A dual-stage supercharging device and water heater

Abstract

The utility model provides a kind of two-stage supercharging device, it includes pump cover assembly, supercharging mechanism and motor assembly, the third accommodating cavity is formed to the one end of the motor assembly towards the pump cover assembly, the supercharging mechanism is arranged in the third accommodating cavity, the pump cover assembly is fixedly connected with the motor assembly;Water inlet and drain are opened on the pump cover assembly, the water inlet and the drain are communicated with the third accommodating cavity, so that water flow enters from the water inlet and flows out from the drain after being supercharged by the supercharging mechanism, the supercharging mechanism includes primary impeller and secondary impeller, the output shaft of the motor assembly is towards the third accommodating cavity and is fixedly connected with the primary impeller and the secondary impeller, to drive the primary impeller and the secondary impeller synchronous rotation.

Description

Technical Field

[0001] This utility model belongs to the technical field of booster device equipment, specifically relating to a two-stage booster device and a water heater. 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 ensures that the pipes are always kept in a hot water state.

[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] Therefore, it is necessary to design a booster device with better boosting effect and higher reliability. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a two-stage booster device and water heater with good boosting effect and high reliability.

[0006] This utility model provides a two-stage booster device, which includes a pump cover assembly, a booster mechanism and a motor assembly. The pump cover assembly forms a third receiving cavity at one end facing the motor assembly. The booster mechanism is disposed in the third receiving cavity. The pump cover assembly is fixedly connected to the motor assembly.

[0007] The pump cover assembly has an inlet and an outlet, which are connected to the third receiving cavity, allowing water to enter through the inlet, be pressurized by the pressurizing mechanism, and then flow out through the outlet.

[0008] The booster mechanism includes a primary impeller and a secondary impeller. The output shaft of the motor assembly faces the third receiving cavity and is fixedly connected to the primary impeller and the secondary impeller to drive the primary impeller and the secondary impeller to rotate synchronously.

[0009] Preferably, the device further includes a guide vane mechanism and an inner support. The inner support includes a first accommodating cavity and a second accommodating cavity arranged opposite to each other on both sides. The opening directions of the first accommodating cavity and the second accommodating cavity are opposite. A partition is provided between the first accommodating cavity and the second accommodating cavity. A first connecting hole is provided in the middle of the partition for connecting the first accommodating cavity and the second accommodating cavity. The guide vane mechanism is disposed in the first accommodating cavity and is detachably connected to the inner support.

[0010] Preferably, the guide vane mechanism includes a guide vane body and a plurality of first blades and second blades respectively disposed on both sides of the guide vane body, wherein the first blades and the second blades protrude outward relative to the guide vane body;

[0011] The guide vane body has a first mounting cavity in the middle of one side facing the first blade, and a plurality of the first blades are arranged around the first mounting cavity. The first-stage impeller is arranged in the first mounting cavity. The second-stage impeller is arranged in the second receiving cavity. The first-stage impeller is connected to the second-stage impeller through the guide vane mechanism and the inner support.

[0012] Preferably, the first blade is arc-shaped, with a first end extending to the first mounting cavity and a second end extending to the outer periphery of the guide vane body; the first end of the first blade is located in the middle of an adjacent first blade, and two adjacent first blades form a first flow channel;

[0013] The second blade is arc-shaped, with the first end of the second blade extending to the middle of the guide vane body and the second end extending to the outer periphery of the guide vane body, and two adjacent second blades forming a second flow channel;

[0014] The second end of the first blade is disposed adjacent to the second end of the second blade.

[0015] Preferably, the first guide channel includes an inlet end near the middle of the guide vane body and an outlet end near the outer periphery of the guide vane body, wherein the throat end face area of ​​the inlet end is smaller than the outlet end face area of ​​the outlet end.

[0016] Preferably, the first-stage impeller has a first inlet at its end and multiple first outlets on its outer periphery. The first inlet is connected to the first outlet. Multiple third blades are provided inside the first-stage impeller. Adjacent third blades form a third flow channel to guide the water inlet from the first inlet to the first outlet.

[0017] The second-stage impeller has a second inlet at its end and multiple second outlets on its outer periphery. The second inlet and the second outlet are connected. Multiple fourth blades are provided inside the second-stage impeller. Adjacent fourth blades form a fourth flow channel to guide the water inlet from the second inlet to the second outlet.

[0018] The guide vane mechanism connects the first outlet and the second inlet to guide the water from the first-stage impeller to the second-stage impeller.

[0019] Preferably, the radial diameter D of the first inlet of the first-stage impeller is... 11 The diameter D of the second inlet of the second-stage impeller in the radial direction is smaller than that of the second inlet of the second-stage impeller. 12 ; and / or,

[0020] The opening width B of the first outlet of the first-stage impeller in the axial direction 21 The opening width B of the second outlet of the secondary impeller in the axial direction is smaller than that of the second outlet of the secondary impeller. 22 ; and / or,

[0021] The diameter D of the first-stage impeller in the radial direction 21 Smaller than the radial diameter D of the second-stage impeller 22 .

[0022] Preferably, the motor assembly includes a pump housing assembly, a rotor assembly, a stator assembly, and a bearing bracket;

[0023] 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.

[0024] 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.

[0025] 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.

[0026] This utility model also provides a water heater, which includes a water heater body and a two-stage booster device as described in any of the above claims. The two-stage booster device is water-connected to the water heater body through a water pipe. The two-stage booster device is also electrically connected to the water heater body. The water heater body can control the start / stop of the two-stage booster device.

