Air supply structure and electric water heater

Abstract

The invention belongs to the technical field of electric water heaters, and discloses an air supply structure and an electric water heater. According to the air supply structure, a wind wheel motor is supported by a first supporting structure, and the wind wheel motor is clamped between a motor cover plate and the first supporting structure; meanwhile, a rotating part connected with the cross-flow wind wheel is supported by the second supporting structure, and the rotating part is clamped between the wind wheel cover plate and the second supporting structure, so that one axial end of the cross-flow wind wheel is rotatably mounted between the wind wheel cover plate and the second supporting structure through the rotating part; the first supporting structure and the second supporting structure limit the cross-flow wind wheel and the wind wheel motor in the axial direction, the motor cover plate and the wind wheel cover plate limit the cross-flow wind wheel and the wind wheel motor in the radial direction, the stability of the cross-flow wind wheel in the rotating process is effectively improved, noise generated by shaking of the cross-flow wind wheel and the wind wheel motor is reduced, and the service life of the cross-flow wind wheel and the wind wheel motor is prolonged. And noise in the working process of the air supply structure is reduced.

Description

Technical Field

[0001] This invention relates to the field of electric water heater technology, and more particularly to an air supply structure and an electric water heater. Background Technology

[0002] The function of existing electric water heaters is to produce hot water for users. In winter, the temperature in the bathroom is low, and the ambient temperature is also low when users shower, resulting in a poor showering experience. To address this, existing technologies have proposed equipping electric water heaters with a heating system, but it has been found that the heating system is quite noisy during use. Summary of the Invention

[0003] One of the technical problems solved by this invention is to provide an air supply structure that can reduce noise and improve stability.

[0004] The second technical problem solved by this invention is to provide an electric water heater that reduces noise, improves stability, and enhances user experience.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] The air supply structure includes:

[0007] An air supply housing, wherein the inner bottom wall of the air supply housing is provided with a first support structure and a second support structure that are axially spaced apart, the first support structure is connected to a motor cover plate located above it, and the second support structure is connected to a wind turbine cover plate located above it.

[0008] A cross-flow wind turbine, one end of which is connected to a rotating component, the rotating component being clamped between the wind turbine cover plate and the second support structure along both the radial and axial directions of the cross-flow wind turbine;

[0009] A wind turbine motor is coaxially arranged with the cross-flow wind turbine, and the output shaft of the wind turbine motor is connected to the other end of the cross-flow wind turbine to drive the cross-flow wind turbine to rotate; the wind turbine motor is sandwiched between the motor cover plate and the first support structure along both the radial and axial directions of the cross-flow wind turbine.

[0010] The air supply structure described in this invention has the following advantages compared with the prior art:

[0011] The air supply structure provided by this invention comprises a first support structure supporting a wind turbine motor, which is sandwiched between a motor cover plate and the first support structure. Simultaneously, a second support structure supports a rotating component connected to the cross-flow wind turbine, which is sandwiched between the wind turbine cover plate and the second support structure. This allows one axial end of the cross-flow wind turbine to be rotatably mounted between the wind turbine cover plate and the second support structure via the rotating component. The first and second support structures limit the cross-flow wind turbine and wind turbine motor in the axial direction, while the motor cover plate and wind turbine cover plate limit them in the radial direction. This effectively improves the stability of the cross-flow wind turbine during rotation, thereby reducing noise generated by the shaking of the cross-flow wind turbine and wind turbine motor, and reducing noise during the operation of the air supply structure.

[0012] In one embodiment, the air supply housing has an air supply channel, with an air inlet and an air outlet formed at both ends of the air supply channel, and a first volute tongue guide wall and a second volute tongue guide wall that both extend circumferentially along the cross-flow impeller are formed on the upper inner wall of the air supply channel, with the first volute tongue guide wall located on the side of the second volute tongue guide wall closer to the air inlet.

[0013] The first volute guide wall is an arc surface with a distance of R1 from the central axis of the cross-flow impeller, and the distance between the second volute guide wall and the central axis of the cross-flow impeller is R2, where R1 < R2. R2 gradually increases from the air outlet to the air inlet.

[0014] In one embodiment, the direction in which the first volute tongue guide wall extends from one end of it connecting to the second volute tongue guide wall to the other end is the rotation direction of the cross-flow impeller.

[0015] The cross-flow wind turbine includes a wind turbine shaft and a plurality of blades arranged circumferentially around the wind turbine shaft. The two ends of the blades are respectively formed into a proximal end and a distal end, and the proximal end is closer to the wind turbine shaft than the distal end.

[0016] In any two adjacent blades distributed along the rotation direction of the cross-flow wind turbine, the proximal end of the downstream blade is located between the proximal end of the upstream blade and the distal end of the upstream blade.

[0017] In one embodiment, the minimum radial clearance between the second volute guide wall and the maximum outer diameter of the cross-flow impeller is dmin, and the maximum radial clearance between the second volute guide wall and the maximum outer diameter of the cross-flow impeller is dmax; the ratio of dmax to dmin is less than or equal to 1.5.

[0018] In one embodiment, a heating component is provided in the air supply channel downstream of the cross-flow fan. From the air inlet to the air outlet, the heating component is located downstream of the cross-flow fan, and the air supply channel upstream of the cross-flow fan forms an air inlet channel, while the air supply channel downstream of the cross-flow fan forms an air outlet channel.

[0019] The air supply housing is provided with two heat insulation plates spaced apart along the axial direction of the cross-flow impeller. The two heat insulation plates divide the inner cavity of the air supply housing into two installation chambers that are directly connected to the outside atmosphere, and the air supply channel located between the two installation chambers. Both installation chambers are connected to the air inlet channel.

[0020] The first support structure is disposed in one of the mounting chambers, and the second support structure is disposed in the other mounting chamber.

[0021] In one embodiment, a waterproof sleeve is provided in the air supply channel, the waterproof sleeve is located between the heating component and the air inlet, and the waterproof sleeve passes through the air supply housing (1), the waterproof sleeve is used for the passage of pipelines.

[0022] In one embodiment, the air supply structure further includes a sterilization component, the mounting end of which is disposed in the mounting chamber and mounted on the heat insulation plate forming the mounting chamber, the working end of which passes through the heat insulation plate and is placed in the air supply channel, and the sterilization component is used to sterilize the airflow flowing in the air supply channel.

[0023] In one embodiment, the air supply housing includes a first air outlet wall and a second air outlet wall forming opposite side walls of the air outlet;

[0024] One end of the heating component is snapped into the second air outlet wall, and the other end of the heating component is connected to the first air outlet wall by fasteners.

[0025] In one embodiment, the heating assembly includes:

[0026] A heating grille having a mounting slot, the outlet direction of the mounting slot being opposite to the air outlet direction;

[0027] A heating unit, wherein the heating unit is located within the mounting slot and is mounted on the heating grid;

[0028] A thermostat is installed on the heating grill with one end extending into the mounting chamber and the other end inserted into the heating grill and electrically connected to the heating unit. The thermostat is used to control the start and stop of the heating unit.

[0029] The second technical problem mentioned above is solved by the following technical solution:

[0030] An electric water heater includes a water heater housing and an air supply structure as described in any of the above embodiments, wherein the air supply housing is installed at the bottom of the water heater housing.

