Impeller assembly, booster pump and water heater

Abstract

The utility model discloses an impeller assembly, a booster pump and a water heater, and relates to the technical field of pump bodies, the impeller assembly comprises a hub, and a first cover plate is connected to the hub; the second cover plate and the first cover plate are arranged at intervals in the axial direction of the hub, the second cover plate is annular and is arranged around the central axis of the hub, a liquid inlet is formed in a space defined by the inner peripheral wall of the second cover plate, and a liquid outlet is defined between the outer peripheral edge of the second cover plate and the outer peripheral edge of the first cover plate; the support is connected to the end, deviating from the second cover plate, of the hub. The first blade is connected between the first cover plate and the second cover plate; the second blade is connected to the side, away from the second cover plate, of the first cover plate. An annular part is arranged on the side, away from the second cover plate, of the first cover plate and connected with the peripheral wall of the hub, the minimum outer diameter of the annular part is larger than or equal to the maximum size of the support in the radial direction of the hub, and the second blades are located on the periphery of the annular part. The impeller assembly can improve the boosting capacity of the booster pump so as to increase the lift.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump body technical field, especially a kind of impeller assembly, booster pump and water heater. BACKGROUND

[0002] Gas water heater is widely used due to its energy saving and convenience. For the residents of higher floor, there is the problem of insufficient water pressure, especially when multiple water is used in the resident's home or water peak, water pressure decreases sharply. Therefore, gas water heater is usually equipped with booster pump to increase water pressure. However, in the related art, the existing booster pump has insufficient boosting capacity, and the gas water heater cannot be started or is difficult to start due to insufficient water pressure, resulting in poor user experience. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. To this end, the utility model provides an impeller assembly that can improve the boosting capacity of the booster pump to increase the lift.

[0004] The utility model further provides a booster pump and a water heater with the above-mentioned impeller assembly.

[0005] According to the impeller assembly of the first aspect of the utility model, the first cover plate is connected to the hub, and the second cover plate is arranged in the axial direction of the hub and surrounds the central axis of the hub. The space surrounded by the inner peripheral wall of the second cover plate forms a liquid inlet, and the outer peripheral edge of the second cover plate and the outer peripheral edge of the first cover plate define a liquid outlet. The first blade is connected between the first cover plate and the second cover plate to fixedly connect the second cover plate and the first cover plate. The second blade is connected to the side of the first cover plate away from the second cover plate. The side of the first cover plate away from the second cover plate is provided with an annular portion, which is connected to the outer peripheral wall of the hub. The minimum outer diameter of the annular portion is greater than or equal to the maximum size of the support in the radial direction of the hub, and the second blade is located at the outer periphery of the annular portion.

[0006] According to the impeller assembly of the first aspect of the utility model, at least the following beneficial effects are achieved: the second blade is additionally arranged on the side of the first cover plate away from the second cover plate, the second blade can work on the fluid on the side of the first cover plate away from the second cover plate, the fluid is re-pressurized, the pressure of the fluid when being discharged is effectively increased, the pressurizing capacity of the booster pump is improved, the lift is increased, the water pressure requirement of the water heater is met, and the user experience is improved. Meanwhile, since the second blade is located on the outer periphery of the annular part, and the minimum outer diameter of the annular part is greater than or equal to the maximum size of the support in the radial direction of the hub, when being processed, the support effectively avoids hindering the second blade from being demolded from the corresponding forming die, and the manufacturability is improved.

[0007] According to some embodiments of the utility model, the second blade extends from the outer peripheral wall of the annular part to the outer periphery of the first cover plate, the maximum outer diameter of the first cover plate is D0, the minimum outer diameter of the annular part is D1, and the following condition is met: 0.3≤D1 / D0<1.

[0008] According to some embodiments of the utility model, the second blade extends linearly from inside to outside in the radial direction of the hub or extends curvedly around the central axis of the hub.

[0009] And / or, the first blade extends linearly from inside to outside in the radial direction of the hub or extends curvedly around the central axis of the hub.

[0010] According to some embodiments of the utility model, the number of the first blades and the number of the second blades are both multiple, the multiple first blades are arranged at intervals in the circumferential direction of the first cover plate, the multiple second blades are arranged at intervals in the circumferential direction of the first cover plate, the number of the first blades is N1, the number of the second blades is N2, and the following conditions are met: 0.4≤N1 / N2≤5; and / or, 4≤N1≤10; and / or, 2≤N2≤10.

[0011] According to some embodiments of the utility model, at least part of the first blades and at least part of the second blades are arranged staggered in the circumferential direction of the first cover plate, the staggered angle of the first blades and the second blades arranged adjacent and staggered in the circumferential direction of the first cover plate is θ, and the following condition is met: 0°<θ≤45°.

[0012] According to some embodiments of the utility model, the annular part is provided with a balance hole, and the balance hole penetrates the end face of the first cover plate on the side facing the second cover plate and the end face of the annular part on the side away from the second cover plate.

[0013] According to some embodiments of the utility model, in the axial direction of the hub, the thickness of the annular part is greater than or equal to the thickness of the second blade.

[0014] According to some embodiments of the present application, the two side walls of the first blade along the circumference of the first cover plate are parallel to the central axis of the hub.

[0015] And / or, the two side walls of the second blade along the circumference of the first cover plate are parallel to the central axis of the hub.

[0016] According to some embodiments of the present application, the hub, the first cover plate, the bracket, the first blade and the second blade are integrally formed, and the second cover plate is welded with the first blade.

[0017] According to some embodiments of the present application, the impeller assembly further comprises a magnetic ring sleeved on the bracket, the magnetic ring is integrally injection molded with the bracket, and the minimum outer diameter of the annular portion is greater than or equal to the maximum outer diameter of the magnetic ring.

