Liquid heating device

Abstract

This utility model relates to the field of household appliance technology and provides a liquid heating device. The water pump module of this liquid heating device includes: a housing with an inlet, an outlet, and a working chamber; a water-isolating assembly including a water-isolating plate and a positioning shaft formed on the water-isolating plate, the surface of the positioning shaft being coated with a wear-resistant layer; the water-isolating plate being connected to the housing and covering the opening of the working chamber; an impeller assembly disposed within the working chamber and mounted on the positioning shaft; and a drive assembly configured to drive the impeller assembly to rotate around the positioning shaft within the working chamber. The liquid heating device proposed in this utility model, by providing at least a partial wear-resistant layer on the surface of the positioning shaft of the water-isolating assembly, greatly enhances the friction resistance between the positioning shaft and the impeller assembly. This effectively reduces wear caused by long-term high-speed rotation, thereby extending the overall service life of the water pump module, especially for the heavier impeller module, significantly reducing maintenance costs and replacement frequency.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to a liquid heating device. Background Technology

[0002] With the increasing popularity of household appliances such as electric water heaters, users have placed higher demands on the health and durability of water-contacting components. In traditional electric water heater pump modules, the impeller assembly and water-contacting parts are typically made of plastic. While plastic parts offer advantages such as low cost and ease of molding, in actual use, prolonged contact with high-temperature water (such as boiling water or high-temperature steam) can cause plastic parts to undergo thermal deformation, aging, and even release harmful substances, shortening the pump's lifespan and posing safety hazards. However, directly replacing plastic with high-temperature resistant materials such as stainless steel or ceramics would result in a heavier weight, significantly impacting the pump module's lifespan. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in related technologies. To this end, this invention proposes a liquid heating device that, by setting a wear-resistant layer on the water-proof component, greatly enhances the friction resistance between the positioning shaft and the impeller assembly, effectively reducing wear caused by long-term high-speed rotation, thereby extending the overall service life of the pump module. Especially for the heavier impeller module, it significantly reduces maintenance costs and replacement frequency.

[0004] The liquid heating device according to this utility model includes a container, a water pump module, and a heating module; the container forms a liquid storage cavity; the heating module is disposed in the liquid storage cavity;

[0005] The water pump module includes:

[0006] The shell has an inlet and an outlet, and a working chamber is formed inside the shell that communicates with the inlet and the outlet; the working chamber is connected to the liquid storage chamber through the inlet.

[0007] A water-proof assembly, comprising a water-proof plate and a positioning shaft on the water-proof plate, wherein the surface of the positioning shaft is at least partially provided with a wear-resistant layer, the water-proof plate is connected to the housing, and the water-proof plate covers the opening of the working chamber;

[0008] An impeller assembly is disposed within the working chamber and mounted on the positioning shaft;

[0009] A drive assembly is configured to drive the impeller assembly to rotate within the working chamber about the positioning axis to discharge fluid introduced from the inlet to the outlet.

[0010] The liquid heating device proposed in this invention utilizes a water pump module to draw water from the storage chamber, thereby achieving a water pumping function. The water pump module in this liquid heating device significantly enhances the friction resistance between the positioning shaft and the impeller assembly by providing at least a partial wear-resistant layer on the surface of the positioning shaft of the water-proof component. This effectively reduces wear caused by long-term high-speed rotation, thus extending the overall service life of the water pump module. Especially for the heavier impeller module, it significantly reduces maintenance costs and replacement frequency.

[0011] According to one embodiment of the present invention, the wear-resistant layer is a metal coating or a ceramic coating.

[0012] According to one embodiment of the present invention, the impeller assembly includes: an impeller housing, a first magnetic element, and a first sealing element; the drive assembly includes: a drive element and a second magnetic element;

[0013] The impeller housing is rotatably mounted on the positioning shaft, and a receiving cavity is formed inside the impeller housing. The first magnetic element is disposed in the receiving cavity, and the first sealing element covers the opening of the receiving cavity.

