Volute, water pump and electric appliance

Abstract

The utility model relates to a volute, a water pump and an electric appliance, the volute comprises a volute body, the volute body is provided with a cavity, and the side wall of the volute body is provided with a water outlet communicating with the cavity; the fluid acceleration structure is arranged in the cavity and connected with the inner wall face of the volute body. Wherein the fluid acceleration structure comprises a starting end and a tail end, the starting end is located on one side of the water outlet, the fluid acceleration structure extends in an arc shape along the inner wall face of the volute body from the starting end to the tail end, and the curvature is gradually reduced. The fluid acceleration structure is arranged in the volute body, the curvature of the cambered surface, deviating from the inner wall surface of the volute body, of the fluid acceleration structure is gradually reduced, and the arrangement is matched with the impeller mounted in the cavity, so that a fluid acceleration area is formed between the impeller and the fluid acceleration structure; therefore, the fluid flowing into the volute can be accelerated from zero pressure to higher pressure in a short time, and the water pumping performance and the user experience are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water pumps, in particular to a volute, a water 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 generally includes a motor and a pump head. The working principle is usually that the motor converts electrical energy into mechanical energy to provide power for the rotation of the water pump impeller, and the pump head converts mechanical energy into fluid kinetic energy to realize the function of water pump pressurization and water pumping. The pump head is usually composed of a centrifugal impeller and a pump head volute to change the flow direction of the fluid entering the water pump and increase the flow rate and pressure of the fluid under the action of the motor.

[0004] However, the centrifugal pump provided in the related art, especially the volute, can increase the flow rate and pressure of the fluid in cooperation with the impeller, but the performance is limited, and the fluid flow in the volute is unstable, which affects the performance of the whole machine and the user experience. Invention content

[0005] Therefore, it is necessary to provide a volute, a water pump and an electric appliance to solve the problems of poor performance and unstable fluid flow of the water pump in the related art.

[0006] The present application provides a volute, which comprises:

[0007] A volute body having a cavity, a side wall of the volute body having a water outlet communicating with the cavity;

[0008] A fluid acceleration structure arranged in the cavity, the fluid acceleration structure being connected with an inner wall surface of the volute body;

[0009] The fluid acceleration structure comprises a starting end and an end, the starting end is located on one side of the water outlet, and the fluid acceleration structure extends along the inner wall surface of the volute body in an arc shape from the starting end to the end, and the curvature gradually decreases.

[0010] In one embodiment, the fluid acceleration structure comprises an arc-shaped block, the arc-shaped block comprises a first arc surface and a second arc surface, the first arc surface faces the inner wall surface of the volute body and is fixedly connected with the volute body; and the second arc surface is arranged opposite to the first arc surface.

[0011] In one of the embodiments, the second arc surface comprises the start end and the end end, and the distance from the center of the volute body gradually increases from the start end to the end end.

[0012] In one of the embodiments, the rotation angle of the arc-shaped block around the center of the volute body is between 290° and 350°.

[0013] In one of the embodiments, the volute further comprises a water blocking structure, and the water blocking structure is arranged at the start end of the fluid accelerating structure, and the distance from the center of the volute body is smaller than the distance from the fluid accelerating structure to the center of the volute body.

[0014] In one of the embodiments, the water blocking structure is integrally formed with the fluid accelerating structure.

[0015] The water blocking structure has a water-facing surface, one end of the water-facing surface extends to the water outlet, and is arranged with a chamfered inner wall surface of the volute body.

[0016] In one of the embodiments, one end of the water-facing surface away from the volute body extends in a direction away from the fluid accelerating structure.

[0017] One end of the water-facing surface away from the volute body is arranged with a chamfered fluid accelerating structure.

[0018] In one of the embodiments, the center line of the water outlet and the line from the water outlet to the center of the volute body have a preset included angle.

[0019] In one of the embodiments, the volute further comprises a water outlet pipe arranged at the water outlet of the volute body, and the water outlet pipe extends along the tangent direction of the volute body at the water outlet.