[0018] According to some embodiments of the present application, the maximum outer diameter of the first cover plate is D0, the minimum inner diameter of the liquid inlet is D2, and along the axial direction of the hub, the width of the liquid outlet is W, which satisfies: 0.3≤D2 / D0≤0.5; and / or, 0.02≤W / D0≤0.1.

[0019] The booster pump according to the second aspect of the present application comprises the impeller assembly according to the first aspect of the present application.

[0020] The booster pump according to the second aspect of the present application has at least the following beneficial effects: the booster pump adopts the above-mentioned impeller assembly, a second blade is additionally arranged on the side of the first cover plate away from the second cover plate, the second blade can work on the fluid located on the side of the first cover plate away from the second cover plate, the fluid is re-pressurized, the pressure of the fluid when being discharged is effectively increased, the pressurizing capacity of the booster pump is improved, the lift is increased, the water pressure requirement of the water heater is met, and the user experience is improved. At the same time, since the second blade is located at the outer periphery of the annular portion, and the minimum outer diameter of the annular portion is greater than or equal to the maximum size of the bracket along the radial direction of the hub, when being processed, the bracket effectively avoids hindering the second blade from being demolded from the corresponding forming mold, and the manufacturability is improved.

[0021] According to some embodiments of the present application, the rotational speed range of the impeller assembly is 5000rpm-10000rpm.

[0022] The water heater according to the third aspect of the present application comprises the booster pump according to the second aspect of the present application.

[0023] The water heater has at least the following beneficial effects: the water heater adopts the booster pump, the second blade is additionally arranged on the side of the first cover plate away from the second cover plate, the second blade can work on the fluid on the side of the first cover plate away from the second cover plate, the fluid is re-pressurized, the pressure of the fluid when being discharged is effectively increased, the pressurizing capacity of the booster pump is improved, the lift is increased, the water pressure requirement of the water heater is met, and the user experience is improved. Meanwhile, the second blade is located at the outer periphery of the annular portion, and the minimum outer diameter of the annular portion is greater than or equal to the maximum size of the bracket along the radial direction of the hub, when being processed, the bracket does not hinder the second blade from being demolded from the corresponding forming die, and the manufacturability is improved.

[0024] Additional aspects and advantages of the present application will be set forth in part in the following description, and in part will become apparent to those skilled in the art upon examination of the following description, or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0026] Figure 1 is a sectional view of the booster pump in the embodiment of the present application;

[0027] Figure 2 is a structural schematic view of the impeller assembly in the embodiment of the present application;

[0028] Figure 3 is Figure 2 the sectional view of the impeller assembly;

[0029] Figure 4 is a structural schematic view of the impeller assembly from a first perspective when the magnetic ring and the shaft sleeve are not installed in the embodiment of the present application;

[0030] Figure 5 is a structural schematic view of the impeller assembly from a second perspective when the magnetic ring and the shaft sleeve are not installed in the embodiment of the present application;

[0031] Figure 6 is a sectional view of the impeller assembly when the magnetic ring and the shaft sleeve are not installed in the embodiment of the present application;

[0032] Figure 7 is a structural schematic view of the impeller assembly when the magnetic ring and the shaft sleeve are not installed in another embodiment of the present application;

[0033] Figure 8 is an axial partial sectional view of the impeller assembly when the magnetic ring and the shaft sleeve are not installed in the embodiment of the present application.

[0034] Reference signs:

[0035] Hub 100; shaft hole 110; groove 120;

[0036] First cover plate 200; annular part 210; balance hole 211; first space 220;

[0037] Second cover plate 300; conical ring plate 310; annular side plate 320; liquid inlet 330; liquid outlet 340;

[0038] Support 400; limiting part 410; mounting part 420; inner hole 430;

[0039] First blade 500;

[0040] Second blade 600;

[0041] Pump shell 700; shielding sleeve 710; first inner cavity 711; second inner cavity 712; stator 720; third inner cavity 730; fluid inlet 740; fluid outlet 750; second space 760; magnetic ring 770; shaft sleeve 780. DETAILED DESCRIPTION

[0042] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for the purpose of explaining the present application, and cannot be understood as limiting the present application.

[0043] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application. The device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0044] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0045] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, assembling, cooperating, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0046] With reference to Figures 1 to 8 The utility model discloses a first aspect embodiment provides a kind of impeller assemblies, it is applied to the booster pump of water heater, for enhancing the pressure boosting capacity of booster pump, to satisfy the water pressure requirement of water heater, improve the starting performance and use experience of water heater, improve the experience of user.This water heater can be gas water heater or electric water heater etc.

[0047] With reference to Figures 4 to 6 It can be understood that the impeller assembly includes a hub 100, a first cover plate 200, a second cover plate 300, a bracket 400, first vanes 500, and second vanes 600.

[0048] With reference to Figures 4 to 6 It can be understood that the hub 100 has a shaft hole 110 in the middle, which is used to install a rotating shaft. The hub 100 has a central axis, the direction of the central axis of the hub 100 is the axial direction of the hub 100, the direction perpendicular to the central axis of the hub 100 and from the inside to the outside and its reverse direction is the radial direction of the hub 100, and the direction around the central axis of the hub 100 is the circumferential direction of the first cover plate 200.

[0049] Continuing to refer to Figures 4 to 6 It can be understood that the first cover plate 200 is an annular plate and is connected to the outer peripheral wall of the hub 100, i.e., the first cover plate 200 is arranged around the hub 100, and the central axis of the first cover plate 200 coincides with the central axis of the hub 100.

