Motor assembly and supercharging device

Abstract

The utility model provides a kind of motor assembly, it includes pump shell assembly, rotor assembly, stator assembly and bearing support;The pump shell assembly is in the shape of "concave", the fourth accommodating cavity is formed in one end of upward, the fifth accommodating cavity is formed in one end of downward, the rotor assembly is received in the fourth accommodating cavity, the stator assembly is received in the fifth accommodating cavity, the bearing support is arranged above the fourth accommodating cavity and is fixedly connected with the pump shell assembly;At least two water inlets are opened on the bearing support, the water inlet penetrates the bearing support in axial direction and is communicated with the fourth accommodating cavity.

Description

Technical Field

[0001] This utility model belongs to the technical field of booster device equipment, specifically relating to a motor assembly and a booster device. Background Technology

[0002] Zero-cold-water water heaters are an upgrade from traditional gas water heaters. Their core advantage is that hot water is available immediately upon turning on the tap, eliminating the need to wait for cold water to flow out. This fundamentally solves the pain point of users experiencing "cold water flowing out first, then hot water coming out." The key to zero-cold-water water heaters lies in the addition of a circulation pump and temperature control system. By pre-circulating and heating the cold water in the pipes, the system keeps the pipes constantly hot.

[0003] Currently, the water pumps used in zero-cold-water water heaters are single-stage centrifugal pumps, meaning the pump has a single impeller. This structure has several problems: when the impeller is small, the pump operates with less noise, but the flow rate and head are also smaller. When installed in the water heater's circulation pipes, the circulation flow rate is also relatively small, and it takes a longer time for the circulation pipes to fill with hot water after the zero-cold-water function is turned on. To increase the flow rate and head of a single-stage pump with a small impeller, the impeller speed must be increased. However, increasing the speed also increases the pump's operating noise, resulting in a poor user experience. Another way to increase the pump's flow rate is to increase the impeller's outer diameter. Increasing the outer diameter increases the pump's size and power, increasing the load on the water heater's mainboard. Furthermore, the larger pump size necessitates a larger gas water heater, significantly increasing manufacturing costs.

[0004] To address this, the research team developed a two-stage booster device with a wide efficiency range, which increases the water flow in the pipeline. However, it is still necessary to design a low-noise and reliable motor for the two-stage booster device. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a motor assembly and booster device with low noise and high reliability.

[0006] This utility model provides a motor assembly, which includes a pump housing assembly, a rotor assembly, a stator assembly, and a bearing bracket;

[0007] The pump housing assembly is concave, with the upward-facing end forming a fourth receiving cavity and the downward-facing end forming a fifth receiving cavity. The rotor assembly is housed in the fourth receiving cavity, the stator assembly is housed in the fifth receiving cavity, and the bearing bracket is disposed above the fourth receiving cavity and fixedly connected to the pump housing assembly.

[0008] The bearing bracket has at least two water inlet holes, which penetrate the bearing bracket in the axial direction and communicate with the fourth receiving cavity.

[0009] Preferably, the rotor assembly includes a rotor, an output shaft fixedly connected to the middle of the rotor, and a first ceramic bushing and a second ceramic bushing disposed at both ends of the rotor. The rotor has a gap with the inner wall of the fourth receiving cavity. The output shaft passes through the second ceramic bushing, the rotor, and the first ceramic bushing in sequence and extends upward. The water inlet hole communicates with the gap to form a fluid channel. The fluid channel extends to the second ceramic bushing for fluid lubrication of the second ceramic bushing.

[0010] Preferably, the rotor has at least one water leakage hole that extends axially through the rotor, the water leakage hole connecting the water inlet hole and / or the fluid channel and extending to the second ceramic bushing, for fluid lubrication of the second ceramic bushing.

