Wall-mounted washing machine

Abstract

This is a wall-mounted washing machine apparatus. The wall-mounted washing machine apparatus (1) includes an outer tub (10) and a fan (20) fixed to the top (121) of the outer tub (10), and the volute (21) of the fan (20) includes an upper volute having a first horizontal top surface, a helical curved surface, and a second horizontal top surface that are in contact with each other in sequence, and a lower volute having a first horizontal bottom surface, in which the height of a portion of the blow-out passage that corresponds to the helical curved surface gradually increases along the extension direction of the helical curved surface. By providing a helical curved surface that rises in a spiral shape in the upper volute, the amount of blow-out air from the wall-mounted washing machine apparatus is increased.

Description

[Technical field]

[0001] The present invention relates to the field of laundry, and in particular to wall-mounted washing machine appliances. [Background technology]

[0002] With the improvement of people's living standards, customized home appliances are appearing one after another. Wall-mounted washing machines (such as wall-mounted drum washing machines) have the advantages of compact structure, small space, low noise, low manufacturing cost, etc., and are attracting more and more users' attention. For example, some wall-mounted washing machines can wash small underwear or baby clothes, etc., which can not only realize the washing of light clothes, but also prevent cross-infection caused by bacteria between clothes, and have good economic and practical properties.

[0003] A typical wall-mounted washing machine only has the functions of washing, rinsing, and spin-drying. In order to meet the diverse needs of users by providing multiple functions, a wall-mounted washing machine with a drying function has been developed in the prior art. For example, Patent Document 1 discloses a wall-mounted washing machine. The wall-mounted washing machine includes an outer tub and a drying device, and the drying device is at least partially integrally molded on the side wall of the outer tub. The drying device includes a first air duct and a second air duct, the first air duct communicates with the suction port of the outer tub to ventilate dry hot air into the inside of the outer tub, and the second air duct communicates with the outer tub outlet and the first air duct, respectively, to condense the moist hot air received from the outer tub into dry and cold air. The wall-mounted washing machine can dry clothes and improve drying efficiency by using circulating air. However, since the overall volume of the wall-mounted washing machine is small and the internal space is limited, the dimensions of the first air duct of the wall-mounted washing machine are small, the amount of air discharge is small, and the drying efficiency is not high. Therefore, there is room for improvement in the wall-mounted washing machine.

[0004] Accordingly, the field needs new technical solutions to solve the above problems. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] China Patent Publication No. 111809339 Summary of the Invention

[0006] In order to solve the technical problem of low blowing volume of a fan of a wall-mounted washing machine apparatus in the prior art, the present invention provides a wall-mounted washing machine apparatus, the wall-mounted washing machine apparatus includes an outer tub and a fan fixed to a top of the outer tub, the fan includes a volute and an impeller arranged within the volute, the volute includes an upper volute having a first horizontal top surface, a spiral curved surface and a second horizontal top surface which are in succession adjacent to each other, the first horizontal top surface and the second horizontal top surface are perpendicular to an axis of the impeller, the spiral curved surface is arranged to extend spirally upward from the first horizontal top surface to the second horizontal top surface, and a lower volute abutting the upper volute to define an outlet passage, the lower volute has a first horizontal bottom surface perpendicular to the axis, whereby the height of a portion of the outlet passage corresponding to the spiral curved surface gradually increases along the extension direction of the spiral curved surface.

[0007] As can be understood by those skilled in the art, the wall-mounted washing machine of the present invention includes an outer tub and a fan fixed to the top of the outer tub. The fan includes a volute and an impeller disposed within the volute. The volute has an upper volute and a lower volute. The upper volute has a first horizontal top surface, a spiral curved surface, and a second horizontal top surface that are in contact with each other in sequence. The first horizontal top surface and the second horizontal top surface are perpendicular to the axis of the impeller, and the spiral curved surface is disposed so as to extend from the first horizontal top surface in a spiral upward direction to the second horizontal top surface. The lower volute butts against the upper volute to define an outlet passage and transport dry air into the outer tub. The lower volute has a first horizontal bottom surface perpendicular to the impeller axis. The first horizontal bottom surface and the first horizontal top surface are parallel to each other, and therefore the height of the part of the outlet passage corresponding to the first horizontal top surface does not change. The helical surface extends from the first horizontal top surface to the second horizontal top surface, and therefore the height of the portion of the outlet passage corresponding to the helical surface gradually increases along the direction of the helical surface. As can be seen, compared to a simple horizontal surface design, the wall-mounted washing machine of the present invention arranges the upper volute as a first horizontal top surface, a helical surface, and a second horizontal top surface that are in contact with each other in sequence, so that the height of the portion of the outlet passage corresponding to the helical surface gradually increases. In addition, the second horizontal top surface is arranged higher than the first horizontal top surface, and the height of the portion of the outlet passage corresponding to the second horizontal top surface also increases accordingly, so that the overall space of the outlet passage is increased, the kinetic energy loss when the air passes through the outlet passage is reduced, and the fan blows more air. In addition, the height of the portion of the outlet passage corresponding to the helical surface gradually increases along the extending direction of the helical surface, so the cross section of the outlet passage in this portion also gradually increases, the flow speed of the air passing through this outlet passage gradually slows down, and some of the kinetic energy is transformed into static pressure energy, improving the transport efficiency of the outlet passage in this portion, and the overall outlet volume of the fan increases accordingly. Furthermore, due to the design of the helical surface, the outlet passage has a better flow guiding effect, the wind resistance is reduced, and the outlet volume of the fan is further increased.In addition, a certain amount of mounting space is generally reserved between the top of the volute and the housing of the wall-mounted washing machine appliance, and by arranging a spirally rising spiral surface on the upper volute and a second horizontal top surface that has a height difference from the first horizontal top surface, the reserved space can be fully utilized, making the structure of the wall-mounted washing machine appliance more compact and achieving a higher space utilization rate.