[0050] Continuing to refer to Figures 4 to 6 It can be understood that the second cover plate 300 is located on one side of the first cover plate 200 along the axial direction of the hub 100, and the second cover plate 300 is arranged at a distance from the first cover plate 200 in the axial direction of the hub 100, and a first space 220 is defined between the first cover plate 200 and the second cover plate 300. Generally, the second cover plate 300 is annular and arranged around the central axis of the hub 100, and the central axis of the second cover plate 300 coincides with the central axis of the first cover plate 200. The second cover plate 300 includes a conical ring plate 310 and an annular side plate 320, the central axis of the conical ring plate 310 is the central axis of the second cover plate 300, the distance between the conical ring plate 310 and the first cover plate 200 in the axial direction of the hub 100 decreases outwardly in the radial direction of the hub 100, and the annular side plate 320 is connected to the inner periphery of the conical ring plate 310 and extends in the axial direction of the hub 100 away from the first cover plate 200. The second cover plate 300 is provided with a liquid inlet 330, which is the space surrounded by the inner peripheral wall of the conical ring plate 310 and the inner peripheral wall of the annular side plate 320.

[0051] Continuing to refer to Figures 4 to 6It can be understood that the first vane 500 is connected between the first cover plate 200 and the second cover plate 300, specifically, the first vane 500 is connected between the first cover plate 200 and the conical ring plate 310 of the second cover plate 300, that is, the first vane 500 is located in the first space 220. The first vane 500 is arranged in the radial direction of the hub 100.

[0052] With reference to the first vane 500 Figures 4 to 6 It can be understood that generally, the outer diameter of the first cover plate 200 is equal to the outer diameter of the second cover plate 300, and the outer diameter of the second cover plate 300 is the outer diameter of the conical ring plate 310. The outer periphery of the first cover plate 200 and the outer periphery of the second cover plate 300 define the liquid outlet 340, that is, the liquid outlet 340 is an opening in the first space 220 between the first cover plate 200 and the second cover plate 300 towards the radial outside of the hub 100.

[0053] With reference to the first vane 500 Figure 6 It can be understood that the maximum outer diameter of the first cover plate 200 is defined as D0, the minimum inner diameter of the liquid inlet 330 is defined as D2, the distance between the outer periphery of the first cover plate 200 and the outer periphery of the second cover plate 300 in the axial direction of the hub 100 is the width of the liquid outlet 340, and the width of the liquid outlet 340 is W.

[0054] It can be understood that the maximum outer diameter D0 of the first cover plate 200 and the minimum inner diameter D2 of the liquid inlet 330 satisfy: 0.3≤D2 / D0≤0.5. In this way, under the premise that the maximum outer diameter of the first cover plate 200 is constant, the minimum inner diameter of the liquid inlet 330 can be within a suitable range to meet the flow requirement of the impeller assembly and avoid the problem of vortex of fluid at the liquid inlet 330 due to the too large liquid inlet 330, thereby improving the efficiency. Therefore, 0.3≤D2 / D0≤0.5, for example, the value of D2 / D0 is 0.3, 0.34, 0.41, 0.45, 0.49, etc., under the premise of meeting the flow requirement, the efficiency is improved.

[0055] It can be understood that the maximum outer diameter D0 of the first cover plate 200 and the width W of the liquid outlet 340 satisfy 0.02≤W / D0≤0.1. Under the premise that the maximum outer diameter of the first cover plate 200 is constant, when W / D0<0.02, the width of the liquid outlet 340 is too small, resulting in insufficient flow; when W / D0>0.1, the width of the liquid outlet 340 and the size of the first space 220 in the axial direction are too large, and the flow of the fluid is insufficient to fill the first space 220 and the liquid outlet 340, resulting in vortex and reduced efficiency. Therefore, 0.02≤W / D0≤0.1, for example, the value of W / D0 is 0.02, 0.03, 0.042, 0.075, 0.09, etc., to improve the efficiency under the premise of meeting the flow requirement. In the embodiment, the width of the liquid outlet 340 is 1mm to 4mm, for example, 2mm or 3mm, etc., to ensure the output flow of the fluid and improve the efficiency.

[0056] It can be understood that in other embodiments, the maximum outer diameter D0 of the first cover plate 200, the minimum inner diameter D2 of the liquid inlet 330 and the width W of the liquid outlet 340 can only satisfy one of 0.3≤D2 / D0≤0.5 and 0.02≤W / D0≤0.1.

[0057] It can be understood that when the impeller assembly rotates, the fluid enters the first space 220 from the liquid inlet 330, and the first blade 500 rotates around the central axis of the hub 100 as the impeller assembly rotates. The first blade 500 pushes the fluid in the first space 220 to rotate around the central axis of the hub 100, i.e., the first blade 500 does work on the fluid in the first space 220, and the fluid is discharged through the liquid outlet 340 under the action of centrifugal force, thereby realizing the pressurization of the fluid. The fluid here can be water, oil, etc.

[0058] Referring to Figures 4 to 6 It can be understood that the bracket 400 is connected to the end of the hub 100 away from the second cover plate 300. Specifically, the bracket 400 has a sleeve structure and has a central axis, the central axis of the bracket 400 coincides with the central axis of the hub 100, and the bracket 400 is provided with an inner hole 430 in communication with the shaft hole 110. It can be easily understood that the bracket 400 is used for mounting the magnetic ring 770.