[0031] Compared with the prior art, the electric water heater described in this invention has the following advantages:

[0032] The electric water heater provided in this embodiment of the invention includes the aforementioned air supply structure. A first support structure supports a fan motor, which is sandwiched between a motor cover plate and the first support structure. Simultaneously, a second support structure supports a rotating component connected to the cross-flow fan, which is sandwiched between the fan cover plate and the second support structure. This allows one axial end of the cross-flow fan to be rotatably mounted between the fan cover plate and the second support structure via the rotating component. The first and second support structures limit the cross-flow fan and fan motor in the axial direction, while the motor cover plate and fan cover plate limit the cross-flow fan and fan motor in the radial direction. This effectively improves the stability of the cross-flow fan during rotation, thereby reducing the noise generated by the cross-flow fan and fan motor due to shaking, and reducing the noise during the operation of the air supply structure. Attached Figure Description

[0033] Figure 1 This is a first exploded view of the air supply structure provided in an embodiment of the present invention;

[0034] Figure 2 This is a first cross-sectional view of the air supply structure provided in an embodiment of the present invention;

[0035] Figure 3 This is a second sectional view of the air supply structure provided in an embodiment of the present invention;

[0036] Figure 4 yes Figure 1 A magnified view of a section at point E in the middle;

[0037] Figure 5 yes Figure 1 A magnified view of a section at point F in the middle;

[0038] Figure 6 yes Figure 2 A magnified view of a section at point I;

[0039] Figure 7 This is a second exploded view of the air supply structure provided in an embodiment of the present invention;

[0040] Figure 8 This is a third sectional view of the air supply structure provided in the embodiment of the present invention;

[0041] Figure 9This is a fourth sectional view of the air supply structure provided in the embodiment of the present invention;

[0042] Figure 10 yes Figure 1 A magnified view of a section at point H in the middle;

[0043] Figure 11 yes Figure 1 A magnified view of a section at point M;

[0044] Figure 12 yes Figure 9 A magnified view of a portion of point P in the middle;

[0045] Figure 13 This is a cross-sectional view of an electric water heater provided in an embodiment of the present invention;

[0046] Figure 14 This is a simulation diagram of the airflow noise of the air supply structure provided in the embodiment of the present invention;

[0047] Figure 15 This is a structural schematic diagram of an electric water heater provided in an embodiment of the present invention.

[0048] In the picture:

[0049] 1. Air supply housing; 11. Top cover; 111. First sealing surface; 112. Second sealing surface; 113. Positioning groove; 114. Third sealing surface; 115. Annular groove; 116. Pipe hole; 12. Outer cover; 121. First air outlet wall; 1211. First limiting protrusion; 122. Second air outlet wall; 1221. Locking hole; 1222. Plate body; 1223. Sealing plate; 1224. Cable routing plate; 1225. Cable routing hole; 123. Positioning protrusion; 124. Fastening 125. Boss; 1251. Receiving groove; 1252. Clearance hole; 126. Waterproof sleeve; 1261. Through hole; 13. Heat insulation plate; 13a. First heat insulation plate; 13b. Second heat insulation plate; 131. Through hole; 132. Air passage hole; 14. First support structure; 141. First support groove; 142. First mounting limiting surface; 15. Second support structure; 151. Second support groove; 16. Fan wheel cover plate; 17. Motor cover plate; 18. First drain cover;

[0050] 110. Air supply duct; 1101. First air outlet duct; 1102. Second air outlet duct; 1103. First volute guide wall; 1104. Second volute guide wall; 1105. First gap; 1106. Second gap; 1107. Air inlet duct; 1108. Air inlet guide wall; 1109. Air outlet guide wall; 120. Installation chamber; 130. Air inlet; 140. Air outlet;

[0051] 2. Cross-flow wind turbine; 21. Blade; 221. Near end; 222. Far end; 22. Wind turbine shaft;

[0052] 3. Wind turbine motor;

[0053] 4. Heating assembly; 41. Heating grille; 411. Locking protrusion; 412. Second limiting protrusion; 413. Temperature control mounting through hole; 414. Mounting slot; 42. Heating unit; 43. Temperature controller;

[0054] 5. Sterilization components; 6. Rotating parts;

[0055] 71. Swing plate; 72. Rotating rod; 73. Swing motor;

[0056] 8. Air intake grille;

[0057] 91. Water heater outer shell; 92. Inner tank; 93. Drain pipe; 94. Second drain cover; 95. Water pipe connector. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0059] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0060] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0061] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0062] For ease of description and understanding, in the embodiments of the present invention, when the side facing the electric water heater is used to set the control panel, the side of the battery water heater facing the user is the front side, and the side of the battery water heater facing away from the user is the rear side.

[0063] Some embodiments of the present invention provide an air supply structure and an electric water heater. The electric water heater includes an air supply structure that can selectively provide hot air, ambient air, or sterilize and purify the air in the bathroom according to user needs, thereby improving the environmental quality in the bathroom and enhancing the user experience.

[0064] like Figures 1 to 3 As shown, the air supply structure includes an air supply housing 1, a cross-flow impeller 2, an impeller motor 3, a heating component 4, and a sterilization component 5. The air supply housing 1 is provided with an air supply channel 110, and the two ends of the air supply channel 110 form an air inlet 130 and an air outlet 140, respectively.

[0065] The cross-flow fan 2 is rotatably disposed in the air supply channel 110, so that the airflow in the air supply channel 110 can flow from the air inlet 130 to the air outlet 140; the fan motor 3 is installed in the air supply housing 1, and the output shaft of the fan motor 3 is connected to the cross-flow fan 2 to drive the cross-flow fan 2 to rotate.

[0066] The heating component 4 is disposed in the air supply channel 110, and the sterilization component 5 is installed in the air supply housing 1 to sterilize the airflow flowing in the air supply channel 110.

[0067] Only the fan motor 3 can be controlled to work. For example, when the temperature in the bathroom is high, the fan motor 3 drives the cross-flow fan 2 to rotate. The air in the bathroom enters the air supply channel 110 through the air inlet 130 and is sent to the air outlet 140 by the cross-flow fan 2 and returns to the bathroom through the air outlet 140. This can effectively accelerate the air circulation in the bathroom and reduce the temperature in the bathroom.

[0068] The heating component 4 and the fan motor 3 can be controlled to work simultaneously. For example, when the temperature in the bathroom is low, the low-temperature air in the bathroom enters the air supply channel 110 through the air inlet 130. The fan motor 3 drives the cross-flow fan 2 to rotate, causing the airflow in the air supply channel 110 to flow. The heating component 4 heats the airflow flowing in the air supply channel 110. The heated air returns to the bathroom through the air outlet 140, thereby increasing the air temperature in the bathroom.

[0069] It can also control the operation of the sterilization component 5 and the fan motor 3 at the same time. For example, after the bathroom is finished, the humid air in the bathroom enters the air supply channel 110 through the air inlet 130. The fan motor 3 drives the cross-flow fan 2 to rotate, so that the airflow in the air supply channel 110 flows. The sterilization component 5 sterilizes the airflow in the air supply channel 110. The sterilized air returns to the bathroom through the air outlet 140, so as to achieve the purpose of purifying the air in the bathroom.

[0070] The air supply structure provided in this embodiment of the invention can selectively provide hot air or ambient air according to the user's needs, or sterilize and purify the air in the bathroom, effectively improving the environmental quality in the bathroom and enhancing the user experience.

[0071] In some embodiments, such as Figure 1 , Figure 4 and Figure 5 As shown, a first support structure 14 protrudes from the inner bottom wall of the air supply housing 1. The first support structure 14 is connected to a motor cover plate 17 located above it. A second support structure 15 protrudes from the inner bottom wall of the air supply housing 1. The second support structure 15 is connected to a wind turbine cover plate 16 located above it. The first support structure 14 and the second support structure 15 are spaced apart along the axial direction of the cross-flow wind turbine 2.