[0008] In a preferred technical solution of the wall-mounted washing machine, the fan further includes a volute tongue, the length of the shortest connecting line from the center of the impeller to the volute tongue is L1, the radius of the impeller is R, and L1=(1.05~1.2)×R. The design of the volute tongue can prevent a part of the air from circulating in the volute, and improve the blowing efficiency of the fan. Furthermore, the length L1 of the shortest connecting line from the center of the impeller to the volute tongue and the radius R of the impeller satisfy L1=(1.05~1.2)×R, so that the gap from the volute tongue to the outer diameter of the impeller is neither too large nor too small, and the decrease in fan efficiency due to the gap being too large can be prevented, and the generation of loud noise due to the gap being too small can also be prevented.

[0009] In a preferred technical solution of the wall-mounted washing machine, a part of the contour of the projection surface of the volute perpendicular to the axis is an involute curve, and the maximum wrap angle α of the involute curve is in the range of 250° to 300°. The air obtains kinetic energy by driving the fan, and is blown away by the centrifugal action of the fan. By making a part of the contour of the projection surface of the volute an involute curve, the cross section of the blowing passage gradually becomes larger, the flow speed of the air in the blowing passage gradually slows down, and a part of the kinetic energy is transformed into static pressure energy, thereby reducing energy loss. In addition, in order to obtain good fan performance and improve fan efficiency, the maximum wrap angle α of the involute curve is in the range of 250° to 300°.

[0010] In a preferred technical solution of the above wall-mounted washing machine, the involute curve has n reference lines, where the first reference line l1 is the shortest connecting line from the center of the impeller to the volute tongue, and has a shortest connecting line length L1, and the length of each of the reference lines is L n =(1.02~1.1)×L (n-1) and a predetermined angle β is formed between every two adjacent reference lines, the predetermined angle β being in the range of 20° to 30°, and n being an integer equal to or greater than 3. With the above-mentioned arrangement, the contour line of the volute is arranged as a smooth curve without inflection points, reducing wind resistance when air flows through the volute, and correspondingly improving the efficiency of the fan and increasing the amount of air blown out.

[0011] In a preferred technical solution of the wall-mounted washing machine, the height difference H between the second horizontal top surface and the first horizontal top surface in the axial direction satisfies H = (0.2 to 0.6) x R. With the above-mentioned arrangement, the height difference between the second horizontal top surface and the first horizontal top surface in the axial direction of the impeller becomes appropriate, which can satisfy the increase in the overall space of the blowing passage and prevent the height difference from being too large and occupying too much internal space of the wall-mounted washing machine.

[0012] In the preferred technical solution of the wall-mounted washing machine, the lower volute further includes an oblique curved surface and a second horizontal bottom surface, the second horizontal bottom surface is parallel to the second horizontal top surface, the second horizontal bottom surface is higher than the first horizontal bottom surface in the direction of the axis, the oblique curved surface is arranged to extend obliquely upward from the first horizontal bottom surface to the second horizontal bottom surface, and the oblique curved surface fits into the arc-shaped wall at the top of the outer tub. By providing an oblique curved surface on the lower volute and arranging the oblique curved surface to fit into the arc-shaped wall at the top of the outer tub, the volute can be better attached to the outer tub, thereby improving the utilization rate of the internal space of the wall-mounted washing machine. In addition, the design of the oblique curved surface gradually reduces the cross section of the blowing passage, and some static pressure energy is transformed into kinetic energy again, so that the flow speed of the air passing through the corresponding oblique curved surface blowing passage is faster, thereby improving the blowing efficiency.

[0013] In a preferred technical solution of the wall-mounted washing machine, the spiral surface extends in a clockwise or counterclockwise direction, and the second horizontal top surface and the second horizontal bottom surface extend toward the front end of the outer tub. The spiral surface may be arranged in a clockwise or counterclockwise direction, thereby enriching the product types and meeting different needs of users. In addition, the second horizontal top surface and the second horizontal bottom surface are arranged to extend toward the front end of the outer tub, so that the dry air in the outlet passage can be easily transported into the outer tub.

[0014] In a preferred technical solution of the wall-mounted washing machine, the impeller has a plurality of blades arranged at equal intervals around the axis, and the blade outlet angle of each of the blades has the same predetermined angle γ, and the range of the predetermined angle γ is 145° to 155°. By providing the impeller with a plurality of blades arranged at equal intervals around the axis, the rotation of the impeller is driven to drive the air flow between the blades. By setting the blade outlet angle of each blade to the same angle, the force reception of the blades can be made more uniform, and the air flow caused by the rotation of the impeller can be made more stable, thereby extending the service life of the impeller. Furthermore, the blade outlet angle is set to 145° to 155°, that is, if the impeller is a forward-facing impeller (the blade outlet angle is greater than 90°), a higher pressure head can be obtained, and a larger air flow rate can be obtained under the same conditions (i.e., the motor output power, the blade size, the number of blades, the blade interval, etc. are the same). In addition, the blade outlet angle is set to 145°~155°, so that the inclination angle of the forward-curved impeller blades is appropriate, and it is possible to avoid a situation where the inclination angle is too large, resulting in an excessively large pressure head, which would cause deformation of the blades, and to prevent a situation where the inclination angle is too small, resulting in an excessively small pressure head, which would affect the air flow rate.