[0014] The first magnetic component and the second magnetic component are arranged opposite each other on both sides of the baffle plate. The drive shaft of the drive component is connected to the second magnetic component, so that the drive component drives the second magnetic component, causing the first magnetic component to drive the impeller housing to rotate. The impeller assembly can maintain stable and efficient rotation during startup, operation, and shutdown.

[0015] This embodiment, through the combination of impeller housing, first magnetic component and first sealing component, not only achieves stable rotation of the impeller assembly on the water-proof assembly, but also avoids direct contact between the first magnetic component and water.

[0016] According to one embodiment of the present invention, the periphery of the opening of the receiving cavity is provided with a stepped surface extending around the opening, the stepped surface being recessed from the edge of the opening of the receiving cavity toward the inside of the receiving cavity, and the first sealing member being embedded along the recess at the opening of the receiving cavity.

[0017] This embodiment achieves effective sealing of the receiving cavity through the cooperation of the stepped surface and the sealing plate, thereby improving the sealing performance and stability of the impeller assembly.

[0018] According to one embodiment of the present invention, at least one of the first sealing member and the sidewall of the receiving cavity is formed with an annular groove disposed therein in the circumferential direction;

[0019] The impeller assembly further includes a second seal; the second seal is disposed in the annular groove to fix the first seal in the opening of the receiving cavity.

[0020] This embodiment uses a combination of the first and second sealing elements to form multiple sealing barriers, effectively preventing external fluids from entering the receiving cavity.

[0021] According to one embodiment of the present invention, the receiving cavity is an annular cavity, the inner ring sidewall of the annular cavity is formed with a first annular groove, and the first sealing member is provided with a second annular groove facing the outer ring of the annular cavity;

[0022] The second sealing element includes a first sealing ring and a second sealing ring, wherein the first sealing ring is disposed in the first annular groove and the second sealing ring is disposed in the second annular groove, so that the inner and outer sides of the first sealing element are sealed in the annular cavity.

[0023] In this embodiment, the inner and outer sides of the first seal are firmly sealed within the annular cavity through the combined action of the first and second sealing rings. This not only provides extremely high sealing performance but also prevents the first seal from shifting or falling off during operation due to vibration, fluid pressure, or other external factors.

[0024] According to one embodiment of the present invention, blades are formed on one side of the impeller housing and a shaft groove is formed on the other side;

[0025] The positioning shaft extends to the rotating shaft groove so that the impeller housing rotates around the positioning shaft as the drive assembly drives the impeller assembly to rotate.

[0026] According to one embodiment of the present invention, a third sealing ring is further provided between the other side of the impeller housing and the water baffle plate.

[0027] According to one embodiment of the present invention, an arc-shaped contact surface is formed in the rotating shaft groove, and the positioning shaft abuts against the arc-shaped contact surface.

[0028] This embodiment uses an arc-shaped contact surface to make the contact between the positioning shaft and the impeller housing more uniform and smooth, which can reduce friction and wear between the contact surfaces, thereby reducing the resistance to rotation.

[0029] According to one embodiment of the present invention, the inner wall of the rotating shaft groove and the arc-shaped contact surface are provided with a wear-resistant layer.

[0030] Additional aspects and advantages of this 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

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies 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 these drawings without creative effort.

[0032] Figure 1 This is a three-dimensional structural schematic diagram of the impeller module provided in an embodiment of the present utility model.

[0033] Figure 2 This is an exploded structural diagram of the impeller module provided in an embodiment of this utility model.

[0034] Figure 3 This is a cross-sectional structural diagram of the impeller module provided in an embodiment of the present invention.

[0035] Figure 4 This is a schematic diagram of the waterproof component provided in an embodiment of the present invention.

[0036] Figure 5 This is one of the schematic diagrams of the water-proof component provided in this utility model embodiment being installed on the impeller assembly.

[0037] Figure 6 This is the second schematic diagram of the water-blocking component provided in this embodiment of the utility model being installed on the impeller assembly.

[0038] Figure 7 This is a schematic diagram of the impeller assembly provided in an embodiment of the present invention.