[0072] The wind turbine motor 3 and the cross-flow wind turbine 2 are coaxially arranged. One axial end of the cross-flow wind turbine 2 is connected to a rotating component 6. The rotating component 6 is clamped between the wind turbine cover plate 16 and the second support structure 15 along both the radial and axial directions of the cross-flow wind turbine 2. The other axial end of the cross-flow wind turbine 2 is connected to the output shaft of the wind turbine motor 3. The wind turbine motor 3 is clamped between the motor cover plate 17 and the first support structure 14 along both the radial and axial directions of the cross-flow wind turbine 2.

[0073] The first support structure 14 supports the wind turbine motor 3 and clamps the wind turbine motor 3 between the motor cover plate 17 and the first support structure 14. At the same time, the second support structure 15 supports the rotating component 6 connected to the cross-flow wind turbine 2 and clamps the rotating component 6 between the wind turbine cover plate 16 and the second support structure 15. This allows one axial end of the cross-flow wind turbine 2 to be rotatably mounted between the wind turbine cover plate 16 and the second support structure 15 through the rotating component 6. The first support structure 14 and the second support structure 15 limit the cross-flow wind turbine 2 and the wind turbine motor 3 in the axial direction, while the motor cover plate 17 and the wind turbine cover plate 16 limit the cross-flow wind turbine 2 and the wind turbine motor 3 in the radial direction. This effectively improves the stability of the cross-flow wind turbine 2 during rotation, thereby reducing the noise generated by the cross-flow wind turbine 2 and the wind turbine motor 3 due to shaking, and reducing the noise during the operation of the air supply structure.

[0074] In some embodiments, the first support structure 14 and the motor cover 17 are detachably connected, and the second support structure 15 and the wind turbine cover 16 are detachably connected, which is beneficial for the later maintenance and replacement of the wind turbine motor 3 and the cross-flow wind turbine 2.

[0075] For example, the motor cover 17 is fastened to the first support structure 14, and the impeller cover 16 is fastened to the second support structure 15.

[0076] This design facilitates the disassembly and assembly of the wind turbine motor 3 and the cross-flow wind turbine 2, resulting in high efficiency and making it easier to maintain and replace the wind turbine motor 3 and the cross-flow wind turbine 2 in the future.

[0077] For example, the cross-flow wind turbine 2 includes a wind turbine shaft 22 and a plurality of blades 21 disposed on the wind turbine shaft 22. One axial end of the wind turbine shaft 22 is rotatably mounted between the wind turbine cover plate 16 and the second support structure 15 via a rotating member 6. By providing the rotating member 6, the rotational smoothness of the cross-flow wind turbine 2 can be improved and friction can be reduced.

[0078] For example, two first support structures 14 are provided, spaced apart along the axial direction of the wind turbine shaft 22. Each of the two first support structures 14 has a first support groove 141 with a first top opening and a first side opening. The two ends of the wind turbine motor 3 are respectively placed in the two first support grooves 141, and the bottom walls of the two first support grooves 141 support the wind turbine motor 3. The first side openings of the two first support grooves 141 are arranged opposite each other along the axial direction of the wind turbine shaft 22. The groove wall of each first support groove 141 opposite to its first side opening forms a first mounting limiting surface 142. The wind turbine motor 3 is clamped between the two first mounting limiting surfaces 142 along the axial direction of the wind turbine shaft 22 to limit the wind turbine motor 3 along the axial direction of the wind turbine shaft 22. Moreover, by using two first support structures 14 spaced apart along the axial direction of the wind turbine shaft 22 to support the wind turbine motor 3, the weight of the air supply structure can be reduced while meeting the support requirements of the wind turbine motor 3.

[0079] The motor cover plate 17 is provided with a first receiving groove with the opening facing downward. The part of the wind turbine motor 3 that extends out of the first top opening of the first support groove 141 is received in the first receiving groove. The wind turbine motor 3 is sandwiched between the groove wall of the first support groove 141 and the groove bottom wall of the first receiving groove along the radial direction of the wind turbine shaft 22, so as to limit the wind turbine motor 3 along the radial direction of the wind turbine shaft 22.

[0080] By limiting the wind turbine motor 3 along the axial direction of the cross-flow wind turbine 2 and along the radial direction of the wind turbine shaft 22, the stability of the wind turbine motor 3 can be improved, thereby improving the stability of the wind turbine motor 3 during rotation.

[0081] The second support structure 15 has a second support groove 151, which has a second top opening and a second side opening. The rotating member 6 is disposed in the second support groove 151 and is supported by the groove wall of the second support groove 151. The wind turbine cover plate 16 has a second receiving groove with the opening facing downward. The rotating member 6 is disposed in the space enclosed by the groove wall of the second support groove 151 and the groove wall of the second receiving groove. The rotating member 6 is clamped between the groove wall of the second support groove 151 and the groove wall of the second receiving groove along the radial direction of the wind turbine shaft 22, thereby limiting the second support structure 15 along the radial direction of the wind turbine shaft 22.

[0082] One end of the wind turbine shaft 22 passes through the second side opening and is connected to the inner ring of the rotating member 6. The second support groove 151 has two second mounting limiting surfaces arranged opposite each other along the axial direction of the wind turbine shaft 22. The rotating member 6 is clamped between the two second mounting limiting surfaces along the axial direction of the wind turbine shaft 22 to limit the rotation of the rotating member 6 along the axial direction of the wind turbine shaft 22.

[0083] By limiting the rotation of the rotating component 6 along the axial direction of the cross-flow wind turbine 2 and also along the radial direction of the cross-flow wind turbine 2, the stability of the rotating component 6 can be improved, thereby enhancing the stability of the cross-flow wind turbine 2 during rotation. Furthermore, by limiting the rotation of the rotating component 6 along both the axial and radial directions of the cross-flow wind turbine 2, and by limiting the wind turbine motor 3 along both the axial and radial directions of the cross-flow wind turbine 2, the stability of the air supply structure during operation can be improved, and noise can be reduced.

[0084] In some embodiments, such as Figures 1 to 5 As shown, a heating component 4 is installed in the air supply channel 110 downstream of the cross-flow fan 2. From the air inlet 130 to the air outlet 140, the air supply channel 110 upstream of the cross-flow fan forms an air inlet channel 1107, and the air supply channel 110 downstream of the cross-flow fan 2 forms an air outlet channel.

[0085] The air supply housing 1 is provided with two heat insulation plates 13 spaced apart along the axial direction of the cross-flow impeller 2. The two heat insulation plates 13 divide the inner cavity of the air supply housing 1 into two installation chambers 120 that are directly connected to the outside atmosphere, and an air supply channel 110 located between the two installation chambers 120. Both installation chambers 120 are connected to the air inlet channel 1107. A first support structure 14 is provided in one of the installation chambers 120, and a second support structure 15 is provided in the other installation chamber 120.

[0086] During the rotation of the cross-flow fan 2 driven by the fan motor 3, the heating component 4 operates. Outside air enters the two mounting chambers 120 and the air inlet channel 1107. The air in the two mounting chambers 120 enters the air inlet channel 1107, and then, under the action of the cross-flow fan 2, enters the air outlet channel, is heated by the heating component 4, and flows out. This configuration allows for air intake by simultaneously utilizing both mounting chambers 120 and the air inlet channel 1107, significantly increasing the air intake volume compared to using only the air inlet channel 1107.