[0020] The embodiments of the present application further provide a water pump comprising the volute of the above-mentioned embodiments, and

[0021] An impeller arranged in the cavity, and the impeller and the fluid accelerating structure have a gap therebetween.

[0022] A driving part located outside the volute and connected with the impeller to drive the impeller to rotate.

[0023] In one of the embodiments, a fluid channel is formed between the fluid accelerating structure and the impeller, and the inner diameter of the fluid channel gradually increases from the start end to the end end.

[0024] In one of the embodiments, the distance between the impeller and the water blocking structure is between 0.9 mm and 1.1 mm.

[0025] The embodiment of the present application also provides an electric appliance comprising the water pump.

[0026] The volute, the water pump and the electric appliance have the following advantages: the fluid accelerating structure is arranged in the volute body and connected with the inner wall surface of the volute body, the starting end of the fluid accelerating structure is arranged at the water outlet side, the tail end extends along the inner wall surface of the volute body in an arc shape, and the curvature of the arc surface of the fluid accelerating structure away from the inner wall surface of the volute body gradually decreases. The arrangement is beneficial to forming a fluid accelerating area between the impeller and the fluid accelerating structure, so that the fluid flowing into the volute can be accelerated from zero pressure to a higher pressure in a short time, and the water pumping performance and user experience are improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A perspective structural schematic view of the volute according to some embodiments of the present application is provided.

[0028] Figure 2 A front structural schematic view of the volute according to some embodiments of the present application is provided.

[0029] Figure 3 A disassembled structural schematic view of the water pump according to some embodiments of the present application is provided.

[0030] LIST OF ELEMENTS

[0031] 100, volute body; 110, cavity; 120, water outlet; 130, water outlet pipe;

[0032] 200, fluid accelerating structure; 201, starting end; 202, tail end; 210, arc block; 211, second arc surface;

[0033] 300, water blocking structure;

[0034] 400, impeller;

[0035] 500, driving part. DETAILED DESCRIPTION

[0036] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the 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 variety of ways beyond the specific embodiments described herein, and skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0037] In the description of the application, it should be understood that, if there are 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, 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 application and simplifying the description, and do not 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 application.

[0038] In addition, if there are these terms "first", "second", 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 technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. 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 of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0040] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be 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 "above", "above" and "above" of 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 "below", "below" and "below" of 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.

[0041] It is to be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein only mean for the purpose of illustration and are not meant to be limiting.

[0042] The centrifugal pump generally includes a motor and a pump head, and the working principle is generally that the motor converts electrical energy into mechanical energy to provide power for the rotation of the water pump impeller, and the pump head converts the mechanical energy into fluid kinetic energy to realize the function of the water pump for pressurizing and pumping water. The pump head is usually composed of a centrifugal impeller and a pump head volute to change the flow direction of the fluid entering the water pump and increase the flow rate and pressure of the fluid under the action of the motor.

[0043] However, the centrifugal pump provided in the related art, especially the volute, can increase the flow rate and pressure of the fluid in cooperation with the impeller, but the performance is limited, and the fluid flow in the volute is unstable, affecting the overall performance and user experience.

[0044] Based on the above problems, the embodiments of the present application provide a volute, a water pump and an electrical appliance, which can effectively improve the water pumping performance and improve the fluid flow stability.

[0045] Referring to Figure 1 and Figure 2 , Figure 1 is a perspective structural schematic view of a volute provided according to some embodiments of the present application. Figure 2 is a front structural schematic view of a volute provided according to some embodiments of the present application. An embodiment of the present application first provides a volute, which can include a volute body 100 and a fluid accelerating structure 200.