[0015] In a preferred technical solution of the wall-mounted washing machine, a fan inlet is formed at the center of the first horizontal bottom surface, and fan exhaust ports are defined at the ends of the second horizontal top surface and the second horizontal bottom surface, and the wall-mounted washing machine further includes a supply air duct connected to the fan exhaust port and the suction port of the outer tub, respectively, and a return air duct having a bottom inlet and a top outlet, the bottom inlet overlapping the outer tub outlet and the top outlet being arranged to abut against the fan inlet. With the above arrangement, the wall-mounted washing machine can form a closed circulating air circuit, and can prevent the moist and hot air generated during the drying process from being directly discharged and affecting the surrounding environment.

[0016] In the preferred technical solution of the wall-mounted washing machine, a heating element is installed in the volute at a position adjacent to the fan exhaust port. By installing the heating element in the volute at a position adjacent to the fan exhaust port, the air is heated and turned into dry air when passing through the heating element, and the dry air is transported into the wall-mounted washing machine to carry away moisture in the clothes to be dried, thereby achieving the purpose of drying the clothes. [Brief description of the drawings]

[0017] [Figure 1] 1 is a schematic perspective view of a wall-mounted washing machine according to an embodiment of the present invention; [Diagram 2] 1 is a schematic perspective view of a partial structure of a wall-mounted washing machine according to an embodiment of the present invention; [Diagram 3] FIG. 3 is a schematic plan view of an embodiment of a partial structure of the wall-mounted washing machine appliance of the present invention shown in FIG. 2. [Figure 4] 1 is a schematic perspective view of a fan of a wall-mounted washing machine according to an embodiment of the present invention; [Diagram 5] FIG. 2 is a schematic three-dimensional view of an embodiment of a volute of a wall-mounted washing machine of the present invention; [Figure 6] FIG. 2 is a structural schematic diagram of an embodiment of the inside of a volute of a wall-mounted washing machine according to the present invention; [Figure 7]FIG. 7 is a partial enlarged view of part A of the embodiment of the inside of the volute of the wall-mounted washing machine of the present invention shown in FIG. 6. [Figure 8] 2 is a structural schematic diagram of a lower volute of a wall-mounted washing machine according to an embodiment of the present invention; FIG. [Figure 9] FIG. 2 is a schematic diagram of an embodiment of the contour line of a volute of a wall-mounted washing machine appliance of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Those skilled in the art will understand that these embodiments are only for illustrating the technical principles of the present invention, and do not limit the protection scope of the present invention.

[0019] In the description of the present invention, the directions or positional relationships indicated by the terms "up", "down", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, which are merely for ease of description, and do not indicate or imply that the devices or elements necessarily have a specific orientation, or are constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. Furthermore, the terms "first" and "second" are used for the purpose of description only, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, unless otherwise specified or limited, the terms "attaching," "installation," and "connection" should be understood in a broad sense, and may mean, for example, fixedly connected, detachably connected, or integrally connected, directly connected, indirectly connected via an intermediate medium, or even that the interiors of two elements communicate with each other. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0021] In order to solve the technical problem of low blowing volume of the fan of the wall-mounted washing machine in the prior art, the present invention provides a wall-mounted washing machine 1. The wall-mounted washing machine 1 includes an outer tub 10 and a fan 20 fixed to the top 121 of the outer tub 10, the fan 20 includes a volute 21 and an impeller 22 arranged in the volute 21, the volute 21 is an upper volute 211 having a first horizontal top surface 2111, a helical curved surface 2112 and a second horizontal top surface 2113 which are in contact with each other in sequence, the first horizontal top surface 2111 and the second horizontal top surface 2113 being perpendicular to the axis C of the impeller 22, and the helical curved surface 2113 is a first horizontal top surface 2111, a second horizontal top surface 2113 and a second horizontal top surface 2113 which are in contact with each other in sequence. 112 includes an upper volute 211 arranged to extend spirally upward from a first horizontal top surface 2111 to a second horizontal top surface 2113, and a lower volute 212 abutting against the upper volute 211 to define an outlet passage 213, the lower volute 212 having a first horizontal bottom surface 2121 perpendicular to the axis C, whereby the height of a portion of the outlet passage 213 corresponding to the spiral curved surface 2112 gradually increases along the extension direction of the spiral curved surface 2112. With the above-mentioned arrangement, the installation space reserved at the top of the wall-mounted washing machine 1 is fully utilized, so that the overall space of the outlet passage 213 of the wall-mounted washing machine 1 is increased, and the cross section of the outlet passage 213 corresponding to the spiral curved surface 2112 gradually increases along the extension direction of the spiral curved surface 2112, reducing wind resistance and thereby increasing the amount of air blown by the fan.

[0022] As used herein, unless there is a clear explanation to the contrary, the terms "wrap angle" means the angle of the connecting lines between any two points on the involute curve portion of the volute's outline and the base center, "maximum wrap angle" means the angle of the connecting lines between the start point and end point of the involute curve of the volute's outline and the base center, "fitting" means that two related elements or objects are identical in shape and are approximately parallel to each other at a specified distance, and "blade exit angle" means the angle between the tangent to the blade at the outer diameter of the impeller and the circumferential direction.