[0011] Preferably, the bearing bracket is provided with a first mounting groove on the side facing the rotor, and the first ceramic bushing is installed in the first mounting groove;

[0012] The inner wall surface of the first mounting groove is provided with at least one raised second limiting rib, and the outer wall surface of the first ceramic bushing is provided with a third limiting groove corresponding to the second limiting rib. When the first ceramic bushing is installed into the first mounting groove, the second limiting rib and the third limiting groove cooperate to fix the first ceramic bushing relative to the bearing bracket.

[0013] Preferably, at least one first water inlet groove is further provided on the inner wall surface of the first mounting groove. The first water inlet groove extends to the gap between the bearing bracket and the output shaft, so that fluid enters the first water inlet groove through the gap between the bearing bracket and the output shaft for fluid lubrication of the first ceramic bushing.

[0014] Preferably, the bottom of the fourth receiving cavity is provided with a second mounting groove, and the second ceramic bushing is installed in the second mounting groove;

[0015] The inner wall surface of the second mounting groove is provided with at least one raised third limiting rib, and the outer wall surface of the second ceramic bushing is provided with a fourth limiting groove corresponding to the third limiting rib. When the second ceramic bushing is installed into the second mounting groove, the third limiting rib and the fourth limiting groove cooperate to fix the second ceramic bushing relative to the pump housing assembly.

[0016] Preferably, at least one second water inlet groove is further provided on the inner wall surface of the second mounting groove. The second water inlet groove extends from the inner side wall of the second mounting groove to the bottom surface, so that fluid passes through the second water inlet groove for fluid lubrication of the second ceramic bushing.

[0017] Preferably, it further includes a control board assembly and a mounting bracket, the control board assembly being disposed within the fifth receiving cavity and electrically connected to the stator assembly, for connecting an external circuit to supply power to the motor assembly;

[0018] The mounting bracket is disposed at the end of the fifth receiving cavity and is fixedly connected to the pump housing assembly to seal the fifth receiving cavity.

[0019] This utility model also provides a boosting device, which includes a pump cover assembly, a boosting mechanism, and a motor assembly as described above. The pump cover assembly forms a third receiving cavity at one end facing the motor assembly. The boosting mechanism is disposed in the third receiving cavity. The output shaft of the motor assembly faces the third receiving cavity and is fixedly connected to the boosting mechanism to drive the boosting mechanism to rotate. The pump cover assembly is fixedly connected to the motor assembly.

[0020] The pump cover assembly has an inlet and a outlet, which are connected to the third receiving cavity, so that water flows in from the inlet and is pressurized by the pressurizing mechanism before flowing out from the outlet.

[0021] Preferably, the bearing bracket has a second recess on the side facing the boosting mechanism, and the output shaft of the motor assembly has a snap-fit ​​portion on the end facing the boosting mechanism. The boosting mechanism is limited in the snap-fit ​​portion, and a fluid channel for fluid flow is formed between the boosting mechanism and the bearing bracket.

[0022] Compared to existing technologies, the motor assembly and booster device in this solution have at least the following advantages:

[0023] The motor assembly provided in this solution houses the rotor assembly within the fourth receiving cavity of the pump housing assembly via a bearing bracket. A water inlet hole is provided on the bearing bracket. When the booster device is installed in the motor assembly, water will flow into the fourth receiving cavity through the water inlet hole to lubricate the rotor assembly, thereby reducing the noise of the rotor assembly during operation. Attached Figure Description

[0024] The above and other objects, features, and advantages of this invention will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this invention.

[0025] Figure 1 An exploded view of the motor assembly provided in an embodiment of this utility model;

[0026] Figure 2This is a schematic diagram of the structure of the pump housing assembly and the second ceramic bushing provided in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the bearing bracket and the first ceramic bushing provided in an embodiment of the present utility model;

[0028] Figure 4 A cross-sectional schematic diagram of the pump housing assembly and rotor assembly provided in an embodiment of this utility model;

[0029] Figure 5 This is a schematic diagram of the structure of a booster device provided in another embodiment of the present invention;

[0030] Figure 6 Exploded view of a pressurization device provided in another embodiment of this utility model;

[0031] Figure 7 This is a cross-sectional schematic diagram of a booster device provided in another embodiment of the present invention.

