Impeller, centrifugal pump and electric appliance

Abstract

The utility model relates to an impeller, a centrifugal pump and an electric appliance. Comprising a cover plate which is provided with a liquid inlet; the supporting plate is arranged opposite to the cover plate; the multiple blades are located between the cover plate and the supporting plate, the multiple blades are distributed around the axis of the liquid inlet at intervals, and a fluid channel is formed between every two adjacent blades; the flow guide part is arranged on the side, facing the cover plate, of the supporting plate and corresponds to the liquid inlet, and the flow guide part is configured to guide fluid flowing in from the liquid inlet into the fluid channel. Through the arrangement of the flow guide part, on one hand, turbulent flow can be reduced, noise can be lowered, and the liquid flowing stability can be improved, on the other hand, the flow guide part can absorb part of vibration and impact generated after fluid enters, abrasion caused by the fact that the liquid impacts the blades is reduced, and therefore the service life of the impeller is prolonged, and the maintenance cost can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water pumps, in particular to an impeller, a centrifugal pump and an electric appliance. BACKGROUND

[0002] At present, centrifugal pumps (for example, submersible pumps, impeller pumps, etc.) are one of the key components of electric appliances such as air coolers, humidifiers, ice machines, etc. Fluid flows through the centrifugal pump, and the fluid is pressurized by the pump to achieve the performance required by the whole machine. In electric appliances, the centrifugal pump is usually at the bottom end, and it is generally required that the centrifugal pump pumps the fluid to the highest end of the electric appliance, and such design requires the centrifugal pump to have high performance.

[0003] The centrifugal pump currently used also has the following disadvantages: the impeller is a common horizontal impeller, which produces more turbulent flow, causing the pump body to produce noise, poor user experience, and affecting the stability of the pump body operation, and the hydraulic efficiency is not high; and after the water inlet of the volute is perpendicular to the water inlet of the impeller, the water flow directly impacts the surface of the impeller, and the surface of the impeller is severely worn after long-term operation, affecting the service life of the centrifugal pump. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide an impeller, a centrifugal pump and an electric appliance aiming at the problem that the impeller produces more turbulent flow, causing the pump body to produce noise, poor user experience, and affecting the stability of the pump body operation, and the hydraulic efficiency is not high in the related art.

[0005] The present application provides an impeller, a centrifugal pump and an electric appliance.

[0006] A cover plate has a liquid inlet;

[0007] A supporting plate is arranged opposite to the cover plate;

[0008] A plurality of blades are located between the cover plate and the supporting plate, and the plurality of blades are distributed at intervals around the axis of the liquid inlet, and a fluid passage is formed between adjacent blades;

[0009] A flow guide portion is arranged on the side of the supporting plate facing the cover plate and corresponding to the liquid inlet, and the flow guide portion is configured to guide the fluid flowing from the liquid inlet into the fluid passage.

[0010] In one embodiment, the flow guide portion has a flow guide surface extending from the liquid inlet into the fluid passage.

[0011] In one embodiment, the flow guide portion includes a supporting table, and the flow guide surface is formed on the outer circumferential surface of the supporting table.

[0012] In one of the embodiments, the flow guide surface is a flow guide arc surface, and the flow guide arc surface comprises a starting end and an ending end.

[0013] Along the axial direction of the liquid inlet, the projection of the starting end is circular, and the inner diameter of the projection of the starting end is smaller than the inner diameter of the liquid inlet; the projection of the ending end is circular, and the inner diameter of the projection of the ending end is equal to or greater than the inner diameter of the liquid inlet.

[0014] In one of the embodiments, along the axial direction of the liquid inlet, the flow guide surface comprises a first curved surface and a second curved surface, and the first curved surface and the second curved surface are connected.

[0015] The inner diameter of the first curved surface gradually decreases from one end away from the second curved surface to one end towards the second curved surface.

[0016] The inner diameter of the second curved surface gradually increases from one end towards the first curved surface to one end away from the first curved surface.

[0017] In one of the embodiments, along the axial direction of the liquid inlet, the size of the first curved surface is smaller than the size of the second curved surface.

[0018] In one of the embodiments, the vane is arc-shaped.

[0019] The flow channel comprises an inlet end and an outlet end, the inlet end is arranged corresponding to the liquid inlet, and the outlet end is formed on the outer edge of the cover plate and / or the supporting plate; the inner diameter of the inlet end is smaller than the inner diameter of the outlet end.