[0023] FIG. 1 is a schematic three-dimensional view of an embodiment of a wall-mounted washing machine apparatus of the present invention, FIG. 2 is a schematic three-dimensional view of an embodiment of a partial structure of a wall-mounted washing machine apparatus of the present invention, FIG. 3 is a schematic plan view of an embodiment of a partial structure of a wall-mounted washing machine apparatus of the present invention shown in FIG. 2, FIG. 4 is a schematic three-dimensional view of an embodiment of a fan of a wall-mounted washing machine apparatus of the present invention, FIG. 5 is a schematic three-dimensional view of an embodiment of a volute of a wall-mounted washing machine apparatus of the present invention, FIG. 6 is a structural schematic view of an embodiment of the interior of the volute of a wall-mounted washing machine apparatus of the present invention, FIG. 7 is a partially enlarged view of part A of the embodiment of the interior of the volute of a wall-mounted washing machine apparatus of the present invention shown in FIG. 6, FIG. 8 is a structural schematic view of an embodiment of the lower volute of a wall-mounted washing machine apparatus of the present invention, and FIG. 9 is a schematic view of an embodiment of the contour line of the volute of a wall-mounted washing machine apparatus of the present invention.

[0024] As shown in Fig. 1, in one or more embodiments, the wall-mounted washing machine 1 is a wall-mounted drum washing machine. Alternatively, the wall-mounted washing machine 1 may be a wall-mounted dryer or other suitable type of washing machine. The wall-mounted washing machine 1 includes components such as an outer tub 10, an inner tub (not shown), a fan 20, a supply air duct 30, and a return air duct 40, so that the wall-mounted washing machine 1 has functions such as, but not limited to, washing, rinsing, spin-drying, and drying.

[0025] As shown in FIG. 1, in one or more embodiments, the outer tub 10 includes a back plate 11, a tub body 12, an outer tub cover 13, and an observation window 15. Based on the orientation shown in FIG. 1, the tub body 12 has a front end 123 and an opposing rear end 124. The rear end 124 of the tub body 12 is fixed integrally to the front side of the back plate 11, the outer tub cover 13 covers the front end 123 of the tub body 12, and the observation window 15 is fixed to the outer tub cover 13. As shown in FIG. 1, the back plate 11 is substantially flat. Mounting holes (not shown) are provided at four diagonal corners of the back plate 11. The mounting holes can be engaged with a mounting member (not shown), so that the wall-mounted washing machine 1 can be fixed to a predetermined wall by the back plate 11. The tub body 12 is a substantially cylindrical cavity for defining a space of an inner tub that can accommodate laundry and other laundry. Preferably, the back plate 11 and the tank body 12 can be integrally molded by injection molding using PP, ABS, or other suitable resin materials. Alternatively, the back plate 11 and the tank body 12 can be manufactured separately and then fixed. The fixing method can be welding, screw fixing, bolt fixing, or other suitable fixing method. The outer tank cover 13 can be integrally molded by injection molding using PP, ABS, or other suitable resin materials. The outer tank cover 13 can be fixed to the tank body 12 by methods including, but not limited to, welding, screws, and bolts. As shown in FIG. 2, the outer tank cover 13 is formed with an annular wall 131 that extends outwardly and perpendicularly around the central axis of the tank body 12 to define a substantially circular opening 14. As shown in FIG. 3, in one or more embodiments, an outer tank suction port 1311 is formed at the top of the annular wall 131 to be connected to the air supply duct 30, thereby allowing dry hot air to be transported into the tank body 12 for drying clothes or other items. In one or more embodiments, the outer tub suction port 1311 is arranged to be approximately rectangular and chamfered. Alternatively, the outer tub suction port 1311 may be arranged to be other suitable shapes, such as trapezoidal, elliptical, etc. As shown in FIG. 2, in one or more embodiments, a window packing 132 is arranged on the inner side of the annular wall 131.The window packing 132 includes a substantially annular window packing body 1321 and a hollow connecting portion 1322 extending vertically outward from the window packing body 1321 along a radial direction. The connecting portion 1322 passes through the outer tub suction port 1311 and abuts the air supply air duct 30. The window packing 132 can be integrally molded by an injection molding process using a suitable material such as rubber. As shown in FIG. 1, in one or more embodiments, the observation window 15 is pivotally attached to the outer tub cover 13. The observation window 15 is disposed so as to be able to seal the opening 14. The observation window 15 can be made of ABS, tempered glass, or other suitable material. Preferably, the observation window 15 has a certain transparency, and the washing status of the laundry to be washed in the inner tub can be observed through the observation window 15.

[0026] As shown in FIG. 1, in one or more embodiments, the fan 20 is disposed at the top 121 of the tub 12 adjacent to the right side of the tub 12. Alternatively, the fan 20 may be disposed at the top 121 of the tub 12 adjacent to the left side of the tub 12. The fan 20 includes a volute 21, an impeller 22 (shown in FIG. 7) disposed within the volute 21, and a motor (not shown). A motor shaft of the motor is fixed to the impeller 22, and the motor is electrically connected to a controller (not shown) of the wall-mounted washing machine 1, so that the rotation of the impeller 22 can be driven by controlling the power on and off of the motor. The motor may include, but is not limited to, a stepping motor, a brushless motor, a servo motor, or any other suitable type of motor.