[0039] Figure 8 This is a schematic diagram of the liquid heating device provided in an embodiment of the present invention.

[0040] Figure label:

[0041] 1. Water pump module; 11. Housing; 111. Inlet pipe; 112. Outlet pipe; 113. Housing body; 12. Water-proof assembly; 121. Water-proof plate; 1211. Recessed groove; 122. Positioning shaft; 1221. Wear-resistant layer; 13. Impeller assembly; 131. Impeller housing; 1311. Arc-shaped contact surface; 132. First sealing ring; 133. Second sealing ring; 134. First magnetic component; 135. First sealing component; 14. Drive assembly; 141. Drive component; 142. Second magnetic component; 143. Rotating seat; 15. Third sealing ring; 16. Fixed seat;

[0042] 2. Container; 21. Liquid storage chamber. Detailed Implementation

[0043] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model 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 limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0045] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the 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 may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] The following is combined Figures 1 to 8This application describes a liquid heating device. The liquid heating device includes a container 2, a water pump module 1, and a heating module; the container 2 forms a liquid storage chamber 21; the heating module is disposed in the liquid storage chamber 21. The water pump module 1 provides power to the liquid heating device to deliver hot water. The water pump module 1 in this application is applied to an electric kettle; however, it should be understood that the liquid heating device of this application can also be applied to an electric kettle, an electric tea maker, an electric water dispenser, or any other suitable device.

[0048] In one embodiment of this application, such as Figures 1 to 4 As shown, the water pump module 1 includes: a housing 11, a water-blocking assembly 12, an impeller assembly 13, and a drive assembly 14. The housing 11 has an inlet and an outlet, and a working chamber communicating with the inlet and outlet is formed inside the housing 11. The working chamber is connected to the liquid storage chamber 21 through the inlet. The water-blocking assembly 12 includes a water-blocking plate 121 and a positioning shaft 122 formed on the water-blocking plate 121. At least a wear-resistant layer 1221 is provided on the surface of the positioning shaft 122. The water-blocking plate 121 is connected to the housing 11 and covers the opening of the working chamber. The impeller assembly 13 is disposed in the working chamber and mounted on the positioning shaft 122. The drive assembly 14 is configured to drive the impeller assembly 13 to rotate around the positioning shaft 122 in the working chamber to discharge the fluid introduced from the inlet to the outlet.

[0049] In this embodiment, the housing 11 is the external structure of the water pump module 1, and it is provided with a working chamber, an inlet, and an outlet. The inlet and outlet are used for the entry and exit of fluid. The working chamber communicates with the inlet and outlet, providing movement space for the impeller assembly 13. The impeller assembly 13 is installed in the working chamber and supported by a positioning shaft 122. A wear-resistant layer 1221 is provided at the position where the positioning shaft 122 contacts the impeller assembly 13 to facilitate high-speed rotation of the impeller assembly 13.

[0050] When the liquid heating device is working, the drive assembly 14 starts and drives the impeller assembly 13 to rotate around the water-blocking assembly 12 in the working chamber. The rotation of the impeller assembly 13 generates centrifugal force, which draws water from the liquid storage chamber 21 into the working chamber through the inlet. The water is pushed by the impeller assembly 13 in the working chamber and discharged through the outlet, thereby realizing the water pumping function.

[0051] It should be noted that in this embodiment, the water-contacting components can be made of hard materials such as metal or ceramic. These materials have good corrosion resistance, high temperature resistance, and mechanical strength, but are relatively heavy. In this case, a wear-resistant layer 1221 is provided on the positioning shaft 122, which is suitable for the high-speed rotating and heavy impeller assembly 13, and can effectively ensure the normal operation of the water pump module.

