outer periphery of the enclosure and abuts against the enclosure, and the height of the guide plate is set to gradually decrease in the direction away from the enclosure.

[0012] According to some embodiments of the present invention, the water inlet is located at the center of the front cover, the water spray nozzles are at least two and are evenly distributed around the water inlet circumferentially, and the water inlet includes a plurality of through holes arranged in a double ring.

[0013] According to some embodiments of the present invention, the impeller has five blades, which are circumferentially distributed and form a cavity at the center of the five blades.

[0014] According to some embodiments of the present invention, the end face of the motor pump cover is provided with a plurality of positioning holes, the plurality of positioning holes being evenly distributed circumferentially along the axis of the rotor, and the bottom cover is provided with positioning pins that cooperate with the positioning holes.

[0015] According to some embodiments of the present invention, the outer periphery of the bottom cover is provided with a plurality of positioning portions, the front cover is provided with a perimeter surrounding the bottom cover, the perimeter is provided with a notch that matches the positioning portions, the positioning portions are provided with a protruding limiting portion, and the limiting portion abuts against the outer wall surface of the perimeter.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1This is a cross-sectional view of a magnetic pump according to some embodiments of the present invention; Figure 2 This is a top view of the pump body in some embodiments of the present invention; Figure 3 This is a front view of the connection between the pump body and the motor / pump cover in some embodiments of the present invention; Figure 4 This is an exploded view of the pump body and motor / pump cover in some embodiments of the present invention. Figure 1 ; Figure 5 This is an exploded view of the pump body and motor / pump cover in some embodiments of the present invention. Figure 2 .

[0018] Explanation of reference numerals in the attached figures: Drive motor 100, stator 110, rotor 120, rotating shaft 121, inner magnetic rotor 130, motor pump cover 140, positioning hole 141, pump body 200, bottom cover 210, central shaft 211, surrounding plate 212, guide plate 213, positioning column 214, positioning part 215, limiting part 216, front cover 220, water inlet 221, water spray nozzle 222, surrounding edge 223, notch 224, impeller 300, plastic outer layer 301, metal inner frame 302, shaft hole 303, blade 310. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of these terms in this invention based on the specific content of the technical solution. In the description of this invention, references to terms such as "one embodiment," "some embodiments," "illustrator embodiments," "examples," "specific examples," or "some examples" indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrator embodiments," "examples," "specific examples," or "some examples" indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0023] Reference Figures 1 to 5 This application proposes a magnetic pump, including a drive motor 100, a pump body 200, and an impeller 300. The drive motor 100 serves as the power source for the magnetic pump and its structure includes a stator 110 and a rotor 120. The stator 110 is fixedly installed inside the housing of the drive motor 100, and the rotor 120 is disposed inside the stator 110. When the coil winding of the stator 110 is energized, it generates a rotating magnetic field to drive the rotor 120 to rotate. One end of the shaft 121 of the rotor 120 is connected to an inner magnetic rotor 130, which rotates together with the rotor 120. One end of the drive motor 100 is provided with a motor pump cover 140, and the inner magnetic rotor 130 is disposed in the inner cavity of the motor pump cover 140. The motor pump cover 140 protects the inner magnetic rotor 130 and isolates it from the outside environment, ensuring that the electrical components of the drive motor 100 do not have any direct contact with external water, thus fundamentally eliminating the possibility of water entering the motor and causing leakage or short circuit.

[0024] The pump body 200 includes a bottom cover 210 and a front cover 220. One end of the bottom cover 210 is connected to the motor pump cover 140, and the connection method can be a threaded connection, a snap-fit ​​connection, etc., to ensure the reliability of the connection. The other end of the bottom cover 210 is connected to the front cover 220, and the front cover 220 and the bottom cover 210 together form the pump chamber. The front cover 220 is provided with a water inlet 221 and a water spray nozzle 222. The water inlet 221 is used to introduce external water into the pump chamber, and the water spray nozzle 222 is used for drainage. The water spray nozzle 222 can be designed as a converging nozzle to generate a concentrated massage water flow, or it can be designed as a diffuser nozzle to generate a large area of ​​gentle water flow. The inner wall of the front cover 220 is usually designed as a smooth arc-shaped surface to reduce the frictional resistance of the water flow in the pump chamber and improve hydraulic efficiency.