[0046] The volute body 100 has a cavity 110, and the side wall of the volute body 100 has a water outlet 120 in communication with the cavity 110; the fluid accelerating structure 200 is arranged in the cavity 110, and the fluid accelerating structure 200 is connected with the inner wall surface of the volute body 100; wherein the fluid accelerating structure 200 includes a starting end 201 and an end tail 202, the starting end 201 is located on one side of the water outlet 120, from the starting end 201 to the end tail 202, the fluid accelerating structure 200 extends along the inner wall surface of the volute body 100 in an arc shape, and the curvature gradually decreases.

[0047] It can be understood that the cavity 110 in the vortex shell body 100 can be understood as a cylindrical space, and the vortex shell body 100 has an upper cover, a lower cover and an arc-shaped side wall. The upper cover is provided with a water inlet in the middle, and the water outlet 120 is provided on the arc-shaped side wall of the vortex shell body 100. The lower cover is used to fix the impeller 400 and the motor for driving the water flow.

[0048] The impeller 400 is usually arranged at the center of the lower cover, that is, the distance between the impeller 400 and the inner wall surface of the vortex shell body 100 is equal. The fluid accelerating structure 200 provided in the present example is arranged in the cavity 110, specifically between the impeller 400 and the inner wall surface of the vortex shell body 100, so as to change the size of the area between the impeller 400 and the vortex shell body 100, thereby providing an accelerating flow field for the fluid, so that the fluid flowing into the vortex shell can be accelerated from zero pressure to a higher pressure in a short time.

[0049] Specifically, the fluid accelerating structure 200 is connected with the inner wall surface of the vortex shell body 100. In order to increase the connection firmness between the two, welding, gluing, bolt connection and the like can be used for fastening connection. Of course, the fluid accelerating structure 200 can be formed integrally with the vortex shell body 100, which not only ensures the stability of the two, but also is easier to process.

[0050] In order to clearly describe the setting form of the fluid accelerating structure 200 in the vortex shell body 100, the two ends of the fluid accelerating structure 200 are defined as a starting end 201 and an end tail 202 respectively. The starting end 201 is located on one side of the water outlet 120, and the end tail 202 extends along the arc-shaped inner wall surface of the vortex shell body 100, that is, the fluid accelerating structure 200 is an arc-shaped structure, and the curvature of the arc-shaped structure gradually decreases along with the extension of the end tail 202. In other words, the curvature of the part of the fluid accelerating structure 200 close to the starting end 201 is the largest, and the bending degree of this part is obvious, while the curvature of the part of the fluid accelerating structure 200 close to the end tail 202 is the smallest, and the bending degree of this part is not obvious. In addition, the curvature of this part tends to the curvature of the inner wall surface of the vortex shell body 100.

[0051] According to the above description, it can be seen that in order to realize the change of different curvatures of the fluid accelerating structure 200, the distance from the center of the vortex shell body 100 can be controlled. That is, from the starting end 201 to the end tail 202, the distance of the fluid accelerating structure 200 from the center of the vortex shell body 100 gradually increases. This kind of setting will make the gap between the impeller 400 and the starting end 201 of the fluid accelerating structure 200 smaller, and the distance between the impeller 400 and the end tail 202 of the fluid accelerating structure 200 larger, thereby forming an accelerating flow field between the two, so that the fluid entering the vortex shell can be accelerated from zero pressure to a higher pressure in a short time, so as to flow out of the water outlet 120 quickly, thereby effectively improving the performance of the water pump.

[0052] In addition, since the fluid accelerating structure 200 is connected with the inner wall surface of the volute body 100, in order to realize the change of the curvature, it means that the thickness of the fluid accelerating structure 200 in the radial direction of the volute body 100 is different, that is, the thickness of the fluid accelerating structure 200 at the starting end 201 is the largest, and the thickness of the fluid accelerating structure 200 at the end end 202 is the smallest, close to zero.

