Foaming device and electric water heater

Abstract

The utility model relates to the technical field of electric water heaters, and discloses a bubbling device and an electric water heater. The bubbling device comprises a shell, an electricity-proof wall unit and a bubbling unit, the electricity-proof wall unit and the bubbling unit communicate with each other, a main water outlet is formed in one end of the shell, and a mounting cavity communicating with the main water outlet is further formed in the shell; the electricity-proof wall unit and the bubbling unit are both arranged in the mounting cavity, the electricity-proof wall unit is arranged on the upstream of the bubbling unit, and a bubbling water outlet of the bubbling unit is communicated with the main water outlet. The electric leakage problem of the bubbling device can be effectively solved, bubbling can be achieved, and meanwhile a certain anti-electricity function is achieved; meanwhile, the integration level is higher, and water flow leakage can be prevented; in addition, the bubbling device is applicable to more scenes.

Description

Technical Field

[0001] This utility model relates to the field of electric water heater technology, and in particular to an aerator and an electric water heater. Background Technology

[0002] Existing electric water heater technology has achieved relatively complete and comprehensive development in terms of comfort, intelligence, and safety. Through continuous exploration, functional technologies are gradually being applied to bathing. Sparkling water is one such example. Compared to ordinary electric water heaters, those with nano-sparkling water functionality can better clean skin, clothing, and fruits and vegetables. The working principle of the aerator is that the sparkling water effectively reduces impurities by bursting and adsorbing bubbles, providing users with a better bathing experience.

[0003] However, electric water heaters with a bubble water function are prone to leakage during use, and the resulting leakage current can cause harm to the human body.

[0004] Therefore, there is an urgent need for an aerator and an electric water heater to solve the above problems. Utility Model Content

[0005] One of the technical problems solved by this utility model is to provide a foaming device that can effectively solve the problem of leakage in foaming devices, and while achieving foaming, it also has a certain anti-electric shock function.

[0006] The second technical problem solved by this utility model is to provide an electric water heater that can effectively solve the problems of limited functions and poor safety of electric water heaters, and has a bubble water function while being safer.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A foaming device, comprising:

[0009] The outer casing has a main water outlet at one end, and an installation cavity communicating with the main water outlet is also provided inside the outer casing;

[0010] The anti-electric shock wall unit and the aeration unit are interconnected and are both located in the installation cavity. The anti-electric shock wall unit is located upstream of the aeration unit, and the aeration outlet of the aeration unit is connected to the main outlet.

[0011] The foaming device described in this utility model has the following advantages compared with the prior art:

[0012] This invention integrates an anti-electric shock unit and a foaming unit within a housing. The foaming unit generates sparkling water, while the anti-electric shock unit provides a certain degree of protection against electric shock. This means the foaming device not only meets users' needs for sparkling water but also enhances its safety. Furthermore, both the anti-electric shock unit and the foaming unit are housed within the mounting cavity of the housing, which improves the integration and reduces the size of the foaming device, while also preventing leakage and ensuring its proper functioning. Additionally, the anti-electric shock unit and the foaming unit are detachable from the mounting cavity, allowing for the selection of different parameters to suit various applications and broadening the applicability of the foaming device.

[0013] In one embodiment, the anti-electric shock wall unit includes an inner tube and a sleeve. One end of the inner tube is provided with an anti-electric shock wall water inlet, and the other end is inserted into the sleeve. The end of the sleeve away from the anti-electric shock wall water inlet is set as a closed end. A first flow channel is provided between the sleeve and the inner wall of the outer shell. A second flow channel communicating with the anti-electric shock wall water inlet is provided inside the inner tube. A third flow channel is provided between the outer wall of the inner tube and the inner wall of the sleeve. One end of the third flow channel is connected to the second flow channel, and the other end is connected to the first flow channel. The first flow channel is connected to the foaming water inlet of the foaming unit. A guide surface is provided at the connection position between the second flow channel and the third flow channel, and / or at the connection position between the third flow channel and the first flow channel.