[0020] In one of the embodiments, a connecting hole for mounting the rotating shaft is configured in the middle part of the supporting table.

[0021] In one of the embodiments, the cover plate and the supporting plate are circular plates, the outer diameter of the cover plate and / or the supporting plate is between 24 mm and 24.6 mm, and the distance between the cover plate and the supporting plate is between 6.2 mm and 6.7 mm.

[0022] The diameter of the connecting hole is between 2.18 mm and 2.38 mm; the inner diameter of the starting end is between 4.6 mm and 5 mm; the inner diameter of the liquid inlet is between 10.3 mm and 10.7 mm; and the inner diameter of the ending end is between 12.3 mm and 13 mm.

[0023] The embodiments of the present application also provide a centrifugal pump, which comprises an impeller, a motor, and a volute, the impeller is located in the volute, and the rotating shaft of the motor is connected with the impeller.

[0024] The embodiment of the present application further provides an electric appliance comprising the centrifugal pump.

[0025] The impeller, the centrifugal pump and the electric appliance have the advantages that the cover plate and the supporting plate form a disc-shaped impeller, the plurality of blades are dispersedly arranged around the axis of the liquid inlet between the cover plate and the supporting plate, so that the two adjacent blades combine the cover plate and the supporting plate to form the fluid channel, and the liquid flowing from the liquid inlet flows out from the outer edge of the impeller; and the flow guide part is arranged in the area between the fluid channel and the liquid inlet, and specifically, the flow guide part is arranged on the inner side of the supporting plate, so that the flow guide part can buffer the liquid flowing from the liquid inlet, and the flowing liquid can smoothly transition into the fluid channel, which can reduce the turbulence, reduce the noise, improve the stability of the liquid flow, absorb part of the vibration and impact generated after the liquid flows into the flow guide part, reduce the abrasion caused by the liquid impacting the blades, thereby prolonging the service life of the impeller and reducing the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The whole structure of the impeller provided in some embodiments of the present application is shown in the schematic diagram.

[0027] Figure 2 The perspective structure of the impeller provided in some embodiments of the present application is shown in the schematic diagram.

[0028] Figure 3 The front view structure of the impeller provided in some embodiments of the present application is shown in the schematic diagram.

[0029] Figure 4 The front view structure of the impeller provided in some embodiments of the present application is shown in the schematic diagram.

[0030] REFERENCE NUMERALS

[0031] 100, cover plate; 110, liquid inlet;

[0032] 200, supporting plate;

[0033] 300, blade; 310, fluid channel;

[0034] 400, flow guide part; 401, flow guide surface; 4011, starting end; 4012, end; 410, support table; 411, connecting hole. DETAILED DESCRIPTION

[0035] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application. It should be understood that the use of the terms "include", "comprise" or "contain" herein should not be understood as limiting the present application to the features or steps described herein, but rather the use of these terms is intended to cover the presence of the features or steps described herein as well as the presence of other features or steps not described herein.

[0036] In the description of the present application, it should be understood that, if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can include at least one of the features explicitly or implicitly. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0038] In the present application, unless otherwise explicitly specified and limited, if the terms "mount", "connect", "connect", "fix" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless specifically defined and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] It should be noted that if an element is referred to as being "fixed" or "set" to another element, it can be directly on the other element or there can be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0041] The centrifugal pump currently used also has the following disadvantages: the impeller is a common horizontal plane impeller, which produces more turbulent flow, resulting in noise in the pump body, poor user experience, and affects the stability of the pump body operation, and the hydraulic efficiency is not high. Moreover, after the water inlet of the volute is perpendicular to the water inlet of the impeller, the water flow directly impacts the surface of the impeller, and the surface of the impeller is severely worn after long-term operation, affecting the service life of the centrifugal pump.

[0042] Based on the above problems, the present application provides an impeller, a centrifugal pump and an electric appliance, which can make the liquid flow into the impeller more smoothly, reduce turbulent flow, not only reduce noise and improve user experience, but also improve the running stability of the centrifugal pump.

[0043] Referring to Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the overall structure of the impeller provided in some embodiments of the present application. Figure 2 is a schematic diagram of the perspective structure of the impeller provided in some embodiments of the present application. The impeller provided in an embodiment of the present application includes a cover plate 100, a supporting plate 200, a plurality of blades 300 and a flow guide portion 400.