[0027] As shown in FIG. 4 and FIG. 5, in one or more embodiments, the volute 21 includes an upper volute 211 and a lower volute 212. The upper volute 211 and the lower volute 212 are butted against each other to define a blowing passage 213. To simplify the manufacturing process, the upper volute 211 can be integrally molded by injection molding using PP, ABS, or other suitable resin material. The upper volute 211 has a first horizontal top surface 2111, a helical curved surface 2112, and a second horizontal top surface 2113 that are in contact with each other in sequence. Based on the orientation shown in FIG. 4, the first horizontal top surface 2111 extends along a substantially horizontal direction. As shown in FIG. 5, a motor mounting groove 21111 recessed inward is formed in the first horizontal top surface 2111. The motor mounting groove 21111 is arranged to accommodate a motor, so that the motor can be fixed in the motor mounting groove 21111. The motor shaft of the motor extends from the motor mounting groove 21111 into the inside of the volute 21 and forms a fixed connection with the impeller 22 (shown in FIG. 6). The manner of fixing the motor shaft and the impeller 22 includes, but is not limited to, screw fixing, bolt fixing, riveting, etc. The impeller 22 is disposed directly below the first horizontal top surface 2111, i.e., the first horizontal top surface 2111 is approximately perpendicular to the axis C of the impeller 22. The helical curved surface 2112 extends from the first horizontal top surface 2111 in a counterclockwise direction to the second horizontal top surface 2113. Alternatively, the helical curved surface 2112 may be disposed to extend from the first horizontal top surface 2111 in a clockwise direction to the second horizontal top surface 2113 (at this time, the volute 21 is disposed at the top 121 of the tank body 12 and adjacent to the left side of the tank body 12). The second horizontal top surface 2113 extends from the end of the helical curved surface 2112 in a direction perpendicular to the axis C of the impeller 22. When the volute 21 is fixed to the top 121 of the tank body 12, the second horizontal top surface 2113 faces the front end of the outer tank 10. The second horizontal top surface 2113 and the first horizontal top surface 2111 have a height difference H in the direction of the axis C of the impeller 22 (the second horizontal top surface 2113 is higher than the first horizontal top surface 2111).The height difference H satisfies H = (0.2 to 0.6) × R (where R is the radius of the impeller 22), so that the second horizontal top surface 2113 and the first horizontal top surface 2111 have an appropriate height difference H in the direction of the axis C of the impeller 22, which can satisfy the increase in the overall space of the outlet passage 213 and prevent too much space from being occupied due to the height difference H being too large.

[0028] As shown in Figures 4 and 5, in one or more embodiments, the lower volute 212 and the upper volute 211 are arranged to abut against each other. The lower volute 212 and the upper volute 211 are fixed to each other by welding, screw fixing, bolt fixing, or other suitable methods. The lower volute 212 can be integrally molded by injection molding using PP, ABS, or other suitable resin materials. As shown in Figures 4, 5, and 8, the lower volute 212 has a first horizontal bottom surface 2121, an oblique curved surface 2122, and a second horizontal bottom surface 2123 that are in contact with each other in sequence. The first horizontal bottom surface 2121 extends along a direction perpendicular to the axis C of the impeller 22. As shown in Figure 8, a fan intake port 215 is formed in the first horizontal bottom surface 2121. The fan inlet 215 is disposed directly below the impeller 22, so that when the impeller 22 rotates, it draws in air from the fan inlet 215, pushes it into the outlet passage 213, and then pushes the air to flow out along the outlet passage 213. The fan inlet 215 is disposed in a substantially circular shape, and preferably has a diameter smaller than the outer diameter of the impeller 22. As shown in FIG. 4 and FIG. 5, the inclined curved surface 2122 extends obliquely upward from the first horizontal bottom surface 2121 to the second horizontal bottom surface 2123. Based on the orientation shown in FIG. 4, the inclined curved surface 2122 is disposed to extend to the upper left. Alternatively, the inclined curved surface 2122 may be disposed to extend to the upper right (in this case, the volute 21 is disposed at the top 121 of the tank body 12 and close to the left side of the tank body 12). In one or more embodiments, the inclined curved surface 2122 is arranged to fit into the arc-shaped wall of the top 121 of the outer tub 10, so that the volute 21 can be further attached to the top 121 of the outer tub 10, and the structure of the wall-mounted washing machine 1 becomes more compact. As shown in FIG. 4 and FIG. 5, the second horizontal bottom surface 2123 extends from the end of the inclined curved surface 2122 along a direction perpendicular to the axis C of the impeller 22, and the second horizontal bottom surface 2123 is higher than the first horizontal bottom surface 2121 along the axis C of the impeller 22. When the volute 21 is fixed to the top 121 of the tub body 12, the second horizontal bottom surface 2123 faces the front end of the outer tub 10. The second horizontal bottom surface 2123 and the end of the second horizontal top surface 2113 (close to the front end of the outer tub 10) define the fan exhaust port 216.The fan exhaust port 216 is disposed so as to be in contact with the air supply duct 30 in order to transport the dry hot air generated by the fan 20 into the outer tub 10 .

[0029] As shown in Fig. 6, in one or more embodiments, a volute tongue 214 is further formed in the volute 21. The volute tongue 214 is disposed at a position where the first horizontal bottom surface 2121 and the inside of the inclined curved surface 2122 are in contact with each other, and extends along a direction perpendicular to the first horizontal bottom surface 2121. The installation of the volute tongue 214 can prevent a portion of the air from circulating in the volute 21, thereby improving the air delivery efficiency of the fan 20 and reducing noise. The arc degree of the volute tongue 214 can be obtained according to experiments or experiences in order to reduce noise when the air passes over the surface of the volute tongue 214.