[0014] In one embodiment, the inner tube is provided with a mounting flange, which is located circumferentially to the inlet of the anti-electric wall and is sealed to the inner wall of the mounting cavity. The mounting flange has a first arc surface on the side facing the closed end.

[0015] In one embodiment, the outer wall of the sleeve is provided with three or more ribs along the circumferential direction, the ribs extend along the axial direction of the sleeve, and the outer wall of the ribs abuts against the inner wall of the outer shell.

[0016] And / or, the inner wall of the sleeve is provided with three or more protrusions along the circumferential direction, the protrusions extend along the axial direction of the sleeve, and the protrusions abut against the outer wall of the inner tube.

[0017] In one embodiment, the open end of the sleeve is provided with a plurality of abutment blocks, which are spaced apart circumferentially and fit against the first arc surface.

[0018] In one embodiment, the mounting flange is interference-fitted with the inner wall of the mounting cavity, or a sealing ring is provided between the mounting flange and the inner wall of the mounting cavity.

[0019] In one embodiment, a second arc surface is provided between the inner wall and the side wall of the closed end of the sleeve, and a third arc surface is provided at the end of the inner tube away from the water inlet.

[0020] In one embodiment, the inner wall of the closed end of the sleeve is provided with a diversion protrusion, the diversion protrusion is coaxially arranged with the second flow channel, the diversion protrusion is conical, and the smaller end of the diversion protrusion faces the water inlet of the anti-electric wall.

[0021] In one embodiment, the inner wall of the closed end of the sleeve is provided with a second arc surface, the two sides of the second arc surface are respectively connected to the diversion protrusion and the side wall of the sleeve, the second arc surface serves as the flow guiding surface, and the second arc surface is recessed in the direction away from the water inlet of the anti-electric wall.

[0022] In one embodiment, the aerating unit includes a venturi tube and a hydrocyclone disposed downstream of and connected to the venturi tube; an abutment platform is provided at one end of the mounting cavity near the main outlet, and the end of the hydrocyclone away from the venturi tube abuts against the abutment platform.

[0023] The second technical problem mentioned above is solved by the following technical solution:

[0024] An electric water heater includes an aerator as described in any of the above embodiments.

[0025] Compared with the prior art, the electric water heater described in this utility model has the following beneficial effects:

[0026] The electric water heater of this utility model is equipped with the aforementioned aeration device, which not only provides bubbly water but also has a certain anti-electric shock function; at the same time, it has a higher degree of integration, is easier to assemble, and improves the market competitiveness of the electric water heater. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional view of the foaming device provided in a specific embodiment of this utility model.

[0029] Figure 2 This is a cross-sectional view of the inner tube and sleeve of the anti-electric shock wall unit of the bubbling device provided in a specific embodiment of this utility model.

[0030] Figure 3 This is a schematic diagram of the sleeve of the foaming device provided in a specific embodiment of this utility model.

[0031] Label Explanation:

[0032] 100. Outer casing; 110. Main outlet; 120. Abutment platform; 130. Flat groove; 140. External thread; 150. Flared section;

[0033] 200. Anti-electric shock wall unit;

[0034] 210. Inner pipe; 211. Second flow channel; 212. Third flow channel; 213. Anti-electric shock wall inlet; 214. Mounting flange; 215. First arc surface; 216. Third arc surface;

[0035] 220. Sleeve; 221. Rib; 222. Abutment block; 223. Support foot; 224. Second arc surface; 225. Diverter protrusion; 226. Protruding strip; 227. Fourth arc surface;

[0036] 300, Bubbling unit; 310, Venturi tube; 320, Hydrocyclone. Detailed Implementation

[0037] 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 skilled in the art without creative effort are within the scope of protection of this application.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] like Figures 1-3 As shown, this embodiment provides a foaming device, which includes a housing 100 and an anti-electric shock wall unit 200 and a foaming unit 300 that are interconnected. One end of the housing 100 is provided with a main water outlet 110, and the housing 100 is also provided with an installation cavity that communicates with the main water outlet 110. The anti-electric shock wall unit 200 and the foaming unit 300 are both disposed in the installation cavity. The anti-electric shock wall unit 200 is disposed upstream of the foaming unit 300, and the foaming outlet of the foaming unit 300 is connected to the main water outlet 110.