[0044] The cover plate 100 has a liquid inlet 110; the supporting plate 200 is arranged opposite to the cover plate 100; a plurality of blades 300 are located between the cover plate 100 and the supporting plate 200, and the plurality of blades 300 are spaced apart around the axis of the fluid inlet 110, and the fluid channels 310 are formed between adjacent blades 300; the flow guide part 400 is arranged on the side of the supporting plate 200 facing the cover plate 100 and corresponds to the liquid inlet 110, and the flow guide part 400 is configured to guide the fluid flowing from the liquid inlet 110 into the fluid channel 310.

[0045] It can be understood that the impeller provided in the example has a disc structure as a whole, and the fluid enters between the cover plate 100 and the supporting plate 200 through the liquid inlet 110 formed on the cover plate 100, and then enters the fluid channel 310 formed between adjacent two blades 300, and with the rotation of the impeller, the fluid in the fluid channel 310 is guided by the adjacent two blades 300 and is output from the outlet of the fluid channel 310 under the action of centrifugal force to achieve the purpose of pressurization.

[0046] Among them, the plurality of blades 300 are dispersedly arranged around the axis of the liquid inlet 110, that is, the end of each blade 300 close to the liquid inlet 110 has a certain distance from the axis of the liquid inlet 110, and it can also be understood that the circular region enclosed by the plurality of fluid channels 310 coincides with the axis of the liquid inlet 110, and the inner diameter of the circular region is equal to or slightly smaller than the inner diameter of the liquid inlet 110. This arrangement can leave space for the arrangement of the flow guide part 400, and can avoid the direct impact and wear of the blades 300 by the fluid entering from the liquid inlet 110.

[0047] The flow guide part 400 is arranged on the inner side of the supporting plate 200 and corresponds to the position of the liquid inlet 110, so that the liquid flowing from the liquid inlet 110 first contacts the flow guide part 400, thereby smoothly transitioning the liquid at the liquid inlet 110 into the fluid channel 310, reducing the problem of the fluid directly entering and impacting the blades 300, reducing the wear of the blades 300, thereby improving the service life of the entire impeller. In addition, the arrangement of the flow guide part 400 can also reduce turbulence, thereby reducing liquid flow noise and improving the stability of liquid flow.

[0048] In the example, the flow guide part 400 can be a protrusion connected to the supporting plate 200, which extends from the supporting plate 200 to the liquid inlet 110 and gradually reduces in inner diameter; the side wall surface of the protrusion can be a bevel or an arc surface to guide the liquid. The protrusion can be fastened to the supporting plate 200 by bonding, welding or bolt connection, and of course, it can also be formed integrally with the supporting plate 200, thereby enhancing the stability of the protrusion.

[0049] In the present application, a disc-shaped impeller is formed by the cover plate 100 and the supporting plate 200, a plurality of blades 300 are dispersedly arranged around the axis of the liquid inlet 110 between the cover plate 100 and the supporting plate 200, so that two adjacent blades 300 combine with the cover plate 100 and the supporting plate 200 to form a fluid channel 310, so that the liquid entering from the liquid inlet 110 flows out from the outer edge of the impeller; and a flow guide part 400 is arranged in the area between the fluid channel 310 and the liquid inlet 110, specifically, the flow guide part 400 can be arranged on the inner side of the supporting plate 200, the flow guide part 400 can buffer the liquid flowing from the liquid inlet 110, so that the flowing liquid can smoothly transition into the fluid channel 310, on the one hand, it can reduce turbulence, reduce noise, and improve the stability of liquid flow, on the other hand, the flow guide part 400 can absorb part of the vibration and impact generated after the fluid enters, reduce the wear caused by the liquid impacting the blade 300, thereby improving the service life of the impeller, and reducing maintenance costs.

[0050] In the following, the present application will be described in detail with reference to the accompanying drawings. Figure 1 -Appendix Figure 4 The specific structure of the impeller provided by the embodiments of the present application will be introduced. Figure 3 It is a front view structural schematic diagram of the impeller provided in some embodiments of the present application. Figure 4 It is a front view perspective structural schematic diagram of the impeller provided in some embodiments of the present application.

[0051] As Figure 1 shown, in some embodiments, the flow guide part 400 has a flow guide surface 401, and the flow guide surface 401 extends from the liquid inlet 110 to the fluid channel 310.