[0027] Compared to existing technologies, the two-stage booster device and water heater in this solution have at least the following beneficial effects:

[0028] The two-stage booster provided in this solution uses a booster mechanism that includes a first-stage impeller and a second-stage impeller to boost the water flow entering the booster. In this way, a greater boost of water flow is achieved without changing the power of the booster, resulting in a better boosting effect. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the booster device provided in an embodiment of the present invention;

[0031] Figure 2 This is an exploded structural diagram of the booster device provided in an embodiment of the present invention;

[0032] Figure 3 An exploded view of the pressurization device provided in an embodiment of the present invention;

[0033] Figure 4 This is a cross-sectional schematic diagram of the booster device provided in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the water flow direction of the booster device provided in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram showing the connection between the inner support and the guide vane mechanism provided in an embodiment of the present invention;

[0036] Figure 7 A schematic diagram of the separation structure of the inner support and guide vane mechanism provided in an embodiment of the present invention;

[0037] Figure 8 A schematic diagram of the separation structure of the inner support and guide vane mechanism in another direction provided in an embodiment of the present invention;

[0038] Figure 9 A front view of the guide vane mechanism provided in an embodiment of the present invention;

[0039] Figure 10 This is a schematic diagram of the guide vane mechanism provided in an embodiment of the present invention;

[0040] Figure 11 This is a schematic diagram of the guide vane mechanism from the rear direction provided in an embodiment of the present invention;

[0041] Figure 12 A schematic diagram of the structure of a first-stage impeller provided in an embodiment of the present invention;

[0042] Figure 13 A side view of the first-stage impeller provided in an embodiment of the present invention;

[0043] Figure 14 A cross-sectional schematic diagram of a first-stage impeller provided in an embodiment of the present invention;

[0044] Figure 15 This is a schematic diagram of the structure of a secondary impeller provided in an embodiment of the present invention;

[0045] Figure 16 A side view of the secondary impeller provided in an embodiment of the present invention;

[0046] Figure 17 A cross-sectional schematic diagram of the connection state between the first-stage impeller and the second-stage impeller provided in an embodiment of the present invention;

[0047] Figure 18 An exploded view of a motor assembly provided in an embodiment of the present invention;

[0048] Figure 19 This 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;

[0049] Figure 20 This is a schematic diagram of the structure of the bearing bracket and the first ceramic bushing provided in an embodiment of the present invention;

[0050] Figure 21 A cross-sectional schematic diagram of the pump casing assembly and rotor assembly provided in an embodiment of the present invention;

[0051] Figure 22 This is a schematic diagram of the pump cover assembly provided in an embodiment of the present invention.

[0052] Figure 23 A comparison diagram of the flow efficiency of the two-stage booster device and the single-stage booster pump provided in the embodiments of the present invention;

[0053] Figure 24 A comparison diagram of flow rate and head between the two-stage booster device and the single-stage booster pump provided in the embodiments of the present invention.

[0054] Reference numerals: 1-Boosting device, 10-Guide vane mechanism, 101-Guide vane body, 102-First blade, 103-Second blade, 104-First mounting cavity, 105-First flow channel, 106-Inlet end, 107-Outlet end, 108-Throat end face, 109-Outlet end face, 110-First mounting hole, 111-Second flow channel, 112-First limiting rib, 20-Inner support, 201-First receiving cavity, 202-Second receiving cavity, 203-Baffle, 204-First connecting hole 205-Third outlet, 206-First limiting groove, 207-Second limiting groove, 208-Fourth limiting rib, 30-First stage impeller, 301-First inlet, 302-First outlet, 303-Third blade, 304-Third guide channel, 305-First boss, 306-First connecting hole, 40-Second stage impeller, 401-Second inlet, 402-Second outlet, 403-Fourth blade, 404-Fourth guide channel, 405-Second boss, 406-Second connecting hole, 40 7-Recessed platform, 50-Pump cover assembly, 501-Third receiving cavity, 502-Water inlet, 503-Drain outlet, 504-Fourth limiting groove, 505-Fifth limiting groove, 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-Snap-fit ​​part, 624-Sealing ring, 625-Gasket, 626-Snap-fit ​​piece, 627-Fourth limiting groove, 628-Guide cylinder assembly, 629-Temperature sensor, 630-Water flow sensor, 70-Pressure boosting mechanism. Detailed Implementation

[0055] 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.

[0056] 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.

[0057] 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.

[0058] Please refer to Figures 1-22This utility model provides a two-stage booster device, which includes a pump cover assembly 50, a booster mechanism 70, and a motor assembly 60. The end of the pump cover assembly 50 facing the motor assembly forms a third receiving cavity 501. The booster mechanism 70 is disposed in the third receiving cavity 501. The pump cover assembly 50 is fixedly connected to the motor assembly 60. The pump cover assembly 50 has an inlet 502 and an outlet 503, which are connected to the third receiving cavity 501. Water flows in from the inlet 502, is boosted by the booster mechanism 70, and then flows out from the outlet 503. The booster mechanism 70 includes a first-stage impeller 30 and a second-stage impeller 40. The output shaft 601 of the motor assembly 60 faces the third receiving cavity 501 and is fixedly connected to the first-stage impeller 30 and the second-stage impeller 40 to drive the first-stage impeller 30 and the second-stage impeller 40 to rotate synchronously. Understandably, the first-stage impeller 30 and the second-stage impeller 40 are fixedly connected to the output shaft 601 of the motor assembly 60 and housed in the third receiving cavity 501. When the water flows through the first-stage impeller 30 and the second-stage impeller 40 respectively, it will be pressurized. In this way, the water flow can be pressurized twice by a single motor assembly 60 without increasing the power of the motor assembly. The pressurization effect is better and the economic benefits are also better.