[0052] The liquid heating device proposed in this invention utilizes a water pump module 1 to draw water from the storage chamber 21, thereby achieving a water pumping function. Furthermore, the water pump module 1 in this liquid heating device significantly enhances the friction resistance between the positioning shaft 122 and the impeller assembly 13 by providing a wear-resistant layer 1221 on the positioning shaft 122 of the water-insulating component 12. This effectively reduces wear caused by long-term high-speed rotation, thereby extending the overall service life of the water pump module 1. Especially for the heavier impeller module, this significantly reduces maintenance costs and replacement frequency.

[0053] In some embodiments, the wear-resistant layer 1221 on the positioning shaft 122 may be machined and surface-treated to improve hardness and corrosion resistance. The wear-resistant layer 1221 may be provided only at a portion of the surface of the positioning shaft 122 or on the entire surface of the positioning shaft 122 as needed.

[0054] Specifically, the machined wear-resistant layer 1221 is further subjected to anodizing treatment. Anodizing is an electrochemical process that improves the hardness, wear resistance, and corrosion resistance of the metal by forming a dense oxide film on the surface of the positioning shaft 122.

[0055] After anodizing, a coating treatment can be performed. The coating can be made of materials with high hardness, high wear resistance and good corrosion resistance, such as certain metal alloys or compounds, to further enhance the performance of the wear-resistant layer 1221.

[0056] The wear-resistant layer 1221 can be a metal coating, typically made of metals or metal alloys with high hardness, high wear resistance, and good corrosion resistance, such as chromium (Cr), nickel (Ni), titanium (Ti), and their alloys. These metal coatings can be uniformly deposited on the surface of the positioning shaft 122 through processes such as electroplating, electroless plating, or physical vapor deposition (PVD). The metal coating not only improves the hardness of the positioning shaft 122 but also enhances its wear resistance and corrosion resistance, thereby extending the service life of the water pump module 1.

[0057] In addition, the wear-resistant layer 1221 can also be a non-metallic coating, such as a ceramic coating. Ceramic coatings have extremely high hardness and wear resistance, as well as good chemical and thermal stability. The ceramic coating can be deposited on the surface of the positioning shaft 122 using processes such as thermal spraying, chemical vapor deposition (CVD), or physical vapor deposition (PVD). Compared to metallic coatings, ceramic coatings typically have higher hardness and better high-temperature resistance, making them suitable for the water pump module 1 operating under extreme conditions.

[0058] In some embodiments, such as Figure 2 , Figure 3 and Figure 5As shown, the impeller assembly 13 includes: an impeller housing 131, a first magnetic element 134, and a first seal 135; the impeller housing 131 is rotatably mounted on the positioning shaft 122, a receiving cavity is formed inside the impeller housing 131, the first magnetic element 134 is disposed in the receiving cavity, and the first seal 135 covers the opening of the receiving cavity; the drive assembly 14 is configured to drive the impeller housing 131 to rotate on the positioning shaft 122 via the first magnetic element 134.

[0059] In this embodiment, the impeller housing 131 is the main body of the impeller assembly 13. It is rotatably mounted on the water-blocking assembly 12 and supported and positioned by the positioning shaft 122. The first magnetic element 134 is disposed within the receiving cavity of the impeller housing 131. When the corresponding magnetic element (or electromagnet) in the drive assembly 14 generates a magnetic field, the first magnetic element 134 will be rotated by the magnetic force, thereby driving the impeller housing 131 to rotate together. The first sealing element 135 covers the opening of the receiving cavity to ensure that the first magnetic element 134 inside the receiving cavity is not corroded or disturbed by external fluids.

[0060] In this embodiment, the drive assembly 14 includes a drive member 141 and a second magnetic member 142; the first magnetic member 134 is disposed in the impeller housing 131, and the first magnetic member 134 and the second magnetic member 142 are disposed opposite to each other on both sides of the baffle plate 121. The drive shaft of the drive member 141 is connected to the second magnetic member 142 so that the second magnetic member 142 is driven by the drive member 141, thereby causing the first magnetic member 134 to drive the impeller housing 131 to rotate.