[0087] As the wind turbine motor 3 drives the cross-flow wind turbine 2 to rotate, the wind turbine motor 3 generates heat, and the rotating component 6 generates frictional heat. By setting the first support structure 14 and the second support structure 15 in the two mounting chambers 120 respectively, the outside air can carry away the heat in the two mounting chambers 120 as it enters the mounting chambers 120 and the air inlet channel 1107 in sequence. This allows the rotating component 6 and the wind turbine motor 3 to work in a lower temperature environment, thus extending the service life of the rotating component 6 and the wind turbine motor 3.

[0088] In some embodiments, neither of the two mounting chambers 120 is connected to the air outlet duct. Since neither of the two mounting chambers 120 is connected to the air outlet duct and the heat insulation plate 13 has a heat insulation function, the heat transferred to the two mounting chambers 120 through the heat insulation plate 13 can be minimized, resulting in a lower temperature inside the mounting chambers 120. This allows the fan motor 3 and the rotating component 6 to operate in a lower temperature environment, extending their service life. Furthermore, it allows hot air to be concentrated in the air outlet duct and delivered into the bathroom through the air outlet 140, improving heat energy utilization. Optionally, the rotating component 6 is a bearing.

[0089] In some embodiments, such as Figure 2 , Figures 4 to 6As shown, the air supply housing 1 includes an outer cover 12 and an upper cover 11 located above the outer cover 12. Heat insulation plates 13 are fixed to the inner bottom wall of the outer cover 12. Both heat insulation plates 13 have upward-facing through holes 131, allowing the axial ends of the cross-flow impeller 2 to pass through the two through holes 131 and enter the two mounting chambers 120. The inner wall of the upper cover 11 has a first sealing surface 111 and a second sealing surface 112. The first sealing surface 111 is in contact with one of the heat insulation plates 13, and the second sealing surface 112 is in contact with the other heat insulation plate 13, thus forming an air outlet channel that is not connected to the two mounting chambers 120, consisting of the outer cover 12, the upper cover 11, and the two heat insulation plates 13. This arrangement improves the sealing performance at the connection between the heat insulation plates 13 and the upper cover 11, preventing hot air in the air outlet channel from leaking into the mounting chambers 120 through the connection between the heat insulation plates 13 and the upper cover 11.

[0090] The through hole 131 is a U-shaped hole with the opening facing upward and extending through the axial direction of the impeller shaft 22. When installing the cross-flow impeller 2, the impeller shafts 22 at both ends of the cross-flow impeller 2 fall into the through hole 131 below, which is beneficial for cooperating with the first support structure 14 and the second support structure 15 to install the cross-flow impeller 2. For ease of description, the two heat insulation plates 13 are referred to as the first heat insulation plate 13a and the second heat insulation plate 13b, respectively. The inner wall of the upper cover 11 is provided with a first sealing surface 111 and a second sealing surface 112. The first sealing surface 111, the first heat insulation plate 13a, the second heat insulation plate 13b and the second sealing surface 112 are arranged sequentially along the axial direction of the cross-flow impeller 2. The first heat insulation plate 13a contacts and seals with the first sealing surface 111 along the axial direction of the cross-flow impeller 2, and the second heat insulation plate 13b contacts and seals with the second sealing surface 112 along the axial direction of the cross-flow impeller 2. Thus, the first heat insulation plate 13a and the second heat insulation plate 13b divide the inner cavity of the air supply housing 1 into an air supply channel 110 and two installation chambers 120, and the air outlet channel and the two installation chambers 120 are not connected. For example, the first heat insulation plate 13a and the first support structure 14 are located at the same axial end of the cross-flow fan 2, and the second heat insulation plate 13b and the second support structure 15 are located at the same axial end of the cross-flow fan 2.

[0091] The gap between the inner wall of the through hole 131 and the impeller shaft 22 forms an air passage gap. The mounting chamber 120 is connected to the air inlet channel 1107 through the air passage gap. This not only allows air in the mounting chamber 120 to enter the air inlet channel 1107 through the air passage gap, but also prevents friction between the impeller shaft 22 and the inner wall of the through hole 131. It also facilitates the descent of the impeller shafts 22 at both ends of the cross-flow impeller 2 into the lower through hole 131. To increase the connection between the mounting chamber 120 and the air inlet channel 1107, the heat insulation plate 13 is also provided with an air passage hole 132. The mounting chamber 120 is connected to the air inlet channel 1107 through the air passage hole 132, allowing air in the mounting chamber 120 to enter the air inlet channel 1107 through the air passage hole 132.

[0092] In some embodiments, the heat insulation plate 13 is integrally formed on the outer cover 12; in other words, both the heat insulation plate 13 and the outer cover 12 are made of heat insulation material. The two heat insulation plates 13 are integrally formed on the outer cover 12, which is a simple and low-cost molding method.

[0093] In other embodiments, the heat insulation plate 13 may also be configured as a heat insulation body and a heat insulation layer coated on the surface of the heat insulation body.

[0094] In some embodiments, the upper cover 11 and the outer cover 12 are detachably connected to facilitate subsequent maintenance of the components inside the air supply housing 1. Exemplarily, the upper cover 11 and the outer cover 12 are securely connected. Specifically, as... Figure 1 , Figure 2 and Figure 7 As shown, one of the upper cover 11 and the outer cover 12 is provided with a positioning protrusion 123, and the other is provided with a positioning groove 113. The positioning protrusion 123 and the positioning groove 113 are inserted in the vertical direction to position the upper cover 11 and the outer cover 12, so as to facilitate the subsequent fastening connection of the upper cover 11 and the outer cover 12.

[0095] For example, two positioning protrusions 123 are provided on the outer cover 12. The positioning protrusions 123 extend along the length direction of the outer cover 12, and the two positioning protrusions 123 are spaced apart along the width direction of the outer cover 12. Positioning grooves 113 are provided one-to-one with the positioning protrusions 123. The inner bottom wall of the outer cover 12 is provided with a plurality of circumferentially spaced fastening protrusions 124. The upper cover 11 is provided with fastening holes corresponding one-to-one with the fastening protrusions 124. The fastening protrusions 124 and the corresponding fastening holes are connected by fasteners. The length direction, width direction and vertical direction of the outer cover 12 are perpendicular to each other.

[0096] The upper cover 11 and the outer cover 12 are positioned by inserting the positioning protrusion 123 and the positioning groove 113 in the vertical direction, so that the fastening protrusion 124 and the fastening hole are aligned, making it easy to connect the fastening protrusion 124 and the corresponding fastening hole by fasteners.

[0097] It should be noted that the length direction of the outer cover 12 refers to the left-right direction when the user is facing the control panel of the electric water heater; the width direction of the outer cover 12 refers to the front-back direction when the user is facing the control panel of the electric water heater, and the air outlet 140 is located on the front side of the electric water heater.

[0098] In some embodiments, such as Figure 1 and Figure 8 As shown, the installation end of the sterilization component 5 is located in the installation chamber 120 and installed on the heat insulation plate 13 forming the installation chamber 120. The working end of the sterilization component 5 passes through the heat insulation plate 13 and is placed in the air supply channel 110.

[0099] Specifically, the second heat insulation plate 13b is provided with a sterilization installation through hole. The working end of the sterilization component 5 passes through the sterilization installation through hole and extends into the air supply channel 110. The installation end of the sterilization component 5 is securely installed on the second heat insulation plate 13b. The sterilization component 5 is easy and quick to install and remove.