[0059] Please refer to Figures 1-11 In this embodiment, the dual-stage booster mechanism also includes a guide vane mechanism 10 and an inner support 20. The first-stage impeller 30, the guide vane mechanism 10, and the second-stage impeller 40 are connected in sequence. The first-stage impeller 30 has a first inlet 301 at its end and multiple first outlets 302 on its outer periphery. The first inlet 301 and the first outlet 302 are connected. Multiple third blades 303 are provided inside the first-stage impeller 30. Adjacent third blades 303 form a third flow channel 304 to guide the water inlet from the first inlet 301 to the first outlet 302. It can be understood that the end of the first-stage impeller 30 refers to the end of the first-stage impeller 30 facing the water inlet direction when in use, and the opposite side is the bottom of the first-stage impeller 30. The outer periphery of the first-stage impeller 30 refers to the side wall of the first-stage impeller 30 in the axial direction. Multiple first outlets 302 are provided around the side wall of the first-stage impeller 30, and the first outlets 302 are spaced apart. When the water flows into the first impeller 30 from the first inlet 301, it is diverted by multiple third blades 303 and flows along the third guide channel 304 to the first outlet 302, thus completing the first pressurization in the first impeller 30.

[0060] The second-stage impeller 40 has a second inlet 401 at its end and multiple second outlets 402 on its outer periphery. The second inlet 401 and the second outlet 402 are connected. Multiple fourth blades 403 are provided inside the second-stage impeller 40. Adjacent fourth blades 403 form a fourth guide channel 404 to guide the water inlet from the second inlet 401 to the second outlet 402. It can be understood that, similar to the first-stage impeller 30, the end of the second-stage impeller 40 refers to the end of the second-stage impeller 40 facing the water inlet direction when in use, that is, the side facing the first-stage impeller 30. The opposite side is the bottom of the first-stage impeller 30. The outer periphery of the second-stage impeller 40 refers to the side wall of the second-stage impeller 40 in the axial direction. Multiple second outlets 402 are provided around the side wall of the second-stage impeller 40, and the second outlets 402 are spaced apart. When the water flows into the secondary impeller 40 from the second inlet 401, it is diverted by multiple fourth blades 403 and flows along the fourth guide channel 404 to the second outlet 402, thus completing the second pressurization in the secondary impeller 40.

[0061] The guide vane mechanism 10 connects the first outlet 302 and the second inlet 401 to guide the water flow from the first-stage impeller 30 to the second-stage impeller 40. It can be understood that after passing through the first-stage impeller 30, the water flow direction is towards the outer periphery of the first-stage impeller 30. Since the second inlet 401 of the second-stage impeller 40 is located at the end, it is necessary to converge the water flow that has undergone the first pressurization at the second inlet 401 of the second-stage impeller 40. This improves water flow efficiency and avoids attenuation of the water flow rate. The guide vane mechanism 10 is positioned between the first outlet 302 and the second inlet 401, guiding the water flowing from the first outlet 302 towards the second inlet 401.

[0062] Please refer to Figures 1-11 In this embodiment, the guide vane mechanism 10 includes a guide vane body 101 and a plurality of first blades 102 and second blades 103 respectively disposed on both sides of the guide vane mechanism 10. Two adjacent first blades 102 form a first flow channel 105, and two adjacent second blades 103 form a second flow channel 111. The first flow channel 105 and the second flow channel 111 are correspondingly connected on the outer periphery of the guide vane mechanism 10. A third flow channel 304, the first flow channel 105, the second flow channel 111, and the fourth flow channel 404 form a second water flow channel. It can be understood that the first blades 102 and the second blades 103 are respectively disposed on both sides of the guide vane body 101 and protrude outward relative to the guide vane body 101. Here, "outward" refers to the direction away from the guide vane body 101.

[0063] Furthermore, a first mounting cavity 104 is provided in the middle of one side of the guide vane body 101 facing the first blade 102. A plurality of first blades 102 are arranged around the first mounting cavity 104. The first blades 102 are arc-shaped. The first end of the first blade 102 extends to the first mounting cavity 104 and the second end extends to the outer periphery of the guide vane body 101. The first end of the first blade 102 is located in the middle of an adjacent first blade 102. Two adjacent first blades 102 form a first flow channel 105. The second blade 103 is arc-shaped. The first end of the second blade 103 extends to the middle of the guide vane body 101 and the second end extends to the outer periphery of the guide vane body 101. The second end of the first blade 102 is arranged adjacent to the second end of the second blade 103. Understandably, the first blade 102 extends from the periphery of the first mounting cavity 104 to the outer periphery of the guide vane body 101; the first end of the first blade 102 is located in the middle of the adjacent first blade 102, where the middle refers to the middle area of ​​the length of the first blade 102, and is not limited to the exact middle position of the length of the first blade 102; while the second blade 103 extends outward from the middle of the guide vane body 101 to the outer periphery of the guide vane body 101, and the second ends of the first blade 102 and the second ends of the second blade 103 are adjacent to each other on the outer periphery of the guide vane body 101, and a second flow channel 111 is formed between the adjacent second blades 103, that is, the first flow channel 105 and the second flow channel 111 are connected on the outer periphery of the guide vane body 101, so that the water flowing through the first flow channel 105 can be guided to the second flow channel 111.