[0042] By integrating an anti-electric shock wall unit 200 and a foaming unit 300 within the housing 100, where the foaming unit 300 generates sparkling water and the anti-electric shock wall unit 200 provides the foaming device with a certain degree of anti-electric shock capability, the foaming device not only meets users' needs for sparkling water but also further enhances its safety. Furthermore, both the anti-electric shock wall unit 200 and the foaming unit 300 are housed within the mounting cavity of the housing 100, which improves the integration of the foaming device, reduces its size, and helps prevent water leakage, thus ensuring its normal operation. Additionally, the anti-electric shock wall unit 200 and the foaming unit 300 are detachably mounted within the mounting cavity, allowing for the selection of different parameters to suit various usage needs and broadening the applicability of the foaming device.

[0043] It is worth noting that the anti-electric shock unit 200 is located upstream of the foaming unit 300 to prevent the foamed water from passing through the anti-electric shock unit 200 and affecting the amount of bubbles.

[0044] Specifically, the bubble-generating unit 300 includes a Venturi tube 310 and a hydrocyclone 320 disposed downstream of and connected to the Venturi tube 310. The cross-sectional area of ​​the water flow in the middle section of the Venturi tube 310 narrows. According to the Venturi principle, increased flow velocity leads to decreased pressure, reducing the solubility of gas in water and causing it to detach from the water to form nanoscale bubbles. The faster the flow velocity, the better the bubble formation effect. The blades of the hydrocyclone 320 break up the bubbles, thus creating bubbly water at the main outlet 110 after the liquid flows through the bubble-generating unit 300.

[0045] Furthermore, the bubbling unit 300 is provided with a plurality of hydrocyclones 320, and the plurality of hydrocyclones 320 are arranged sequentially along the axial direction of the outer shell 100 to improve the effect of breaking up bubbles.

[0046] Preferably, in order to achieve connection and positioning between multiple hydrocyclones 320, a connection protrusion is provided at one axial end of the hydrocyclone 320 and a connection groove is provided at the other end. When two adjacent hydrocyclones 320 are installed, the connection protrusion of one hydrocyclone 320 can be placed in the connection groove of the other hydrocyclone 320, thereby improving the connection accuracy between multiple hydrocyclones 320.

[0047] Optionally, an abutment platform 120 is provided at one end of the mounting cavity near the main outlet 110, and the end of one of the multiple hydrocyclones 320 furthest from the Venturi tube 310 abuts against the abutment platform 120. Simultaneously, the Venturi tube 310 abuts against the end of one of the multiple hydrocyclones 320 furthest from the Venturi tube 310. A flared section 150 is provided between the aerating outlet and the main outlet 110, connecting the aerating outlet and the main outlet 110, and the inner diameter of the flared section 150 gradually decreases from the direction of the aerating outlet to the main outlet 110.

[0048] To improve the circumferential positioning of the hydrocyclone 320 within the housing 100, one of the inner wall of the housing 100 and the hydrocyclone 320 is provided with a positioning protrusion, and the other is provided with a positioning groove. When the hydrocyclone 320 is placed inside the housing 100, the mounting protrusion is correspondingly placed in the positioning groove to prevent the hydrocyclone 320 from rotating inside the housing 100.

[0049] In this embodiment, the outer casing 100 is cylindrical. To facilitate the installation and disassembly of the foaming device, a flat groove 130 is provided on the outer wall of the outer casing 100. Operators can use tools such as wrenches to engage with the flat groove 130 for clamping and tightening during installation and disassembly, thus enabling the installation and disassembly of the foaming device. Exemplarily, the installation structure includes two flat grooves 130 symmetrically arranged circumferentially on the outer wall of the outer casing 100, facilitating tool placement.