[0100] The working end of the sterilization component 5 is inserted into the air supply channel 110 after passing through the heat insulation plate 13, which is beneficial for the sterilization component 5 to directly sterilize the air in the air supply channel 110. The installation end of the sterilization component 5 is set in the installation chamber 120. The sterilization component 5 is placed in the installation chamber 120 with a lower temperature, which is beneficial for extending the service life of the sterilization component 5. The installation end of the sterilization component 5 is fastened to the heat insulation plate 13. The installation method of the sterilization component 5 is simple and the disassembly and assembly efficiency is high.

[0101] In some embodiments, the mounting end of the sterilization component 5 and the impeller motor 3 are located in the same mounting chamber 120, which facilitates the connection of wires to supply power to the sterilization component 5 and the impeller motor 3.

[0102] In some embodiments, the sterilization component 5 is a negative ion generator; in other embodiments, the sterilization component 5 may also employ an ultraviolet sterilization structure.

[0103] In some embodiments, such as Figure 1 , Figures 9 to 12 As shown, the air supply housing 1 includes a first air outlet wall 121 and a second air outlet wall 122 that form an air outlet 140 and are arranged opposite to each other. One end of the heating component 4 is snapped into the second air outlet wall 122, and the other end of the heating component 4 is connected to the first air outlet wall 121 by fasteners.

[0104] Specifically, the first air outlet wall 121 is provided with a first limiting protrusion 1211. When the heating component 4 is engaged with the second air outlet wall 122, the heating component 4 can rotate relative to the air supply housing 1 to abut against the first limiting protrusion 1211. The first limiting protrusion 1211 plays a role in positioning the heating component 4, which facilitates the subsequent connection of the heating component 4 to the first air outlet wall 121 using fasteners.

[0105] For example, the second air outlet wall 122 is disposed above the first air outlet wall 121, the air outlet 140 is disposed on the outer cover 12, the second air outlet wall is provided with a locking hole 1221, the top of the heating component 4 is provided with a locking protrusion 411, and multiple locking holes 1221 are provided, which are spaced apart along the axial direction of the impeller shaft 22. The locking protrusion 411 corresponds to the locking hole 1221 one by one. The bottom of the heating component 4 is provided with a second limiting protrusion 412. When the locking protrusion 411 is inserted into the locking hole 1221, the heating component 4 can rotate relative to the air supply housing 1 so that the second limiting protrusion 412 abuts against the first limiting protrusion 1211.

[0106] In other embodiments, the protrusion may be disposed on the second air outlet wall, and the hole may be disposed on the heating component; the second air outlet wall may also be disposed below the first air outlet wall.

[0107] The process of installing the heating component 4 into the outer cover 12 is as follows: Insert the heating component 4 into the air outlet 140 and insert the locking protrusion 411 into the locking hole 1221. Then rotate the heating component 4 towards the air outlet 140 until the second limiting protrusion 412 abuts against the first limiting protrusion 1211. Finally, fasten the bottom of the heating component 4 to the first air outlet wall 121. The heating component 4 is easy to install and remove, and the heating component 4 has high stability, which helps to reduce the noise during the operation of the air supply structure.

[0108] In some embodiments, such as Figure 1 , Figures 9 to 11 As shown, the heating assembly 4 includes a heating grille 41 and a heating unit 42. The heating grille 41 has a mounting slot 414, the outlet direction of which faces away from the air outlet direction of the air outlet 140. The heating unit 42 is placed in the mounting slot 414 and can be installed on the heating grille 41. By setting the heating grille 41, the temperature uniformity of the air outlet can be improved. Exemplarily, the heating unit 42 is connected to the heating grille 41 by a plurality of heating fasteners, which are spaced apart along the axial direction of the impeller shaft 22.

[0109] In some embodiments, such as Figure 1 , Figures 9 to 11As shown, the heating assembly 4 also includes a thermostat 43, which is installed on the heating grille 41 with one end extending into the mounting chamber 120, and the other end inserted into the heating grille 41 and electrically connected to the heating unit 42. The thermostat 43 is used to control the start and stop of the heating unit 42. For example, the heating unit 42 is a PTC heater.

[0110] Specifically, the top of the heating grille 41 is provided with a temperature control mounting hole 413, and the lower end of the temperature controller 43 passes through the temperature control mounting hole 413 and is electrically connected to the heating unit 42. The temperature controller 43 is connected to the heating grille 41 by two temperature control fasteners distributed at 180°.

[0111] By extending the upper end of the thermostat 43 through the second air outlet wall 122 and into the installation chamber 120, the thermostat 43 is kept in a low-temperature environment, which protects it, extends its service life, and facilitates connection to the power supply. The thermostat 43 is then securely connected to the heating grille 41. The installation of the thermostat 43 is simple, and disassembly and assembly are quick and easy.

[0112] In some embodiments, such as Figure 1 , Figure 2 , Figure 7 and Figure 13 As shown, a waterproof sleeve 126 is provided inside the air supply channel 110. The waterproof sleeve 126 is located between the heating component 4 and the air inlet 130. The waterproof sleeve 126 passes through the air supply housing 1 and is used for the passage of pipelines.

[0113] Specifically, the inner bottom wall of the outer cover 12 is provided with a waterproof sleeve 126. The waterproof sleeve 126 has a through hole 1261 that is arranged vertically. The lower end of the through hole 1261 extends to the outer bottom wall of the outer cover 12. The waterproof sleeve 126 is sealed to the upper cover 11. The upper cover 11 is provided with a through hole 116 that corresponds to the through hole 1261. The through hole 1261 and the corresponding through hole 116 are connected to form a through channel.

[0114] The electric water heater also includes an inner tank 92, a cold water inlet pipe and a hot water outlet pipe. Both the cold water inlet pipe and the hot water outlet pipe are connected to water pipe joints 95. The two water pipe joints 95 are respectively connected to the water inlet and the water outlet of the inner tank 92. Each of the two water pipe joints 95 is equipped with a waterproof sleeve 126. The water pipe joints 95 are inserted into the corresponding pipe passage to reduce the possibility of water entering the air supply passage 110 due to water leakage from the water pipe joints 95, thereby improving the waterproof performance.

[0115] For example, the upper end of the waterproof sleeve 126 abuts against the inner wall of the upper cover 11 and forms a surface contact seal, which can seal the contact position between the waterproof sleeve 126 and the upper cover 11.

[0116] For example, the waterproof sleeve 126 and the outer cover 12 are integrally formed, which can improve the sealing effect between the waterproof sleeve 126 and the outer cover 12, simplify the processing of the outer cover 12 and the waterproof sleeve 126, reduce processing costs, and simplify assembly.

[0117] In some embodiments, such as Figure 1 and Figure 8 As shown, the air supply structure also includes a swing plate 71, two swing motors 73 and two rotating rods 72. The two swing motors 73 are respectively installed in two installation chambers 120 and are arranged in a one-to-one correspondence with the two rotating rods 72. One end of the rotating rod 72 is connected to the output shaft of the corresponding swing motor 73, and the other end of the rotating rod 72 is rotatably circumferentially inserted through the outer cover 12 around the output shaft of the corresponding swing motor 73 and then connected to the corresponding swing plate 71. The swing motor 73 drives the rotating rod 72 to drive the swing plate 71 to rotate to open and close the air outlet 140.

