Instant small electric water heater

Abstract

The invention discloses an instant small electric water heater which comprises a shell, a water inlet pipe, a heating body, a water outlet pipe and an electricity guard wall. The water inlet pipe, the heating body, the water outlet pipe and the electricity-proof wall are connected in sequence; the water inlet pipe, the heating body and the water outlet pipe are mounted in the shell; and the electricity-proof wall is arranged in the shell. The electricity-proof wall is internally arranged, so that the attractiveness of the small kitchen water heater is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of small electric water heaters, and more particularly to an instantaneous small electric water heater. Background Technology

[0002] A mini water heater is a type of electric water heater. It is small in size and suitable for washing dishes and vegetables in the kitchen or washing hands in the bathroom. Mini water heaters are usually divided into storage type and instant type. Because storage type mini water heaters are larger in size and require a certain heating time compared to instant type mini water heaters, instant type mini water heaters are more popular.

[0003] To prevent electric leakage, small water heaters usually have an anti-electric shock wall. This anti-electric shock wall works by extending the water channel, thereby increasing the water resistance. When the voltage remains constant, the current is reduced accordingly, thus preventing leakage. However, the anti-electric shock wall is usually located on the outside of the small water heater, which greatly affects its aesthetics. Summary of the Invention

[0004] To improve the aesthetics of the small electric water heater, this invention provides an instantaneous small electric water heater.

[0005] The present invention provides an instantaneous small electric water heater using the following technical solution: An instantaneous small electric water heater includes a shell, an inlet pipe, a heating element, an outlet pipe, and an anti-electric shock wall; the inlet pipe, the heating element, the outlet pipe, and the anti-electric shock wall are connected in sequence; the inlet pipe, the heating element, and the outlet pipe are installed inside the shell; the anti-electric shock wall is installed inside the shell.

[0006] By adopting the above technical solution, the built-in anti-electric shock wall greatly improves the aesthetics of the small water heater.

[0007] Optionally, the anti-electric shock wall includes an outer tube and a guide pipe; the outer tube has an axially penetrating cylindrical flow channel; the guide pipe is disposed within the flow channel; three circumferentially distributed branch channels are formed between the cylindrical surface of the guide pipe and the flow channel; the cross-section of the branch channels is fan-shaped; a pair of vertically opening water passage holes are formed on a pair of sidewalls of one branch channel, and the pair of water passage holes are respectively close to the water inlet end and the water outlet end of the outer tube; one end of the other two branch channels axially penetrates the guide pipe, and the opening of one branch channel is close to the water inlet end of the outer tube, and the opening of the other branch channel is close to the water outlet end of the outer tube.

[0008] By adopting the above technical solution, water enters from the inlet end of the outer pipe, flows along the branch channel connected to the inlet end of the outer pipe, then enters the second branch channel through the first water passage, then enters the third branch channel through the second water passage, and finally flows out from the outlet end of the outer pipe. In this way, with this zigzag flow channel arrangement, the volume of the anti-electric wall required to set up the same length of insulating water circuit is smaller, which makes it easier to realize the internal installation of the anti-electric wall.

[0009] Optionally, the guide tube is integrally formed; the guide tube and the outer tube body are integrally injection molded.

[0010] By adopting the above technical solution, the number of components in the entire anti-electric shock wall is small, and the manufacturing and processing are convenient.

[0011] Optionally, the guide tube includes a first central isolation frame and a pair of first sealing seats; the first central isolation frame is integrally injection molded with the outer tube body; the three flow channels are located between the cylindrical surfaces of the first central isolation frame and the flow channels; the pair of first sealing seats are respectively welded to both ends of the first central isolation frame in the axial direction; the first sealing seat includes a first support frame with the same cross-section as the first central isolation frame and a first sealing plate formed on the end of the first support frame away from the first central isolation frame; the water passage is formed on the first support frame on the corresponding side; the opening of the flow channel is formed on the first sealing plate on the corresponding side.

[0012] By adopting the above technical solution, the structure of the guide tube is simple and the manufacturing and processing of the guide tube are convenient.

[0013] Optionally, the two ends of the flow channel are respectively formed with coaxially arranged cylindrical grooves; the diameter of the outer groove is larger than the diameter of the flow channel; the first sealing plate is located in the outer groove on the corresponding side and its diameter is the same as the diameter of the outer groove.

[0014] By adopting the above technical solution, the diameter of the first sealing plate is larger than the diameter of the flow channel, which helps to improve the sealing of the flow channel.

[0015] Optionally, a limiting slot is formed on the side wall of the outer mounting groove near the flow channel; a limiting block that mates with the limiting slot is formed on the end face of the first sealing plate near the first support frame.

[0016] By adopting the above technical solution, the limiting insert and the limiting slot cooperate to facilitate the rapid positioning of the first sealing seat, thereby improving the positional accuracy and welding speed of the first sealing seat.

[0017] Optionally, the guide pipe includes a second central isolation frame and a pair of second sealing plates; the second central isolation frame is integrally injection molded with the outer pipe body; the three flow channels are located between the cylindrical surfaces of the second central isolation frame and the flow channels; the pair of second sealing plates are respectively welded to both ends of the second central isolation frame in the axial direction; a pair of water passage holes are formed on the second central isolation frame; the second sealing plates are formed with fan-shaped second openings that cooperate with the flow channels on the corresponding sides.