[0030] As shown in Fig. 9, a portion of the contour of the volute 21 is arranged as an involute curve. In one or more embodiments, the involute curve has thirteen reference lines, which are a first reference line l1, a second reference line l2, ..., a twelfth reference line l1, 12 and the 13th Reference Line 13 The first reference line l1 is set as the shortest connecting line from the center O of the impeller 22 to the volute tongue 214. In one or more embodiments, the maximum wrap angle α of the involute curve is in the range of 250° to 300°, i.e., the first reference line l1 and the thirteenth reference line l2 are set as the shortest connecting line from the center O of the impeller 22 to the volute tongue 214. 13 The angle α between the center O of the impeller 22 and the volute tongue 214 is in the range of 250° to 300°. By setting a relatively large range of the maximum wrap angle α, it is possible to obtain good fan performance, improve the air delivery efficiency of the fan 20, and increase the blowing amount. In one or more embodiments, the length L1 of the first reference line l1, i.e., the length of the shortest connecting line from the center O of the impeller 22 to the volute tongue 214, is L1. The length of the second reference line l2 is L2, and satisfies L2 = (1.02 to 1.1) × L1. By analogy therewith, the third reference line l3, the fourth reference line l4, ..., the twelfth reference line l5, ..., the eleventh reference line l6, ..., the eleventh reference line l7, ..., the eleventh reference line l8, ..., the eleventh reference line l9, ..., the eleventh reference line l10, ..., the eleventh reference line l1 ... 12 , 13th Reference Line l 13 The length of each is Ln =(1.02~1.1)×L (n-1) where n is an integer between 3 and 13. The ratio of the length of each reference line to the length of the adjacent reference line is the same, for example, 1.05, or any other suitable ratio greater than or less than 1.05. The second reference line l2 and the first reference line l1 define a predetermined angle β. Correspondingly, the third reference line l3, the fourth reference line l4, ..., the twelfth reference line l 12 , 13th Reference Line l 13 The same predetermined angle β is also sandwiched between every two adjacent reference lines among the nth reference line. The predetermined angle β ranges from 20° to 30°, and the relationship between the predetermined angle β and the maximum wrap angle α satisfies α=(n-1)×β. Alternatively, the number of reference lines may be arranged in other suitable numbers more or less than 13, for example, 9 or 15. As can be understood, the start point of the involute curve is the end point of the first reference line l1 facing the center O, and the end point of the involute curve is the end point of the nth reference line l2 facing the center O. n The involute curve passes through the end points of each reference line that face the circle center O, and an arc-shaped involute curve is formed by fitting the discrete end points to a curve. Note that "fitting" here refers to forming a smooth curve by constructing a data relationship or a data model for predetermined discrete data points using a curve fitting method.

[0031] When the upper volute 211 and the lower volute 212 are butted against each other and assembled, the volute 21 defines the discharge passage 213. Since part of the outline of the volute 21 is arranged as an involute curve, the cross section along the discharge direction in the radial direction of the discharge passage 213 (i.e., the direction perpendicular to the axis C of the impeller 22) gradually becomes larger, the flow speed of the air flowing through that part of the discharge passage 213 gradually slows down, and part of the kinetic energy is converted into static pressure energy. In addition, the helical surface 2112 on the upper volute 211 is arranged to extend spirally upward from the first horizontal top surface 2111 to the second horizontal top surface 2113, so that the height in the axial direction (i.e., the direction of the axis C of the impeller 22) of the part of the blow-out passage 213 corresponding to the helical surface 2112 gradually increases along the extension direction of the helical surface 2112, the cross-section of that part of the blow-out passage 213 also gradually increases, the flow velocity of the air passing through that part of the blow-out passage 213 correspondingly decreases, and some of the kinetic energy is further converted into static pressure energy. When air passes through the portion of outlet passage 213 corresponding to oblique curved surface 2122, oblique curved surface 2122 extends obliquely upwards, so that the cross section of that portion of outlet passage 213 gradually becomes smaller and the flow velocity of the air passing through that portion of outlet passage 213 gradually increases, whereby some of the static pressure energy is converted back into kinetic energy, thereby increasing the amount of air blown out and improving the air supply efficiency of fan 20.

[0032] As shown in FIG. 6, in one or more embodiments, the impeller 22 can be integrally molded by injection molding using PP, PPS or other suitable resin materials to simplify the manufacturing process. The impeller 22 has a generally circular shape. In one or more embodiments, the length L1 of the shortest connecting line l1 from the center O of the impeller 22 to the volute tongue 214 and the radius R of the impeller 22 satisfy L1=(1.05-1.2)×R, so that the gap between the volute tongue 214 and the outer diameter of the impeller 22 is appropriate, which can prevent the efficiency of the fan 20 from decreasing due to the gap being too large, and can also prevent the generation of loud noise due to the gap being too small. The impeller 22 has a plurality of blades 221 equally spaced around its axis C. It should be understood that the number of blades 221 and the interval between adjacent blades 221 can be adjusted as needed. In one or more embodiments, the impeller 22 is arranged as a forward-curved impeller (i.e., the blade outlet angle is greater than 90°). By arranging the impeller 22 as a forward-curved impeller, a higher pressure head can be obtained, and a larger air flow rate can be obtained under the same conditions (i.e., the motor output power, the blade size, the number of blades, the blade spacing, etc.). Alternatively, the impeller 22 may be arranged as a radial or backward-curved impeller. As shown in FIG. 7, the blade outlet angle of each blade 221 is set to the same predetermined angle γ, which can make the force reception of each blade 221 more uniform, and further make the airflow caused by the rotation of the impeller 22 more stable, and can also extend the service life of the impeller 22. In order to obtain a suitable blade outlet angle, the range of the predetermined angle γ is 145° to 155°, which can avoid the blade being deformed due to the pressure head being too large caused by the oblique angle being too large, and can also prevent the air flow rate from being affected due to the pressure head being too small caused by the oblique angle being too small.

