A brushless submersible pump

Abstract

This utility model discloses a brushless submersible pump, including a first housing and a drive device installed inside the first housing. The first housing has an outlet at its upper end and an inlet at its lower end. The drive device includes a second housing, a brushless drive assembly, and an impeller. The second housing is embedded within the first housing and fixedly connected to it. The gap between the second and first housings forms a water flow channel. The brushless drive assembly is installed inside the second housing. The impeller is located at the end of the second housing near the inlet and is driven and connected to the output end of the brushless drive assembly. A sealing assembly is provided inside the second housing at the output end of the brushless drive assembly to prevent water from entering the second housing. This utility model's technical solution allows the brushless water pump to be better used in water pumps, reducing noise, increasing water flow, extending service life, and reducing the lateral diameter.

Description

Technical Field

[0001] This utility model relates to the field of water pumps, and in particular to a brushless submersible pump for pumping machines. Background Technology

[0002] Currently, most wine dispensers use diaphragm pumps. However, diaphragm pumps are noisy (generally 50-70 decibels), especially at night, easily disturbing others' rest and causing disturbance in public places such as offices. Furthermore, diaphragm pumps have low efficiency and low flow rate, typically around 1L / min, with some reaching 1.5L / min. This results in long filling times for users; a 300ml cup of water requires waiting 15 seconds.

[0003] Currently, some submersible pumps use brushed motors in their alcohol extraction devices. However, the brushed motor's shaft runs through the entire motor, making it impossible to completely seal the area around the shaft for waterproofing. When the submersible pump is submerged in water, water can enter the motor, causing a short circuit and damage, resulting in a very short lifespan. Furthermore, the motor's casing, rotor, magnets, and other materials cannot be made rust-proof. Once water gets in, rust spots can contaminate water sources, especially drinking water and beverages, threatening users' health.

[0004] In addition, the current brushless submersible pumps for aquariums on the market have water outlets on the side, making it impossible to pump water vertically from bottom to top. The water pipes are also connected from the side of the aquarium pump, resulting in a large diameter in the horizontal direction. This makes the brushless submersible pumps for aquariums bulky and unable to accommodate the small diameter of bottled or barrelled water bottles. Many bottles cannot be put in, making them unsuitable for use as water pumps. Utility Model Content

[0005] The main purpose of this utility model is to propose a brushless submersible pump, which aims to solve the technical problems of existing pumps such as low flow rate, high noise, large diameter and volume, poor sealing and short life.

[0006] To achieve the above objectives, this utility model proposes a brushless submersible pump, comprising a first housing and a drive device installed inside the first housing. The first housing has an outlet at its upper end and an inlet at its lower end. The drive device includes a second housing, a brushless drive assembly, and an impeller. The second housing is embedded in the first housing and fixedly connected to the first housing. The gap between the second housing and the first housing forms a water flow channel. The brushless drive assembly is installed inside the second housing. The impeller is located at the end of the second housing near the inlet and is driven and connected to the output end of the brushless drive assembly. A sealing assembly is provided inside the second housing at the output end of the brushless drive assembly to prevent water from entering the interior of the second housing.

[0007] This invention achieves sealing of the brushless drive component by sealing it inside the second housing. The drive impeller draws water in from the inlet and then discharges it from the outlet through the water flow channel between the first and second housings. Meanwhile, the submersible pump is placed at the bottom of the bottle to pump water, which isolates noise to a certain extent and increases the water flow rate compared to a diaphragm pump.

[0008] Preferably, the brushless drive assembly includes an annular coil core, a cylindrical magnet, a rotating shaft, and a fixed shaft. The annular coil core is fixedly installed on the inner wall of the second housing. The fixed shaft is inserted into the annular coil core and fixedly connected to the second housing. The cylindrical magnet is sleeved on the fixed shaft and rotatably connected to the circular fixed seat. The rotating shaft is fixedly connected to the end of the cylindrical magnet near the water inlet. The end of the rotating shaft away from the cylindrical magnet is inserted into the outside of the second housing and fixedly connected to the impeller.

[0009] Preferably, a third housing is further provided inside the second housing. The third housing is inserted into the annular coil core and fixedly connected to the inner wall of the second housing. The end of the third housing near the water inlet is sealed to the inner wall of the second housing. One end of the fixed shaft is fixedly connected to the upper inner wall of the third housing. The columnar magnet is installed inside the third housing and rotatably connected to the fixed shaft. The rotating shaft is inserted to the outside of the second housing and fixedly connected to the impeller.