[0118] Two swing motors 73 are arranged at each end of the swing plate 71 along its length. The two swing motors 73 are controlled to operate synchronously to drive the swing plate 71 to rotate. The forces at both ends of the swing plate 71 along its length are balanced, which can improve the stability of the swing plate 71 during rotation. It can also make the swing plate 71 fit more tightly with the outer cover 12, achieving seamless closure of the air outlet 140. Setting the swing motors 73 in the installation chamber 120 not only improves the aesthetics of the air supply structure, but also allows the swing motors 73 to be in a lower temperature environment, which helps to reduce the high temperature resistance requirements of the swing motors 73 and reduce costs, and also helps to extend the service life of the swing motors 73.

[0119] In some embodiments, for ease of description, the mounting chamber 120 where the wind turbine motor 3 is located is referred to as the first mounting chamber, and the other mounting chamber 120 is referred to as the second mounting chamber. A wiring channel is formed between the upper cover 11 and the second air outlet wall 122. The swing motor 73 arranged in the second mounting chamber is connected to a first wire, which passes through the wiring channel and then enters the first mounting chamber. The swing motor 73 arranged in the first mounting chamber is connected to a second wire, and the introduction of the first wire into the first mounting chamber facilitates the connection of the first wire and the second wire to a power source.

[0120] Specifically, the second air outlet wall 122 includes a plate body 1222, two sealing plates 1223 protruding from the top surface of the plate body 1222, and at least two wiring plates 1224. The two sealing plates 1223 are spaced apart along the width direction of the outer cover 12, and the two wiring plates 1224 are spaced apart along the length direction of the outer cover 12. The two sealing plates 1223 are connected by the two wiring plates 1224. A wiring hole 1225 is formed between the wiring plate 1224 and one of the sealing plates 1223, and the wiring holes 1225 on the plurality of wiring plates 1224 are connected sequentially to form a wiring channel. It should be noted that the width direction of the outer cover 12 is the front-to-back direction.

[0121] In some embodiments, such as Figure 9 As shown, the inner wall of the upper cover 11 is provided with a third sealing surface 114. The second air outlet wall 122 abuts against the third sealing surface 114 along the width direction of the outer cover 12 and forms a surface contact seal, so that the wiring channel and the air outlet channel are not connected. Specifically, the side of the rear sealing plate 1223 facing away from the other sealing plate 1223 forms the third sealing surface 114. This arrangement can prevent air leakage at the contact position between the second air outlet wall 122 and the upper cover 11, ensuring the sealing performance of the air supply channel 110; and it can also separate the wiring channel and the air supply channel 110 to prevent hot air in the air outlet channel from entering the wiring channel, so that the first wire passing through the wiring channel is in a lower temperature environment.

[0122] For example, in the two sealing plates 1223, the positioning protrusion 123 is formed on the upper end of the sealing plate 1223 located in front.

[0123] In some embodiments, the oscillating motor 73 is a stepper motor, which can control the rotation angle of the output shaft of the oscillating motor 73 according to actual needs, so as to adjust the opening angle of the oscillating plate 71 to meet the adjustment of the air outlet direction. The oscillating motor 73 can also be controlled to drive the oscillating plate 71 to swing back and forth to achieve a comfortable air outlet effect; the speed of the oscillation of the oscillating plate 71 can also be controlled to adjust the air outlet effect.

[0124] For example, the sway plate 71 is rotated 90° from the position where the air outlet 140 is fully open to the position where the air outlet 140 is fully closed.

[0125] In some embodiments, such as Figure 1As shown, the outer casing 12 also includes a front wall 125 connecting the second air outlet wall 122 and the first air outlet wall 121. The front wall 125 has a forward-facing receiving groove 1251. An air outlet 140 penetrates the bottom wall of the receiving groove 1251. The receiving groove 1251 extends along the length of the front wall 125. The bottom wall of the receiving groove 1251 also has two clearance holes 1252. The air outlet 140 is positioned between the two clearance holes 1252 along the length of the front wall 125. Each clearance hole 1252 corresponds to one of two rotating rods 72, and the rotating rods 72 pass through the corresponding clearance holes 1252. For example, the front wall 125 is located on the front side of the electric water heater.

[0126] When the air outlet 140 is closed by the oscillating plate 71, the oscillating plate 71 is contained in the receiving groove 1251 and does not protrude from the outer surface of the front wall 125, which can improve the aesthetic performance of the air supply structure.

[0127] For example, the oscillating plate 71 has an arc-shaped structure. In order to improve the structural strength of the oscillating plate 71, a reinforcing strip is provided on the inner wall surface of the oscillating plate 71. The reinforcing strip is provided on the inner wall surface of the oscillating plate 71, which can improve the aesthetic performance of the oscillating plate 71 and avoid the reinforcing strip being directly exposed, thus affecting the aesthetics of the heating device.

[0128] In some embodiments, such as Figure 3 As shown, the air inlet 130 and the air outlet 140 are located on opposite radial sides of the cross-flow impeller 2, in other words, the air inlet 130 and the air outlet 140 are arranged approximately 180° apart. Compared to the prior art where the air inlet 130 and the air outlet 140 are arranged at a 90° interval, this arrangement helps to reduce the volume of the air supply structure and the space occupied by the air supply structure. For example, the air inlet 130 is closer to the cross-flow impeller 2 than the air outlet 140.

[0129] In some embodiments, such as Figure 3 and Figure 9 As shown, the upper inner wall of the air supply channel 110 is formed with a first volute guide wall 1103 and a second volute guide wall 1104, both extending circumferentially along the cross-flow impeller 2. The first volute guide wall 1103 and the second volute guide wall 1104 are arranged sequentially along the rotation direction of the cross-flow impeller 2. The first volute guide wall 1103 is located on the side of the second volute guide wall 1104 near the air inlet 130. The first volute guide wall 1103 is an arc surface with a distance of R1 from the central axis of the cross-flow impeller 2, and the distance between the second volute guide wall 1104 and the central axis of the cross-flow impeller 2 is R2, where R1 < R2. R2 gradually increases from the air outlet 140 to the air inlet 130. Exemplarily, the first volute guide wall 1103 and the second volute guide wall 1104 are both provided on the inner wall of the upper cover 11. Figure 3 and Figure 9The direction indicated by W in the middle is the rotation direction of the cross-flow wind turbine 2.

[0130] For ease of description, the gap between the first volute guide wall 1103 and the cross-flow impeller 2 is referred to as the first gap 1105, and the gap between the second volute guide wall 1104 and the cross-flow impeller 2 is referred to as the second gap 1106.

[0131] like Figure 3 and Figure 9 As shown, the cross-flow impeller 2 rotates, and outside air enters through the air inlet 130 under the action of the cross-flow impeller 2, and flows to the left through the gap between the cross-flow impeller 2 and the lower inner wall of the air supply channel 110. Most of the airflow on the outlet side of the cross-flow impeller 2 flows directly to the outlet 140, and the remaining small part of the airflow flows to the narrower end of the second gap 1106 under the action of the cross-flow impeller 2. Since the gap between the narrower end of the second gap 1106 and the cross-flow impeller 2 is small, the second volute guide wall 1104 has a flow obstruction effect. From the outlet 140 to the air inlet 130, R2 gradually increases, and correspondingly, the second gap 1106 gradually increases. Part of the airflow on the outlet side of the cross-flow impeller 2 enters the second gap 1106 from the narrower end of the second gap 1106. Within 06, as the second gap 1106 gradually increases, the airflow pressure gradually decreases, which helps to reduce the noise generated by the friction between the airflow and the inner wall of the second gap 1106. Then, the airflow hits the obstruction surface formed by the first volute tongue guide wall 1103 and the second volute tongue guide wall 1104, causing the airflow to flow in reverse and dissipate in the narrower part of the second gap 1106. Since R1 < R2 and the first volute tongue guide wall 1103 and the second volute tongue guide wall 1104 at the wider end of the second gap 1106 are connected, the difference between R1 and R2 is large. The obstruction effect at the junction of the first volute tongue guide wall 1103 and the second volute tongue guide wall 1104 is strong. The remaining small amount of airflow flows to the air inlet 130 under the action of the first volute tongue guide wall 1103.