[0061] Both the first magnetic component 134 and the second magnetic component 142 are made of magnets or magnetic materials. The first magnetic component 134 and the second magnetic component 142 have the same magnetism at their opposite positions. The drive component 141 can be a motor or other rotating drive component. When the rotation of the drive component 141 is transmitted to the second magnetic component 142 via the drive shaft, a magnetic interaction occurs between the second magnetic component 142 and the first magnetic component 134. Under the action of the magnetic force, the first magnetic component 134 drives the impeller housing 131 to begin rotating. Thus, the impeller housing 131 rotates at high speed within the working chamber. The rotation of the impeller housing 131 generates centrifugal force, drawing fluid from the inlet into the working chamber. The fluid is accelerated under the action of the impeller housing 131 and discharged through the outlet. When the pump module 1 completes its task or reaches a preset condition, the power is cut off, and the drive component 141 stops rotating. After the second magnetic component 142 stops rotating, it provides a certain resistance to the first magnetic component 134, ultimately causing the entire impeller housing 131 to stop rotating.

[0062] This embodiment, through the combination of impeller housing 131, first magnetic component 134, and first sealing component 135, not only achieves stable rotation of impeller assembly 13 on water-proof assembly 12, but also avoids direct contact between first magnetic component 134 and water. Impeller assembly 13 can maintain stable and efficient rotation during startup, operation, and shutdown.

[0063] In some embodiments, such as Figures 1 to 3 As shown, the shell 11 includes: a shell body 113, a water inlet pipe 111, and a water outlet pipe 112; a water-proof assembly 12 is connected to the shell body 113 and forms a working cavity with the shell body 113; a water inlet is formed on the top surface of the shell body 113 (opposite to the opening), and a water outlet is formed on the side of the shell body 113 extending tangentially along the inner wall of the working cavity; the water inlet pipe 111 extends in a straight line, the water inlet is connected to the water inlet pipe 111, and the water outlet is connected to the water outlet pipe 112.

[0064] In this embodiment, the inlet pipe 111 extends in a straight line, which helps reduce fluid resistance and vortices in the pipe, thereby improving fluid flow efficiency. More importantly, the straight inlet pipe 111 facilitates the return of air bubbles generated in the working chamber of the impeller assembly 13, which helps reduce the negative impact of air bubbles on pumping efficiency, as air bubbles reduce fluid density and pumping efficiency. Simultaneously, the tangential outlet design increases the efficiency of fluid discharge, improving the pumping efficiency of the high-efficiency pump module 1.

[0065] The shell body 113, the inlet pipe 111, and the outlet pipe 112 are all made of metal, ensuring the strength and durability of the components. At the same time, the metal shell body 113, the inlet pipe 111, and the outlet pipe 112 can avoid the problems of thermal deformation, aging, or even the release of harmful substances by plastic parts when in contact with high-temperature water.

[0066] Typically, the inlet pipe 111 and the outlet pipe 112 are connected to the housing 113 via welding. This welding connection forms a continuous metal interface, providing excellent sealing performance. This helps prevent fluid leakage from the connection point, ensuring the efficiency and performance of the pump module 1. The welding process also provides strong connection strength, enabling the pump module 1 to withstand high operating pressures and fluid impact forces.

[0067] In some embodiments, such as Figure 5 As shown, the periphery of the opening of the receiving cavity has a stepped surface extending around the opening. This stepped surface is recessed from the edge of the receiving cavity opening towards the inside of the receiving cavity, forming a groove similar to that for embedding a seal. The first seal 135 is embedded in the opening of the receiving cavity along the recess of the stepped surface. This embedding method ensures tight contact between the seal and the impeller housing 131, improving the reliability of the seal.

[0068] In this embodiment, the first sealing element 135 can be a sealing sheet. The sealing sheet can be bonded to the stepped surface on the impeller housing 131 by adhesive bonding. Adhesive bonding is not only simple and easy to implement, but also provides sufficient adhesive force to ensure that the sealing sheet will not fall off or loosen during long-term use. Through the cooperation of the stepped surface and the sealing sheet, the receiving cavity of the impeller assembly 13 is effectively sealed. This sealing design can prevent external fluid from entering the receiving cavity and protect the internal magnetic components and other parts from corrosion. At the same time, the presence of the sealing element also reduces the noise and vibration of the impeller assembly 13 during operation, improving the overall performance of the water pump module 1.