[0059] Continuing to refer to Figures 4 to 6In the present example, the bracket 400 includes a limiting portion 410 and a mounting portion 420 connected in sequence along the axial direction of the hub 100, wherein the limiting portion 410 is connected with the hub 100. The maximum outer diameter D3 of the limiting portion 410 is greater than the maximum outer diameter D4 of the mounting portion 420, and thus the maximum dimension of the bracket 400 along the radial direction of the hub 100 is the maximum outer diameter D3 of the limiting portion 410. Generally, the maximum outer diameter D3 of the limiting portion 410 is greater than the outer diameter D5 of the hub 100. The magnetic ring 770 is sleeved on the mounting portion 420, and the limiting portion 410 limits the magnetic ring 770 in the axial direction of the hub 100. The outer peripheral walls of the limiting portion 410 and the mounting portion 420 are both cylindrical surfaces, and thus the maximum outer diameter D3 of the limiting portion 410 is the outer diameter of any position of the limiting portion 410, and the maximum outer diameter D4 of the mounting portion 420 is the outer diameter of any position of the mounting portion 420.

[0060] Of course, the outer peripheral walls of the limiting portion 410 and the mounting portion 420 can also be surfaces of other shapes.

[0061] Referring to FIG. 2, Figures 4 to 6 It can be understood that the side of the first cover plate 200 facing away from the second cover plate 300 is provided with an annular portion 210, and the annular portion 210 is arranged around the hub 100 and connected with the outer peripheral wall of the hub 100.

[0062] Referring to FIG. 2, Figures 4 to 6 It can be understood that the minimum outer diameter D1 of the annular portion 210 is greater than or equal to the maximum dimension of the bracket 400 along the radial direction of the hub 100. In the present embodiment, that is, the minimum outer diameter D1 of the annular portion 210 is greater than or equal to the maximum outer diameter D3 of the limiting portion 410. Specifically, the minimum outer diameter D1 of the annular portion 210 is greater than the maximum outer diameter D3 of the limiting portion 410. That is, in the radial direction of the hub 100, the bracket 400 does not protrude out of the outer peripheral wall of the annular portion 210. It can also be understood that, in the projection plane perpendicular to the axial direction of the hub 100, the projection of the bracket 400 is located inside the projection of the outer peripheral wall of the annular portion 210. It is easy to understand that the outer peripheral wall of the annular portion 210 is a cylindrical surface, and the minimum outer diameter D1 of the annular portion 210 is the outer diameter of any position of the annular portion 210.

[0063] In other embodiments, the minimum outer diameter D1 of the annular portion 210 can also be equal to the maximum outer diameter D3 of the limiting portion 410, and at this time, the bracket 400 also does not protrude out of the outer peripheral wall of the annular portion 210.

[0064] In other embodiments, the maximum outer diameter D3 of the limiting portion 410 is equal to the outer diameter D5 of the hub 100. The minimum outer diameter D1 of the annular portion 210 is greater than the maximum outer diameter D3 of the limiting portion 410. That is, the annular portion 210 protrudes out of the outer peripheral wall of the limiting portion 410. That is, at this time, the bracket 400 also does not protrude out of the outer peripheral wall of the annular portion 210.

[0065] Referring to Figures 4 to 6 As shown in the drawings, it can be understood that in any of the above embodiments, the second blade 600 is connected to the side of the first cover plate 200 away from the second cover plate 300, and the second blade 600 is located at the outer periphery of the annular portion 210. For example, the second blade 600 is connected to the outer peripheral wall of the annular portion 210, or the second blade 600 is arranged in the radial direction of the hub 100 and spaced apart from the outer peripheral wall of the annular portion 210.

[0066] It can be understood that, for the convenience of processing, the hub 100, the first cover plate 200 (including the annular portion 210), the bracket 400, the first blade 500 and the second blade 600 are integrally formed, and the second cover plate 300 is welded with the first blade 500. Specifically, the hub 100, the first cover plate 200, the bracket 400, the first blade 500 and the second blade 600 are integrally formed by an injection molding process so as to simultaneously form the first blade 500 and the second blade 600. The second cover plate 300 is connected with the first blade 500 by means of fusion welding, so that the hub 100, the first cover plate 200 (including the annular portion 210), the bracket 400, the first blade 500, the second blade 600 and the second cover plate 300 form an integral whole.

[0067] Referring to Figures 4 to 6 As shown in the drawings, it can be understood that in this example, the maximum outer diameter D3 of the limiting portion 410 is greater than the outer diameter D5 of the hub 100, and the outer peripheral wall of the hub 100 and the annular portion 210 form a groove 120 with the limiting portion 410. When injection molding, the groove 120 is formed by two half-ring molds.

[0068] It can be easily understood that when demolding, the second blade 600 is separated from the corresponding forming mold in the axial direction of the hub 100, that is, the corresponding forming mold of the second blade 600 and the bracket 400 are relatively moved in the axial direction of the hub 100. Since the second blade 600 is located at the outer periphery of the annular portion 210, and the minimum outer diameter of the annular portion 210 is greater than or equal to the maximum dimension of the bracket 400 in the radial direction of the hub 100, therefore, when forming, the corresponding forming mold of the second blade 600 is located at the outer periphery side of the bracket 400, and when demolding, the bracket 400 and the corresponding forming mold of the second blade 600 can be avoided in the axial direction of the hub 100. Therefore, the bracket 400 can effectively avoid hindering the second blade 600 from being demolded from the corresponding forming mold, and the manufacturability is improved.

[0069] It can be easily understood that after the second blade 600 is demolded from the corresponding forming mold, it can be moved away from the two half-ring molds used to form the groove 120.

[0070] It can be understood that, for the convenience of processing, generally speaking, the thickness of the annular portion 210 is greater than or equal to the thickness of the second blade 600 in the axial direction of the hub 100, and the process of cutting the annular portion 210 after injection molding is omitted. In this embodiment, the thickness of the annular portion 210 is equal to the thickness of the second blade 600, and the processing is more convenient.