[0050] Optionally, there are multiple planar grooves 130, which are symmetrically arranged circumferentially along the outer wall of the housing 100. This improves the reliability of clamping between the tool and the outer wall of the housing 100. It is understood that two planar grooves 130 symmetrically arranged circumferentially on the outer wall of the housing 100 form a group for simultaneous engagement with the tool. Multiple groups are arranged circumferentially on the outer wall of the housing 100 to facilitate engagement with the tool at different installation angles. Additionally, multiple groups are also arranged radially on the outer wall of the housing 100 for engagement with the tool at different installation positions, allowing the operator to select the appropriate two planar grooves 130 for clamping during installation and removal.

[0051] Furthermore, to facilitate the installation of the aerator, external threads 140 are provided on the outer wall of the main outlet 110 and the outer wall at the end away from the main outlet 110. By providing external threads 140, the aerator can be integrated as a separate component into the outer cover of the display panel, adapting to the diversified functional needs of electric water heaters. Making the aerator a movable module effectively saves space, facilitates the integration of multiple functions of the electric water heater, and improves aesthetics.

[0052] In one embodiment, the anti-electric shock wall unit 200 includes an inner tube 210 and a sleeve 220. One end of the inner tube 210 is provided with an anti-electric shock wall inlet 213, and the other end is inserted into the sleeve 220. The end of the sleeve 220 away from the anti-electric shock wall inlet 213 is set as a closed end. A first flow channel is provided between the sleeve 220 and the inner wall of the outer shell 100. A second flow channel 211 is provided inside the inner tube 210 and communicates with the anti-electric shock wall inlet 213. A third flow channel 212 is provided between the outer wall of the inner tube 210 and the inner wall of the sleeve 220. One end of the third flow channel 212 communicates with the second flow channel 211, and the other end communicates with the first flow channel. The first flow channel communicates with the foaming inlet of the foaming unit 300. Water flows through the aeration inlet into the anti-electric shock wall unit 200, and then flows through the second channel 211, the third channel 212 and the first channel in sequence, finally flowing out of the anti-electric shock wall unit 200 so that it can subsequently enter the aeration unit 300. The anti-electric shock wall unit 200 uses the tortuous water path formed by the second channel 211, the third channel 212 and the first channel to achieve a certain anti-electric shock effect, thereby protecting the safety of users.

[0053] Preferably, a guide surface is provided at the connection position between the second flow channel 211 and the third flow channel 212, and / or at the connection position between the third flow channel 212 and the first flow channel. By providing a guide surface at the water flow bend, the water flow can be guided, which helps to reduce the water flow resistance at the bend, thereby reducing the impact on the water output of the anti-electric shock wall unit 200. On the basis of achieving anti-electric shock, the amount of water entering the foaming unit 300 is increased.

[0054] Furthermore, the inner pipe 210 is provided with a mounting flange 214, which is located circumferentially to the aerator inlet and is sealed to the inner wall of the mounting cavity. This sealed connection effectively restricts water seepage at the joint between the inner pipe 210 and the outer casing 100, preventing leakage from weakening the anti-electric shock barrier effect. For example, the end of the mounting flange 214 facing the sealing end is provided with a first arc surface 215, which is recessed away from the main outlet 110. That is, the first arc surface 215 serves as a guide surface for guiding the flow at the connection point between the third flow channel 212 and the first flow channel.

[0055] Optionally, to achieve a sealed connection between the mounting flange 214 and the housing 100, the mounting flange 214 is interference-fitted with the inner wall of the mounting cavity, or a sealing ring is provided between the mounting flange 214 and the inner wall of the mounting cavity. Alternatively, to further improve the sealing effect, multiple sealing rings may be provided.