[0069] This embodiment achieves effective sealing of the receiving cavity through the cooperation of the stepped surface and the sealing plate, thereby improving the sealing performance and stability of the impeller assembly 13.

[0070] In some embodiments, such as Figure 6 As shown, at least one of the first seal 135 and the sidewall of the receiving cavity has an annular groove arranged circumferentially thereon. This annular groove may be located at the edge of the first seal 135, or at a position on the sidewall of the receiving cavity near the opening, or both, to provide more sealing and securing options.

[0071] In this embodiment, the impeller assembly 13 further includes a second seal, which is an auxiliary sealing element for enhancing sealing and fixation. The second seal is disposed in an annular groove and fits tightly with the annular groove through its elasticity or shape. By providing the second seal, the first seal 135 can be more securely fixed at the opening of the receiving cavity. The second seal not only provides an additional sealing layer but also prevents the first seal 135 from shifting due to vibration or fluid pressure during operation.

[0072] This embodiment uses the combination of the first seal 135 and the second seal to form a multi-layer sealing barrier, effectively preventing external fluid from entering the receiving cavity.

[0073] Specifically, such as Figure 5 As shown, the receiving cavity is an annular cavity, the shape of which is adapted to the internal structure of the impeller housing 131, providing installation space for other components of the impeller assembly 13. A first annular groove is formed on the inner sidewall of the annular cavity, designed for installing and securing the first sealing ring 132. Simultaneously, a second annular groove is provided on the outer ring of the first sealing member 135 facing the annular cavity. The second annular groove is used to install and secure the second sealing ring 133, ensuring an effective seal on the outer side of the first sealing member 135 as well.

[0074] The second sealing element includes a first sealing ring 132 and a second sealing ring 133. The first sealing ring 132 is disposed in a first annular groove on the inner sidewall of the annular cavity, achieving an inner seal through a tight fit. The second sealing ring 133 is disposed in a second annular groove of the first sealing element 135, achieving an outer seal through a similarly tight fit.

[0075] Through the combined action of the first sealing ring 132 and the second sealing ring 133, both the inner and outer sides of the first sealing element 135 are firmly sealed in the annular cavity. This not only provides extremely high sealing performance, but also prevents the first sealing element 135 from shifting or falling off during operation due to vibration, fluid pressure, or other external factors.

[0076] In some embodiments, such as Figure 2 and Figure 3 As shown, blades are formed on one side of the impeller housing 131. When the impeller housing 131 rotates, the blades push the fluid to flow, thereby realizing the pumping or draining function of the water pump. A shaft groove is formed on the other side of the impeller housing 131, and a positioning shaft 122 extends into the shaft groove. The positioning shaft 122 serves to support and position the impeller housing 131 so that the impeller housing 131 rotates around the positioning shaft 122 during the process of the drive assembly 14 driving the impeller assembly 13 to rotate.

[0077] To reduce rotational resistance, an arc-shaped contact surface 1311 is formed in the shaft groove, and the positioning shaft 122 abuts against the arc-shaped contact surface 1311. The arc-shaped contact surface 1311 makes the contact between the positioning shaft 122 and the impeller housing 131 more uniform and smooth, which can reduce friction and wear between the contact surfaces, thereby reducing rotational resistance.

[0078] In addition to using an arc-shaped contact surface 1311, a spherical contact surface can also be formed in the shaft groove, and the positioning shaft 122 has a spherical head that matches the spherical contact surface. This method can make the contact between the positioning shaft 122 and the impeller housing 131 more uniform, reduce stress concentration caused by point contact, and thus reduce frictional resistance.

[0079] Furthermore, such as Figure 7 As shown, in addition to providing a wear-resistant layer 1221 on the surface of the positioning shaft 122, a wear-resistant layer 1221 can also be provided on the inner wall of the shaft groove and the arc-shaped contact surface 1311.