[0032] Reference numerals: 1-Boosting device, 50-Pump cover assembly, 501-Third receiving cavity, 502-Inlet, 503-Outlet, 60-Motor assembly, 601-Output shaft, 602-Pump housing assembly, 603-Stator assembly, 604-Bearing bracket, 605-Fourth receiving cavity, 606-Fifth receiving cavity, 607-Water inlet hole, 608-Rotor, 609-First ceramic bushing, 610-Second ceramic bushing, 611- Leakage hole, 612-first mounting groove, 613-second limiting rib, 614-third limiting groove, 615-first water inlet groove, 616-second mounting groove, 617-third limiting rib, 618-fourth limiting groove, 619-second water inlet groove, 620-control panel assembly, 621-mounting bracket, 622-second recess, 623-clamping part, 624-sealing ring, 625-gasket, 626-clamping piece, 70-pressurization mechanism. Detailed Implementation

[0033] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand this utility model and implement it. However, the embodiments are not intended to limit this utility model. In this embodiment, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0034] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to and integrated with the other element, or there may be an intervening element present. The terms "mounted," "one end," "the other end," and similar expressions used in this invention are for illustrative purposes only.

[0035] Currently, gas water heaters use single-stage centrifugal pumps for booster devices. While these pumps are simple in structure and can meet basic water usage scenarios, they suffer from a steep flow-head curve and a narrow high-efficiency range. In complex and variable household water usage scenarios, such as high pipe resistance and low water pressure, the flow rate rapidly decreases, leading to a rapid drop in efficiency. Increasing the pump speed increases noise levels, resulting in a poor user experience. Increasing the pump size increases the water heater's overall size, the load on the main control board, and manufacturing costs, while also hindering the miniaturization requirements of water heaters. Therefore, our research team designed a two-stage booster device that uses two-stage impellers to pressurize the water flow, achieving better booster efficiency. However, the noise problem of conventional motors during operation remains unresolved. Therefore, this invention optimizes the motor assembly structure to reduce noise during operation.

[0036] Please refer to Figures 1-4 This utility model embodiment provides a motor assembly 60, which includes a pump housing assembly 602, a rotor assembly, a stator assembly 603 and a bearing bracket 604;

[0037] The pump housing assembly 602 is concave, with its upward-facing end forming a fourth receiving cavity 605 and its downward-facing end forming a fifth receiving cavity 606. The rotor assembly is housed within the fourth receiving cavity 605, and the stator assembly 603 is housed within the fifth receiving cavity 606. The bearing bracket 604 is positioned above the fourth receiving cavity 605 and is fixedly connected to the pump housing assembly 602. It can be understood that the upward-facing end of the pump housing assembly 602 refers to... Figure 4 The upper end shown refers to the end facing downwards towards the bottom of the pump housing assembly 602. The rotor assembly and stator assembly 603 are separated by the pump housing assembly 602, forming an isolated watertight structure. In actual operation, the rotor assembly rotates due to electromagnetic induction, powered by the stator assembly 603. For example, multiple screw holes can be provided on the bearing bracket 604, and corresponding screw holes can be provided at the ends of the pump housing assembly 602. The bearing bracket 604 and the pump housing assembly 602 are fixed by screws or other connectors; alternatively, they can be fixed by adhesive or welding, etc.

[0038] The bearing bracket 604 has at least two water inlet holes 607. The water inlet holes 607 penetrate the bearing bracket 604 in the axial direction and communicate with the fourth receiving cavity 605. It can be understood that after the motor assembly 60 is installed into the pressurizing device 1, the water flow will be pressurized in the pressurizing device 1 and discharged. During this process, the water flow can enter the fourth receiving cavity 605 from the water inlet holes 607 and come into direct contact with the rotor assembly. This can lubricate the rotor assembly and reduce noise when it is rotating. At the same time, the noise transmission is also suppressed when it is surrounded by liquid.