[0053] In the present application, by arranging the fluid accelerating structure 200 in the volute body 100 and connecting the fluid accelerating structure 200 with the inner wall surface of the volute body 100, the starting end 201 of the fluid accelerating structure 200 is arranged at one side of the water outlet 120, and the end end 202 extends along the arc surface of the inner wall surface of the volute body 100, and the curvature of the arc surface of the fluid accelerating structure 200 away from the inner wall surface of the volute body 100 gradually decreases. The above arrangement cooperates with the impeller 400 arranged in the cavity 110, which is beneficial to form a fluid accelerating area between the impeller 400 and the fluid accelerating structure 200, so that the fluid flowing into the volute can be accelerated from zero pressure to a higher pressure in a short time, thereby improving the water pumping performance and user experience.

[0054] In the following, the specific structure of the volute provided by the embodiments of the present application will be introduced. Figure 1 -Appendix Figure 2 The specific structure of the volute provided by the embodiments of the present application will be introduced.

[0055] As shown in FIG. 1, in some embodiments, the fluid accelerating structure 200 includes an arc block 210, and the arc block 210 includes a first arc surface and a second arc surface 211. Figure 1 The first arc surface is arranged towards the inner wall surface of the volute body 100 and is fixedly connected with the volute body 100, and the second arc surface 211 is arranged away from the first arc surface.

[0056] Specifically, the starting end 201 of the arc block 210 is located at one side of the water outlet 120, and since the curvature at this position is large, the thickness of the arc block 210 in the radial direction of the volute body 100 at this position is the largest, that is, the end surface of the starting end 201 has a water blocking function. The first arc surface of the arc block 210 is arranged in close contact with the inner wall surface of the volute body 100, that is, the curvature of the first arc surface is consistent with the curvature of the volute body 100, which is beneficial to firmly connect (adhere, weld, bolt connect, etc.) the arc block 210 with the volute body 100, and of course, is also beneficial to integrally form the arc block 210 with the volute body 100, thereby increasing the structural strength.

[0057] In the above embodiment, the curvature of the fluid acceleration structure 200 gradually decreases from the starting end 201 to the ending end 202. This refers to the curvature of the second arc surface 211, which corresponds to the impeller 400 and forms an acceleration flow domain. The spirally arranged second arc surface 211 can change the distance between itself and the impeller 400, thereby adjusting the cross-sectional size of the acceleration flow domain. For example, when fluid enters the starting end 201 of the fluid acceleration structure 200, the small space there will accelerate the fluid from zero pressure to a higher pressure in a short time. The fluid continues to flow along the acceleration flow domain until it enters the outlet 120. Due to the presence of the end face of the starting end 201 at the outlet 120, the fluid can flow into the outlet 120 as much as possible, reducing the phenomenon of fluid circulation inside the vortex body 100, thereby making the fluid flow more stable.

[0058] like Figure 2 As shown, in some embodiments, the second arc surface 211 includes a starting end 201 and a ending end 202, and the distance of the second arc surface 211 from the starting end 201 to the ending end 202 gradually increases from the center of the vortex shell body 100.

[0059] Specifically, the change in curvature of the second arc surface 211 can be represented by its distance from the center of the volute body 100. That is, the distance from the starting end 201 of the second arc surface 211 to the center of the volute body 100 is the smallest, while the distance from the ending end 202 of the second arc surface 211 to the center of the volute body 100 is the largest. This, in conjunction with the impeller 400, forms an acceleration flow zone with a different inner diameter within the volute body 100, thereby effectively improving the pumping performance.

[0060] In some embodiments, the rotation angle of the arc-shaped block 210 around the center of the vortex body 100 is between 290° and 350°.

[0061] Specifically, the rotation angle of the arc-shaped block 210 corresponds to the ratio of the arc-shaped block 210 to the circumference of the inner wall of the volute body 100. That is, the ratio of the extension length of the arc-shaped block 210 to the circumference of the inner wall of the volute body 100 is greater than or equal to 0.8, so as to ensure that the fluid flowing into the volute body 100 can effectively increase the flow velocity and pressure, thereby improving the pumping performance. Specifically, the rotation angle of the arc-shaped block 210 around the center of the volute body 100 is between 290°. Of course, due to the presence of the outlet 120, the end 202 of the arc-shaped block 210 can be set on the other side of the outlet 120 to avoid obstructing the outlet 120 and affecting the water output efficiency.