[0052] Specifically, the flow guide part 400 can be a boss arranged on the supporting plate 200, the shape of the boss is not limited, but at least one side surface of the boss forms a flow guide surface 401, and the liquid can enter the fluid channel 310 from the liquid inlet 110 along the flow guide surface 401, in order to further improve the uniformity of the liquid flowing in the impeller, the flow guide surface 401 is usually arranged on the periphery of the boss, and the boss is arranged corresponding to the center of the liquid inlet 110, so that the fluid can flow into the fluid channel 310 uniformly along the periphery of the boss. Thus, the energy loss caused by the liquid directly impacting the blade 300 and the supporting plate 200 from the liquid inlet 110 can be reduced, and the resistance of the liquid flow can be reduced, thereby improving the performance of the entire pump body.

[0053] As Figure 1 shown, in some embodiments, the flow guide part 400 includes a support table 410, and the flow guide surface 401 is formed on the outer peripheral surface of the support table 410.

[0054] It is understood that the support platform 410 formed on the tray 200 can be a platform for mounting a rotating shaft. In one example, the support platform 410 has a connecting hole 411 in the middle for mounting the rotating shaft. Specifically, the connecting hole 411 can be designed as a D-shaped shaft hole for mounting the rotating shaft of the motor in the centrifugal pump described below. The specific connection method between the support platform 410 and the rotating shaft can be understood by referring to relevant technologies, and will not be elaborated here.

[0055] The support platform 410 can be configured as a frustum shape. The end of the frustum-shaped support platform 410 away from the liquid inlet 110 can be connected to the inlet end of the fluid channel 310 or extend into the fluid channel 310, but there are no specific restrictions.

[0056] like Figure 2 and Figure 4 As shown, in some embodiments, the guide surface 401 is a guide arc surface, which includes a starting end 4011 and a ending end 4012. Along the axial direction of the inlet 110, the projection of the starting end 4011 is circular, and the inner diameter of the projection of the starting end 4011 is smaller than the inner diameter of the inlet 110. The projection of the ending end 4012 is circular, and the inner diameter of the projection of the ending end 4012 is equal to or greater than the inner diameter of the inlet 110.

[0057] Specifically, to further reduce the resistance to liquid flow, the cross-section of the guide arc surface along the axial direction of the inlet 110 in this example can be V-shaped. The inner diameter of the starting end 4011 should be as small as possible to avoid obstructing the inflowing liquid and forming eddies. The inner diameter of the ending end 4012 can be the same as the inner diameter of the inlet 110 to reduce the impact of the liquid directly on the impeller or support plate 200 from the inlet 110, thus reducing the formation of turbulence. Of course, the inner diameter of the ending end 4012 can also be larger than the inner diameter of the inlet 110, including the case where the ending end 4012 extends into the fluid channel 310. This setting, which guides the liquid to the fluid channel 310 through the guide arc surface, achieves the purpose of smoothly transitioning the liquid from the inlet 110 to the fluid channel 310, making the liquid flow smoother, further reducing turbulence, thereby improving the operating stability of the pump body and reducing noise.

[0058] In some embodiments, along the axial direction of the inlet 110, the guide surface 401 includes a first curved surface and a second curved surface, which are connected; the inner diameter of the first curved surface gradually decreases from one end away from the second curved surface to one end facing the second curved surface; the inner diameter of the second curved surface gradually increases from one end facing the first curved surface to one end away from the first curved surface.

[0059] Specifically, for the purpose of clearly describing the shape of the flow guide surface 401, the flow guide surface 401 is defined as a first curved surface and a second curved surface, while in actual application, the flow guide surface 401 is a smooth curved surface, which can realize smooth transition of the liquid. In the present example, the flow guide surface 401 can be understood as the outer surface of the cooling tower, that is, the cross section of the flow guide surface 401 is in the shape of a hyperbolic curve. In one example, along the axial direction of the liquid inlet 110, the size of the first curved surface is smaller than that of the second curved surface. It can be understood that the flow guide surface 401 has a concave portion towards the inside of the support platform 410, and the concave portion is close to the upper end of the support platform 410 (close to one end of the liquid inlet 110). This kind of arrangement can buffer the inertia when the liquid enters, and can further reduce the occurrence of turbulent flow, so that the liquid can enter the fluid passage 310 from the flow guide surface 401 more smoothly, thereby reducing energy loss and improving the flow and performance of the pump body.

