A two-stage supercharging mechanism and a supercharging device

Abstract

The utility model provides a kind of two-stage supercharging mechanism, including primary impeller, guide vane mechanism and secondary impeller, primary impeller, guide vane mechanism and secondary impeller are sequentially connected;The end portion of primary impeller is equipped with first water inlet and is equipped with a plurality of first water outlet in outer circumferential side, first water inlet is communicated with first water outlet, a plurality of third vane is provided in primary impeller, adjacent third vane forms third flow channel, to guide flow to first water outlet with the water inlet of first water inlet;The end portion of secondary impeller is equipped with second water inlet and is equipped with a plurality of second water outlet in outer circumferential side, second water inlet is communicated with second water outlet, a plurality of fourth vane is provided in secondary impeller, adjacent fourth vane forms fourth flow channel, to guide flow to second water outlet with the water inlet of second water inlet;Guide vane mechanism is communicated first water outlet and second water inlet, to guide flow to secondary impeller with the water outlet of primary impeller.

Description

Technical Field

[0001] This utility model belongs to the technical field of booster device equipment, specifically relating to a two-stage booster mechanism and 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] Therefore, it is necessary to design a pressurization device with a reasonable structure that can increase water flow. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a two-stage booster mechanism and booster device with reasonable structure and good boosting effect.

[0006] This utility model provides a two-stage booster mechanism, which includes a first-stage impeller, a guide vane mechanism, and a second-stage impeller, wherein the first-stage impeller, the guide vane mechanism, and the second-stage impeller are connected in sequence;

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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 .

[0011] Preferably, the opening diameter D of the first water inlet is... 11 The opening diameter D of the second water inlet 12 Satisfy the following relationship: D 12 = (1.2~1.4)D 11 .

[0012] Preferably, the opening width B of the first outlet of the first-stage impeller in the axial direction is... 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 .

[0013] Preferably, the opening width B of the first water outlet 21 The opening width B of the second outlet 22 The following relationship must be satisfied: B 22 = (1.2~1.4)B 21 .

[0014] Preferably, the diameter D of the first-stage impeller in the radial direction is... 21 Smaller than the radial diameter D of the second-stage impeller 22 .

[0015] Preferably, the diameter D of the first-stage impeller 21 The diameter D of the second-stage impeller 22 Satisfy the following relationship: D 22 = (1.2~1.4)D 21 .

[0016] Preferably, the guide vane mechanism includes a plurality of first blades and second blades respectively disposed on both sides of the guide vane mechanism, two adjacent first blades forming a first flow channel, two adjacent second blades forming a second flow channel, the first flow channel and the second flow channel being correspondingly connected on the outer periphery of the guide vane mechanism, and the third flow channel, the first flow channel, the second flow channel and the fourth flow channel forming a second water flow channel.

[0017] Preferably, the number of the first and second blades is 6-7, and the number of the third and fourth blades is 7-9.

[0018] This utility model also provides a booster device, which includes a pump cover assembly, a motor assembly, and a two-stage booster mechanism as described in any of the above claims. One end of the pump cover assembly forms a third receiving cavity, the two-stage booster 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 two-stage booster mechanism to drive the two-stage booster mechanism to rotate, and the pump cover assembly is fixedly connected to the motor assembly.

[0019] 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 dual-stage pressurization mechanism before flowing out from the outlet.

[0020] Compared with existing technologies, the two-stage booster mechanism and booster device of this solution have at least the following advantages:

[0021] 1. The two-stage pressurization mechanism provided in this solution adopts a structure that connects a first-stage impeller, a guide vane mechanism, and a second-stage impeller. After the water flow is pressurized by the first-stage impeller, it is guided by the guide vane mechanism to the second-stage impeller for secondary pressurization, thereby greatly improving the water pressure and water flow rate.

[0022] 2. The further optimized two-stage booster mechanism of this scheme adopts a first-stage impeller and a second-stage impeller with unequal diameters, which makes the water flow more efficient when the water flows through the first-stage impeller and the second-stage impeller. The structure is more reasonable and the overall efficiency of the booster device is higher. Attached Figure Description

[0023] 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.