[0062] like Figure 1 As shown, in some embodiments, the vortex shell also includes a water-blocking structure 300, which is disposed at the starting end 201 of the fluid acceleration structure 200. The distance between the water-blocking structure 300 and the center of the vortex shell body 100 is less than the distance between the fluid acceleration structure 200 and the center of the vortex shell body 100.

[0063] Specifically, a water blocking structure 300 is arranged at the starting end 201 of the fluid accelerating structure 200, which can effectively optimize the flow field inside the volute body 100, i.e., as much as possible, the pressurized fluid is discharged from the water outlet 120, and the water blocking structure 300 blocks part of the fluid, which can reduce the circulation of the fluid inside the volute body 100, thereby making the flow of the fluid in the volute body 100 more stable, and further improving the performance of the water pump.

[0064] It should be noted that the water blocking structure 300 described above can be a water blocking plate, which can be fixed on the starting end 201 of the fluid accelerating structure 200 by means of gluing, welding, bolt connection, etc. In order to achieve the purpose of water blocking, the distance between the water blocking plate and the center of the volute body is less than the distance between the starting end 201 and the center of the volute body, i.e., the distance between the end of the water blocking plate and the impeller 400 is as small as possible.

[0065] In some embodiments, the water blocking structure 300 is integrally formed with the fluid accelerating structure 200; the water blocking structure 300 has a water-facing surface, one end of the water-facing surface extends to the water outlet 120, and is chamfered with the inner wall surface of the volute body 100.

[0066] Specifically, the water blocking structure 300 can be integrally formed with the fluid accelerating structure 200, which can increase the strength of the water blocking structure 300, thereby improving the stability during water blocking. Of course, the water blocking structure 300, the fluid accelerating structure 200 and the volute body 100 can be integrally machined, thereby ensuring the integrity of the volute, which is beneficial to improve the service life of the volute and the processing convenience.

[0067] The water-facing surface can extend along the radial direction of the volute body 100, of course, it can also be inclined to the side away from or close to the fluid accelerating structure 200, which is not limited herein. One end of the water-facing surface connected with the volute body 100 can also extend to the water outlet 120, so that the fluid blocked by the water blocking structure 300 can quickly flow into the water outlet 120. In addition, the water blocking structure 300 is chamfered with the inner wall surface of the volute body 100, which can guide the fluid on one hand, and on the other hand, can effectively reduce the turbulent flow, thereby improving the stability of the fluid flow.

[0068] In some embodiments, one end of the water-facing surface away from the volute body 100 extends away from the fluid accelerating structure 200; one end of the water-facing surface away from the volute body 100 is chamfered with the fluid accelerating structure 200.

[0069] Specifically, the water blocking structure 300 is chamfered, which can guide the fluid entering the volute body 100 to flow, thereby avoiding the fluid flowing along the radial direction of the side wall of the volute body 100, effectively reducing the turbulence, and providing stability of the water flow.

[0070] The inclination direction and degree of the water-facing surface can be designed according to the arrangement of the water outlet 120. In some embodiments, the center line of the water outlet 120 and the line connecting the water outlet 120 to the center of the volute body 100 have a preset included angle.

[0071] Specifically, by adjusting the relationship between the center line of the water outlet 120 and the radial direction of the volute body 100, the water outlet 120 can correspond to the flow direction of the fluid as much as possible. When the fluid in the volute body 100 passes through the fluid accelerating structure 200 and enters the water outlet 120, the fluid can smoothly enter the water outlet 120 without changing direction or changing a small direction. This design can effectively reduce the turbulence of the fluid at the water blocking structure 300, improve the performance and stability of the water pump, and stabilize the fluid flow in the volute.