[0039] Please refer to Figures 1-4 In a preferred embodiment, the rotor assembly includes a rotor 608, an output shaft 601 fixedly connected to the middle of the rotor 608, and a first ceramic bushing 609 and a second ceramic bushing 610 disposed at both ends of the rotor 608. A gap is provided between the rotor 608 and the inner wall of the fourth receiving cavity 605. The output shaft 601 passes sequentially through the second ceramic bushing 610, the rotor 608, and the first ceramic bushing 609 and extends upwards. A water inlet 607 communicates with this gap to form a fluid channel, which extends to the second ceramic bushing 610 for fluid lubrication. It is understood that the output shaft 601 is fixedly connected to the rotor 608. When the rotor 608 and the stator assembly 603 generate electromagnetic induction, the rotor 608 rotates around the central axis of the output shaft 601, causing the output shaft 601 to rotate synchronously, thereby achieving power output. The first ceramic bushing 609 and the second ceramic bushing 610 are respectively sleeved on the output shaft 601 and located at both ends of the rotor 608 to restrict the position of the output shaft 601 and prevent it from shifting during rotation. The water inlet 607 is connected to the gap between the rotor 608 and the fourth receiving cavity 605, so that water can enter the fourth receiving cavity 605 from the water inlet 607 and fill the fourth receiving cavity 605. That is, the first ceramic bushing 609 and the second ceramic bushing 610 will also be immersed in water. During the rotation of the output shaft 601, the water will lubricate the contact surfaces between the output shaft 601 and the first ceramic bushing 609 and the second ceramic bushing 610, thereby reducing the noise generated by the friction between the output shaft 601 and the two bushings.

[0040] In a further preferred embodiment, a gasket 625 is provided between the first ceramic bushing 609 and the rotor 608, and between the rotor 608 and the second ceramic bushing 610, respectively. The gasket 625 is preferably a graphene gasket 625 or a ceramic gasket 625, etc. This can prevent the first ceramic bushing 609 and the second ceramic bushing 610 from directly contacting the rotor 608, and prevent the rotor 608 from being damaged by contacting the two when rotating.

[0041] Please refer to Figures 1-4In a further preferred embodiment, the rotor 608 has at least one water leakage hole 611 that extends axially through the rotor 608. The water leakage hole 611 connects to the water inlet hole 607 and / or the fluid channel and extends to the second ceramic bushing 610 for fluid lubrication of the second ceramic bushing 610. It is understood that the water leakage hole 611 extends axially through the rotor 608 specifically from top to bottom, allowing it to connect with both the water inlet hole 607 and the fluid channel, enabling more water to flow to the second ceramic bushing 610. Furthermore, the water leakage hole 611 and the fluid channel form a circulation channel, allowing the water in the fourth receiving cavity 605 to circulate, preventing impurities in the water from accumulating in the fourth receiving cavity 605 and damaging the rotor 608, thus improving the reliability of the motor assembly 60.

[0042] Please refer to Figures 1-4 In this embodiment, a first mounting groove 612 is provided on the side of the bearing bracket 604 facing the rotor 608, and a first ceramic bushing 609 is installed in the first mounting groove 612. At least one protruding second limiting rib 613 is provided on the inner wall surface of the first mounting groove 612, and a third limiting groove 614 corresponding to the second limiting rib 613 is provided on the outer wall surface of the first ceramic bushing 609. When the first ceramic bushing 609 is installed into the first mounting groove 612, the second limiting rib 613 and the third limiting groove 614 cooperate to fix the first ceramic bushing 609 and the bearing bracket 604 relative to each other. Understandably, the first ceramic bushing 609 and the bearing bracket 604 can move relative to each other in the axial direction to install or remove the first ceramic bushing 609 into the first mounting groove 612. The fact that the first ceramic bushing 609 and the bearing bracket 604 are relatively fixed by the action of the second limiting rib 613 and the third limiting groove 614 means that the first ceramic bushing 609 cannot rotate in the first mounting groove 612. This can prevent the first ceramic bushing 609 from rotating with the output shaft 601, thereby reducing the friction between the first ceramic bushing 609 and the bearing bracket 604.