[0033] As shown in FIG. 6, in one or more embodiments, a heating element 23 is installed in the volute 21 at a position adjacent to the fan exhaust port 216. The heating element 23 can heat the air generated by the fan 20 to convert it into dry air with dry heat. The heating element 23 includes a heater that converts electric energy into thermal energy. The heater can be a heating tube, a heating wire, a heating sheet, or other suitable element. Preferably, the heating element 23 further includes a temperature control switch (not shown) for controlling the temperature of the heater, and the heater is electrically connected to the control system of the wall-mounted washing machine appliance 1 through the temperature control switch, thereby automatically controlling the power off of the heater when the heater overheats.

[0034] As shown in FIG. 1, in one or more embodiments, the air supply duct 30 includes a first end 31 connected to the fan exhaust port 216 of the volute 21, and a second end 32 connected to the outer tank intake port 1311. In one or more embodiments, the air supply duct 30 includes an upper air supply air duct case part and a lower air supply air duct case part (not shown), and the upper air supply air duct case part and the upper volute 211, and the lower air supply air duct case part and the lower volute 212 are all integrally molded by an injection molding process, so that when air passes through the first end 31, there is no increase in wind resistance due to the presence of a mounting gap, which affects the air supply efficiency. The second end 32 of the air supply air duct 30 has a rectangular and chamfered cross section. Alternatively, the second end 32 may be installed in other suitable cross sections, such as trapezoidal, elliptical, etc. The second end 32 of the air supply duct 30 is positioned so that it can be inserted into the connection portion 1322 of the window packing 132 and extend into the outer tub suction port 1311, thereby enabling the air supply duct 30 to achieve an effective seal between the outer tub suction port 1311 and prevent the dry air from leaking out through the installation gap, affecting the drying efficiency and generating noise.

[0035] As shown in FIG. 1, in one or more embodiments, the return air duct 40 includes an air duct body 41 and an air duct cover 42. The return air duct 40 is arranged to convert the humid and hot air in the outer tub 10 into dry and cold air and condensed water. Based on the orientation shown in FIG. 1, the return air duct 40 is arranged on the right side of the tub body 12 and extends along the vertical direction. Alternatively, the return air duct 40 may be arranged on the left side of the tub body 12 and extend along the vertical direction (in this case, the volute 21 is arranged on the top 121 of the tub body 12 and close to the left side of the tub body 12). The air duct body 41 is arranged to extend along the vertical direction integrally with the right side wall 122 of the tub body 12, thereby making the structure of the entire wall-mounted washing machine 1 more compact. Based on the orientation shown in FIG. 1, the air duct body 41 includes a part of the arc-shaped wall 411 formed on the right side wall 122 of the tank body 12, an inverted L-shaped peripheral wall 412 extending from the edge of the arc-shaped wall 411 to the right along a substantially horizontal direction, and a top wall 413 formed on the top of the inverted L-shaped peripheral wall 412. A bottom inlet 4111 is provided near the bottom of the arc-shaped wall 411. The bottom inlet 4111 overlaps with the outer tank air outlet 1221. A top outlet 4131 is provided on the top wall 413. The top outlet 4131 is arranged so as to be abutted against the fan intake 215. As shown in FIG. 2, the inverted L-shaped peripheral wall 412 and the top wall 413 define a side opening 414 extending along a substantially vertical direction. The air duct cover 42 is detachably fixed to the air duct body 41 and arranged to be able to seal the side opening 414. The installation of the air duct cover 42 and the side opening 414 can meet the process requirements for integrally molding the air duct body 41 and the outer tank 10. In order to facilitate the user to remove the air duct cover 42 and clean the inside of the return air duct 40 through the side opening 414, the fixing manner of the air duct cover 42 and the air duct body 41 includes, but is not limited to, screw connection, bolt connection or rivet connection. Preferably, a seal member (not shown) is further arranged between the air duct cover 42 and the side opening 414, so that the air duct cover 42 can effectively seal the side opening 414 and prevent air from leaking out through the installation gap.

[0036] In one or more embodiments, a condensation assembly (not shown) is further installed in the return air duct 40. The condensation assembly can be disposed at a suitable location in the return air duct 40, for example, adjacent to the top of the bottom inlet 4111, thereby condensing the humid air flowing in from the bottom inlet 4111. The condensation assembly includes a condenser (not shown), which can be a fin-tube type condenser, a serpentine type condenser, or other suitable condensation element. The humid air in the tank body 12 flows into the return air duct 40 through the outer tank outlet 1221 (i.e., the bottom inlet 4111), and is changed into dry cold air and condensed water after passing through the condenser surface. Alternatively, a condensation sprayer (e.g., a cold water sprayer) may be installed in the return air duct 40 to cool and dehumidify the humid air. The impeller 22 rotates to create negative pressure in the return air duct 40 below the fan inlet 215, thereby drawing in dry, cool air and drawing it into the volute 21, forming air circulation. The condensed water flows from the bottom inlet 4111 located at the bottom of the return air duct 40 along the inner wall of the return air duct 40, which extends vertically, into the inside of the tank body 12 due to its own gravity, and is discharged from the tank body 12 through a drain (not shown) along the bottom wall of the tank body 12, preventing the condensed water from accumulating in the return air duct 40 and breeding bacteria and generating unpleasant odors.