[0072] The water outlet 120 can be provided on the side wall of the corresponding volute body 100 along the tangential direction of the volute body 100. Of course, it can also be slightly deflected according to the actual application.

[0073] The water-facing surface can be parallel to the center line of the water outlet 120. Of course, the included angle between the water-facing surface and the center line of the water outlet 120 can also be reasonably arranged according to the flow of the fluid, which is not limited herein.

[0074] In some embodiments, the volute further comprises a water outlet pipe 130, which is arranged at the water outlet 120 of the volute body 100, and the water outlet pipe 130 extends along the tangential direction of the volute body 100 at the water outlet 120.

[0075] Specifically, the above-mentioned water outlet 120 can be a tangential water outlet 120 provided along the tangential direction of the volute body 100, the water outlet pipe 130 is adaptively installed at the water outlet 120, and the extension direction of the water outlet pipe 130 is consistent with the tangential direction of the volute body 100. When the fluid passes through the fluid accelerating structure 200 and is about to enter the water outlet 120, the fluid does not need to change direction, but can directly flow out along the wall surface of the tangential water outlet 120, thereby effectively reducing the turbulence of the fluid at the water blocking structure 300, greatly improving the performance and stability of the water pump, and stabilizing the fluid flow.

[0076] The embodiment of the present application also provides a water pump, which refers to Figure 3 , and Figure 3A disassembled structural schematic diagram of a water pump according to some embodiments of the present application is provided. The water pump can include the volute, the impeller 400 and the driving part 500 in the above embodiments. The impeller 400 is arranged in the cavity 110, and a gap is formed between the impeller 400 and the fluid accelerating structure 200; the driving part 500 is located outside the volute and is connected with the impeller 400 to drive the impeller 400 to rotate.

[0077] It can be understood that, from the starting end 201 to the end end 202, the gap between the impeller 400 and the fluid accelerating structure 200 increases from small to large. By arranging the fluid accelerating structure 200, the path of the fluid flowing into the volute body 100 from the water inlet and flowing out of the volute body 100 from the water outlet 120 is re-divided, and an accelerated flow field is formed between the impeller 400 and the fluid accelerating structure 200, so that the fluid entering the volute can be accelerated from zero pressure to a higher pressure in a short time, so as to quickly flow out of the water outlet 120, thereby effectively improving the performance of the water pump.

[0078] In some embodiments, a fluid channel is formed between the fluid accelerating structure 200 and the impeller 400, and the inner diameter of the fluid channel increases from the starting end 201 to the end end 202.

[0079] Specifically, the fluid channel is the accelerated flow field in the above example, and the inner diameter of the fluid channel specifically refers to the distance between the fluid accelerating structure 200 and the impeller 400 in the radial direction, which can also be understood as the cross-sectional area of the fluid channel. Since the cross-sectional area of the fluid channel at the starting end 201 is small, the rotation of the impeller 400 driven by the driving part 500 is realized, so as to realize the pressurization and acceleration of the fluid at this position, thereby greatly improving the performance and efficiency of the water pump.

[0080] In some embodiments, the distance between the impeller 400 and the water retaining structure 300 is between 0.9 mm and 1.1 mm.

[0081] Specifically, the distance between the impeller 400 and the water retaining structure 300 needs to ensure the width of the water retaining structure 300 in the radial direction to improve the water retaining effect, and also needs to ensure the normal rotation of the impeller 400, so the distance can be comprehensively considered according to the actual situation. For example, the distance between the impeller 400 and the water retaining structure 300 is 0.9 mm, 1 mm or 1.1 mm.

[0082] Taking the inner diameter of the volute body 100 as 28.2 mm as an example, the effective width of the water blocking structure 300 in the radial direction can be 1.1 mm, 1.2 mm, 1.3 mm, so as to ensure that most of the fluid can change the flow direction through the water blocking structure 300 into the water outlet 120; the maximum curvature of the fluid accelerating structure 200 is 0.108, and the rotation angle of the fluid accelerating structure 200 from the starting end 201 to the end 202 can be 290°, 300°, 310°, etc., so as to ensure that the fluid flowing into the volute body 100 can effectively increase the flow rate and the pressure, thereby improving the performance of the water pump.