[0056] In this embodiment, the outer wall of the sleeve 220 is provided with three or more ribs 221 along the circumferential direction. The ribs 221 extend axially along the sleeve 220, and the outer side wall of the ribs 221 abuts against the inner wall of the mounting cavity to ensure radial positioning between the sleeve 220 and the outer shell 100. Further, one end of each rib 221 is provided with multiple abutment blocks 222, which are spaced apart circumferentially and fit against the first arc surface 215. It is understood that the shape of the abutment blocks 222 is adapted to the first arc surface 215 to ensure reliable abutment. And / or, the inner wall of the sleeve 220 is provided with three or more protrusions 226 along the circumferential direction. The protrusions 226 extend axially along the sleeve 220 and abut against the outer wall of the inner tube 210 to ensure radial positioning between the sleeve 220 and the inner tube 210. For example, the rib 221, the abutment block 222 and the rib 226 are all provided in a one-to-one correspondence.

[0057] Furthermore, a support foot 223 is provided at the other end of the rib 221. The support foot 223 abuts against one end of the vortex tube 310 of the foaming unit 300, providing a conductive space between the first flow channel and the foaming inlet. The rib 221, the spur 226, the abutment block 222, and the support foot 223 are integrally formed. In summary, by providing the rib 221, the spur 226, and the support foot 223 on the sleeve 220, the outer shell 100, the sleeve 220, the inner tube 210, and the foaming unit 300 are mutually positioned, and a gap is left between the outer shell 100, the sleeve 220, the inner tube 210, and the foaming unit 300 to form a channel for water flow.

[0058] Preferably, the outer shell 100, sleeve 220, inner tube 210 and aeration unit 300 are all coaxially arranged, which helps to ensure the uniformity of the circumferential width of the first flow channel and the third flow channel 212, thereby ensuring the uniformity of water flow.

[0059] In this embodiment, the inner wall of the closed end of the sleeve 220 is provided with a diversion protrusion 225. The diversion protrusion 225 is coaxially arranged with the second flow channel 211. By providing the diversion protrusion 225, the water in the second flow channel 211 is diverted, so that it flows evenly to various circumferential positions of the third flow channel 212. Preferably, the diversion protrusion 225 is conical, and the smaller end of the diversion protrusion 225 faces the inlet 213 of the anti-electric wall, thereby reducing water flow resistance while achieving diversion.

[0060] Specifically, a second arc surface 224 is provided between the inner wall and the side wall of the closed end of the sleeve 220. The two sides of the second arc surface 224 are respectively connected to the diversion protrusion 225 and the side wall of the sleeve 220. The second arc surface 224 serves as a flow guiding surface. The second arc surface 224 is recessed in the direction away from the water inlet 213 of the anti-electric wall, so that the water flow in the second flow channel 211 can enter the third flow channel 212 after being guided by the second arc surface 224 and the third arc surface 216, resulting in less flow resistance.

[0061] In one embodiment, the outer wall of the closed end of the sleeve 220 is provided with a fourth arc surface 227 to reduce the resistance of water flowing from the first flow channel to the foaming unit 300. Additionally, it provides guidance for the water flow from the first flow channel to the foaming unit 300. The end of the inner tube 210 away from the anti-electric wall inlet 213 is provided with a third arc surface 216 to reduce the resistance of water flowing from the second flow channel 211 to the third flow channel 212.

[0062] It is worth noting that the overlap length of the first flow channel, the second flow channel 211, and the third flow channel 212 is not less than 90% of the axial length of the anti-electric shock wall unit 200. This means the water flow path within the anti-electric shock wall unit 200 is Z-shaped, making the water flow path approximately three times the length of the anti-electric shock wall unit 200, effectively increasing the path length. Combined with the smaller water flow cross-sectional area of ​​the anti-electric shock wall inlet 213 of the anti-electric shock wall unit 200, this helps to increase the resistance through which the current flows. This, in turn, enhances the anti-electric shock effect of the aerator.

[0063] This embodiment also discloses an electric water heater, including the aeration device described in any of the above embodiments. The electric water heater with the aforementioned aeration device not only provides aerated water but also has a certain degree of anti-electric shock capability; at the same time, it has higher integration, is easier to assemble, and improves the market competitiveness of the electric water heater.