[0037] Up to now, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings, but as can be understood by those skilled in the art, the protection scope of the present invention is obviously not limited to these specific embodiments. On the premise of not departing from the principle of the present invention, those skilled in the art can combine the technical features of different embodiments, and make equivalent modifications or substitutions to the relevant technical features, and all of these modified or substituted technical solutions are included in the protection scope of the present invention. [Explanation of symbols]

[0038] 1. Wall-mounted washing machine 10...Outer tank 11…Back plate 12...tank body 121...Top 122…Side wall 1221…Outer tank outlet 123...front end 124…rear end 13…Outer tank cover 131...Circular wall 1311…Outer tank suction port 132…Window packing 1321...Window packing body 1322…Connection 14...Aperture 15...Observation window 20…Fan 21...Volute 211…Upper volute 2111…First horizontal surface 21111…Motor mounting groove 2112…Spiral curved surface 2113…Second horizontal top surface 212…Lower volute 2121…First horizontal bottom surface 2122... Oblique curved surface 2123…Second horizontal bottom 213...Blowout passage 214…Volute tongue 215…Fan intake 216…Fan exhaust port 22...Impeller 221...Feather 23... Heating member 30…Air supply duct 31...First end 32...Second end 40…Return air duct 41…Air duct body 411…Circular wall 4111…Bottom entrance 412...Inverted L-shaped wall 413…Top wall 4131…Top exit 414...Side opening 42…Air duct cover

Claims

1. an outer casing; and a fan fixed to a top of the outer casing, the fan including a volute and an impeller disposed within the volute, the volute including: an upper volute having a first horizontal top surface, a helical curved surface, and a second horizontal top surface that are in contact with each other in sequence, the first horizontal top surface and the second horizontal top surface being perpendicular to an axis of the impeller, and the helical curved surface being arranged to extend in a spiral upward direction from the first horizontal top surface to the second horizontal top surface; a lower volute abutting against the upper volute to define a blow-out passage, the lower volute having a first horizontal bottom surface perpendicular to the axis, whereby a height of a portion of the blow-out passage corresponding to the helical curved surface gradually increases along an extension direction of the helical curved surface; The fan further includes a volute tongue, the length of the shortest connecting line from the center of the impeller to the volute tongue is L 1 , the radius of the impeller is R, and L 1 =(1.05-1.2)×R; a part of an outer contour of a projection plane of the volute perpendicular to the axis is an involute curve, and a maximum wrap angle α of the involute curve is in the range of 250° to 300°; The lower volute further includes an oblique curved surface and a second horizontal bottom surface, the second horizontal bottom surface is parallel to the second horizontal top surface, the second horizontal bottom surface is higher than the first horizontal bottom surface in the direction of the axis, the oblique curved surface is arranged to extend obliquely upward from the first horizontal bottom surface to the second horizontal bottom surface, and the oblique curved surface fits into the arc-shaped wall of the top of the outer tank; A wall-mounted washing machine appliance, characterized in that the height difference H in the direction of the axis between the second horizontal top surface and the first horizontal top surface is smaller than the height difference in the direction of the axis between the second horizontal bottom surface and the first horizontal bottom surface.

2. The involute curve has n reference lines, Here, the first reference line l １ is the shortest connecting line from the center of the impeller to the volute tongue, and the shortest connecting line length L １ Each of the reference lines has a length L ｎ = (1.02 to 1.1) x L （ｎ－１） 2. The wall-mounted washing machine according to claim 1, wherein a predetermined angle β is formed between every two adjacent reference lines, the predetermined angle β is in the range of 20° to 30°, and n is an integer of 3 or more.

3. 2. The wall-mounted washing machine according to claim 1, wherein a height difference H between the second horizontal top surface and the first horizontal top surface in the direction of the axis satisfies H=(0.2 to 0.6)×R.

4. 2. The wall-mounted washing machine of claim 1, wherein the spiral surface extends in a clockwise or counterclockwise direction, and the second horizontal top surface and the second horizontal bottom surface extend toward a front end of the outer tub.

5. The impeller has a plurality of blades arranged at equal intervals around the axis, and each of the blades has a blade outlet angle of the same predetermined angle γ, and the predetermined angle γ is in the range of 145° to 155°.

6. A fan inlet is formed at the center of the first horizontal bottom surface, and a fan exhaust port is defined at the end of the second horizontal top surface and the second horizontal bottom surface. The wall-mounted washing machine appliance further comprises: an air supply duct connected to the fan exhaust port and the suction port of the outer tank; A wall-mounted washing machine according to any one of claims 1 to 5, characterized in that the wall-mounted washing machine includes a return air duct having a bottom inlet and a top outlet, the bottom inlet overlapping with the air outlet of the outer tub, and the top outlet being arranged to abut against the fan intake port.

7. 7. The wall-mounted washing machine according to claim 6, wherein a heating member is installed in the volute at a position adjacent to the fan exhaust port.

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