[0025] The impeller 300 is located inside the pump chamber and is driven to rotate by the inner magnetic rotor 130 through magnetic force. When the drive motor 100 starts, the rotor 120 drives the inner magnetic rotor 130 to rotate. The magnetic field of the inner magnetic rotor 130 passes through the motor pump cover 140 and the bottom cover 210, and the impeller 300 rotates with the inner magnetic rotor 130 under the action of magnetic force. Multiple blades 310 are provided on the side of the impeller 300 facing the front cover 220. The blades 310 are arranged along the radial direction of the impeller 300. The number of blades 310 can be set to three, four, five or more according to actual needs. The shape of the blades 310 can be arc-shaped blades, straight blades or backward-curved blades, etc. Different blade shapes and numbers will affect the flow rate and head of the magnetic pump. When the impeller 300 rotates, water moves from the center of the impeller 300 to the outer edge under the action of centrifugal force, thereby forming a negative pressure zone in the central area of ​​the impeller 300, continuously drawing in water from the inlet 221, and forming a high pressure zone in the outer edge area of ​​the impeller 300, which sprays water out at high speed from the nozzle 222.

[0026] The impeller 300 includes a plastic outer layer 301 and a metal inner frame 302, which are integral structures, such as using an integral injection molding process, where the plastic outer layer 301 wraps around the metal inner frame 302, or they are pre-assembled as a single unit. Specifically, the metal inner frame 302, as the skeleton structure of the impeller 300, is usually made of metal to cooperate with the inner magnetic rotor 130. The metal inner frame 302 can be provided with slots or blocks for engaging with the plastic outer layer 301. During the injection molding process, the metal inner frame 302 is pre-placed in the injection mold, and then liquid plastic raw material is injected into the mold. Under high temperature and pressure, the plastic raw material fills the mold cavity and wraps around the metal inner frame 302. After cooling and solidification, the plastic outer layer 301 and the metal inner frame 302 are tightly bonded together, which helps to eliminate loosening, delamination, or gaps between the two.

[0027] The integrated impeller 300 offers several advantages: First, it simplifies assembly. During assembly, the impeller 300 is simply inserted into the pump chamber, simplifying the process and reducing costs compared to impellers composed of multiple parts. Second, because the impeller 300 is a composite structure of plastic and metal, the outer plastic layer 301, which is in direct contact with water, exhibits excellent corrosion resistance and is not prone to aging or damage even in environments with prolonged exposure to chlorinated or hot water. The inner metal frame 302 provides sufficient structural strength, ensuring that the impeller 300 will not deform or be damaged during high-speed rotation. Furthermore, the impeller 300 can be designed as a disposable consumable. When wear, blade deformation, or performance degradation occurs after prolonged use, users do not need to repair or disassemble the impeller 300 for cleaning. Instead, the entire impeller 300 can be removed from the pump chamber and replaced with a new one. The entire replacement process is simple and quick, typically taking only a few minutes, reducing maintenance costs and providing convenience for users.

[0028] In specific applications, magnetic pumps can be used in massage bathtubs, foot baths, or spa equipment. During operation, the drive motor 100 starts, and the rotor 120 drives the inner magnetic rotor 130 to rotate, thereby causing the impeller 300 to rotate at high speed within the pump chamber. As the impeller 300 rotates, its multiple blades 310 generate centrifugal force on the water in the pump chamber. Under the action of centrifugal force, the water moves from the center of the impeller 300 to the outer edge, creating a negative pressure in the central region of the impeller 300. External water is continuously drawn into the pump chamber through the inlet 221 on the front cover 220. The drawn-in water gains kinetic and pressure energy under the pushing force of the blades 310, and is then ejected at high speed from the spray nozzle 222 on the front cover 220, forming a massage water flow with a certain pressure and speed, producing a massage effect on the human skin. Because the drive motor 100 is completely isolated from the pump chamber by the motor-pump cover 140, water in the pump chamber will not leak into the drive motor 100, ensuring extremely high safety.

[0029] In some embodiments, the inner metal frame 302 is made of iron and aluminum sheets, with the aluminum sheets located on the side closest to the motor pump cover 140. The iron sheets can be attracted by the magnetic force of the inner magnetic rotor 130. At the same time, iron sheets are low in cost and widely available, which helps to reduce the overall manufacturing cost of the impeller 300, while the aluminum sheets serve as a separator.

[0030] In some embodiments, the metal inner frame 302 is a circular sheet structure, and the plastic outer layer 301 completely covers the metal inner frame 302. The plastic outer layer 301 and the metal inner frame 302 are integrally injection molded, resulting in a tighter bond. The plastic outer layer 301 can protect the metal inner frame 302 and reduce the risk of corrosion.

[0031] In other embodiments, the metal inner frame 302 is also a circular sheet structure, with the plastic outer layer 301 covering one end face and the circumferential side of the metal inner frame 302 to prevent the metal inner frame 302 from detaching from the plastic outer layer 301. This results in the metal inner frame 302 being surrounded by the plastic outer layer 301 on three sides, with the remaining side being an exposed aluminum sheet.