[0071] It can be understood that the thickness of the second blade 600 is equal in the axial direction of the hub 100. The thickness of the second blade 600 is defined as the width of the outlet end of the second blade 600. The width of the outlet end of the second blade 600 is 1mm to 4mm to ensure the output flow of the fluid.

[0072] Referring to Figure 2 and Figure 3 It can be understood that the magnetic ring 770 is sleeved on the mounting portion 420 of the bracket 400. The impeller assembly further comprises a shaft sleeve 780 installed in the inner hole 430 of the bracket 400. The magnetic ring 770 and the shaft sleeve 780 are integrally injection molded with the bracket 400. Specifically, when the hub 100, the first cover plate 200, the bracket 400, the first blade 500 and the second blade 600 are integrally injection molded, the magnetic ring 770 and the shaft sleeve 780 are first positioned in the mold, and then the molten plastic is injected into the mold. After the plastic is cooled and formed, the magnetic ring 770 and the shaft sleeve 780 are embedded together with the bracket 400, so that the hub 100, the first cover plate 200, the bracket 400, the first blade 500 and the second blade 600 are integrally injection molded with the magnetic ring 770 and the shaft sleeve 780. The process of installing the magnetic ring 770 and the shaft sleeve 780 later is omitted, which is convenient for production, and the bracket 400 is stably and reliably connected with the magnetic ring 770 and the shaft sleeve 780.

[0073] Referring to Figure 3 It can be understood that the minimum outer diameter D1 of the annular portion 210 is greater than or equal to the maximum outer diameter D6 of the magnetic ring 770. In this embodiment, the minimum outer diameter D1 of the annular portion 210 is greater than the maximum outer diameter D6 of the magnetic ring 770. In this way, during molding, the corresponding molding mold of the second blade 600 is located on the outer peripheral side of the magnetic ring 770, and during demolding, the magnetic ring 770 and the corresponding molding mold of the second blade 600 are prevented from interfering in the axial direction of the hub 100, thereby effectively preventing the magnetic ring 770 from hindering the demolding of the second blade 600 from the corresponding molding mold, and improving the manufacturability.

[0074] Referring to Figure 1As shown, it can be understood that in the booster pump, generally speaking, the booster pump at least comprises a pump shell 700, a shield sleeve 710 and a stator 720, the shield sleeve 710 is arranged at a first inner cavity 711 and a second inner cavity 712 arranged around the outer periphery of the first inner cavity 711, the opening of the first inner cavity 711 is opposite to the opening of the second inner cavity 712, and the stator 720 is installed in the second inner cavity 712. The pump shell 700 is connected with the shield sleeve 710 and located at the opening end of the first inner cavity 711, the pump shell 700 is provided with a third inner cavity 730 and a fluid inlet 740 and a fluid outlet 750 communicating with the third inner cavity 730, wherein the third inner cavity 730 communicates with the first inner cavity 711. The impeller assembly is rotatably installed in the first inner cavity 711 and the third inner cavity 730, wherein the bracket 400 provided with the magnetic ring 770 is located in the first inner cavity 711, the first cover plate 200 is located in the third inner cavity 730 and is arranged in the axial direction of the hub 100 and is spaced apart from the shield sleeve 710, and the second space 760 is defined between the first cover plate 200 and the shield sleeve 710, and the second blade 600 is located in the second space 760. It can be easily understood that the fluid inlet 740 is located at one end of the impeller assembly in the axial direction of the hub 100, and the fluid outlet 750 is located at one side of the impeller assembly in the radial direction of the hub 100.

[0075] It can be understood that during the operation of the booster pump, the recess 120 can accommodate part of the foreign matter in the fluid, thereby avoiding the problem that the foreign matter enters between the shield sleeve 710 and the magnetic ring 770 and causes the impeller to be stuck.

[0076] Therefore, under the action of the magnetic field of the stator 720 and the magnetic ring 770, the impeller assembly rotates around the central axis of the hub 100, the fluid enters the first space 220 from the fluid inlet 740 through the liquid inlet 330, is pressurized by the first blade 500, and under the action of the centrifugal force, the fluid flows to the third inner cavity 730 through the liquid outlet 340, at this time, part of the fluid is located in the second space 760, with the rotation of the impeller assembly, the second blade 600 rotates around the central axis of the hub 100 and pushes the fluid in the second space 760 to rotate around the central axis of the hub 100, the second blade 600 does work on the fluid in the second space 760 and pressurizes again, and the pressurized fluid is discharged through the fluid outlet 750. In this way, the pressure of the effectively pressurized fluid discharged is effectively increased, the pressurizing capacity of the booster pump is improved, and the lift is increased to meet the water pressure requirement of the water heater and improve the user experience.

[0077] Referring to Figure 4As shown, it can be understood that in the embodiment, the second vane 600 extends from the outer peripheral wall of the annular portion 210 to the outer periphery of the first cover plate 200 in the radial direction of the hub 100. That is, the second vane 600 and the annular portion 210 cover the space of the first cover plate 200 in the radial direction of the hub 100. On the premise that the maximum outer diameter of the annular portion 210 is constant, the size of the second vane 600 in the radial direction of the hub 100 is maximized. Therefore, the area of the two side walls of the second vane 600 away from each other in the circumferential direction of the first cover plate 200 can be increased, the work of the second vane 600 on the fluid can be increased, the supercharging effect can be enhanced, and the lift can be further increased.

[0078] Referring to Figure 6 As shown, it can be understood that the maximum outer diameter D0 of the first cover plate 200 and the minimum outer diameter D1 of the annular portion 210 satisfy: 0.3≤D1 / D0<1.