[0010] Preferably, the gap between the second housing and the third housing is sealed with glue to seal the electrical components installed between the second housing and the third housing, thereby achieving water resistance.

[0011] Preferably, the sealing assembly includes a sealing element, the sealing element having an oil cavity in the middle for sealing, and the drive end of the brushless drive assembly passing through the sealing element and the oil cavity and inserted into the outside of the second housing to be fixedly connected to the impeller.

[0012] Preferably, the second housing has a wiring port at one end near the water outlet, a motor wire is inserted into the wiring port, and a circuit board is installed inside the second housing near the wiring port, and the motor wire is electrically connected to the circuit board.

[0013] Preferably, the impeller includes a plurality of blades and a circular fixed seat. Each blade is provided with an arc-shaped guide portion. The center of one end of the circular fixed seat is provided with a groove that matches the drive end of the brushless drive assembly. The blades are evenly arranged along the periphery of the fixed seat and the arc-shaped guide portions are all arranged clockwise.

[0014] Preferably, the first housing is provided with a plurality of support columns at one end of the water inlet.

[0015] Preferably, the upper end of the first housing is provided with a water pump cover, the water outlet is provided on the water pump cover, and the water pump cover is detachably connected to the first housing.

[0016] The technical solution of this utility model has the following beneficial effects: By sealing the brushless drive component inside the second housing, the brushless drive component is sealed. The drive impeller draws water in from the inlet and then discharges it from the outlet through the water flow channel between the first and second housings. Compared with diaphragm pumps, the brushless drive component reduces noise to a certain extent. At the same time, the submersible pump draws water by placing it at the bottom of the bottle, and the water in the bottle isolates the sound, greatly reducing noise. It also increases the water flow rate compared with diaphragm pumps. Furthermore, the electrical parts of the drive device are sealed with glue, preventing water contact. Compared with traditional submersible pumps, this greatly extends the service life of the pump. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a brushless submersible pump according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the brushless drive assembly structure of a brushless submersible pump according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the third housing structure of a brushless submersible pump according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the impeller structure of a brushless submersible pump according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the first housing structure of a brushless submersible pump according to an embodiment of the present invention; Figure 6 This is a cross-sectional view of the overall structure of a brushless submersible pump according to an embodiment of the present invention.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0020] Reference numerals in the attached figures: 1. First housing; 2. Outlet; 3. Inlet; 4. Second housing; 5. Brushless drive assembly; 6. Sealing assembly; 7. Impeller; 8. Motor wire; 9. Circuit board; 10. Wiring port; 11. Pump cover; 12. Support column; 41. Third housing; 51. Annular coil core; 52. Columnar magnet; 53. Fixed shaft; 54. Rotating shaft; 61. Seal; 62. Oil chamber; 71. Circular fixed seat; 72. Blade; 73. Arc-shaped guide. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] This utility model proposes a brushless submersible pump.

[0025] like Figure 1 As shown, in one embodiment of this utility model, a brushless submersible pump includes a first housing 1 and a drive device installed inside the first housing 1. The first housing 1 has an outlet 2 at its upper end and an inlet 3 at its lower end. The drive device includes a second housing 4, a brushless drive assembly 5, and an impeller 7. The second housing 4 is embedded in the first housing 1 and fixedly connected to the first housing 1. The gap between the second housing 4 and the first housing 1 forms a water flow channel. The brushless drive assembly 5 is installed inside the second housing 4. The impeller 7 is located at one end of the second housing 4 near the inlet 3 and is driven and connected to the output end of the brushless drive assembly 5. A sealing assembly 6 is provided inside the second housing 4 at the output end of the brushless drive assembly 5 to prevent water from entering the interior of the second housing 4.

[0026] Among them, the brushless drive component 5 is a brushless motor; the sealing component 6 can be a rubber sealing ring or a sealing silicone, which is not limited here. The rotating shaft 54 ​​of the brushless motor passes through the sealing silicone and is connected to the impeller 7; the second housing 4 is fixedly connected to the first housing 1 by bolts, or the first and second housings 4 can be integrally injection molded. The first housing 1 and the second housing 4 are fixed together by support strips.