[0132] In some embodiments, the direction of extension of the first volute guide wall 1103 from one end to the other end of the second volute guide wall 1104 is the rotation direction of the cross-flow impeller 2; the cross-flow impeller 2 includes a plurality of blades 21 arranged circumferentially around the impeller shaft 22, and the two ends of the blades 21 respectively form a proximal end 221 and a distal end 222, with the proximal end 221 being closer to the impeller shaft 22 than the distal end 222.

[0133] In any two adjacent blades 21 distributed along the rotation direction of the cross-flow wind turbine 2, the proximal end 221 of the downstream blade 21 is located between the proximal end 221 and the distal end 222 of the upstream blade 21. In other words, the proximal end 221 and the distal end 222 are alternately distributed along the circumference of the cross-flow wind turbine 2.

[0134] like Figure 3As shown, the cross-flow fan 2 rotates clockwise. Outside air enters the gap between the cross-flow fan 2 and the lower inner wall of the air supply channel 110 through the air inlet 130, and then flows to the side of the cross-flow fan 2 near the air outlet 140.

[0135] In some embodiments, such as Figure 9 As shown, the radial gap between the first volute guide wall 1103 and the maximum outer diameter of the cross-flow impeller 2 is d1, where d1 ≤ 3 mm. By limiting the radial gap d1 ≤ 3 mm, it is beneficial to reduce the airflow entering the second gap 1106, so that most of the airflow in the first gap 1105 is blocked by the obstructing surface and flows in the opposite direction, and then gradually dissipates.

[0136] It should be noted that d1 can be any of 3mm, 2.5mm, 2mm, 1.5mm, or 1mm.

[0137] In some embodiments, such as Figure 9 As shown, the minimum radial clearance between the second volute guide wall 1104 and the maximum outer diameter of the cross-flow impeller 2 is dmin, and the maximum radial clearance between the second volute guide wall 1104 and the maximum outer diameter of the cross-flow impeller 2 is dmax; the ratio of dmax to dmin is less than or equal to 1.5. By limiting the ratio of dmax to dmin, it is beneficial to control the airflow direction and reduce the noise generated by friction between the airflow and the inner wall of the second slit 1106.

[0138] It should be noted that the ratio of dmax to dmin can be any value greater than 1 and less than or equal to 1.5. For example, dmax:dmin = 13:11.

[0139] In some embodiments, such as Figure 9 As shown, the arc length of the first volute guide wall 1103 extending circumferentially along the cross-flow impeller 2 is L1, and the arc length of the second volute guide wall 1104 extending circumferentially along the cross-flow impeller 2 is L2. L1 > L2, and the ratio of L1 to L2 is less than or equal to 1.2.

[0140] By limiting the ratio of L1 to L2, it is beneficial to control the airflow direction and reduce noise.

[0141] It should be noted that the ratio of dmax to dmin can be any value greater than 1 and less than or equal to 1.2. For example, dmax:dmin = 67:57.

[0142] In some embodiments, such as Figure 3 As shown, the air outlet channel includes a first air outlet 1101, and the cross-sectional area of ​​the first air outlet 1101 gradually decreases along the air outlet direction of the first air outlet 1101.

[0143] With this configuration, the compressed airflow generated by the cross-flow fan 2 is compressed twice as it flows from the inlet end of the first air outlet 1101 to the outlet end of the first air outlet 1101, increasing the outlet pressure of the air outlet 140 and thus increasing the air volume.

[0144] In some embodiments, such as Figure 3 As shown, the air outlet channel also includes a second air outlet channel 1102 connected to the first air outlet channel 1101. Along the extension direction of the air outlet channel, the first air outlet channel 1101 is closer to the cross-flow impeller 2 than the second air outlet channel 1102. Along the air outlet direction of the second air outlet channel 1102, the cross-sectional area of ​​the second air outlet channel 1102 gradually increases.

[0145] The compressed airflow, which is compressed twice by the first air outlet 1101, enters the second air outlet 1102 and radiates to a larger area, which helps to disperse the airflow and increase the air outlet area; moreover, the second air outlet 1102 also has the function of guiding the airflow.

[0146] For example, the air outlet channel formed by connecting the first air outlet 1101 and the second air outlet 1102 is a funnel-shaped channel with large openings at both ends and a narrow middle.

[0147] In some embodiments, such as Figure 9 As shown, an air outlet guide wall 1109 is provided on the lower inner wall of the air supply channel 110 at the position corresponding to the cross-flow impeller 2. From the cross-flow impeller 2 to the air outlet 140, the radial distance between the air outlet guide wall 1109 and the cross-flow impeller 2 gradually increases. The airflow generated by the rotation of the cross-flow impeller 2 flows towards the side where the air outlet 140 is located under the guiding effect of the air outlet guide wall 1109. Since the radial distance between the air outlet guide wall 1109 and the cross-flow impeller 2 gradually increases from the cross-flow impeller 2 to the air outlet 140, the air outlet guide wall 1109 can guide most of the airflow to the air outlet 140, thereby obtaining a larger air volume, and the airflow guided to the second volute tongue guide wall 1104 by the cross-flow impeller 2 is relatively small, which is beneficial to reducing noise.

[0148] It should be noted that the radial distance between the outlet guide wall 1109 and the cross-flow impeller 2 refers to the radial distance between the maximum outer circle of the cross-flow impeller 2 and the outlet guide wall 1109. The lower inner wall of the air supply channel 110 has a volute, which refers to the point where the radial distance between the lower inner wall of the air supply channel 110 and the cross-flow impeller 2 is the smallest. In the direction from the air inlet 130 to the air outlet 140, the outlet guide wall 1109 is located downstream of the volute, and the end of the outlet guide wall 1109 closest to the cross-flow impeller 2 is connected to the volute.

[0149] In some embodiments, such as Figure 9As shown, an air inlet guide wall 1108 is provided on the lower inner wall of the air supply channel 110 at the position corresponding to the cross-flow impeller 2. From the air inlet 130 to the cross-flow impeller 2, the radial distance between the air inlet guide wall 1108 and the cross-flow impeller 2 gradually decreases, so that as much airflow as possible can enter the gap between the cross-flow impeller 2 and the lower inner wall of the air supply channel 110.

[0150] It should be noted that the radial distance between the air inlet guide wall 1108 and the cross-flow impeller 2 refers to the radial distance between the maximum outer circle of the cross-flow impeller 2 and the cross-flow impeller 2. In the direction from the air inlet 130 to the air outlet 140, the air inlet guide wall 1108 is located upstream of the volute throat, and the end of the air inlet guide wall 1108 closest to the cross-flow impeller 2 is connected to the volute throat.

[0151] In some embodiments, such as Figure 3 As shown, the air inlet 130 is equipped with an air inlet grille 8, and the outlet of the air inlet grille 8 is higher than the inlet of the air inlet grille 8. This arrangement can prevent external shower spray water from entering the air supply duct 110.