[0043] Please refer to Figures 1-4In a further preferred embodiment, at least one first water inlet groove 615 is also formed on the inner wall surface of the first mounting groove 612. The first water inlet groove 615 extends to the gap between the bearing bracket 604 and the output shaft 601, so that fluid enters the first water inlet groove 615 through the gap between the bearing bracket 604 and the output shaft 601 for fluid lubrication of the first ceramic bushing 609. It can be understood that the output shaft 601 is confined in the first ceramic bushing 609 when passing through the bearing bracket 604, so the output shaft 601 and the bearing bracket 604 are not in direct contact, and there is a gap between them, through which water can flow to the first ceramic bushing 609. The first water inlet channel 615 extends from the side wall of the first mounting groove 612 to the top wall and communicates with the gap. In this way, based on the water inlet hole 607, water can also flow through the first water inlet channel 615, pass through the first ceramic bushing 609, and enter the fourth receiving cavity 605. This enables water circulation in the fourth receiving cavity 605, which helps to improve the efficiency of water circulation in the fourth receiving cavity 605 and prevents water from accumulating in the fourth receiving cavity 605.

[0044] Please refer to Figures 1-4 In this embodiment, a second mounting groove 616 is provided at the bottom of the fourth receiving cavity 605, and the second ceramic bushing 610 is installed in the second mounting groove 616. At least one protruding third limiting rib 617 is provided on the inner wall surface of the second mounting groove 616, and a fourth limiting groove 618 corresponding to the third limiting rib 617 is provided on the outer wall surface of the second ceramic bushing 610. When the second ceramic bushing 610 is installed into the second mounting groove 616, the third limiting rib 617 and the fourth limiting groove 618 cooperate to fix the second ceramic bushing 610 and the pump housing assembly 602 relative to each other. Understandably, the second ceramic bushing 610 and the second mounting groove 616 can move relative to each other in the axial direction to install or remove the second ceramic bushing 610 into the second mounting groove 616. The second ceramic bushing 610 and the bearing bracket 604 are relatively fixed by the third limiting rib 617 and the fourth limiting groove 618, which means that the second ceramic bushing 610 cannot rotate in the second mounting groove 616. This can prevent the second ceramic bushing 610 from rotating with the output shaft 601, thereby reducing the friction between the second ceramic bushing 610 and the pump housing assembly 602.

[0045] In a further preferred embodiment, at least one second water inlet groove 619 is also formed on the inner wall surface of the second mounting groove 616. The second water inlet groove 619 extends from the inner sidewall of the second mounting groove 616 to the bottom surface, so that fluid can pass through the second water inlet groove 619 for fluid lubrication of the second ceramic bushing 610. It can be understood that the second water inlet groove 619 can increase the circulating water flow rate at the second ceramic bushing 610 to fully lubricate the connection between the second ceramic bushing 610 and the output shaft 601, thereby reducing frictional resistance and noise.

[0046] Please refer to Figures 1-4 In this embodiment, the motor assembly 60 further includes a control board assembly 620 and a mounting bracket 621. The control board assembly 620 is disposed within the fifth receiving cavity 606 and electrically connected to the stator assembly 603, used to connect an external circuit to supply power to the motor assembly 60. The mounting bracket 621 is disposed at the end of the fifth receiving cavity 606 and fixedly connected to the pump housing assembly 602 to seal the fifth receiving cavity 606. It is understood that the control board assembly 620 includes a control circuit board and wiring and connectors for connecting to an external circuit, which are arranged through the mounting bracket 621. In other preferred embodiments, the fifth receiving cavity 606 is further filled with epoxy resin to form an insulating protective layer. This further prevents moisture from the booster device 1 or the environment from entering the fifth receiving cavity 606 and corroding the control board assembly 620, achieving water-electricity separation. Furthermore, it provides better support strength for the pump housing assembly 602 and enhances heat dissipation at the pump housing assembly 602, making the booster device 1 more stable and reliable.