[0027] In this embodiment, the brushless drive assembly 5 is sealed inside the second housing 4, thus achieving a seal for the brushless drive assembly 5. The drive impeller 7 draws water in from the inlet 3 and then discharges the water from the outlet 2 through the water flow channel that connects the first and second housings 4. Compared to a diaphragm pump, the brushless drive assembly 5 reduces noise to a certain extent. Meanwhile, the submersible pump draws water by placing it at the bottom of the bottle, and the water in the bottle isolates the sound, greatly reducing noise. At the same time, it increases the water flow rate compared to a diaphragm pump, and compared to an aquarium pump, it has a smaller lateral diameter, making it suitable for smaller diameter bottled or barrelled water bottles.

[0028] Furthermore, the first housing 1 and the second housing 4 can be made of high-strength, corrosion-resistant engineering plastics, such as nylon (PA), polycarbonate (PC), PP, etc., to adapt to the underwater working environment and ensure structural strength. Injection molding is used, or stainless steel can be used as the housing material. The outlet 2 is located at the upper end of the first housing 1, and is set by injection molding (plastic material) or drilling / tapping (metal material). To facilitate water pipe connection, the outlet 2 can be designed as a threaded interface or quick connector. The inlet 3 is located at the lower end of the first housing 1, and is also set using the same process. The size of the inlet 3 is usually slightly larger than the outlet 2 to ensure smooth water flow and prevent reduced pump efficiency due to poor water intake. The shape of the second housing 4 is not limited, but it must ensure that there is sufficient space between it and the inner wall of the first housing 1 for water to flow from the inlet 3 to the outlet 2. Positioning protrusions or grooves are provided on the surface of the second housing 4 to connect with the first housing. The corresponding structure of the inner wall is matched to ensure accurate installation position. It is fixedly connected to the first housing 1 by means of adhesive bonding, screw fixing or ultrasonic welding. The brushless drive assembly 5 mainly includes a brushless motor, driver and control circuit board 9. The brushless motor is selected according to the working requirements of the submersible pump. The rated power, speed and other parameters of the motor are determined according to the power requirements of the pump. A DC brushless motor can be used. The driver is used to control the operation of the brushless motor. The control circuit board 9 realizes the control of the driver, including the motor start, stop, speed adjustment and other functions. The brushless motor is installed in a specific position inside the second housing 4. The stator of the motor is fixed to the inner wall of the second housing 4 by interference fit or screws. The rotor is connected to the motor shaft and can rotate freely. The driver and control circuit board 9 can be integrated into a module and fixed in a suitable position inside the second housing 4 by screws or buckles to ensure good electrical connection with the brushless motor, and waterproof treatment is done. The connection line uses waterproof cable, and the cable joint is sealed with waterproof sealant; the impeller 7 is designed according to the pump's flow rate and head requirements, and usually adopts centrifugal impeller 7. It is made of wear-resistant and corrosion-resistant plastic materials, such as polypropylene (PP) or high-performance engineering plastics, and is manufactured by injection molding process.The shape, number, and angle of the blades 72 of the impeller 7 are optimized to improve the pumping efficiency. The impeller 7 is installed at the end of the second housing 4 near the inlet 3 and is driven to the output end (motor shaft) of the brushless drive assembly 5. Matching keyways are machined at the center holes of the motor shaft and the impeller 7, and the key connection ensures reliable transmission between the two, preventing relative sliding between the impeller 7 and the motor shaft during rotation. An appropriate gap is maintained between the impeller 7 and the second housing 4, generally 0.5-1mm, to ensure that the impeller 7 can rotate freely while preventing excessive gap from causing water leakage and reduced efficiency. To prevent water from entering the interior of the second housing 4 and damaging the brushless drive assembly 5, the sealing assembly includes O-rings, and the materials can be nitrile rubber (NBR), fluororubber (FKM), or silicone rubber (VMQ). Alternatively, sealing silicone can be used. It is essential to ensure that the O-ring meets food-grade standards. The O-ring is manufactured according to the design dimensions using injection molding or compression molding, ensuring a cavity is formed in the center for oil sealing. Food-grade grease is injected into the cavity through a dedicated oil injection hole to form an oil chamber. Holes are made at both ends of the cavity for the output end (motor shaft) of the brushless drive assembly 5 to pass through, thus preventing water ingress. At the lower end of the second housing, a groove matching the outer diameter of the sealing silicone is machined using machining methods (such as milling or turning). The depth of the groove should ensure that after the O-ring is embedded, its surface is flush with or slightly lower (not exceeding 0.5mm) the lower end face of the second housing. To ensure a tight fit, a snap-fit ​​cover is installed at the lower end of the second housing to fix the O-ring seal. The snap-fit ​​cover is designed according to the structure of the second housing and the position of the sealing silicone component, and uses the same or compatible material as the second housing. For example, for plastic materials, the same engineering plastic as the second housing can be used, and for metal materials, stainless steel or aluminum alloy can be used. The shape of the snap-fit ​​cover should be able to completely cover the O-ring seal and form a tight snap-fit ​​with the lower end of the second housing. After the sealing silicone component is embedded in the groove, in order to increase the service life of the submersible pump in water and prevent water seepage, the electrical components in the second housing are potted and sealed. During potting, it must be ensured that the output end of the brushless drive assembly 5 does not affect the output.