[0152] like Figure 14 As shown, simulation of the above air supply structure revealed that the noise at the air outlet 140 is less than 60 decibels, which is relatively low.

[0153] For example, the air intake grille 8 is integrally formed on the outer cover 12, which simplifies the processing of the outer cover 12 and the air intake grille 8 and reduces costs.

[0154] In some embodiments, such as Figure 13 and Figure 15 As shown, the electric water heater also includes a water heater housing 91, and the air supply structure is installed at the bottom of the water heater housing 91.

[0155] Specifically, the inner wall of the top cover 11 is provided with an annular groove 115 extending circumferentially therein, and the water heater shell 91 is provided with an annular rib, which is inserted upward into the annular groove 115 to connect the top cover 11 to the water heater shell 91.

[0156] In some embodiments, such as Figure 13 and Figure 15 As shown, the bottom of the inner liner 92 is connected to a drain pipe 93, and the upper cover 11 is provided with a perforation. The lower end of the drain pipe 93 passes through the perforation and extends into the air supply channel 110 and is connected to a detachable first drain cover 18. The outer cover 12 is provided with a drain hole, and the drain hole is connected to a detachable second drain cover 94. The first projection of the perforation in the horizontal plane is completely located within the second projection of the drain hole in the horizontal plane, and the first projection and the second projection are spaced apart.

[0157] When it is necessary to drain the water heater, remove the second drain cover 94, and then remove the first drain cover 18. The dirt inside the inner tank 92 will be drained through the drain pipe 93 and the drain hole in sequence. Because the first and second projections are set at an interval, the dirt discharged through the drain pipe 93 can pass smoothly through the drain hole and is less likely to splash into the air supply channel 110.

[0158] For example, the first drain cover 18 and the drain pipe 93 are threaded together, and the second drain cover 94 and the outer cover 12 are fastened together, making disassembly and assembly convenient and quick.

[0159] It should be noted that, in the embodiments of the present invention, the inner wall of the upper cover 11 refers to the wall surface of the upper cover 11 facing downwards.

[0160] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0161] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An air supply structure, characterized in that, include: An air supply housing (1) has a first support structure (14) and a second support structure (15) that are axially spaced on the inner bottom wall of the air supply housing (1). The first support structure (14) is connected to a motor cover plate (17) located above it, and the second support structure (15) is connected to a wind turbine cover plate (16) located above it. A cross-flow wind turbine (2) is provided with a rotating component (6) connected to one end of the cross-flow wind turbine (2). The rotating component (6) is sandwiched between the wind turbine cover plate (16) and the second support structure (15) along both the radial and axial directions of the cross-flow wind turbine (2). The wind turbine motor (3) is coaxially arranged with the cross-flow wind turbine (2). The output shaft of the wind turbine motor (3) is connected to the other end of the cross-flow wind turbine (2) to drive the cross-flow wind turbine (2) to rotate. The wind turbine motor (3) is sandwiched between the motor cover plate (17) and the first support structure (14) along the radial and axial directions of the cross-flow wind turbine (2).

2. The air supply structure according to claim 1, characterized in that, The air supply housing (1) has an air supply channel (110), and an air inlet (130) and an air outlet (140) are formed at both ends of the air supply channel (110). The upper inner wall of the air supply channel (110) is formed with a first volute tongue guide wall (1103) and a second volute tongue guide wall (1104) that both extend circumferentially along the cross-flow impeller (2). The first volute tongue guide wall (1103) is located on the side of the second volute tongue guide wall (1104) closer to the air inlet (130). The first volute guide wall (1103) is an arc surface with a distance of R1 from the central axis of the cross-flow impeller (2). The distance between the second volute guide wall (1104) and the central axis of the cross-flow impeller (2) is R2, where R1 < R2. R2 gradually increases from the air outlet (140) to the air inlet (130).

3. The air supply structure according to claim 2, characterized in that, The direction of extension of the first volute tongue guide wall (1103) from one end to the other end where it connects to the second volute tongue guide wall (1104) is the rotation direction of the cross-flow impeller (2); The cross-flow wind turbine (2) includes a wind turbine shaft (22) and a plurality of blades (21) arranged circumferentially around the wind turbine shaft (22). The two ends of the blades (21) are respectively formed into a proximal end (221) and a distal end (222), and the proximal end (221) is closer to the wind turbine shaft (22) than the distal end (222). In any two adjacent blades (21) distributed along the rotation direction of the cross-flow impeller (2), the proximal end (221) of the downstream blade (21) is located between the proximal end (221) of the upstream blade (21) and the distal end (222) of the upstream blade (21).

4. The air supply structure according to claim 2, characterized in that, The minimum radial clearance between the second volute guide wall (1104) and the maximum outer diameter of the cross-flow impeller (2) is dmin, and the maximum radial clearance between the second volute guide wall (1104) and the maximum outer diameter of the cross-flow impeller (2) is dmax; the ratio of dmax to dmin is less than or equal to 1.

5.

5. The air supply structure according to claim 2, characterized in that, The air supply channel (110) is provided with a heating component (4). From the air inlet (130) to the air outlet (140), the heating component (4) is located downstream of the cross-flow fan (2). The air supply channel (110) located upstream of the cross-flow fan (2) forms an air inlet channel (1107), and the air supply channel (110) located downstream of the cross-flow fan (2) forms an air outlet channel. The air supply housing (1) is provided with two heat insulation plates (13) spaced apart along the axial direction of the cross-flow impeller (2). The two heat insulation plates (13) divide the inner cavity of the air supply housing (1) into two installation chambers (120) that are directly connected to the outside atmosphere, and the air supply channel (110) located between the two installation chambers (120). Both installation chambers (120) are connected to the air inlet channel (1107). The first support structure (14) is disposed in one of the mounting chambers (120), and the second support structure (15) is disposed in the other mounting chamber (120).

6. The air supply structure according to claim 5, characterized in that, The air supply channel (110) is provided with a waterproof sleeve (126), which is located between the heating component (4) and the air inlet (130) and penetrates the air supply housing (1). The waterproof sleeve (126) is used for the passage of pipelines.

7. The air supply structure according to claim 5, characterized in that, The air supply structure also includes a sterilization component (5). The installation end of the sterilization component (5) is disposed in the installation chamber (120) and installed on the heat insulation plate (13) forming the installation chamber (120). The working end of the sterilization component (5) passes through the heat insulation plate (13) and is placed in the air supply channel (110). The sterilization component (5) is used to sterilize the airflow flowing in the air supply channel (110).

8. The air supply structure according to claim 5, characterized in that, The air supply housing (1) includes a first air outlet wall (121) and a second air outlet wall (122) that surround the air outlet (140) and are disposed opposite to each other; One end of the heating component (4) is snapped into the second air outlet wall (122), and the other end of the heating component (4) is connected to the first air outlet wall (121) by fasteners.

9. The air supply structure according to claim 8, characterized in that, The heating component (4) includes: A heating grille (41) has a mounting slot (414) with the outlet direction of the mounting slot (414) facing away from the air outlet (140) outlet direction. Heating unit (42), the heating unit (42) is located in the mounting slot (414) and installed on the heating grid (41); Thermostat (43) is installed on the heating grille (41) with one end extending into the mounting chamber (120) and the other end inserted into the heating grille (41) and electrically connected to the heating unit (42). The thermostat (43) is used to control the start and stop of the heating unit (42).

10. An electric water heater, characterized in that, It includes a water heater housing (91) and an air supply structure as described in any one of claims 1 to 9, the air supply structure being installed at the bottom of the water heater housing (91).

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