[0060] As shown in Figure 4 , in some embodiments, the vane 300 is arc-shaped; the flow channel includes a liquid inlet 110 end and an outlet end, the liquid inlet 110 end is arranged corresponding to the liquid inlet 110, and the outlet end is formed at the outer edge of the cover plate 100 and / or the support plate 200; the inner diameter of the liquid inlet 110 end is smaller than that of the outlet end.

[0061] Specifically, the two ports of the fluid passage 310 are the liquid inlet 110 end and the outlet end, respectively. The liquid inlet 110 end is fastened to the liquid inlet 110, so that the fluid flows into the fluid passage 310 through the liquid inlet 110 end, while the outlet end is away from the liquid inlet 110 and arranged at the outer edge of the impeller, so that the accelerated fluid is output. For the inner diameter, that is, the cross-sectional area, of the liquid inlet 110 end and the outlet end of the fluid passage 310, the cross-sectional area of the liquid inlet 110 end is designed to be smaller than that of the outlet end, which can pressurize the fluid in the liquid inlet 110 end with small inner diameter, so that the fluid passage 310 is formed as an acceleration channel, which not only can pressurize and accelerate the fluid entering the fluid passage 310, but also can effectively reduce the vortex of the fluid in the fluid passage 310, and further enhance the pressurization effect of the fluid.

[0062] The plurality of vanes 300 provided in the present example are dispersedly arranged around the axis of the liquid inlet 110, and the end portion of the vane 300 close to the liquid inlet 110 is away from the axis of the liquid inlet 110 by a certain distance, that is, the inner diameter of the circular area enclosed by the liquid inlet 110 end of the plurality of fluid passages 310 can be equal to the inner diameter of the liquid inlet 110, of course, it can also be slightly smaller than the inner diameter of the liquid inlet 110, as shown in Figure 3 , this kind of arrangement can make the liquid flowing from the liquid inlet 110 enter the fluid passage 310 in time, and be pressurized and output from the outlet end of the fluid passage 310 under the guidance of the vane 300.

[0063] In addition, the blade 300 is arc-shaped, and the end portion of the blade 300 close to the liquid inlet 110 has a smaller size than the end portion of the blade 300 at the outer edge of the impeller, which can be the width of the blade 300 in the orthographic projection view along the axial direction of the liquid inlet 110, in other words, the width of the blade 300 gradually increases from the center of the impeller to the edge. Such a design is conducive to limiting the width of the fluid passage 310, thereby providing a basis for forming an acceleration passage for the fluid passage 310.

[0064] In addition, the end portion of the blade 300 close to the liquid inlet 110 can be chamfered to reduce the contact area of the fluid entering from the liquid inlet 110 with the end portion of the blade 300, so as to facilitate the fluid to enter the fluid passage 310 quickly and smoothly, which not only helps to reduce noise, but also improves the stability of the fluid flow in the impeller.

[0065] It should be noted that the number of blades 300 can be designed according to the actual width of the blade 300 and the size of other parts of the impeller, for example, six blades can be designed, but no specific limitation is made.

[0066] In some embodiments, the cover plate 100 and the supporting plate 200 are circular plates, the outer diameter of the cover plate 100 and / or the supporting plate 200 is between 24 mm and 24.6 mm, the distance between the cover plate 100 and the supporting plate 200 is between 6.2 mm and 6.7 mm, the diameter of the connecting hole 411 is between 2.18 mm and 2.38 mm, the inner diameter of the starting end 4011 is between 4.6 mm and 5 mm, the inner diameter of the liquid inlet 110 is between 10.3 mm and 10.7 mm, and the inner diameter of the end 4012 is between 12.3 mm and 13 mm.

[0067] For the purpose of clear understanding of the structure of the above-mentioned impeller and the preferred matching ratio of the parts of the impeller, for example, the outer diameter of the cover plate 100 and the supporting plate 200 is 24.3 mm, the distance between the cover plate 100 and the supporting plate 200 is 6.4 mm, the diameter of the connecting hole 411 is 2.28 mm, the inner diameter of the starting end 4011 is 4.8 mm, the inner diameter of the liquid inlet 110 is 10.5 mm, and the inner diameter of the end 4012 is 12.6 mm. At the same time, the above-mentioned flow guide surface 401 is designed in the form of the outer circumferential surface of the cooling tower, the minimum curvature of the flow guide surface 401 is designed to be -0.446, and the maximum curvature is designed to be 0.279. The impeller provided in the example can make the flow of the liquid in the impeller more smooth, reduce turbulence, and improve the operation stability of the pump body and reduce noise. In addition, the setting of the above-mentioned flow guide surface 401 can also absorb part of the vibration and impact, reduce the wear of the blade 300, thereby improving the service life of the impeller.