[0029] Preferably, such as Figure 2 As shown, the brushless drive assembly 5 includes a ring coil core 51, a cylindrical magnet 52, a rotating shaft 54, and a fixed shaft 53. The ring coil core 51 is fixedly installed on the inner wall of the second housing 4. The fixed shaft 53 is inserted into the ring coil core 51 and fixedly connected to the second housing 4. The cylindrical magnet 52 is sleeved on the fixed shaft 53 and rotatably connected to the circular fixed seat 71. The rotating shaft 54 ​​is fixedly connected to the end of the cylindrical magnet 52 near the water inlet 3. The end of the rotating shaft 54 ​​away from the cylindrical magnet 52 is inserted into the outside of the second housing 4 and fixedly connected to the impeller 7.

[0030] The inner diameter of the toroidal coil core 51 is slightly larger than the outer diameter of the fixed shaft 53. A soft magnetic material with high permeability, such as silicon steel sheet, is selected and stamped into suitable toroidal sheets, which are then stacked together to form the toroidal coil core 51. This improves electromagnetic conversion efficiency and reduces hysteresis loss. The silicon steel sheets are stamped to ensure the dimensional accuracy of each toroidal sheet. During the stacking process, a special fixture is used to ensure the neat arrangement of the silicon steel sheets. After stacking, the silicon steel sheets are fixed together by welding or bonding to prevent loosening during use. An annular groove is opened at a corresponding position on the inner wall of the second housing 4. The outer diameter of the toroidal coil core 51 matches the inner diameter of the groove. The toroidal coil core 51 is embedded into the groove through an interference fit. To further ensure a firm fixation, a high-temperature resistant and waterproof adhesive is applied to the contact surface between the toroidal coil core 51 and the groove. After the adhesive cures, the toroidal coil core 51 is firmly fixed to the inner wall of the second housing 4. The fixed shaft 53 is made of a high-strength, corrosion-resistant metal material, such as stainless steel (e.g., 304 or 316). Stainless steel is used to ensure that it will not rust or be damaged during long-term use in an underwater environment. The machined fixed shaft 53 is inserted into one end of the annular coil core 51, so that it passes through the central hole of the annular coil core 51. The mounting hole is opened on the second housing 4 at the position corresponding to the fixed shaft 53. One end of the fixed shaft 53 is fixed to the second housing 4 by threaded connection or interference fit. The columnar magnet 52 is made of high-performance permanent magnet material, such as neodymium iron boron (NdFeB) magnet, which has the characteristics of high remanence, high coercivity and high magnetic energy product, and can provide a strong magnetic field for the brushless drive component 5. The neodymium iron boron material is machined into a columnar magnet 52, and the size is adapted to the annular coil core 51 and the fixed shaft 53.After processing, the cylindrical magnet 52 is magnetized to achieve the required magnetic field strength and pole distribution. The magnetization direction is determined according to the working principle of the brushless motor to ensure interaction with the magnetic field generated by the toroidal coil core 51, enabling normal motor operation. A high-precision bearing is installed in the central hole of the cylindrical magnet 52. The inner diameter of the bearing matches the outer diameter of the fixed shaft 53, using an interference fit to ensure that the cylindrical magnet 52 can rotate flexibly around the fixed shaft 53. The cylindrical magnet 52 with the bearing installed is then fitted onto the fixed shaft 53, keeping the cylindrical magnet 52 and the toroidal coil core 51 concentric. The radial clearance between them is controlled within 0.5-1mm. To avoid collisions during rotation, the rotating shaft 54 ​​is also made of high-strength, corrosion-resistant metal material, such as stainless steel, to withstand the torque and axial force during pump operation. The stainless steel bar undergoes turning and grinding processes to ensure that one end can be fixedly connected to the cylindrical magnet 52 and the other end to the impeller 7. The end connected to the cylindrical magnet 52 is machined with a shape matching the corresponding structure on the cylindrical magnet 52, such as a groove or thread. The end connected to the impeller 7 is machined with a keyway to ensure reliable transmission with the impeller 7 via a key connection. The rotating shaft 54 ​​is fixedly connected to the end of the cylindrical magnet 52 near the inlet 3. If a groove connection is used, the corresponding positions on the cylindrical magnet 52 and the rotating shaft 54 ​​are machined... The pump has a series of interlocking slots and blocks. The blocks are inserted into the slots and further secured with pins or bolts. If a threaded connection is used, matching threads are machined in the center hole of the columnar magnet 52 and the end of the rotating shaft 54. The connection is achieved by rotating and tightening. The end of the rotating shaft 54 ​​away from the columnar magnet 52 extends to the outside through a pre-drilled hole in the second housing 4 and connects with the impeller 7. A key is installed in the keyway at the end of the rotating shaft 54. A corresponding keyway is also machined in the center hole of the impeller 7. The impeller 7 is fitted onto the rotating shaft 54 ​​so that the key is inserted into the keyway of the impeller 7. Then, a nut or other locking device is used to fix the impeller 7 onto the rotating shaft 54 ​​to ensure that the impeller 7 and the rotating shaft 54 ​​rotate synchronously during the operation of the water pump and there is no relative displacement.