[0024] Figure 1 A schematic diagram of the flow guiding mechanism provided in this embodiment of the utility model;

[0025] Figure 2 A schematic diagram showing the disassembled flow guiding mechanism provided in an embodiment of this utility model;

[0026] Figure 3 A split view of the flow guiding mechanism provided in an embodiment of this utility model from another angle;

[0027] Figure 4 A front view of the guide vane mechanism provided in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the guide vane mechanism provided in an embodiment of the present utility model;

[0029] Figure 6 A schematic diagram of the guide vane mechanism from the rear direction provided in an embodiment of this utility model;

[0030] Figure 7 A schematic diagram of the structure of the first-stage impeller provided in an embodiment of this utility model;

[0031] Figure 8 A side view of the first-stage impeller provided for an embodiment of this utility model;

[0032] Figure 9 A cross-sectional schematic diagram of the first-stage impeller provided for an embodiment of this utility model;

[0033] Figure 10 A schematic diagram of the structure of the secondary impeller provided in an embodiment of this utility model;

[0034] Figure 11 A side view of the secondary impeller provided in an embodiment of this utility model;

[0035] Figure 12 A cross-sectional schematic diagram of the connection state between the first-stage impeller and the second-stage impeller provided for an embodiment of this utility model;

[0036] Figure 13 This is a schematic diagram of the booster device provided in another embodiment of the present invention;

[0037] Figure 14 Exploded view of a pressurization device provided in another embodiment of this utility model;

[0038] Figure 15 This is a cross-sectional schematic diagram of a booster device provided in another embodiment of the present invention.

[0039] 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, 20 7-Second limiting groove, 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, 407-Concave platform, 50-Pump cover assembly, 501-Third receiving cavity, 502-Inlet, 503-Outlet, 60-Motor assembly, 601-Output shaft. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] Currently, gas water heaters use single-stage centrifugal pumps as their 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. Faced with complex and varied 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 results in noise issues and a poor user experience; increasing the pump size increases the overall size of the water heater, the load on the main control board, and manufacturing costs, while also hindering the miniaturization design requirements of water heaters.

[0043] Please refer to Figures 1-12 This utility model embodiment provides a two-stage booster mechanism, which includes a first-stage impeller 30, a guide vane mechanism 10 and a second-stage impeller 40, which are connected in sequence.

[0044] 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 guide 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.

[0045] 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.

[0046] 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.

[0047] Please refer to Figures 1-6 In a preferred 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.

[0048] 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.

[0049] Please refer to Figures 1-6In a preferred 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, without attenuation during the guiding process.

[0050] Please refer to Figures 1-12 In a preferred 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.

[0051] Please refer to Figures 4-5In 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.

[0052] Please refer to Figures 1-6 In a preferred 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.

[0053] Please refer to Figures 1-12In a preferred 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 corresponds, 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.

[0054] Please refer to Figures 1-6 In a preferred embodiment, a flow guiding mechanism is further included, comprising the aforementioned guide vane mechanism 10 and an inner support 20. The inner support 20 includes a first receiving cavity 201 and a second receiving cavity 202 disposed 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 disposed between the first receiving cavity 201 and the second receiving cavity 202, and 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, and 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.

[0055] The guide vane structure 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.

[0056] 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.

[0057] Please refer to Figures 1-2 In a preferred 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.

[0058] Please refer to Figures 1-6In a preferred 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 located on the outer side wall, which 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 in place, thereby preventing the guide vane mechanism 10 from easily shifting 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.

[0059] In a preferred 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.

[0060] Please refer to Figures 7-12 In a preferred embodiment, the first inlet 301 of the first-stage impeller 30 has an opening diameter D in the radial direction. 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.

[0061] Please refer to Figures 7-12 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.

[0062] Please refer to Figures 7-12 In a preferred 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, 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 21 Specifically, D 22 / D 21 It can be 1.2, 1.3, 1.4, etc.

[0063] 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.

[0064] Please refer to Figures 7-12In a preferred 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.