[0080] Specifically, a wear-resistant layer 1221 is simultaneously added to the inner wall surface of the shaft groove and the arc-shaped contact surface 1311, forming a bidirectional wear-resistant system that cooperates with the wear-resistant layer 1221 of the positioning shaft 122. This wear-resistant layer 1221 can adopt the same or different treatment scheme as the surface of the positioning shaft 122. The wear-resistant layer 1221 on the inner wall surface of the shaft groove directly contacts the positioning shaft 122 or the wear-resistant layer 1221 outside the positioning shaft 122, while the wear-resistant layer 1221 on the arc-shaped contact surface 1311 contacts the end of the positioning shaft 122 or the wear-resistant layer 1221 on the end. By adding wear-resistant layers 1221 in these areas, the coefficient of friction between the two can be significantly reduced, reducing material wear and deformation caused by long-term friction, thereby effectively alleviating vibration and noise problems caused by wear and improving the smoothness and quietness of the pump module 1's operation.

[0081] When wear-resistant layers 1221 are set at the same time, the wear-resistant layers 1221 on multiple contact surfaces work together to form a comprehensive wear-resistant protection system, which enables the impeller assembly 13 to maintain good working performance under high-intensity and long-term working conditions, greatly extending the service life of the water pump module 1 and enhancing the overall reliability and durability of the liquid heating device.

[0082] In addition, the drive assembly 14 is also provided with a rotating seat 143 and a fixed sleeve. The fixed sleeve is fitted on the rotating shaft, and the rotating seat 143 is fitted on the fixed sleeve. The rotating seat 143 is used to support and fix the second magnetic component 142.

[0083] In this embodiment, after the driving component 141 is energized, it drives the driving shaft to rotate, and the fixed sleeve rotates accordingly. The rotation of the fixed sleeve drives the rotating seat 143 to rotate, and the second magnetic component 142 on the rotating seat 143 rotates accordingly. Thus, the second magnetic component 142 drives the first magnetic component 134 to rotate through magnetic force, so that the first magnetic component 134 and the impeller housing 131 start to rotate synchronously.

[0084] like Figure 2 As shown, the water pump module 1 also includes a mounting base 16. The mounting base 16 forms an installation space, and its side is connected to components within the liquid heating device for fixing the entire water pump module. The upper side of the mounting base 16 is connected to the housing 11, and the lower side is connected to the drive assembly 14. The first magnetic element 134 (and the entire impeller assembly 13) is opposite to the installation space, and the second magnetic element 142 is disposed within the installation space, opposite to the first magnetic element 134. The drive shaft of the drive element 141 is connected to the second magnetic element 142, and by rotating the second magnetic element 142, the first magnetic element 134 and the impeller assembly 13 are driven to rotate.

[0085] To avoid sealing within the working chamber, in some embodiments, such as Figure 2As shown, a third sealing ring 15 is also provided between the impeller housing 131 and the baffle plate 121. The third sealing ring 15 is usually made of corrosion-resistant and wear-resistant materials, such as fluororubber, silicone rubber or polytetrafluoroethylene.

[0086] Correspondingly, such as Figure 3 and Figure 4 As shown, the baffle plate 121 has a recessed groove 1211 for accommodating the third sealing ring 15 and the bottom edge of the impeller housing 131. The third sealing ring 15 is arranged circumferentially along the impeller housing 131, and the entire bottom edge of the impeller housing 131 is fitted into the recessed groove 1211 in conjunction with the third sealing ring 15. During the rotation of the impeller housing 131, the third sealing ring 15 is tightly fitted between the bottom edge of the impeller housing 131 and the recessed groove 1211 of the baffle plate 121, preventing fluid leakage from the working chamber. The elastic design of the third sealing ring 15 allows for slight displacement of the impeller housing 131 during rotation while maintaining sealing performance. By setting the third sealing ring 15 between the impeller housing 131 and the baffle plate 121, and combining it with the recessed groove 1211 design, the pump module 1 can ensure the sealing of the working chamber while allowing slight displacement of the impeller housing 131 during rotation.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be covered within the scope of the claims of the present invention.