[0047] Please refer to Figures 1-7 Another embodiment of the present invention provides a boosting device 1, which includes a pump cover assembly 50, a boosting mechanism 70, and a motor assembly 60 as described above. The pump cover assembly 50 forms a third receiving cavity 501 at one end facing the motor assembly 60. The boosting mechanism 70 is disposed in the third receiving cavity 501. The output shaft 601 of the motor assembly 60 faces the third receiving cavity 501 and is fixedly connected to the boosting mechanism 70 to drive the boosting mechanism 70 to rotate. The pump cover assembly 50 is fixedly connected to the motor assembly 60.

[0048] The pump cover assembly 50 is provided with an inlet 502 and a drain 503. The inlet 502 and the drain 503 are connected to the third receiving cavity 501, so that the water flows in from the inlet 502 and is pressurized by the pressurizing mechanism 70 before flowing out from the drain 503.

[0049] Please refer to Figures 1-7 In a preferred embodiment, a second recess 622 is provided on the side of the bearing bracket 604 facing the pressurizing mechanism 70, and a snap-fit ​​portion 623 is provided on the end of the output shaft 601 of the motor assembly 60 facing the pressurizing mechanism 70. The pressurizing mechanism 70 is limited in the snap-fit ​​portion 623, and a fluid channel for fluid flow is formed between the pressurizing mechanism 70 and the bearing bracket 604. It can be understood that this fluid channel enables the water flow at the pressurizing mechanism 70 to communicate with the fourth receiving cavity 605 of the motor assembly 60, providing water lubrication for the rotor assembly.

[0050] Please refer to Figures 1-7In a preferred embodiment, the end of the motor assembly 60 facing the pump cover assembly 50 is provided with a sealing groove and a sealing ring 624 disposed in the sealing groove. The pump cover assembly 50 and the motor assembly 60 can be fixed by providing multiple screw holes and screws. When the pump cover assembly 50 and the motor assembly 60 are fixedly connected, the sealing ring 624 is between the two to ensure the sealing of the two.

[0051] Please refer to Figures 1-7 In a preferred embodiment, the motor assembly 60 further includes a snap-fit ​​member 626, which is disposed on the outside of the boosting mechanism 70 and fixedly connected to the output shaft 601 to fix the position of the boosting mechanism 70. It is understood that the output shaft 601 extends upward and passes through the boosting mechanism 70, abutting against the snap-fit ​​portion 623 of the output shaft 601 at the lower end of the boosting mechanism 70 to limit the downward movement range of the boosting mechanism 70. The snap-fit ​​member 626, on the other hand, limits the upward movement range of the boosting mechanism 70. The two work together to fix the position of the boosting mechanism 70, ensuring that the water pressure boosting is not affected by any loosening of the boosting mechanism 70 during operation.

[0052] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of 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.

[0053] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a 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 application. 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 a suitable manner in any 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.

[0054] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A motor assembly, characterized in that, This includes the pump housing assembly, rotor assembly, stator assembly, and bearing support; The pump housing assembly is concave, with the upward-facing end forming a fourth receiving cavity and the downward-facing end forming a fifth receiving cavity. The rotor assembly is housed in the fourth receiving cavity, the stator assembly is housed in the fifth receiving cavity, and the bearing bracket is disposed above the fourth receiving cavity and fixedly connected to the pump housing assembly. The bearing bracket has at least two water inlet holes, which penetrate the bearing bracket in the axial direction and communicate with the fourth receiving cavity.