[0083] In addition, the water blocking structure 300 is chamfered by 0.2 mm with the inner wall surface of the volute body 100, and the water blocking structure 300 is chamfered by 0.4 mm with the fluid accelerating structure 200, and the chamfered setting can make the turning of the fluid more smooth, which can effectively reduce the turbulent flow, thereby improving the stability of the water pump during operation.

[0084] The embodiment also provides an electric appliance including the water pump in the above embodiment. The electric appliance in the example can be a cold fan, a humidifier, an ice maker, or the like, which is a household electric appliance requiring the use of a water pump, without limitation. By arranging the fluid accelerating structure 200 in the above volute, an accelerated flow rate can be provided for the fluid, so that the fluid flowing into the volute can be accelerated from zero pressure to a higher pressure in a short time, thereby effectively improving the performance of the water pump and further improving the use experience of the entire electric appliance.

[0085] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description.

[0086] The above embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent application scope. 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. A volute, characterized in that, The volute comprises: a volute body having a cavity, a side wall of the volute body having a water outlet communicating with the cavity; a fluid accelerating structure arranged in the cavity, the fluid accelerating structure being connected with an inner wall surface of the volute body; wherein the fluid accelerating structure comprises a starting end and an end, the starting end being located at one side of the water outlet, from the starting end to the end, the fluid accelerating structure extends along the inner wall surface of the volute body in an arc shape, and the curvature gradually decreases.

2. The volute of claim 1, wherein, The fluid accelerating structure comprises an arc-shaped block, the arc-shaped block comprises a first arc surface and a second arc surface, the first arc surface faces the inner wall surface of the volute body and is fixedly connected with the volute body; the second arc surface is arranged opposite to the first arc surface.

3. The volute of claim 2, wherein, The second arc surface comprises the starting end and the end, from the starting end to the end, the distance from the second arc surface to the center of the volute body gradually increases.

4. The volute of claim 2, wherein, The rotation angle of the arc-shaped block around the center of the volute body is between 290°-350°.

5. The volute according to any one of claims 1-4, wherein, The volute further comprises a water blocking structure, the water blocking structure is arranged at the starting end of the fluid accelerating structure, the distance from the water blocking structure to the center of the volute body is less than the distance from the fluid accelerating structure to the center of the volute body.

6. The volute of claim 5, wherein, The water blocking structure is integrally formed with the fluid accelerating structure; The water blocking structure has a water-facing surface, one end of the water-facing surface extends to the water outlet, and the inner wall surface of the volute body is chamfered.

7. The volute of claim 6, wherein, The end of the water-facing surface away from the volute body extends in a direction away from the fluid accelerating structure; The end of the water-facing surface away from the volute body is chamfered with the fluid accelerating structure.

8. The volute according to any one of claims 1-4, wherein, The center line of the water outlet and the line from the water outlet to the center of the volute body have a preset included angle.

9. The volute of claim 8, wherein, The volute further comprises a water outlet pipe, the water outlet pipe is arranged at the water outlet of the volute body, and the water outlet pipe extends along the tangent direction of the volute body at the water outlet.

10. A water pump characterized by comprising: The volute comprises the volute according to any one of claims 1-9, and an impeller arranged in the cavity, the impeller having a gap with the fluid accelerating structure; a driving part located outside the volute and connected with the impeller to drive the impeller to rotate.

11. The water pump of claim 10, wherein A fluid channel is formed between the fluid accelerating structure and the impeller, from the starting end to the end, the inner diameter of the fluid channel gradually increases.

12. The water pump of claim 10, wherein, The distance between the impeller and the water blocking structure is between 0.9mm-1.1mm.

13. An electrical appliance characterized by The water pump comprises the water pump according to any one of claims 10-12.

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