[0031] Preferably, such as Figure 3 and Figure 5 As shown, a third housing 41 is also provided inside the second housing 4. The third housing 41 is inserted into the annular coil core 51 and fixedly connected to the inner wall of the second housing 4. The end of the third housing 41 near the water inlet 3 is sealed to the inner wall of the second housing 4. One end of the fixed shaft 53 is fixedly connected to the upper inner wall of the third housing 41. A columnar magnet is installed inside the third housing 41 and rotatably connected to the fixed shaft 53. The rotating shaft 54 ​​is inserted to the outside of the second housing 4 and fixedly connected to the impeller 7. The third housing 41 completely separates the rotor of the electronic motor from the stator of the motor, and at the same time separates the circuit board 9 installed on the second housing 4, thus achieving a seal and preventing water from flowing from the rotor to the circuit board 9 and causing the circuit board 9 to short-circuit.

[0032] In this embodiment, the third housing 41 is designed as a cylindrical structure with one open end. Its outer diameter matches the inner diameter of the annular coil core 51. It is made of a material with good insulation, water resistance, and mechanical strength, such as high-performance engineering plastics (e.g., PEEK) or corrosion-resistant metal materials (e.g., stainless steel). An annular boss or groove for positioning the third housing 41 is provided on the inner wall of the second housing 4 at the position corresponding to the annular coil core 51. The third housing 41 is fixed to the inner wall of the second housing 4 by adhesive bonding or screw fixing. The upper inner wall of the third housing 41 has a matching groove, and a matching protrusion can be machined at the end of the fixing shaft 53, which is fixed inside the third housing 41 by interference fit or adhesive bonding. An annular sealing groove is provided on the outer wall of the third housing 41 near the water inlet 3, and an O-ring is installed in the groove. The sealing ring is made of water-resistant and aging-resistant rubber material, such as ethylene propylene diene monomer (EPDM) rubber. The inner diameter of the sealing ring is tightly fitted with the outer diameter of the third housing 41, and the outer diameter is slightly larger than the inner diameter of the corresponding position on the inner wall of the second housing 4. The seal is achieved by extrusion deformation. The center hole of the columnar magnet 52 and the outer diameter of the fixed shaft 53 are interference-fitted, with the interference amount controlled between 0.01 and 0.03 mm. To ensure that the columnar magnet 52 can rotate flexibly around the fixed shaft 53 with good concentricity, and to prevent the columnar magnet 52 from moving axially, shaft retaining rings or snap rings are installed at both ends of the columnar magnet 52 on the fixed shaft 53 to restrict the axial movement of the columnar magnet 52 and ensure its stable rotation within the third housing 41. One end of the rotating shaft 54 ​​is fixedly connected to the columnar magnet 52, and the rotating shaft 54 ​​is inserted into and glued to the columnar magnet 52. The other end extends through the pre-drilled holes in the third housing 41 and the second housing 4 to the outside and connect to the impeller 7. A sealing structure is also installed at the part where the rotating shaft 54 ​​passes through the third housing 41 and the second housing 4. For example, a mechanical seal or oil seal can be used to prevent water from entering the third housing 41 and the interior of the second housing 4 from this part; a keyway is machined at the end of the rotating shaft 54 ​​extending out of the second housing 4, and a corresponding keyway is also machined in the center hole of the impeller 7. The key is installed in the keyway of the rotating shaft 54, and then