Claims

1. A liquid heating device, characterized in that, It includes a container (2), a water pump module (1), and a heating module; the container (2) forms a liquid storage chamber (21); the heating module is located in the liquid storage chamber (21); The water pump module (1) includes: The shell (11) has an inlet and an outlet, and a working chamber is formed inside the shell (11) that communicates with the inlet and the outlet; the working chamber is connected to the liquid storage chamber (21) through the inlet; A water-proof assembly (12) includes a water-proof plate (121) and a positioning shaft (122) on the water-proof plate (121). The surface of the positioning shaft (122) is at least partially provided with a wear-resistant layer (1221). The water-proof plate (121) is connected to the housing (11) and covers the opening of the working chamber. An impeller assembly (13) is disposed in the working chamber and mounted on the positioning shaft (122). The drive assembly (14) is configured to drive the impeller assembly (13) to rotate about the positioning shaft (122) within the working chamber to discharge fluid introduced from the inlet to the outlet.

2. The liquid heating device according to claim 1, characterized in that, The wear-resistant layer (1221) is a metal coating or a ceramic coating.

3. The liquid heating device according to claim 1, characterized in that, The impeller assembly (13) includes: an impeller housing (131), a first magnetic element (134), and a first seal (135); the drive assembly (14) includes: a drive element (141) and a second magnetic element (142). The impeller housing (131) is rotatably mounted on the positioning shaft (122), and a receiving cavity is formed inside the impeller housing (131). The first magnetic element (134) is disposed in the receiving cavity, and the first sealing element (135) covers the opening of the receiving cavity. The first magnetic element (134) and the second magnetic element (142) are arranged opposite to each other on both sides of the water-blocking plate (121). The drive shaft of the drive element (141) is connected to the second magnetic element (142) so that the second magnetic element (142) is driven by the drive element (141) so that the first magnetic element (134) drives the impeller housing (131) to rotate.

4. The liquid heating device according to claim 3, characterized in that, The periphery of the cavity opening is provided with a stepped surface extending around the opening. The stepped surface is recessed from the edge of the cavity opening toward the inside of the cavity. The first sealing member (135) is embedded in the cavity opening along the recess.

5. The liquid heating device according to claim 3, characterized in that, At least one of the first sealing member (135) and the sidewall of the receiving cavity is formed with an annular groove disposed therein; The impeller assembly (13) further includes a second seal; the second seal is disposed in the annular groove to fix the first seal (135) in the opening of the receiving cavity.

6. The liquid heating device according to claim 5, characterized in that, The receiving cavity is an annular cavity, and the inner ring sidewall of the annular cavity is formed with a first annular groove. The first sealing member (135) is provided with a second annular groove facing the outer ring of the annular cavity. The second sealing element includes a first sealing ring (132) and a second sealing ring (133). The first sealing ring (132) is disposed in the first annular groove, and the second sealing ring (133) is disposed in the second annular groove, so that the inner and outer sides of the first sealing element (135) are sealed in the annular cavity.

7. The liquid heating device according to claim 3, characterized in that, The impeller housing (131) has blades formed on one side and a shaft groove formed on the other side; The positioning shaft (122) extends into the shaft groove so that the impeller housing (131) rotates around the positioning shaft (122) as the drive assembly (14) drives the impeller assembly (13) to rotate.

8. The liquid heating device according to claim 7, characterized in that, A third sealing ring (15) is also provided between the other side of the impeller housing (131) and the water baffle (121).

9. The liquid heating device according to claim 7, characterized in that, An arc-shaped contact surface (1311) is formed in the shaft groove, and the positioning shaft (122) abuts against the arc-shaped contact surface (1311).

10. The liquid heating device according to claim 9, characterized in that, The inner wall of the shaft groove and the arc-shaped contact surface (1311) are provided with a wear-resistant layer.

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