[0079] It can be easily understood that on the premise that the maximum outer diameter of the first cover plate 200 is constant, when D1 / D0<0.3, the minimum outer diameter D1 of the annular portion 210 is too small. Since the shaft hole 110 is provided in the middle of the annular portion 210, and the minimum outer diameter D1 of the annular portion 210 is greater than or equal to the maximum outer diameter D3 of the limiting portion 410, this will result in that the wall thickness of the annular portion 210 in the radial direction and the wall thickness of the limiting portion 410 in the radial direction are too thin, and the structural strength is poor. D1 / D0<1 is used to ensure the size of the second vane 600 in the radial direction of the hub 100 and ensure the supercharging effect.

[0080] Therefore, 0.3≤D1 / D0<1, for example, the value of D1 / D0 is 0.3, 0.4, 0.43, 0.5, 0.7, 0.95, etc. On the premise of ensuring the structural strength of the impeller assembly, the supercharging effect is enhanced, and the lift is increased.

[0081] It can be easily understood that in the embodiment, the maximum outer diameter D0 of the first cover plate 200 is 35-55mm, for example, D0=38mm, D0=42mm, D0=50mm or D0=53mm, etc. The maximum outer diameter D0 of the first cover plate 200 can be designed according to different power. On the premise that other dimensions are the same, the larger the D0 is, the greater the power is.

[0082] Referring to Figure 6 As shown, it can be understood that the first vane 500 extends from the liquid inlet 330 to the liquid outlet 340 in the radial direction of the hub 100, which can improve the supercharging capacity of the first vane 500 and effectively increase the lift. Here, it will not be described again.

[0083] It can be understood that the side close to the central axis of the hub 100 is defined as the inner side, and the side away from the central axis of the hub 100 is defined as the outer side. The first vane 500 can be a straight-line structure or a backward-swept structure.

[0084] Specifically, the first blade 500 has an in-line structure, meaning that the first blade 500 extends in a straight line from the inside to the outside along the radial direction of the hub 100. In other words, in the projection plane perpendicular to the central axis of the hub 100, the projection of the first blade 500 along the circumferential edges of the first cover plate 200 is a straight line extending radially along the hub 100. The structure of the first blade 500 is simpler.

[0085] The first blade 500 has a swept-back structure, meaning that the first blade 500 extends and curves around the central axis of the hub 100. In other words, in the projection plane perpendicular to the central axis of the hub 100, the projection of the first blade 500 along the circumferential edges of the first cover plate 200 is a curve that curves around the central axis of the hub 100. The curve can be an arc or part of a spiral, etc.

[0086] It is understood that in this embodiment, the first blade 500 has a swept-back structure, which can increase the area of ​​the two sidewalls of the first blade 500 that are circumferentially opposite to each other along the first cover plate 200, enhance the pressurization effect, and thus further increase the head.

[0087] It is understandable that the second blade 600 can be an in-line structure or a swept-back structure.

[0088] Reference Figure 7 As shown, specifically, the second blade 600 has an in-line structure, meaning that the second blade 600 extends in a straight line from the inside to the outside along the radial direction of the hub 100. In other words, in a projection plane perpendicular to the central axis of the hub 100, the projection of the second blade 600 along the circumferential edges of the first cover plate 200 is a straight line extending radially along the hub 100. The structure of the second blade 600 is simpler.

[0089] Reference Figure 4 As shown, the second blade 600 has a swept-back structure, meaning that the second blade 600 extends and curves around the central axis of the hub 100. In other words, in the projection plane perpendicular to the central axis of the hub 100, the projection of the second blade 600 along the circumferential edges of the first cover plate 200 is a curve that curves around the central axis of the hub 100. The curve can be an arc or part of a spiral, etc.

[0090] Reference Figure 4 As shown, it can be understood that in this embodiment, the second blade 600 has a swept-back structure, which can increase the area of ​​the two sidewalls of the second blade 600 that are circumferentially opposite to each other along the first cover plate 200, enhance the pressurization effect, and thus further increase the head.

[0091] In some other embodiments, the first vanes 500 are of a straight-line structure, and the second vanes 600 can be of a straight-line structure; or the first vanes 500 are of a straight-line structure, and the second vanes 600 can be of a backward-swept structure; or the first vanes 500 are of a backward-swept structure, and the second vanes 600 can be of a straight-line structure.

[0092] Referring to Figures 4 to 6 As shown in the drawings, it can be understood that the number of the first vanes 500 and the number of the second vanes 600 are both plural. Specifically, the plural first vanes 500 are arranged equidistantly along the circumference of the first cover plate 200. The plural second vanes 600 are arranged equidistantly along the circumference of the first cover plate 200. The number of the first vanes 500 is defined as N1, and the number of the second vanes 600 is defined as N2, which satisfy: 0.4≤N1 / N2≤5. When the number of the first vanes 500 is constant, N1 / N2≥0.4 can avoid that the number of the second vanes 600 is too large, thereby avoiding the problem that the space between adjacent two second vanes 600 is too small to cause the pressure boosting effect to be reduced, and can avoid wasting materials. N1 / N2≤5 can avoid that the number of the second vanes 600 is too small to cause the pressure boosting effect to be poor. Therefore, 0.4≤N1 / N2≤5 can determine the number of the second vanes 600 according to the number of the first vanes 500, so that the number of the second vanes 600 is within an appropriate range, to enhance the pressure boosting effect, increase the lift, and reduce the material cost.

[0093] Referring to Figures 4 to 6 As shown in the drawings, it can be understood that the number of the first vanes 500 is 4 to 10, and the number of the second vanes 600 is 2 to 10. The number of the first vanes 500 and the number of the second vanes 600 can be any combination. It is only required to satisfy at least one of the conditions of 0.4≤N1 / N2≤5, 4≤N1≤10, and 2≤N2≤10.