the impeller 7 is fitted onto the rotating shaft 54 ​​so that the key is embedded in the keyway of the impeller 7. Finally, a nut or other locking device is used to firmly fix the impeller 7 on the rotating shaft 54 ​​to ensure that the impeller 7 and the rotating shaft 54 ​​rotate synchronously when the water pump is running, so as to transmit power; the circuit board 9 is installed in the second housing 4 in a position away from the water inlet 3 and not easily affected by water, such as the upper part or side of the second housing 4. An insulating gasket is placed between the circuit board 9 and the inner wall of the second housing 4 to prevent the circuit board 9 from directly contacting the housing and causing a short circuit.

[0033] In addition to isolation via the third housing 41, the circuit board 9 can also be potted. A waterproof and insulating potting compound, such as silicone potting compound, is selected and evenly applied to the surface of the circuit board 9. After the potting compound cures, a protective coating is formed, further preventing water and moisture from corroding the circuit board 9 and improving the reliability and stability of the circuit board 9.

[0034] Preferably, the motor core, coil, and circuit board 9 are installed in the mounting space between the second housing 4 and the third housing 41. The gap between the second housing 4 and the third housing 41 is sealed with glue. The glue can be applied through the wiring port 10 to seal the electrical components of the drive device installed in the second housing, preventing the electrical components from contacting water and extending the service life of the submersible pump.

[0035] Preferably, the sealing assembly 6 includes a sealing element 61, with an oil cavity 62 for sealing in the middle. The drive end of the brushless drive assembly 5 passes through the sealing element 61 and the oil cavity 62 and is inserted into the outside of the second housing 4 and fixedly connected to the impeller 7. The sealing element 61 is made of sealing silicone. The lower end of the second housing 4 is provided with a groove that matches the sealing silicone and a snap-fit ​​cover. The sealing silicone is embedded in the groove. The snap-fit ​​cover snaps into the second housing 4 to fix the sealing silicone. The middle of the sealing silicone has a cavity, which is filled with food-grade grease to form the oil cavity 62, thereby further sealing the rotating shaft 54 ​​and preventing water from entering along the rotating shaft 54.

[0036] In this embodiment, a silicone seal and a grease seal are used at the magnet. The silicone seal 61 has an oil cavity 62, which is filled with hydrophobic food-grade grease. This double waterproofing measure prevents water from entering the magnet. At the same time, the fine powder generated by the rotation and friction of the magnet is also sealed by the silicone seal and grease, preventing it from overflowing and polluting the water source. The drive end of the brushless drive assembly 5 uses a 304 food-grade stainless steel shaft.

[0037] In one possible implementation, the second housing 4 is provided with a wiring port 10 near the water outlet 2. A motor wire 8 is inserted into the wiring port 10. A circuit board 9 is installed inside the second housing 4 near the wiring port 10. The motor wire 8 is electrically connected to the circuit board 9. Waterproofing is achieved by adjusting the internal potting density through the wiring port 10.

[0038] Preferably, such as Figure 4 As shown, the impeller includes several blades and a circular fixed seat. Each blade is provided with an arc-shaped guide portion. At the center of one end of the circular fixed seat, there is a groove that matches the drive end of the brushless drive assembly. The blades are evenly arranged along the periphery of the fixed seat and the arc-shaped guide portions are all arranged clockwise.