[0064] 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.

[0065] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A foaming device, characterized in that, include: The outer casing (100) has a main water outlet (110) at one end, and the inner part of the outer casing (100) is also provided with an installation cavity communicating with the main water outlet (110); The anti-electric shock wall unit (200) and the foaming unit (300) are interconnected and are both located in the installation cavity. The anti-electric shock wall unit (200) is located upstream of the foaming unit (300), and the foaming outlet of the foaming unit (300) is connected to the main outlet (110).

2. The foaming device according to claim 1, characterized in that, The anti-electric shock wall unit (200) includes an inner tube (210) and a sleeve (220). One end of the inner tube (210) is provided with an anti-electric shock wall inlet (213), and the other end is inserted into the sleeve (220). The end of the sleeve (220) away from the anti-electric shock wall inlet (213) is set as a closed end. A first flow channel is provided between the sleeve (220) and the inner wall of the outer shell (100). A second flow channel is provided inside the inner tube (210) and communicates with the anti-electric shock wall inlet (213). 211), a third flow channel (212) is provided between the outer wall of the inner tube (210) and the inner wall of the sleeve (220). One end of the third flow channel (212) is connected to the second flow channel (211), and the other end is connected to the first flow channel. The first flow channel is connected to the foaming inlet of the foaming unit (300). A guide surface is provided at the connection position between the second flow channel (211) and the third flow channel (212), and / or at the connection position between the third flow channel (212) and the first flow channel.

3. The foaming device according to claim 2, characterized in that, The inner tube (210) is provided with a mounting flange (214), which is located around the inlet (213) of the anti-electric wall and is sealed to the inner wall of the mounting cavity. The mounting flange (214) has a first arc surface (215) on the side facing the closed end.

4. The foaming device according to claim 2, characterized in that, The outer wall of the sleeve (220) is provided with three or more ribs (221) along the circumferential direction. The ribs (221) extend along the axial direction of the sleeve (220), and the outer wall of the ribs (221) abuts against the inner wall of the outer shell (100). And / or, the inner wall of the sleeve (220) is provided with three or more protrusions (226) in the circumferential direction, the protrusions (226) extend along the axial direction of the sleeve (220), and the protrusions (226) abut against the outer wall of the inner tube (210).

5. The foaming device according to claim 3, characterized in that, The sleeve (220) has a plurality of abutment blocks (222) at its open end. The plurality of abutment blocks (222) are spaced apart in the circumferential direction and are in contact with the first arc surface (215).

6. The foaming device according to claim 3, characterized in that, The mounting flange (214) is interference-fitted with the inner wall of the mounting cavity, or a sealing ring is provided between the mounting flange (214) and the inner wall of the mounting cavity.

7. The foaming device according to claim 2, characterized in that, The inner wall of the closed end of the sleeve (220) is provided with a diversion protrusion (225), which is coaxially arranged with the second flow channel (211). The diversion protrusion (225) is conical, and the smaller end of the diversion protrusion (225) faces the inlet (213) of the anti-electric wall.

8. The foaming device according to claim 7, characterized in that, The inner wall of the closed end of the sleeve (220) is provided with a second arc surface (224). The two sides of the second arc surface (224) are respectively connected to the diversion protrusion (225) and the side wall of the sleeve (220). The second arc surface (224) serves as the flow guiding surface. The second arc surface (224) is recessed in the direction away from the water inlet (213) of the anti-electric wall.

9. The foaming device according to any one of claims 1-8, characterized in that, The aeration unit (300) includes a venturi tube (310) and a hydrocyclone (320) disposed downstream of and connected to the venturi tube (310); an abutment platform (120) is provided at one end of the mounting cavity near the main outlet (110), and the end of the hydrocyclone (320) away from the venturi tube (310) abuts against the abutment platform (120).

10. An electric water heater, characterized in that, Includes the foaming device as described in any one of claims 1-9.

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