[0094] In this embodiment, the number of the first vanes 500 N1 and the number of the second vanes 600 N2 satisfy 0.4≤N1 / N2≤5, 4≤N1≤10, and 2≤N2≤10 at the same time. For example, N1=5, N2=2; or N1=8, N2=4; or N1=8, N2=8; or N1=10, N2=6, etc.

[0095] In this embodiment, the number of the first vanes 500 and the number of the second vanes 600 are both 8. In this way, the pressure boosting capacity can be enhanced, the lift can be increased, and the cost can be reduced.

[0096] Referring to Figures 4 to 6As shown, it can be understood that the first blades 500 and the second blades 600 will inevitably vibrate during rotation of the impeller assembly. When the vibration frequencies of the first blades 500 and the second blades 600 superimpose, resonance will occur, and the noise will be loud. Therefore, the plurality of first blades 500 and the plurality of second blades 600 are alternately and spacedly arranged along the circumference of the first cover plate 200. That is, the first blades 500 and the second blades 600 are staggered in the circumferential direction of the first cover plate 200. It can also be understood that the projection of the first blade 500 and the projection of the second blade 600 at least partially do not coincide in the projection plane perpendicular to the central axis of the hub 100. In this way, the risk of resonance of the first blade 500 and the second blade 600 can be reduced, thereby reducing the noise.

[0097] In other embodiments, it can be understood that a part of the first blades 500 and a part of the second blades 600 are staggered in the circumferential direction of the first cover plate 200, and another part of the first blades 500 and another part of the second blades 600 coincide in the projection plane perpendicular to the central axis of the hub 100. In this way, the risk of resonance of the first blade 500 and the second blade 600 can also be reduced to a certain extent, thereby reducing the noise.

[0098] Referring to Figure 8 As shown, it can be understood that for the first blade 500 and the second blade 600 arranged staggered and adjacent in the circumferential direction of the first cover plate 200, the staggered angle θ of the first blade 500 and the second blade 600 is defined, which satisfies: 0° < θ ≤ 45°. In the projection plane perpendicular to the central axis of the hub 100, the staggered angle θ of the first blade 500 and the second blade 600 can be understood as the included angle between the line connecting the outer end of the first blade 500 and the projection of the central axis of the hub 100 and the line connecting the outer end of the second blade 600 and the projection of the central axis of the hub 100. By making 0° < θ ≤ 45°, the staggered part of the first blade 500 and the second blade 600 can be increased, thereby reducing the risk of resonance of the first blade 500 and the second blade 600, and further reducing the noise. For example, θ = 21°, θ = 26°, θ = 30°, θ = 36°, or θ = 43°, etc.

[0099] In this embodiment, the number of the first blades 500 and the second blades 600 is 8, and the 8 first blades 500 and the 8 second blades 600 are alternately and equally spacedly arranged along the circumference of the first cover plate 200, therefore, θ = 22.5°. The risk of resonance of the first blade 500 and the second blade 600 can be reduced, thereby reducing the noise.

[0100] It can be understood that in other embodiments, the first vane 500 and the second vane 600 can also be partially staggered in the radial direction of the hub 100. For example, the first vane 500 extends from the liquid inlet 330 to the liquid outlet 340 in the radial direction of the hub 100, and the second vane 600 extends from the outer peripheral wall of the annular portion 210 to the outer peripheral edge of the first cover plate 200 in the radial direction of the hub 100. In this way, the risk of resonance between the first vane 500 and the second vane 600 is also reduced to some extent, thereby reducing noise.

[0101] Referring to Figure 1 , in combination Figures 4 to 6 It can be understood that when the impeller assembly rotates, the pressure of the fluid in the second space 760 is greater than the pressure of the fluid in the first space 220, and the impeller assembly will move axially along the hub 100, resulting in noise. Therefore, the annular portion 210 is provided with a balance hole 211, and the two ends of the balance hole 211 respectively communicate with the spaces on both sides of the first cover plate 200 in the axial direction of the hub 100. That is, in the axial direction of the hub 100, the two ends of the balance hole 211 respectively penetrate the wall surface of the side of the annular portion 210 facing away from the first vane 500 and the wall surface of the side of the first cover plate 200 facing the second cover plate 300, and the balance hole 211 communicates the first space 220 and the second space 760. In this way, during rotation of the impeller, the fluid in the second space 760 can flow to the first space 220 through the balance hole 211 to balance the pressure on both sides of the impeller assembly in the axial direction of the hub 100, reduce the risk of movement, and thus reduce noise. In the present embodiment, the number of balance holes 211 is multiple, and the multiple balance holes 211 are arranged equidistantly in the circumferential direction of the first cover plate 200. In this way, the balance ability can be enhanced, and the noise can be reduced.

[0102] Referring to Figures 4 to 6 It can be understood that the two side walls of the first vane 500 facing away from each other in the circumferential direction of the first cover plate 200 are parallel to the central axis of the hub 100. In this way, when the first vane 500 is demolded, the first vane 500 and the corresponding molding die move away from each other in the axial direction of the hub 100, facilitating demolding.

[0103] Similarly, referring to Figures 4 to 6 It can be understood that the two side walls of the second vane 600 facing away from each other in the circumferential direction of the first cover plate 200 are parallel to the central axis of the hub 100. In this way, when the second vane 600 is demolded, the second vane 600 and the corresponding molding die move away from each other in the axial direction of the hub 100, facilitating demolding.