[0039] Specifically, the impeller 7 has 4 blades 72; the material is engineering plastic, such as polypropylene (PP) or nylon (PA), or metal, such as stainless steel; professional fluid dynamics design software (such as ANSYS CFX, Fluent, etc.) is used to simulate and analyze the arc-shaped guide part 73 of the blade 72. By adjusting the curvature, radius and angle with the rotation direction of the impeller 7, the streamline of the water flow is optimized to reduce water resistance. For example, through simulation analysis, the radius of curvature of the arc-shaped guide 73 is determined to be 10-20mm, and the angle between it and the rotation direction of the impeller 7 is between 30° and 45°. The circular fixing seat 71 is a disc-shaped structure with a mounting hole at its center that mates with the rotating shaft 54. The inner diameter of the mounting hole matches the outer diameter of the rotating shaft 54. It can be fixed to the rotating shaft 54 ​​by key connection or interference fit. On the circumferential surface of the circular fixing seat 71, mounting grooves or mounting holes corresponding to the number of blades 72 are evenly distributed for mounting the blades 72. Alternatively, the circular fixing seat 71 and the blades 72 can be integrally injection molded.

[0040] Preferably, the first housing 1 is provided with a plurality of support columns 12 at one end of the water inlet 3, which are used to lift the water inlet 3 to prevent the water inlet 3 from sticking to the bottom of the wine bottle and affecting the wine extraction effect, and to facilitate water entering the water inlet 3.

[0041] Preferably, the upper end of the first housing 1 is provided with a water pump cover 11, the water outlet 2 is provided on the water pump cover 11, the water pump cover 11 is detachably connected to the first housing 1, and the second housing 4 is snapped into the inner wall of the first housing, so that the water pump inside the second housing 4 can be easily removed for maintenance and inspection.

[0042] Optionally, the first housing 1 has arc-shaped inner walls on both sides of the impeller 7 for guiding water flow.

[0043] Optionally, the top of the second housing 4 is provided with a removable cover, and the wiring port 10 is located on the cover. The cover is snapped into the second housing 4 to facilitate the filling and sealing of the second housing 4 with glue.

[0044] In one possible implementation, the inlet 3 is equipped with a filter screen to prevent larger particles of impurities in the water from entering the pump body. The filter screen can be made of stainless steel wire mesh or plastic filter screen and is fixed to the lower end of the first housing 1 by clips or glue.

[0045] Specifically, the working principle and usage process of this utility model are as follows: By sealing the brushless drive assembly 5 inside the second housing 4, the brushless drive assembly 5 is sealed. The impeller 7 drives water to be drawn in from the inlet 3, and then the water is discharged from the outlet 2 through the water flow channel between the first housing 1 and the second housing 4. Compared with the diaphragm pump, the brushless drive assembly 5 reduces the transmission structure, and the impeller 7 and the magnet always maintain a high degree of concentric rotation, which reduces the generation of noise to a certain extent. In addition, the water pump is located at the bottom of the water, and water is a good sound insulation medium, so it can achieve ultra-quiet operation and greatly reduce noise. Even in the quiet of the night, it will not disturb others. At the same time, it increases the water flow rate compared with the diaphragm pump.

[0046] Furthermore, by using a potting sealant to seal nine parts, including the energized coil, iron core, and circuit board, the adhesive, once fully dried and hardened, completely isolates all internal components of the motor from water. The magnets and internal components such as the coil and iron core are completely kept out of contact, achieving complete waterproofing of the motor. Compared to current brushed submersible pumps, the electrical components of the drive unit are completely sealed with potting sealant, extending the service life of the submersible pump.

[0047] The motor directly drives the impeller 7 to rotate, eliminating the need for other unnecessary transmission structures and minimizing power loss. The unique impeller 7 design also significantly reduces water resistance, preventing a substantial decrease in rotational speed due to water resistance, which would otherwise reduce flow rate. As the impeller 7 rotates, centrifugal force drives water to flow around it. When the water impacts the circular arc surface of the pump casing, it is guided by the arc surface into the pipe. Simultaneously, because the water cup at the pump inlet 3 is drawn away from the impeller 7, a certain negative pressure is created, continuously and automatically replenishing the water flow to the impeller 7. This achieves vertical water pumping from bottom to top with high efficiency, realizing low power and high flow rate. Compared to diaphragm pumps, it increases water flow rate for the same power.