[0064] Please refer to Figures 1-11In this embodiment, the first guide channel 105 includes an inlet end 106 near the middle of the guide vane body 101 and an outlet end 107 near the outer periphery of the guide vane body 101. The area of ​​the throat end face 108 of the inlet end 106 is smaller than the area of ​​the outlet end face 109 of the outlet end 107. Thus, when the water flows from the inlet end 106 to the outlet end 107, the radial area for fluid introduction increases, allowing the water to flow smoothly to the radial surface, resulting in better diffusion and significantly improved efficiency. It can be understood that the throat end face 108 is the end face where the first end of the first blade 102 intersects with the axial plane containing the axis of the guide vane mechanism 10 and the adjacent first blade 102, and the outlet end face 109 is the end face where the second end of the first blade 102 intersects with the outer periphery plane of the guide vane mechanism 10 and the adjacent first blade 102. The throat end face 108 includes a throat plane width a3 and a throat axial width b3, which satisfy the following relationship: a3:b3 = (0.8~1.0):1. Preferably, a3 / b3 can be 0.8, 0.9, 1.0, etc. The outlet end face 109 includes an outlet flow width a4 and an outlet flow depth b4, which satisfy the following relationship: a4:b4 = (0.8~1.0):1. a4 / b4 can be 0.8, 0.9, 1.0, etc. Furthermore, the area of ​​the throat end face 108 of the inlet end 106 is F3, and the area of ​​the outlet end face 109 of the outlet end 107 is F4. It can be understood that F3 = a3 * b3 and F4 = a4 * b4. In this embodiment, F3 and F4 satisfy the following relationship: F4:F3 = (2.0 ~ 2.2):1. Specifically, F4 / F3 can be 2.0, 2.1, 2.2, etc. By optimizing the structure and ratio of the inlet end 106 and outlet end 107 of the first guide channel 105, the crowding phenomenon of water flow in the guide vane mechanism 10 can be reduced, thereby maintaining a good water flow rate before and after the water flows through the guide vane mechanism 10, and preventing attenuation during the guiding process.

[0065] Please refer to Figures 1-5 , Figures 12-17 In this embodiment, the first-stage impeller 30 is disposed within the first mounting cavity 104 of the guide vane mechanism 10, and the first outlet 302 of the first-stage impeller 30 corresponds to the inlet end 106 of the first guide channel 105 of the guide vane mechanism 10, so that the water pressurized by the first-stage impeller 30 flows smoothly into the first guide channel 105. Preferably, the thickness of the first-stage impeller 30 in the axial direction corresponds to the depth of the first mounting cavity 104 in the same direction, so that the first-stage impeller 30 does not protrude relative to the first mounting cavity 104. This ensures that the water flow from the first-stage impeller 30 can flow out of the first guide channel 105 without impacting other areas and causing turbulence.

[0066] In a further preferred embodiment, the flow area of ​​the first guide channel 105 gradually increases from the first mounting cavity 104 towards the outer periphery of the guide vane body 101. This means the inner diameter of the first guide channel 105 gradually increases as it extends from the inlet end 106 to the outlet end 107. This allows the water flow in the first guide channel 105 to form a better diffusion zone, improving efficiency while maintaining water flow rate. Conversely, the flow area of ​​the second guide channel 111 gradually decreases from the second end of the second blade 103 towards the first end, and multiple second guide channels 111 are connected at the middle of the guide vane body 101. This means the inner diameter of the second guide channel 111 gradually decreases as it extends from the outer periphery of the guide vane body 101 towards the middle of the guide vane body 101. This allows water flow from multiple directions to be converged and guided to the same location, further increasing water pressure during the convergence process.

[0067] Please refer to Figures 1-11 In this embodiment, a first mounting hole 110 is provided in the middle of the guide vane body 101, penetrating the guide vane body 101 in the axial direction. The first end of the second blade 103 extends to the first mounting hole 110, and the second end extends to the outer periphery of the guide vane body 101, with the extension direction of the second end tangent to the outlet end face 109 of the first guide channel 105. It can be understood that the process of water flowing through the guide vane mechanism 10 is as follows: water enters the first guide channel 105 and flows out from the outlet end 107 of the first guide channel 105 towards the second guide channel 111. The water then flows along the second guide channel 111 towards the first mounting hole 110 and flows to the next component. Specifically, the secondary impeller 40 is connected to the first mounting hole 110 of the guide vane mechanism 10, and the second inlet 401 is connected to the second guide channel 111. The water flows through the second guide channel 111 and then enters the secondary impeller 40 from the second inlet 401. The second end of the second blade 103 extends in a direction that is tangent to the outlet end face 109 of the first guide channel 105 on the outer periphery of the guide vane body 101, which allows the water to flow smoothly from the first guide channel 105 to the second guide channel 111 without impacting the end of the second blade 103 and causing turbulence in the water flow. This maintains the flow rate of the water in the guide vane mechanism 10.