[0104] Referring to Figures 4 to 6As shown, it can be understood that, in the embodiment, the two side walls of the first blade 500 along the circumference of the first cover plate 200 are opposite to each other, the two side walls of the second blade 600 along the circumference of the first cover plate 200 are opposite to each other, and the center axis of the hub 100 is parallel to the two side walls, thereby facilitating demolding.

[0105] The booster pump of the second aspect embodiment of the utility model comprises the impeller assembly of the first aspect embodiment of the utility model.

[0106] The booster pump adopts all the technical solutions of the impeller assembly of the above-mentioned embodiments, and thus at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments.

[0107] It can be understood that the maximum lift of the booster pump adopting the impeller assembly of the embodiment is up to 18 m, the maximum lift is increased by 20%, and the pressurization effect is good. Thanks to the increase of the lift, the booster pump of the embodiment can achieve the same lift at a lower speed, and the speed can be reduced by 10% under the same lift. At the same time, the power of the booster pump can be increased to 90 W.

[0108] It can be understood that the speed range of the impeller assembly of the booster pump is 5000 rpm-10000 rpm, for example, the speed of the impeller assembly is 6500 rpm, 7000 rpm, 7300 rpm, 7500 rpm, 8000 rpm, 8500 rpm, etc., so as to meet the pressurization requirement of the booster pump and enhance the pressurization effect.

[0109] The water heater of the third aspect embodiment of the utility model comprises the booster pump of the second aspect embodiment of the utility model.

[0110] The water heater adopts all the technical solutions of the booster pump of the above-mentioned embodiments, and thus at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments.

[0111] The utility model embodiments are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of ordinary skilled persons in the art without departing from the purpose of the utility model.

Claims

1. An impeller assembly, characterized by The impeller assembly comprises: a hub; a first cover plate connected to the hub; a second cover plate spaced from the first cover plate in the axial direction of the hub, the second cover plate being annular and arranged around the central axis of the hub, a space surrounded by the inner peripheral wall of the second cover plate being formed with a liquid inlet, and a liquid outlet being defined between the outer peripheral edge of the second cover plate and the outer peripheral edge of the first cover plate; a support connected to one end of the hub away from the second cover plate; a first vane connected between the first cover plate and the second cover plate to fixedly connect the second cover plate to the first cover plate; a second vane connected to one side of the first cover plate away from the second cover plate; wherein one side of the first cover plate away from the second cover plate is provided with an annular portion, the annular portion is connected to the outer peripheral wall of the hub, and the minimum outer diameter of the annular portion is greater than or equal to the maximum dimension of the support in the radial direction of the hub, and the second vane is located at the outer periphery of the annular portion.

2. The impeller assembly of claim 1, wherein: The second vane extends from the outer peripheral wall of the annular portion to the outer peripheral edge of the first cover plate, the maximum outer diameter of the first cover plate is D0, the minimum outer diameter of the annular portion is D1, and 0.3≤D1 / D0<1 is satisfied.

3. The impeller assembly of claim 1 or 2, wherein: The second vane extends linearly from inside to outside in the radial direction of the hub or curvedly extends around the central axis of the hub; and / or, the first vane extends linearly from inside to outside in the radial direction of the hub or curvedly extends around the central axis of the hub.

4. The impeller assembly of claim 1 or 2, wherein: The number of the first vanes and the number of the second vanes are both multiple, multiple first vanes are arranged in the circumferential direction of the first cover plate, multiple second vanes are arranged in the circumferential direction of the first cover plate, the number of the first vanes is N1, the number of the second vanes is N2, and 0.4≤N1 / N2≤5 is satisfied; and / or, 4≤N1≤10 is satisfied; and / or, 2≤N2≤10 is satisfied.

5. The impeller assembly of claim 4, wherein: At least part of the first vanes and at least part of the second vanes are arranged staggered in the circumferential direction of the first cover plate, the staggered angle of the first vanes and the second vanes arranged adjacent and staggered in the circumferential direction of the first cover plate is θ, and 0°<θ≤45° is satisfied.

6. The impeller assembly of claim 1, wherein: The annular portion is provided with a balance hole, two ends of the balance hole penetrating through the end face of the first cover plate toward the side of the second cover plate and the end face of the annular portion away from the second cover plate, respectively.

7. The impeller assembly of claim 1, wherein: In the axial direction of the hub, the thickness of the annular portion is greater than or equal to the thickness of the second vane.

8. The impeller assembly of claim 1, wherein: The two side walls of the first vane away from each other in the circumferential direction of the first cover plate are parallel to the central axis of the hub; and / or, the two side walls of the second vane away from each other in the circumferential direction of the first cover plate are parallel to the central axis of the hub.

9. The impeller assembly of claim 1, wherein: The hub, the first cover plate, the support, the first vane and the second vane are integrally formed, and the second cover plate is welded to the first vane.

10. The impeller assembly of claim 9, wherein: The impeller assembly further comprises a magnetic ring sleeved on the support, the magnetic ring is integrally injection molded with the support, and the minimum outer diameter of the annular portion is greater than or equal to the maximum outer diameter of the magnetic ring.

11. The impeller assembly of claim 1, wherein: The maximum outer diameter of the first cover plate is D0, the minimum inner diameter of the liquid inlet is D2, and the width of the liquid outlet is W along the axial direction of the hub, satisfying: 0.3≤D2 / D0≤0.5; and / or, 0.02≤W / D0≤0.

1.

12. A booster pump characterized by The impeller assembly of any one of claims 1 to 11.

13. The booster pump of claim 12, wherein: The rotational speed of the impeller assembly is in the range of 5000 rpm-10000 rpm.

14. A water heater characterised by The booster pump of claim 12 or 13. The booster pump of claim 12 or 13.

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