[0048] In summary, this invention combines the features of a brushed motor submersible pump and an aquarium submersible pump. Compared to an aquarium pump, it can pump water vertically from bottom to top, has a smaller lateral diameter, and can accommodate bottle openings of more diameters. Compared to a brushed submersible pump, it solves the problem that brushed submersible pumps cannot be completely waterproof, thus increasing their service life.

[0049] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A brushless submersible pump comprising a first casing (1) and a drive device mounted inside the first casing (1), characterized in that, The first housing (1) has an outlet (2) at its upper end and an inlet (3) at its lower end. The driving device includes a second housing (4), a brushless drive assembly (5), and an impeller (7). The second housing (4) is embedded in the first housing (1) and fixedly connected to the first housing (1). The gap between the second housing (4) and the first housing (1) forms a water flow channel. The brushless drive assembly (5) is installed inside the second housing (4). The impeller (7) is located at one end of the second housing (4) near the inlet (3) and is driven and connected to the output end of the brushless drive assembly (5). The second housing (4) has a sealing assembly (6) inside the second housing (4) at the output end of the brushless drive assembly (5) to prevent water from entering the interior of the second housing (4).

2. A brushless submersible pump according to claim 1, characterized in that The brushless drive assembly (5) includes an annular coil core (51), a cylindrical magnet (52), a rotating shaft (54), and a fixed shaft (53). The annular coil core (51) is fixedly installed on the inner wall of the second housing (4). The fixed shaft (53) is inserted into the annular coil core (51) and fixedly connected to the second housing (4). The cylindrical magnet (52) is sleeved on the fixed shaft (53) and rotatably connected to the circular fixed seat (71). The rotating shaft (54) is fixedly connected to the end of the cylindrical magnet (52) near the water inlet (3). The end of the rotating shaft (54) away from the cylindrical magnet (52) is inserted into the outside of the second housing (4) and fixedly connected to the impeller (7).

3. A brushless submersible pump according to claim 2, wherein The second housing (4) is further provided with a third housing (41). The third housing (41) is inserted into the annular coil core (51) and fixedly connected to the inner wall of the second housing (4). The end of the third housing (41) near the water inlet (3) is sealed to the inner wall of the second housing (4). One end of the fixed shaft (53) is fixedly connected to the upper inner wall of the third housing (41). The columnar magnet is installed in the third housing (41) and rotatably connected to the fixed shaft (53). The rotating shaft (54) is inserted to the outside of the second housing (4) and fixedly connected to the impeller (7).

4. A brushless submersible pump according to claim 3, wherein The gap between the second housing (4) and the third housing (41) is sealed with glue.

5. A brushless submersible pump as claimed in claim 1, wherein, The sealing assembly (6) includes a seal (61), and the seal (61) has an oil cavity (62) for sealing in the middle. The drive end of the brushless drive assembly (5) passes through the seal (61) and the oil cavity (62) and is inserted into the outside of the second housing (4) and fixedly connected to the impeller (7).

6. A brushless submersible pump as claimed in claim 1, wherein, The second housing (4) has a wiring port (10) at one end near the water outlet (2), and a motor wire (8) is inserted into the wiring port (10). A circuit board (9) is installed inside the second housing (4) near the wiring port (10), and the motor wire (8) is electrically connected to the circuit board (9).

7. A brushless submersible pump as claimed in claim 1, wherein, The impeller (7) includes several blades (72) and a circular fixed seat (71). Each blade (72) is provided with an arc-shaped guide portion (73). The center of one end of the circular fixed seat (71) is provided with a groove that matches the drive end of the brushless drive assembly (5). The blades (72) are evenly arranged along the periphery of the fixed seat and the arc-shaped guide portions (73) are all arranged clockwise.

8. A brushless submersible pump as claimed in claim 1, wherein, The first housing (1) is provided with several support columns (12) at one end of the water inlet (3).

9. A brushless submersible pump as claimed in claim 1, wherein, The first housing (1) is provided with a water pump cover (11) at the upper end, and the water outlet (2) is provided on the water pump cover (11). The water pump cover (11) is detachably connected to the first housing (1).

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