[0065] Please refer to Figures 1-15 This utility model embodiment also provides a booster device 1, which includes a pump cover assembly 50, a motor assembly 60, a first-stage impeller 30, a second-stage impeller 40, a guide vane mechanism 10, and an inner support 20. One end of the pump cover assembly 50 forms a third receiving cavity 501, in which the first-stage impeller 30, the guide vane mechanism 10, the inner support 20, and the second-stage impeller 40 are disposed. The output shaft 601 of the motor assembly 60 faces the third receiving cavity 501 and passes through the second-stage impeller 40, the guide vane mechanism 10, and the first-stage impeller 30, 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. The pump cover assembly 50 is fixedly connected to the motor assembly 60. It can be understood that the first-stage impeller 30, the second-stage impeller 40, and the guide vane mechanism 10 form a two-stage booster mechanism, while from another angle, the guide vane mechanism 10 and the inner support 20 form a flow guiding mechanism.

[0066] In this embodiment, the pump cover assembly 50 is provided with an inlet 502 and an outlet 503, which are connected to the third receiving cavity 501. Water enters through the inlet 502, is pressurized by the dual-stage pressurization mechanism, and then flows out through the outlet 503. It is understood that after the pump cover assembly 50 is fixedly connected to the motor assembly 60, the first-stage impeller 30, the second-stage impeller 40, the inner support 20, the guide vane mechanism 10, and the output shaft 601 of the motor assembly 60 are housed within the third receiving cavity 501. This ensures that the third receiving cavity 501 has only two openings for water to enter or exit: the inlet 502 and the outlet 503. Therefore, water can only enter through the inlet 502 and only flow out through the outlet 503, guaranteeing that the water flow rate is not lost. Furthermore, the position of the drain outlet 503 corresponds to the third outlet 205 of the inner support 20, so that most of the water flow after the secondary pressurization flows directly to the drain outlet 503, and only a small part flows to the drain outlet 503 along the gap between the secondary impeller 40 and the second receiving cavity 202. This ensures that the water pressure loss of the pressurized water flow is small.

[0067] 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.

[0068] 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.

[0069] 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 mechanism, characterized in that, It includes a primary impeller, a guide vane mechanism, and a secondary impeller, wherein the primary impeller, the guide vane mechanism, and the secondary impeller are connected in sequence; 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.

2. The two-stage booster mechanism as described in claim 1, 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 .

3. The two-stage booster mechanism as described in claim 2, characterized in that, The opening diameter D of the first water inlet 11 The opening diameter D of the second water inlet 12 Satisfy the following relationship: D 12 = (1.2~1.4)D 11 .

4. The two-stage booster mechanism as described in claim 2, characterized in that, 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 .

5. The two-stage booster mechanism as described in claim 4, characterized in that, The opening width B of the first outlet 21 The opening width B of the second outlet 22 The following relationship must be satisfied: B 22 = (1.2~1.4)B 21 .

6. The two-stage booster mechanism as described in claim 4, characterized in that, 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 .

7. The two-stage booster mechanism as described in claim 6, characterized in that, The diameter D of the first-stage impeller 21 The diameter D of the second-stage impeller 22 Satisfy the following relationship: D 22 = (1.2~1.4)D 21 .

8. The two-stage booster mechanism as described in claim 1, characterized in that, The guide vane mechanism includes a plurality of first blades and second blades respectively disposed on both sides of the guide vane mechanism. Two adjacent first blades form a first flow channel, and two adjacent second blades form a second flow channel. The first flow channel and the second flow channel are correspondingly connected on the outer periphery of the guide vane mechanism. The third flow channel, the first flow channel, the second flow channel and the fourth flow channel form a second water flow channel.

9. The two-stage booster mechanism as described in claim 8, characterized in that, The number of the first and second blades is 6-7, and the number of the third and fourth blades is 7-9.

10. A pressurization device, characterized in that, The device includes a pump cover assembly, a motor assembly, and a two-stage booster mechanism as described in any one of claims 1-9. One end of the pump cover assembly forms a third receiving cavity, the two-stage booster 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 two-stage booster mechanism to drive the two-stage booster mechanism to rotate, and 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 dual-stage pressurization mechanism before flowing out from the outlet.

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