[0068] In this embodiment, the number of first blades 102 and second blades 103 is 6-7, and the number of third blades 303 and fourth blades 403 is 7-9. Specifically, the number of first blades 102 and second blades 103 is the same, so that the number of first guide channels 105 and second guide channels 111 can correspond, thus avoiding turbulence caused by water impacting obstacles when flowing from the first guide channel 105 to the second guide channel 111. Preferably, the first blades 102 and second blades 103 can be 6 or 7. The number of third blades 303 and fourth blades 403 can be the same or different, such as 7, 8, or 9. In a more preferred embodiment, the number of third blades 303 and fourth blades 403 is greater than the number of first blades 102 and second blades 103. For example, when there are 6 first blades 102 and 103, the third blades 303 and fourth blades 403 can be 7, 8 or 9; when there are 7 first blades 102 and 103, the third blades 303 and fourth blades 403 can be 8 or 9. The reason for this arrangement is that designing the number of blades in the guide vane mechanism 10 between the first-stage impeller 30 and the second-stage impeller 40 to be less than the number of blades in the impeller can reduce the turbine effect of water flow between the first-stage impeller 30 and the second-stage impeller 40, thereby significantly improving efficiency.

[0069] Please refer to Figures 1-11 In this embodiment, the guide vane mechanism 10 and the inner support 20 form a flow guiding mechanism. The inner support 20 includes a first receiving cavity 201 and a second receiving cavity 202 arranged opposite to each other on both sides. The opening directions of the first receiving cavity 201 and the second receiving cavity 202 are opposite. A partition 203 is provided between the first receiving cavity 201 and the second receiving cavity 202. A first connecting hole 204 is provided in the middle of the partition 203 for connecting the first receiving cavity 201 and the second receiving cavity 202. It can be understood that the inner support 20 is recessed inward on both opposite sides to form the first receiving cavity 201 and the second receiving cavity 202. The first receiving cavity 201 and the second receiving cavity 202 are separated by the partition 203. The first connecting hole 204 is provided in the middle of the partition 203 to connect the first receiving cavity 201 and the second receiving cavity 202, so as to transport water flow from the first receiving cavity 201 to the second receiving cavity 202.

[0070] The guide vane mechanism is disposed within the first receiving cavity 201 and detachably connected to the inner support 20. The guide vane mechanism 10 includes a plurality of first blades 102 and second blades 103 respectively disposed on both sides of the guide vane mechanism 10. The first blades 102, second blades 103 and the first connecting hole 204 form a first water flow channel for guiding water flow from the first receiving cavity 201 to the second receiving cavity 202. It can be understood that adjacent first blades 102 form a first flow channel 105, and adjacent second blades 103 form a second flow channel 111. The first flow channel 105, the second flow channel 111 and the first connecting hole 204 form the first water flow channel to smoothly guide the water flow.

[0071] Furthermore, the first-stage impeller 30 is disposed in the first mounting cavity 104 of the guide vane mechanism 10, so that the first-stage impeller 30 and the guide vane mechanism 10 are arranged together in the first receiving cavity 201, while the second-stage impeller 40 is disposed in the second receiving cavity 202. This forms a water flow channel from the first-stage impeller 30 to the guide vane mechanism 10, from the guide vane mechanism 10 to the first connecting hole 204, and from the first connecting hole 204 to the second-stage impeller 40, so that the flow rate and water pressure loss are reduced during the pressurization process of the water flow through the first-stage impeller 30 and the second-stage impeller 40.

[0072] Please refer to Figures 1-11 In this embodiment, the inner support 20 has a third outlet 205 at one end where the second receiving cavity 202 is located. The third outlet 205 penetrates the side wall of the inner support 20 and communicates with the second receiving cavity 202 to discharge water from the side. It is understood that the third outlet 205 communicates with the second receiving cavity 202. As mentioned above, the secondary impeller 40 is disposed in the second receiving cavity 202, and the third outlet 205 is disposed at a position corresponding to the second receiving cavity 202, preferably at a position corresponding to the second outlet 402 of the secondary impeller 40. Thus, after the water is pressurized by the secondary impeller 40, it flows out from the second outlet 402 and is discharged from the third outlet 205. For example, the inner diameter of the second receiving cavity 202 is larger than the outer diameter of the secondary impeller 40. That is, when the secondary impeller 40 is installed in the second receiving cavity 202, there is still a gap between the secondary impeller 40 and the inner wall of the second receiving cavity 202. In this way, the water flowing out from different second outlets 402 can flow through the gap to the third outlet 205 and finally be discharged from the inner support 20. By setting the third outlet 205 on the inner support 20, the pressurized water flow after the second stage can be collected, discharged, and flowed to the external pipeline. This ensures that the pressurized water flow is connected to the external pipeline from one outlet and that the water flow and water pressure are not lost during this process.

[0073] In this embodiment, at least one first blade 102 has a raised first limiting rib 112 on its outer side wall, and the inner peripheral wall of the first receiving cavity 201 has a first limiting groove 206 corresponding to the first limiting rib 112. When the guide vane mechanism 10 is installed into the first receiving cavity 201, the first limiting rib 112 and the first limiting groove 206 cooperate to fix the position of the guide vane mechanism 10 in the first receiving cavity 201. It can be understood that the first limiting rib 112 of the first blade 102 is provided on the outer side wall, which here refers to the side opposite to the first mounting cavity 104. The inner wall of the first receiving cavity 201 has a recessed first limiting groove 206. The first limiting rib 112 and the first limiting groove 206 correspond in size and shape. When the guide vane mechanism 10 is installed into the first receiving cavity 201, the first limiting rib 112 is inserted into the first limiting groove 206 to be locked and fixed, so that the guide vane mechanism 10 will not easily move within the first receiving cavity 201. Preferably, each first blade 102 of the guide vane mechanism 10 is provided with a first limiting rib 112, and the inner peripheral wall of the first receiving cavity 201 is provided with a corresponding number of first limiting grooves 206. This can more effectively fix the position of the guide vane mechanism 10 and maintain normal operation under high flow and high water pressure conditions.

[0074] In this embodiment, the partition 203 has at least one second limiting groove 207 on the side facing the first receiving cavity 201. The shape of the second limiting groove 207 corresponds to the shape of the end of the second blade 103 near the partition 203. When the guide vane mechanism 10 is installed into the first receiving cavity 201, the second blade 103 is inserted into the second limiting groove 207 to fix the position of the guide vane mechanism 10 in the first receiving cavity 201. It can be understood that the shape and size of the second limiting groove 207 correspond to the end of the second blade 103, so that the end of the second blade 103 can be inserted into the second limiting groove 207. This not only serves as a positioning function, but also further ensures that the guide vane mechanism 10 will not easily shift in the first receiving cavity 201.

[0075] Please refer to Figures 12-17 In this embodiment, the opening diameter D of the first inlet 301 of the first-stage impeller 30 in the radial direction is... 11 The radial opening diameter D of the second inlet 401, which is smaller than that of the second-stage impeller 40, is... 12 Understandably, the first inlet 301 generally adopts a regular circular or near-circular opening, such as a polygon approximating a circle, to reduce water flow resistance when entering the impeller. The radial diameter of the first inlet 301 refers to the maximum opening distance of the first inlet 301. Similarly, the second inlet 401 is also a regular circular or near-circular opening. Furthermore, the opening diameter D of the first inlet 301... 11 The opening diameter D of the second inlet 40112 Satisfy the following relationship: D 12 = (1.2~1.4)D 11 Specifically, D 12 / D 11 It can be 1.2, 1.3, 1.4, etc. After the water flow is pressurized by the first-stage impeller 30, the flow velocity and water pressure will increase. Using a second-stage impeller 40 with a larger opening diameter can more smoothly guide the water flow into it, avoiding excessive water pressure at the second inlet 401 of the second-stage impeller 40.

[0076] In a further preferred embodiment, the opening width B of the first outlet 302 of the first-stage impeller 30 in the axial direction is... 21 The opening width B in the axial direction of the second outlet 402, which is smaller than that of the second-stage impeller 40, is... 22 Understandably, the axial opening width of the first outlet 302 and the second outlet 402 refers to the opening width in the thickness direction of the first-stage impeller 30 and the second-stage impeller 40. The opening width B of the second outlet 402 of the second-stage impeller 40... 22 The larger opening allows the water, after being pressurized twice, to flow out of the second outlet 402 more quickly, preventing it from accumulating inside the secondary impeller 40 and causing turbulence. Furthermore, the opening width B of the first outlet 302... 21 The opening width B of the second outlet 402 22 The following relationship must be satisfied: B 22 = (1.2~1.4)B 21 Specifically, B 22 / B 21 It can be 1.2, 1.3, 1.4, etc.

[0077] Please refer to Figures 12-17 In this embodiment, the diameter D of the first-stage impeller 30 in the radial direction is... 21 The radial diameter D of the second-stage impeller is smaller than 40. 22 Understandably, the radial diameters of the primary impeller 30 and the secondary impeller 40 refer to the overall outer diameters of the primary impeller 30 and the secondary impeller 40. The primary impeller 30 and the secondary impeller 40 are generally circular in shape, meaning the secondary impeller 40 is larger than the primary impeller 30. This results in a larger diffusion zone within the secondary impeller 40 compared to the primary impeller 30. Under conditions where the secondary impeller 40 experiences higher inlet water pressure, this allows for better water drainage, preventing pressure concentration within the secondary impeller 40 and ensuring that the increased pressure of the feed water is fully converted into head pressure. Furthermore, the diameter D of the primary impeller 30... 21 With the diameter D of the second-stage impeller 40 22 Satisfy the following relationship: D 22 = (1.2~1.4)D 21Specifically, D 22 / D 21 It can be 1.2, 1.3, 1.4, etc.

[0078] This embodiment employs two impellers with three optimization methods: unequal inlet diameters, unequal outlet widths, and unequal impeller diameters. These three methods can be combined or optimized individually to improve the efficiency of water flow between the two impellers. For example, any one optimization method can be used individually: unequal inlet diameters, unequal outlet widths, or unequal impeller diameters. Alternatively, any two optimization methods can be combined. The optimal method is to use all three optimization methods together, which significantly improves the efficiency of the booster device 1. If two impellers with equal diameters are used, i.e., B... 21 =B 22 D 21 =D 22 D 11 =D 12 When the inlet water flow is low, the water pressure is low due to the small amount of water entering the system. When the first-stage impeller 30 rotates at high speed, it will quickly guide the water into the second-stage impeller 40, causing a break in the water supply at the front end of the first-stage impeller 30, which leads to cavitation. This increases the turbulence at the first inlet 301, resulting in a decrease in the efficiency of the booster device 1. At the same time, the interference of turbulence will also cause sensing distortion in equipment such as the water flow sensor. When the inlet water flow is high, the turbulence at the first inlet 301 of the first-stage impeller 30 will be reduced due to the high inlet water pressure. However, after the water flow is further pressurized at the first-stage impeller 30, the inlet water pressure entering the second-stage impeller 40 will be significantly increased. Due to the limitation of the outlet size at the second outlet 402 of the second-stage impeller 40, the pressure is concentrated inside the second-stage impeller 40 and cannot be fully converted into head pressure. This leads to an increase in the power of the drive components that drive the first-stage impeller 30 and the second-stage impeller 40, but the efficiency of the booster device 1 will decrease.

[0079] In this embodiment, the bottom of the primary impeller 30 is provided with a first protrusion 305 extending toward the secondary impeller 40. A first connecting hole 306 is formed through the center of the first protrusion 305. The secondary impeller 40 is provided with a second protrusion 405 extending from the bottom toward the primary impeller 30. The second protrusion 405 extends from the second inlet 401 of the secondary impeller 40. A second connecting hole 406 is formed through the center of the second protrusion 405. The inner diameters of the first connecting hole 306 and the second connecting hole 406 are the same. When the primary impeller 30 and the secondary impeller 40 are installed, the first connecting hole 306 and the second connecting hole 406 are arranged coaxially. In a further embodiment, a recess 407 is also formed at the end of the second protrusion 405 near the first protrusion 305. The inner diameter of the recess 407 corresponds to the outer diameter of the first protrusion 305, so that the first protrusion 305 can be inserted into the second protrusion 405, thus realizing a rigid connection between the first protrusion 305 and the second protrusion 405. Under normal operating conditions, the primary impeller 30 and the secondary impeller 40 need to be connected to the output shaft 601 of the drive assembly to drive them to rotate. By designing the first connecting hole 306 of the primary impeller 30 and the second connecting hole 406 of the secondary impeller 40 to be coaxial, the output shaft 601 of the drive assembly can be connected to both the primary impeller and the secondary impeller 40 simultaneously, enabling them to rotate synchronously. In a further preferred embodiment, the primary impeller 30 and the secondary impeller 40 are directly connected. When the output shaft 601 is connected to both, it can better ensure that the primary impeller 30 and the secondary impeller 40 rotate synchronously during operation, thus making the water flow smoother and reducing turbulence.

[0080] Please refer to Figures 1-3 , Figures 18-22 The motor assembly 60 provided in this embodiment includes a pump housing assembly 602, a rotor assembly, a stator assembly 603, and a bearing bracket 604;

[0081] 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 4The 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.

[0082] 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.

[0083] Please refer to Figures 18-22 In this 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.

[0084] 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 contact with the two when rotating.

[0085] In 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 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.

[0086] Please refer to Figures 18-22 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.

[0087] In 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 is 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.

[0088] Please refer to Figures 18-22 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.

[0089] 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.

[0090] 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.

[0091] Please refer to Figures 18-22 In this 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.

[0092] In this 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.

[0093] In this 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 for fixing 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.

[0094] In this embodiment, at least one fourth limiting groove 627 is also provided on the inner wall of the third receiving cavity 501 of the pump cover assembly 50. The fourth limiting groove 627 is provided on the bottom wall of the third receiving cavity 501 away from the motor assembly 60. The fourth limiting groove 627 corresponds to the end shape and size of the first blade 102 of the guide vane mechanism 10. When the guide vane mechanism 10 is installed into the third receiving cavity 501, the first blade 102 is inserted into the fourth limiting groove 627 to fix the position of the guide vane mechanism 10 so that the guide vane mechanism 10 is relatively fixed to the pump cover assembly 50. In a further embodiment, a fifth limiting groove 505 is provided on the inner sidewall of the pump cover assembly 50, and a fourth limiting rib 208 corresponding to the fifth limiting groove 505 is provided on the outer peripheral wall of the inner bracket 20. When the inner bracket 20 is installed into the pump cover assembly 50, the fourth limiting rib 208 is inserted into the fifth limiting groove 505 to fix the inner bracket 20 relative to the pump cover assembly 50, thereby preventing the inner bracket 20 from rotating in the third receiving cavity 501.

[0095] Please refer to Figures 1-3 In a preferred embodiment, the two-stage booster device further includes a guide tube assembly 628, which is disposed inside the inlet of the pump cover assembly 50. Water entering from the inlet 502 first passes through the guide tube assembly 628 before entering the third receiving cavity 501. A magnetic rotor is installed inside the guide tube assembly 628, which can sense the water flow rate. In addition, when unguided water enters the booster device, it is prone to generating eddies and turbulence due to pipe bends, pressure fluctuations, etc. The guide tube assembly 628 adopts a streamlined inner wall design, which transforms the water flow from "disordered turbulence" to "ordered laminar flow", ensuring that the water flow enters the subsequent booster stage, such as the first-stage impeller 30, in a uniform and stable manner, reducing energy waste and component impact from the source.

[0096] Please refer to Figures 1-3 In a further preferred embodiment, the pump cover assembly 50 is also provided with a temperature sensor 629 and a water flow sensor 630. The temperature sensor 629 and the water flow sensor 630 extend from the outside of the pump cover assembly 50 to the rear of the guide tube assembly 628, thus enabling real-time detection of the water temperature and inlet flow rate in the booster device, thereby providing data support for the system to determine whether to activate the dual-stage booster device. It is understood that the "rear" in "the two sensors are located behind the guide tube assembly 628" refers to the direction of the inlet water flow; that is, the water flow first passes through the guide tube assembly 628 and then through the two sensors.

[0097] To further illustrate the effect of the two-stage booster device of this utility model embodiment, a flow efficiency comparison test and a head performance comparison test were conducted using a single-stage booster pump with the same motor power and the two-stage booster device of this embodiment. See the comparison diagrams below. Figure 23-24As can be seen from the flow efficiency curves shown in the figure, the overall efficiency of the two-stage booster device in this embodiment is superior to that of a single-stage pump, with a wide high-efficiency range, maintaining efficient operation even in complex user environments. The performance curves also show that, at the same flow rate, the two-stage booster device has a higher head, and at the same head, it delivers a higher flow rate. In practical applications, even with high pipe resistance, it can maintain consistent water flow.

[0098] This utility model embodiment also provides a water heater, which includes a water heater body and a dual-stage booster device as described in any of the above claims. The dual-stage booster device is water-connected to the water heater body through a water pipe and is also electrically connected to the water heater body. The water heater body can control the start / stop of the dual-stage booster device.

[0099] 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.

[0100] 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.

[0101] 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 two-stage booster device, characterized in that, The device includes a pump cover assembly, a pressurizing mechanism, and a motor assembly. 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 pump cover assembly is fixedly connected to the motor assembly. The pump cover assembly has an inlet and an outlet, which are connected to the third receiving cavity, allowing water to enter through the inlet, be pressurized by the pressurizing mechanism, and then flow out through the outlet. The booster mechanism includes a primary impeller and a secondary impeller. The output shaft of the motor assembly faces the third receiving cavity and is fixedly connected to the primary impeller and the secondary impeller to drive the primary impeller and the secondary impeller to rotate synchronously.

2. The two-stage booster device as described in claim 1, characterized in that, It also includes a guide vane mechanism and an inner support. The inner support includes a first accommodating cavity and a second accommodating cavity arranged opposite to each other on both sides. The opening directions of the first accommodating cavity and the second accommodating cavity are opposite. A partition is provided between the first accommodating cavity and the second accommodating cavity. A first connecting hole is provided in the middle of the partition for connecting the first accommodating cavity and the second accommodating cavity. The guide vane mechanism is arranged in the first accommodating cavity and is detachably connected to the inner support.

3. The two-stage booster device as described in claim 2, characterized in that, The guide vane mechanism includes a guide vane body and a plurality of first blades and second blades respectively disposed on both sides of the guide vane body, wherein the first blades and the second blades protrude outward relative to the guide vane body; The guide vane body has a first mounting cavity in the middle of one side facing the first blade, and a plurality of the first blades are arranged around the first mounting cavity. The first-stage impeller is arranged in the first mounting cavity. The second-stage impeller is arranged in the second receiving cavity. The first-stage impeller is connected to the second-stage impeller through the guide vane mechanism and the inner support.

4. The two-stage booster device as described in claim 3, characterized in that, The first blade is arc-shaped, with its first end extending to the first mounting cavity and its second end extending to the outer periphery of the guide vane body; the first end of the first blade is located in the middle of an adjacent first blade, and two adjacent first blades form a first flow channel. The second blade is arc-shaped, with the first end of the second blade extending to the middle of the guide vane body and the second end extending to the outer periphery of the guide vane body, and two adjacent second blades forming a second flow channel; The second end of the first blade is disposed adjacent to the second end of the second blade.

5. The two-stage booster device as described in claim 4, characterized in that, The first guide channel includes an inlet end near the middle of the guide vane body and an outlet end near the outer periphery of the guide vane body, wherein the throat end face area of ​​the inlet end is smaller than the outlet end face area of ​​the outlet end.

6. The two-stage booster device as described in claim 2, characterized in that, The first-stage impeller has a first water inlet at its end and multiple first water outlets on its outer periphery. The first water inlet is connected to the first water outlet. Multiple third blades are provided inside the first-stage impeller. Adjacent third blades form a third flow channel to guide the water inlet from the first water inlet to the first water outlet. The second-stage impeller has a second inlet at its end and multiple second outlets on its outer periphery. The second inlet and the second outlet are connected. Multiple fourth blades are provided inside the second-stage impeller. Adjacent fourth blades form a fourth flow channel to guide the water inlet from the second inlet to the second outlet. The guide vane mechanism connects the first outlet and the second inlet to guide the water from the first-stage impeller to the second-stage impeller.

7. The two-stage booster device as described in claim 6, characterized in that, The radial opening diameter D of the first inlet of the first-stage impeller 11 The diameter D of the second inlet of the second-stage impeller in the radial direction is smaller than that of the second inlet of the second-stage impeller. 12 ; and / or, The opening width B of the first outlet of the first-stage impeller in the axial direction 21 The opening width B of the second outlet of the secondary impeller in the axial direction is smaller than that of the second outlet of the secondary impeller. 22 ; and / or, The diameter D of the first-stage impeller in the radial direction 21 Smaller than the radial diameter D of the second-stage impeller 22 .

8. The two-stage booster device as described in claim 1, characterized in that, The motor assembly includes a pump housing assembly, a rotor assembly, a stator assembly, and a bearing bracket; 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.

9. The two-stage booster device as described in claim 8, 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.

10. A water heater, characterized in that, The device includes a water heater body and a dual-stage booster device as described in any one of claims 1-9. The dual-stage booster device is water-connected to the water heater body via a water pipe and is also electrically connected to the water heater body. The water heater body can control the start / stop of the dual-stage booster device.

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