[0068] The embodiment of the present application further comprises a centrifugal pump, which comprises an impeller, a motor and a volute.

[0069] It can be understood that the centrifugal pump in the present example is provided with the impeller in the above embodiment on the rotating shaft of the motor, specifically, the rotating shaft is inserted into the connecting hole 411 of the support table 410. The volute is provided with an inlet passage and an outlet passage, the inlet passage is connected with the liquid inlet 110 of the impeller, and the outlet passage is connected with the outlet end of the fluid channel 310. More specifically, the outlet end of the fluid channel 310 is connected with the inner cavity of the volute, and the outlet passage is connected with the inner cavity of the volute.

[0070] The embodiment of the present application further comprises an electric appliance, which comprises the centrifugal pump in the above embodiment.

[0071] It can be understood that the electric appliance can be a cold fan, a humidifier, an ice maker or other household appliances requiring the use of a centrifugal pump, which is not limited herein. By using the improved impeller in the centrifugal pump, the setting of the flow guide part 400 in the impeller can reduce the resistance of fluid flow, make the flow of fluid in the impeller more uniform, and also absorb part of the vibration and impact when the fluid enters, thereby reducing the wear of the impeller and the volute, and prolonging the service life of the impeller.

[0072] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0073] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An impeller, characterized by, The impeller comprises: a cover plate having an inlet; a supporting plate arranged opposite to the cover plate; a plurality of blades arranged between the cover plate and the supporting plate, and spaced around the axis of the inlet, and a fluid passage being formed between adjacent blades; a flow guide arranged on the side of the supporting plate facing the cover plate and corresponding to the inlet, and configured to guide the fluid flowing from the inlet into the fluid passage.

2. The impeller of claim 1, wherein The flow guide has a flow guide surface extending from the inlet to the fluid passage.

3. The impeller of claim 2, wherein The flow guide comprises a support platform, and the flow guide surface is formed on the outer circumferential surface of the support platform.

4. The impeller of claim 3, wherein The flow guide surface is a flow guide curved surface, and the flow guide curved surface comprises a starting end and an ending end; In the axial direction of the inlet, the projection of the starting end is circular, and the inner diameter of the projection of the starting end is smaller than the inner diameter of the inlet, and the projection of the ending end is circular, and the inner diameter of the projection of the ending end is equal to or greater than the inner diameter of the inlet.

5. The impeller of claim 4, wherein In the axial direction of the inlet, the flow guide surface comprises a first curved surface and a second curved surface, and the first curved surface and the second curved surface are connected; The first curved surface gradually narrows in inner diameter from one end away from the second curved surface to one end towards the second curved surface; The second curved surface gradually expands in inner diameter from one end towards the first curved surface to one end away from the first curved surface.

6. The impeller of claim 5, wherein In the axial direction of the inlet, the size of the first curved surface is smaller than the size of the second curved surface.

7. The impeller of any one of claims 1-6, wherein, The blades are arc-shaped; The fluid passage comprises an inlet end and an outlet end, the inlet end is arranged corresponding to the inlet, and the outlet end is formed on the outer edge of the cover plate and / or the supporting plate; the inner diameter of the inlet end is smaller than the inner diameter of the outlet end.

8. The impeller of any one of claims 4-6, wherein, A connecting hole for mounting a rotating shaft is configured in the middle of the support platform.

9. The impeller of claim 8, wherein The cover plate and the supporting plate are circular plates, the outer diameter of the cover plate and / or the supporting plate is between 24 mm and 24.6 mm, and the distance between the cover plate and the supporting plate is between 6.2 mm and 6.7 mm; The diameter of the connecting hole is between 2.18 mm and 2.38 mm; the inner diameter of the starting end is between 4.6 mm and 5 mm; the inner diameter of the inlet is between 10.3 mm and 10.7 mm; and the inner diameter of the ending end is between 12.3 mm and 13 mm.

10. A centrifugal pump characterized by The centrifugal pump comprises a volute, a motor, and the impeller of any one of claims 1-9, the impeller being arranged in the volute, and the rotating shaft of the motor being connected to the impeller.

11. An electrical appliance characterised in that, The electric appliance comprises the centrifugal pump of claim 10.

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