[0032] Furthermore, the bottom cover 210 is provided with a central shaft 211 located in the pump chamber, and the end face of the metal inner frame 302 opposite to the blade 310 is provided with a shaft hole 303 that mates with the central shaft 211. The central shaft 211 can directly mate with the shaft hole 303, or it can be connected to a bearing or bushing to support the rotation of the impeller 300. The metal inner frame 302 has a shaft hole 303, the inner diameter of which matches the outer diameter of the central shaft 211. The two can be in a clearance fit, allowing the impeller 300 to be fitted onto the central shaft 211 and rotate freely. The setting of the shaft hole 303 constrains the radial position of the impeller 300 in the pump chamber. The impeller 300 can only rotate around the central shaft 211 and cannot be radially offset, ensuring the accurate position between the impeller 300 and the front cover 220, and avoiding vibration, increased noise, or collision caused by the eccentricity of the impeller 300. The central shaft 211 can be made of stainless steel, which has good wear resistance and corrosion resistance.

[0033] Understandably, a surrounding plate 212 is provided on the bottom cover 210. The surrounding plate 212 is annular and surrounds the impeller 300, forming a circular groove to constrain the impeller 300. The surrounding plate 212 extends upward from the bottom surface of the bottom cover 210. The height of the surrounding plate 212 is slightly greater than the thickness of the impeller 300, and the inner diameter of the surrounding plate 212 is slightly greater than the outer diameter of the impeller 300, forming a circular gap between them. This gap is filled with pressurized water, partially functioning as a bushing. The surrounding plate 212 and the bottom cover 210 can be integrally formed, or it can be fixed to the bottom cover 210 by means of snap-fit ​​or bolt connection. The circular groove formed by the surrounding plate 212 provides radial limiting and positioning for the impeller 300, ensuring that the impeller 300 remains in the center position of the pump cavity during rotation.

[0034] Understandably, the bottom cover 210 is also provided with axially protruding guide plates 213, which correspond one-to-one with the spray nozzles 222. The guide plates 213 are arranged on the outer periphery of the enclosure 212 and abut against the enclosure 212. The height of the guide plates 213 is set to gradually decrease in the direction away from the enclosure 212. The number of guide plates 213 is the same as the number of spray nozzles 222, with each guide plate 213 facing one spray nozzle 222, used to guide the high-pressure water flow discharged from the impeller 300 to the corresponding spray nozzle 222. The guide plates 213 and the enclosure 212 directly form a guide channel, guiding the water flow to the spray nozzle 222. The wall of the guide channel is a curved arc surface to reduce water flow resistance.

[0035] Reference Figure 2 The water inlet 221 is located at the center of the front cover 220, and there are at least two water nozzles 222 evenly distributed around the water inlet 221. The water inlet 221 includes multiple through holes arranged in a double ring. The water inlet 221, located at the center of the front cover 220, works in conjunction with the negative pressure zone at the center of the impeller 300, causing water to flow evenly from all sides towards the center, improving water intake efficiency. The at least two water nozzles 222, evenly distributed around the water inlet 221, create a uniform massage water flow, providing a uniform massage effect to the body. The water inlet 221 includes multiple through holes arranged in a double ring, with multiple through holes on both the inner and outer rings. This double-ring arrangement increases the effective water intake area of ​​the water inlet 221, allowing it to draw in more water under the same water pressure difference, thus increasing the pump's flow rate. Meanwhile, the double-ring arrangement can make the water intake more uniform, avoiding uneven water flow and unbalanced force on the impeller 300 caused by single-ring water intake. A removable filter screen can also be installed at the water inlet 221 to filter out impurities such as hair and debris in the water, preventing impurities from entering the pump cavity and jamming the impeller 300 or clogging the flow channel.

[0036] Reference Figure 4 The impeller 300 has five blades 310, which are evenly distributed circumferentially, and a cavity is formed in the center of each blade 310. Compared with impellers 300 with three or four blades 310, the five-blade impeller 300 can generate more uniform pulsating pressure at the same rotational speed, with smaller pulsation amplitude and a more stable and continuous water flow, which is beneficial to improving the comfort of the massage water flow. In the central region of the five blades 310, because the blades 310 extend outward from the center, the roots between the blades 310 are not completely closed, thus naturally forming a cavity in the center of the five blades 310. The cavity is aligned with the water inlet 221. When the impeller 300 rotates, the water in the cavity is thrown out under the action of centrifugal force, forming a low-pressure zone in the center of the cavity. Under the action of the pressure difference, the external water is drawn in from the water inlet 221 and then pushed outward by the blades 310.