2. The motor assembly as claimed in claim 1, characterized in that, The rotor assembly includes a rotor, an output shaft fixedly connected to the middle of the rotor, and a first ceramic bushing and a second ceramic bushing disposed at both ends of the rotor. The rotor has a gap with the inner wall of the fourth receiving cavity. The output shaft passes through the second ceramic bushing, the rotor and the first ceramic bushing in sequence and extends upward. The water inlet hole communicates with the gap to form a fluid channel. The fluid channel extends to the second ceramic bushing for fluid lubrication of the second ceramic bushing.

3. The motor assembly as described in claim 2, characterized in that, The rotor has at least one water leakage hole that extends axially through the rotor. The water leakage hole connects to the water inlet and / or the fluid channel and extends to the second ceramic bushing for fluid lubrication of the second ceramic bushing.

4. The motor assembly as described in claim 2, characterized in that, The bearing bracket has a first mounting groove on the side facing the rotor, and the first ceramic bushing is installed in the first mounting groove. The inner wall surface of the first mounting groove is provided with at least one raised second limiting rib, and the outer wall surface of the first ceramic bushing is provided with a third limiting groove corresponding to the second limiting rib. When the first ceramic bushing is installed into the first mounting groove, the second limiting rib and the third limiting groove cooperate to fix the first ceramic bushing relative to the bearing bracket.

5. The motor assembly as described in claim 4, characterized in that, The inner wall surface of the first mounting groove is also provided with at least one first water inlet groove, which extends to the gap between the bearing bracket and the output shaft, so that fluid enters the first water inlet groove through the gap between the bearing bracket and the output shaft for fluid lubrication of the first ceramic bushing.

6. The motor assembly as claimed in claim 2, characterized in that, The bottom of the fourth receiving cavity is provided with a second mounting groove, and the second ceramic bushing is installed in the second mounting groove; The inner wall surface of the second mounting groove is provided with at least one raised third limiting rib, and the outer wall surface of the second ceramic bushing is provided with a fourth limiting groove corresponding to the third limiting rib. When the second ceramic bushing is installed into the second mounting groove, the third limiting rib and the fourth limiting groove cooperate to fix the second ceramic bushing relative to the pump housing assembly.

7. The motor assembly as claimed in claim 6, characterized in that, The inner wall surface of the second mounting groove is also provided with at least one second water inlet groove, which extends from the inner side wall of the second mounting groove to the bottom surface, so that fluid passes through the second water inlet groove for fluid lubrication of the second ceramic bushing.

8. The motor assembly as claimed in claim 1, characterized in that, It also includes a control board assembly and a mounting bracket. The control board assembly is disposed in the fifth receiving cavity and is electrically connected to the stator assembly, and is used to connect an external circuit to supply power to the motor assembly. The mounting bracket is disposed at the end of the fifth receiving cavity and is fixedly connected to the pump housing assembly to seal the fifth receiving cavity.

9. A booster device, characterized in that, The pump cover assembly includes a pump cover assembly, a pressurizing mechanism, and a motor assembly as claimed in any one of claims 1-8. The pump cover assembly forms a third receiving cavity at one end facing the motor assembly. The pressurizing mechanism is disposed in the third receiving cavity. The output shaft of the motor assembly faces the third receiving cavity and is fixedly connected to the pressurizing mechanism to drive the pressurizing mechanism to rotate. The pump cover assembly is fixedly connected to the motor assembly. The pump cover assembly has an inlet and a outlet, which are connected to the third receiving cavity, so that water flows in from the inlet and is pressurized by the pressurizing mechanism before flowing out from the outlet.

10. The pressurization device as described in claim 9, characterized in that, The bearing bracket has a second recess on the side facing the boosting mechanism, and the output shaft of the motor assembly has a snap-fit ​​part on the end facing the boosting mechanism. The boosting mechanism is limited in the snap-fit ​​part, and a fluid channel for fluid flow is formed between the boosting mechanism and the bearing bracket.

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