[0018] By adopting the above technical solution, the structure of the guide tube is simple and the manufacturing and processing of the guide tube are convenient.

[0019] Optionally, the two ends of the flow channel are formed with coaxially arranged cylindrical grooves for external placement; the diameter of the external placement groove is larger than the diameter of the flow channel; the second sealing plate is located in the external placement groove on the corresponding side and its diameter is the same as the diameter of the external placement groove.

[0020] By adopting the above technical solution, the diameter of the second sealing plate is larger than the diameter of the flow channel, which helps to improve the sealing of the flow channel.

[0021] Optionally, obtuse-angled bends are formed on the two end faces of the second central isolation frame; the second sealing plate is located between the limit strips and the cylindrical surface of the outer mounting groove; the two sides of the limit strips abut against a pair of radial sidewalls of the second opening.

[0022] By adopting the above technical solution, the limiting strip is used to restrict the second sealing plate, which is conducive to the rapid positioning of the second sealing plate and improves the positional accuracy and welding speed of the second sealing plate.

[0023] Optionally, it also includes a return water device connected to the outlet pipe; the outlet pipe includes a first outlet pipe connected to the outlet end of the heating element, a second outlet pipe connected to the inlet end of the anti-electric wall, and a first solenoid valve connected between the first outlet pipe and the second outlet pipe; the return water device includes a water storage tank, a movable plate sealed and slidably connected in the water storage tank, and a return water driving component for driving the movable plate to move; a first return water inlet pipe and a first return water outlet pipe are connected to the end face of the water storage tank facing the movable plate; a second return water inlet pipe and a second return water outlet pipe are connected to the second outlet pipe; a second solenoid valve is connected between the second return water inlet pipe and the first return water inlet pipe; a one-way valve is connected between the second return water outlet pipe and the first return water outlet pipe.

[0024] By adopting the above technical solution, when the electric water heater stops working, the first solenoid valve closes, cutting off the connection between the first and second outlet pipes. Then, the second solenoid valve opens, and the return water drive moves the moving plate, drawing water from the second outlet pipe, the anti-electric shock wall, and the external water pipe into the storage tank. Then, the second solenoid valve closes. When the electric water heater starts working, the first solenoid valve opens, and hot water flows from the faucet through the second outlet pipe, the anti-electric shock wall, and the external water pipe. During this process, the return water drive moves the moving plate, causing water from the storage tank to flow into the second outlet pipe through the first return water outlet pipe, the one-way valve, and the second return water outlet pipe. This mixes the hot water in the second outlet pipe with the hot water, turning it into warm water. This ensures that the water flowing out when the electric water heater is working normally is not cold water, improving the user experience.

[0025] In summary, the beneficial effects of the present invention are as follows: 1. The built-in anti-electric shock wall greatly enhances the aesthetics of the mini water heater.

[0026] 2. By using a zigzag flow channel arrangement, the volume of the anti-electric shock wall required for the same length of insulating water channel is smaller, making it easier to build the anti-electric shock wall inside.

[0027] 3. This ensures that the water flowing out of the electric water heater during normal operation is not cold, thus improving the user experience. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a front view structural schematic diagram of the removal of the upper cover 12 of the present invention.

[0030] Figure 3 This is the invention Figure 2 A magnified structural diagram of part A in the diagram.

[0031] Figure 4 This is a cross-sectional structural schematic diagram of the water return device 60 of the present invention.

[0032] Figure 5 This is a schematic diagram of the anti-electric shock wall 50 structure of the present invention.

[0033] Figure 6 This is a cross-sectional structural diagram of the anti-electric shock wall 50 according to Embodiment 1 of the present invention.

[0034] Figure 7 This is a schematic diagram of the flow guide tube 52 according to Embodiment 1 of the present invention.

[0035] Figure 8 This is a cross-sectional structural diagram of the anti-electric shock wall 50 according to Embodiment 2 of the present invention.

[0036] Figure 9 This is a front view structural schematic diagram of the second embodiment of the present invention, showing the removal of the first sealing seat 54 along its axial direction.

[0037] Figure 10 This is a schematic diagram of the structure of a pair of first sealing seats 54 according to Embodiment 2 of the present invention.

[0038] Figure 11 This is a schematic diagram of the structure of removing the second sealing plate 56 in Embodiment 3 of the present invention.

[0039] Figure 12 This is a schematic diagram of the structure of a pair of second sealing plates 56 in Embodiment 3 of the present invention.

[0040] Explanation of reference numerals in the attached figures: 10. Housing; 11. Bottom cover; 12. Top cover; 20. Water inlet pipe; 30. Heating element; 40. Water outlet pipe; 41. First water outlet pipe; 42. First solenoid valve; 43. Second water outlet pipe; 50. Anti-electric shock wall; 500. Diversion channel; 51. Outer pipe body; 510. Flow channel; 511. Outer slot; 512. Outer mounting slot; 513. Limiting slot; 514. Mounting plate; 52. Guide pipe; 521. Intermediate partition frame; 5210. Water passage hole; 522. Side plug; 53. First central isolation frame; 54. First sealing seat; 541. First support frame; 542. First sealing plate; 5420. First opening; 5421. Limiting plug; 55. Second central isolation frame; 551. