Drainage pump and dishwasher
By setting up a boss in the pump chamber of the drain pump and coaxially arranging the impeller to form a high-pressure zone and a low-pressure zone, the problem of insufficient drainage pressure of the existing drain pump is solved, and efficient and stable drainage effect is achieved.
Patent Information
- Application Number
- CN202421673511.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-15
AI Technical Summary
The insufficient drainage pressure of existing drainage pumps leads to low drainage efficiency and long drainage time. Increasing the drainage pump volume or increasing the impeller speed will lead to high energy consumption or large space consumption.
By providing a boss in the pump chamber of the drain pump and arranging the impeller and the pump chamber coaxially, the minimum spacing between the boss and the impeller is smaller than the spacing between the peripheral wall of the pump chamber and the impeller, a high-pressure zone and a low-pressure zone are formed to improve drainage pressure and efficiency.
While improving the working stability of the drain pump and reducing vibration, it greatly increases the drainage pressure, improves drainage efficiency, and reduces drainage time.
Smart Images
Figure CN222910348U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pump bodies, and more specifically, to a drainage pump and a dishwasher. Background Art
[0002] In the related art, the drainage pressure of the drainage pump is insufficient, resulting in low drainage efficiency and long drainage time. In some related arts, increasing the volume of the drainage pump or raising the rotational speed of the impeller to improve the drainage efficiency will lead to a large occupied space or high energy consumption of the drainage pump. Summary of the Utility Model
[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. To this end, an object of the utility model is to provide a drainage pump, which effectively improves the drainage efficiency and shortens the drainage time.
[0004] The utility model also provides a dishwasher with the above drainage pump.
[0005] The drainage pump according to the embodiment of the utility model includes: a pump housing and an impeller. The pump housing includes a housing main body and a boss. The housing main body has a pump cavity. The impeller is rotatably arranged in the pump cavity and is coaxially arranged with the pump cavity. A drainage port is provided on the inner peripheral wall of the pump cavity. The boss is arranged in the pump cavity and is connected to the inner peripheral wall of the pump cavity, so that the minimum distance between the boss and the impeller is less than the distance between the inner peripheral wall of the pump cavity and the impeller, and the boss is located behind the drainage port in the rotation direction of the impeller.
[0006] The drainage pump according to the embodiment of the utility model, by arranging the impeller coaxially with the pump cavity and providing a boss behind the drainage port in the pump cavity, can greatly increase the drainage pressure, improve the drainage efficiency and reduce the drainage time while improving the working stability of the drainage pump and reducing vibration.
[0007] In addition, the drainage pump according to the above embodiment of the utility model may further have the following additional technical features:
[0008] According to some embodiments of the utility model, in the circumferential direction of the pump cavity, a high-pressure area is formed on the side of the boss close to the drainage port, and a low-pressure area is formed on the side of the boss far from the drainage port. The fluid pressure in the high-pressure area is greater than the fluid pressure in the low-pressure area.
[0009] According to some embodiments of the utility model, the minimum distance between the boss and the impeller is 5 mm to 6 mm; and / or, the distance between the inner peripheral wall of the pump cavity and the impeller is 7 mm to 8 mm.
[0010] According to some embodiments of the present utility model, the minimum distance between the boss and the impeller is L1, and the distance between the inner peripheral wall of the pump chamber and the impeller is L2, and L1 / L2 is greater than or equal to 0.7 and less than or equal to 0.8.
[0011] According to some embodiments of the present utility model, in the circumferential direction of the pump chamber, the surface of the boss is smoothly and transitionally connected to the inner peripheral wall of the pump chamber.
[0012] According to some embodiments of the present utility model, along the rotation direction of the impeller, the distance between the boss and the impeller gradually increases.
[0013] According to some embodiments of the present utility model, in the circumferential direction of the pump chamber, the boss is connected to the edge of the drain port.
[0014] According to some embodiments of the present utility model, a drain joint is provided on the outer peripheral wall of the housing body, the drain joint has a joint channel communicating with the drain port, and the surface of the boss is smoothly and transitionally connected to the channel wall of the joint channel.
[0015] According to some embodiments of the present utility model, in the circumferential direction of the pump chamber, the included angles between the two ends of the boss and the connection lines with the center of the pump chamber are less than or equal to 90°.
[0016] The dishwasher according to the embodiment of the present utility model includes a drain pump according to the embodiment of the present utility model.
[0017] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:
[0019] Figure 1 is an exploded view of a partial structure of a dishwasher according to an embodiment of the present utility model;
[0020] Figure 2 is a schematic diagram of a partial structure of a dishwasher according to an embodiment of the present utility model;
[0021] Figure 3 is Figure 2 an enlarged schematic diagram of the circled area A in
[0022] Figure 4 is a partial cross-sectional view of a dishwasher according to an embodiment of the present utility model;
[0023] Figure 5 isFigure 4 Schematic enlarged structure diagram showing part B in the circle.
[0024] Reference numerals:
[0025] Drain pump 100; Dishwasher 200; Water cup 210; Drain pipe 220;
[0026] Pump housing 10; Housing main body 11; Pump chamber 111; Drain port 112; High-pressure area 113; Low-pressure area 114; Boss 12; First side 121; Second side 122; Drain joint 13; Joint passage 131;
[0027] Impeller 20; Rotation area 201 of impeller 20; Pump body 30. Detailed implementation manners
[0028] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.
[0029] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.
[0030] In the description of the present utility model, the "first feature" and the "second feature" may include one or more of such features. The meaning of "a plurality" is two or more. The first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature therebetween. The first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature.
[0031] The following describes a drainage pump 100 according to an embodiment of the present invention and a device including the drainage pump 100 according to an embodiment of the present invention with reference to the accompanying drawings. The drainage pump 100 can be used to pump fluids such as water and oil to achieve fluid discharge. The drainage pump 100 can be used in devices such as a dishwasher 200. For example, in some embodiments, as Figures 1 - 3 shown, the dishwasher 200 according to an embodiment of the present invention includes the drainage pump 100 according to an embodiment of the present invention, and the drainage of the sewage after washing the dishes in the dishwasher 200 can be achieved through the drainage pump 100.
[0032] Referring to Figures 1 - 5 shown, the drainage pump 100 according to an embodiment of the present invention may include: a pump housing 10 and an impeller 20.
[0033] Specifically, the pump housing 10 includes a housing main body 11 and a boss 12. The housing main body 11 has a pump chamber 111. The impeller 20 is rotatably disposed in the pump chamber 111 and the impeller 20 is coaxially arranged with the pump chamber 111. A drainage port 112 is provided on the inner peripheral wall of the pump chamber 111. The boss 12 is disposed in the pump chamber 111 and the boss 12 is connected to the inner peripheral wall of the pump chamber 111 so that the minimum distance between the boss 12 and the impeller 20 is less than the distance between the inner peripheral wall of the pump chamber 111 and the impeller 20. And the boss 12 is located behind the drainage port 112 in the rotation direction of the impeller 20.
[0034] The boss 12 can be integrally formed with the housing main body 11 or can be connected to the housing main body 11 by means of fasteners, snap connection, etc. The coaxial arrangement of the impeller 20 and the pump chamber 111 means that the rotation axis of the impeller 20 coincides with the central axis of the pump chamber 111. Thereby, the vibration of the drainage pump 100 during the rotation of the impeller 20 can be reduced and the stability of the drainage pump 100 can be improved.
[0035] The drainage port 112 is used to discharge the fluid in the pump chamber 111 to the outside of the pump chamber 111 to achieve the fluid pumping function of the drainage pump 100. That the boss 12 is located behind the drainage port 112 in the rotation direction of the impeller 20 means that for any point on the outer periphery of the impeller 20, starting from the position opposite to the drainage port 112 and rotating along the rotation direction, the position opposite to the boss 12 can be passed when the rotation angle is less than 180°. For example Figures 2 - 5 shown, the impeller 20 rotates in the clockwise direction shown by the dotted arrow. The boss 12 is located on the clockwise side of the drainage port 112. And in the circumferential direction of the pump chamber 111, the included angle formed by the positions of the boss 12 and the drainage port 112 with respect to the rotation axis of the impeller 20 is less than 180°. In some specific embodiments, the included angle formed by the positions of the boss 12 and the drainage port 112 with respect to the rotation axis of the impeller 20 is less than 90°.
[0036] The boss 12 is connected to the inner peripheral wall of the pump chamber 111, and the boss 12 protrudes inward from the inner peripheral wall of the pump chamber 111, so that the arrangement of the boss 12 can reduce the distance between the outer periphery of the impeller 20, that is, the distance between the boss 12 and the impeller 20 can be smaller than the distance between the inner peripheral wall of the pump chamber 111 and the impeller 20.
[0037] Thus, the boss 12 can narrow the flow passage on the radially outer side of the impeller 20, making the pressure in the entire pump chamber 111 uneven. The boss 12 can reduce the flow rate flowing to the area on the circumferential side of the boss 12 away from the drain port 112, so that the fluid can be discharged through the drain port 112 as much as possible to improve the drainage pressure and drainage efficiency. For example, in the circumferential direction of the pump chamber 111, a low-pressure area 114 is formed on the side of the boss 12 away from the drain port 112 in the circumferential direction, and a high-pressure area 113 is formed on the side of the boss 12 close to the drain port 112. The fluid pressure in the high-pressure area 113 is greater than the fluid pressure in the low-pressure area 114. Thus, the high-pressure area 113 can increase the pressure of the fluid flowing out through the drain port 112, that is, greatly improve the drainage pressure, thereby improving the drainage efficiency; the formation of the low-pressure area 114 makes the water at the water inlet easier to enter the pump chamber 111, further improving the fluid pumping speed.
[0038] For example, in some embodiments where the drainage pump 100 is used in the dishwasher 200, as Figure 1 shown, the pump housing 10 can be connected to the water cup 210 of the dishwasher 200. The water in the water cup 210 can enter the pump chamber 111 through the water inlet and then be discharged through the drain port 112. By arranging the boss 12, the fluid pressure near the drain port 112 can be increased to improve the drainage pressure, and the fluid pressure near the water inlet can be reduced to improve the water inlet speed, thereby improving the overall drainage efficiency.
[0039] It should be noted that in the embodiment where the pump housing 10 is connected to the water cup 210, the pump housing 10 and the water cup 210 can be integrally formed or can be separate parts connected together.
[0040] According to the drainage pump 100 of the embodiment of the present invention, by arranging the impeller 20 and the pump chamber 111 coaxially and arranging the boss 12 at the rear side of the drain port 112 in the pump chamber 111, it is possible to greatly increase the drainage pressure, improve the drainage efficiency, and reduce the drainage time while improving the working stability of the drainage pump 100 and reducing vibration.
[0041] Since the drainage pump 100 according to the embodiment of the present invention has the above-mentioned beneficial technical effects, the dishwasher 200 according to the embodiment of the present invention, by arranging the impeller 20 and the pump chamber 111 coaxially and arranging the boss 12 at the rear side of the drain port 112 in the pump chamber 111, can greatly increase the drainage pressure, improve the drainage efficiency, and reduce the drainage time while improving the working stability of the drainage pump 100 and reducing vibration.
[0042] In some embodiments, as Figure 3 shown, the minimum distance L1 between the boss 12 and the impeller 20 is 5 mm to 6 mm. For example, L1 can be 5 mm, 5.2 mm, 5.5 mm, 5.7 mm, 5 mm, etc.
[0043] It should be noted that the impeller 20 includes a plurality of blades. Here, the minimum distance between the boss 12 and the impeller 20 refers to the distance between the outer peripheral surface of the rotation region 201 formed by the blades of the impeller 20 and the boss 12. As Figure 3 shown, the rotation region 201 of the impeller 20 is the outer peripheral surface of the cylinder formed with the rotation axis of the impeller 20 as the center line and the distance between the radially outer end of the blade and the axis of the rotating shaft as the radius.
[0044] If the minimum distance between the boss 12 and the impeller 20 is too small, some solid impurities in the fluid are likely to get stuck between the boss 12 and the impeller 20, affecting the normal rotation of the impeller 20. For example, food residues in the water discharged by the dishwasher 200 are likely to jam the impeller 20 at this place. If the minimum distance between the boss 12 and the impeller 20 is too large, it will affect the pressure value of the high-pressure area 113 near the drain port 112.
[0045] Within the above value range, the minimum distance between the boss 12 and the impeller 20 is more reasonable, enabling the impeller 20 to rotate smoothly, effectively increasing the pressure value of the high-pressure area 113, and greatly improving the drainage pressure and drainage efficiency.
[0046] In some embodiments, as Figure 3 shown, the distance L2 between the inner peripheral wall of the pump chamber 111 and the impeller 20 is 7 mm to 8 mm. For example, L2 can be 7 mm, 7.2 mm, 7.5 mm, 7.7 mm, 8 mm, etc. Here, the distance between the inner peripheral wall of the pump chamber 111 and the impeller 20 actually refers to the distance between the inner peripheral wall of the pump chamber 111 and the outer peripheral surface of the rotation region 201 of the impeller 20.
[0047] If the distance between the inner peripheral wall of the pump chamber 111 and the impeller 20 is too small, some solid impurities in the fluid are likely to get stuck between the inner peripheral wall of the pump chamber 111 and the impeller 20, and are more likely to get stuck between the boss 12 and the impeller 20, affecting the normal rotation of the impeller 20; if the distance between the inner peripheral wall of the pump chamber 111 and the impeller 20 is too large, the driving force of the impeller 20 on the fluid in the region of the inner diameter of the pump chamber 111 away from the impeller 20 upwards will be weakened; in addition, whether the distance between the inner peripheral wall of the pump chamber 111 and the impeller 20 is too large or too small, it is likely to cause the ratio of L1 to L2 to be out of balance, which is not conducive to the formation of the high-pressure area 113 and the low-pressure area 114.
[0048] Within the above-mentioned value range, the distance between the inner peripheral wall of the pump chamber 111 and the impeller 20 is more reasonable, enabling the impeller 20 to rotate smoothly, ensuring the overall driving force of the impeller 20 on the fluid, facilitating the formation of the high-pressure area 113 and the low-pressure area 114, and achieving a better effect of improving the drainage efficiency.
[0049] In some embodiments, the minimum distance between the boss 12 and the impeller 20 is L1, and the distance between the inner peripheral wall of the pump chamber 111 and the impeller 20 is L2, where L1 / L2 is greater than or equal to 0.7 and less than or equal to 0.8. For example, L1 / L2 can be 5 mm, 5.2 mm, 5.5 mm, 5.7 mm, 5 mm, etc.
[0050] L1 and L2 satisfy the above proportional range, making the values of L1 and L2 more reasonable and coordinated, resulting in a more obvious effect of forming the high-pressure area 113 and the low-pressure area 114 on both sides of the boss 12, higher drainage efficiency, and it is not easy for solid impurities to get stuck between the boss 12 and the impeller 20, causing the impeller 20 to jam, and the drainage pump 100 operates more smoothly.
[0051] According to some embodiments of the present invention, as Figure 3 and Figure 5 shown, in the circumferential direction of the pump chamber 111, the surface of the boss 12 is smoothly connected to the inner peripheral wall of the pump chamber 111.
[0052] The surface of the boss 12 is smoothly connected to the inner peripheral wall of the pump chamber 111. Here, the surface of the boss 12 can be the entire surface of the boss 12 or a partial surface of the boss 12 directly connected to the inner peripheral wall of the pump chamber 111. For example Figure 5 as shown in, in the rotation direction of the impeller 20, the surface of the boss 12 includes a first side surface 121 on the side facing away from the drain port 112 and a second side surface 122 on the side facing the drain port 112. Among them, the first side surface 121 is smoothly connected to the inner peripheral wall of the pump chamber 111. The smooth connection means that there are no obvious sharp corners, edges, grooves and other structures at the connection between the first side surface 121 and the inner peripheral wall of the pump chamber 111, but are connected into a plane or an arc surface.
[0053] By smoothly connecting the surface of the boss 12 to the inner peripheral wall of the pump chamber 111, as Figure 5 shown at the circled C in, the resistance of the fluid flowing backward from the boss 12 can be reduced, thereby reducing the inlet pressure of the pump chamber 111, reducing the formation of eddy currents at this place, further reducing the flow loss, and improving the drainage efficiency.
[0054] In some embodiments, as Figure 5As shown, along the rotation direction of the impeller 20, the distance between the boss 12 and the impeller 20 gradually increases. For example, the first side surface 121 of the boss 12 is formed as an inclined plane, and the plane is transitionally connected to the inner peripheral wall of the pump chamber 111 through an arc surface; for another example, the first side surface 121 of the boss 12 is integrally formed as an arc surface, and the arc surface is transitionally connected to the inner peripheral wall of the pump chamber 111. The flow resistance of the fluid when flowing through the surface of the boss 12 is smaller, and the effect of improving the drainage efficiency is better.
[0055] According to some embodiments of the present invention, as Figure 4 and Figure 5 shown, in the circumferential direction of the pump chamber 111, the boss 12 is connected to the edge of the drain port 112. Thus, the high-pressure area 113 formed on the side of the boss 12 close to the drain port 112 can be located radially inside the drain port 112, that is, opposite to the drain port 112. The fluid in the high-pressure area 113 can be discharged more quickly through the drain port 112, and the pressurizing effect at the drain port 112 is better. Moreover, in the circumferential direction of the pump chamber 111, it is not easy to form an eddy current area between the boss 12 and the drain port 112, avoiding the loss of flow velocity.
[0056] According to some embodiments of the present invention, as Figure 1 、 Figure 4 and Figure 5 shown, a drain joint 13 is provided on the outer peripheral wall of the housing body 11. The drain joint 13 has a joint channel 131 communicating with the drain port 112, and the surface of the boss 12 is smoothly transitionally connected to the channel wall of the joint channel 131.
[0057] The drain joint 13 can be used to connect to a pipeline outside the drain pump 100. For example, Figure 1 shown in connection with the drain pipe 220 of the dishwasher 200, so that the fluid drained from the drain port 112 can be discharged through the drain pipe 220.
[0058] The drain channel communicates with the drain port 112, or it can be said that the inlet of the drain channel is formed as the drain port 112.
[0059] The surface of the boss 12 is smoothly transitionally connected to the channel wall of the joint channel 131. Here, the surface of the boss 12 can be the entire surface of the boss 12, or it can be the partial surface of the boss 12 directly connected to the channel wall. For example, Figure 5 shown in, in the rotation direction of the impeller 20, the surface of the boss 12 includes a first side surface 121 on the side facing away from the drain port 112 and a second side surface 122 on the side facing the drain port 112. Among them, the second side surface 122 is smoothly transitionally connected to the channel wall of the joint channel 131. The smooth transitional connection means that there are no obvious sharp corners, edges, grooves and other structures at the connection between the second side surface 122 and the channel wall, but are connected in a plane or an arc surface.
[0060] The surface of the boss 12 is smoothly connected to the channel wall of the joint channel 131. Figure 5 As shown in the middle circle D, on the one hand, the resistance of the fluid flow out of the drainage port 112 can be reduced, and on the other hand, the formation of eddy currents near the boss 12 and the joint channel 131 can be reduced, which is beneficial to improving the drainage efficiency.
[0061] In some embodiments, Figure 5 As shown in the middle circle E, the inner peripheral wall of the pump chamber 111 is smoothly connected to the channel wall of the joint channel 131. Thus, the drainage resistance can be reduced at the edge of the drainage port 112 away from the boss 12, thereby improving the drainage efficiency.
[0062] According to some embodiments of the present invention, Figure 3 and Figure 5 As shown, in the circumferential direction of the pump chamber 111, the angle between the two ends of the boss 12 and the line connecting the center of the pump chamber 111 is less than or equal to 90°. That is, in the circumferential direction of the pump chamber 111, the span of the boss 12 is less than or equal to 90°.
[0063] If the span of the boss 12 is too large, it will occupy a large space in the pump chamber 111, affecting the stability of the pump housing 10 and the impeller 20. Within the above range, the boss 12 can achieve a good effect of increasing the drainage pressure, while taking into account the stability of the pump housing 10 and the impeller 20, thereby improving the working stability of the drainage pump 100.
[0064] A dishwasher 200 according to a specific embodiment of the present invention is described in detail below with reference to the accompanying drawings. It should be understood that the following description is only an exemplary illustration and cannot be construed as a limitation to the present invention.
[0065] like Figures 1 - 5 As shown, a dishwasher 200 according to a specific embodiment of the present invention includes a water cup 210, a drain pump and a drain pipe 220, and the drain pump adopts a drain pump 100 according to a specific embodiment of the present invention. The drain pump 100 includes a shell body 11, a boss 12, a drain joint 13, an impeller 20 and a pump body 30. The shell body 11 is connected to the water cup 210, and the shell body 11 defines a pump chamber 111 connected to the water cup 210. The outer contour of the cross section of the pump chamber 111 perpendicular to the rotation axis of the impeller 20 is circular, and the rotation axis of the impeller 20 is colinear with the central axis of the pump chamber 111. The pump body 30 is located outside the shell body 11 and is transmission-connected to the impeller 20 to drive the impeller 20 to rotate in the pump chamber 111.
[0066] The inner peripheral wall of the pump chamber 111 is provided with a drain port 112. The drain joint 13 is arranged outside the housing main body 11 and has a joint passage 131 communicating with the drain port 112. The drain pipe 220 is connected to the drain joint 13. The boss 12 is inside the pump chamber 111 and is located at the rear side of the drain port 112. The first side surface 121 of the boss 12 is smoothly and transitionally connected to the inner peripheral wall of the pump chamber 111, and the first side surface 121 of the boss 12 is smoothly and transitionally connected to the passage wall of the joint passage 131. The minimum distance between the boss 12 and the rotation area 201 of the impeller 20 is 5.5 mm, and the distance between the inner peripheral wall of the pump chamber 111 and the rotation area 201 of the impeller 20 is 7.5 mm, that is, the narrowest part of the radial outer flow passage of the impeller 20 is 5.5 mm, the widest part is 7.5 mm, and the ratio of the two places is 73.3%, so the drainage efficiency is higher.
[0067] In the above embodiment, by setting the narrowing of the boss 12, the internal pressure of the pump chamber 111 is uneven. When the impeller 20 rotates, the fluid flows along the path shown by the solid line arrow in the figure. Figure 5 Due to the existence of the boss 12, the fluid flowing to the area on the side of the boss 12 facing away from the drain port 112 is greatly reduced, so that a high-pressure area 113 is formed in the area of the boss 12 close to the drain port 112, and a low-pressure area 114 is formed in the area of the boss 12 facing away from the drain port 112. The high-pressure area 113 is opposite to the drain port 112, thereby greatly increasing the drainage pressure and improving the drainage efficiency. The formation of the low-pressure area 114 makes the fluid in the water cup 210 easier to enter the pump chamber 111, thereby further increasing the drainage speed.
[0068] The other components and operations of the drainage pump 100 and the dishwasher 200 according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.
[0069] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0070] In the description of this specification, the descriptions referring to terms such as "embodiment", "specific embodiment", "example", etc. mean that the specific features, structures, materials or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.
[0071] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.
Claims
1. A drainage pump for a dishwasher, characterized in that: include: A pump casing and an impeller, wherein the pump casing comprises a casing body and a boss, the casing body having a pump chamber, the impeller being rotatably disposed in the pump chamber and being coaxially arranged with the pump chamber, the inner circumferential wall of the pump chamber being provided with a drain outlet, the boss being disposed in the pump chamber, the boss being connected to the inner circumferential wall of the pump chamber so that the minimum spacing between the boss and the impeller is smaller than the spacing between the inner circumferential wall of the pump chamber and the impeller, and the boss being located at the rear side of the drain outlet in the rotation direction of the impeller.
2. The drainage pump according to claim 1, characterized in that: In the circumferential direction of the pump chamber, a high-pressure area is formed on the side of the boss close to the drain port, and a low-pressure area is formed on the side of the boss away from the drain port, and the fluid pressure in the high-pressure area is greater than the fluid pressure in the low-pressure area.
3. The drainage pump according to claim 1, characterized in that: The minimum distance between the boss and the impeller is 5 mm to 6 mm; and / or the distance between the inner peripheral wall of the pump chamber and the impeller is 7 mm to 8 mm.
4. The drainage pump according to claim 1, characterized in that: The minimum distance between the boss and the impeller is L1, the distance between the inner circumferential wall of the pump chamber and the impeller is L2, and L1 / L2 is greater than or equal to 0.7 and less than or equal to 0.
8.
5. The drainage pump according to claim 1, characterized in that: In the circumferential direction of the pump cavity, the surface of the boss is smoothly connected to the inner circumferential wall of the pump cavity.
6. The drainage pump according to claim 5, characterized in that: Along the rotation direction of the impeller, the distance between the boss and the impeller gradually increases.
7. The drainage pump according to claim 1, characterized in that: The boss is connected to the edge of the drain port in the circumferential direction of the pump chamber.
8. The drainage pump according to claim 1, characterized in that: The outer peripheral wall of the shell body is provided with a drainage joint, and the drainage joint has a joint channel communicated with the drainage port, and the surface of the boss is smoothly transitionally connected with the channel wall of the joint channel.
9. The drainage pump according to any one of claims 1 to 8, characterized in that: In the circumferential direction of the pump cavity, the angles between the two ends of the boss and the lines connecting the center of the pump cavity are less than or equal to 90°.
10. A dishwasher, characterized in that: Comprising a drainage pump according to any one of claims 1-9.