[0037] Reference Figure 4 and Figure 5 In some embodiments, the end face of the motor pump cover 140 is provided with multiple positioning holes 141, which are evenly distributed circumferentially along the axis of the rotor 120. The bottom cover 210 is provided with positioning pins 214 that mate with the positioning holes 141. During assembly, the positioning pins 214 of the bottom cover 210 are inserted into the positioning holes 141 of the motor pump cover 140 to achieve positioning. The bottom cover 210 is fixed by using the magnetic attraction of the inner magnetic rotor 130 to hold the metal inner frame 302. Of course, bolts or other fasteners can also be used to assist in fixing the bottom cover 210.

[0038] Furthermore, multiple positioning portions 215 are protruding from the outer circumferential surface of the bottom cover 210. The positioning portions 215 are evenly distributed along the circumference of the bottom cover 210, and each positioning portion 215 is further provided with a protruding limiting portion 216. The lower end of the front cover 220 is provided with a perimeter 223, which surrounds the outer circumference of the bottom cover 210, and the perimeter 223 and the bottom cover 210 form a mating relationship. A notch 224 is provided on the perimeter 223. The position and size of the notch 224 are matched with the positioning portions 215 on the bottom cover 210. During assembly, the notch 224 on the perimeter 223 is aligned with the positioning portion 215 on the bottom cover 210 and inserted, so that the positioning portion 215 is locked in the notch 224, achieving precise positioning of the front cover 220 and the bottom cover 210. Alternatively, the positioning portion 215 and the notch 224 can be designed as an interference fit to fix the front cover 220. The limiting part 216 abuts against the outer wall surface of the surrounding edge 223, thereby restricting the displacement of the front cover 220. The limiting part 216 can also be designed as an elastic buckle structure, and the outer wall surface of the surrounding edge 223 can be provided with a groove or a stop that cooperates with the limiting part 216 to further fix the front cover 220.

[0039] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A magnetic pump, characterized in that, include: A drive motor, comprising a stator and a rotor, wherein one end of the rotor shaft is connected to an inner magnetic rotor, the drive motor is connected to a motor pump cover, and the inner magnetic rotor is located in the inner cavity of the motor pump cover; The pump body includes a bottom cover and a front cover. The bottom cover is connected to the motor pump cover, and the front cover is connected to the bottom cover and forms a pump chamber. The front cover is provided with a water inlet and a water spray nozzle, and both the water inlet and the water spray nozzle are connected to the pump chamber. An impeller is located inside the pump chamber and is driven to rotate by the internal magnetic rotor. The impeller has multiple blades on the side facing the front cover. The impeller includes a plastic outer layer and a metal inner frame, which are integral structures.

2. The magnetic pump according to claim 1, characterized in that, The metal inner frame includes iron sheets and aluminum sheets, with the aluminum sheets located between the iron sheets and the motor pump cover.

3. The magnetic pump according to claim 2, characterized in that, The inner metal frame is a circular, thin sheet structure, and the outer plastic layer covers one end face and the circumferential side of the inner metal frame.

4. The magnetic pump according to claim 3, characterized in that, The bottom cover is provided with a central shaft located in the pump chamber, and the end face of the metal inner frame opposite to the blade is provided with a shaft hole that matches the central shaft.

5. The magnetic pump according to claim 4, characterized in that, The bottom cover is provided with a surrounding plate, which surrounds the impeller and forms a circular groove to define the impeller.

6. The magnetic pump according to claim 5, characterized in that, The bottom cover is provided with an axially protruding guide plate, which corresponds one-to-one with the water spray nozzle. The guide plate is arranged on the outer periphery of the enclosure and abuts against the enclosure. The height of the guide plate is set to gradually decrease in the direction away from the enclosure.

7. The magnetic pump according to claim 1, characterized in that, The water inlet is located at the center of the front cover, and there are at least two water spray nozzles that are evenly distributed around the water inlet. The water inlet includes multiple through holes arranged in a double ring.

8. The magnetic pump according to claim 7, characterized in that, The impeller has five blades, which are evenly distributed circumferentially, and a cavity is formed at the center of each blade.

9. The magnetic pump according to claim 1, characterized in that, The end face of the motor pump cover is provided with a plurality of positioning holes, which are evenly distributed circumferentially along the axis of the rotor, and the bottom cover is provided with positioning pins that cooperate with the positioning holes.

10. The magnetic pump according to claim 9, characterized in that, The bottom cover has multiple positioning parts on its outer periphery, and the front cover has a rim surrounding the bottom cover. The rim has a notch that matches the positioning parts, and the positioning parts have a protruding limiting part that abuts against the outer wall surface of the rim.

Images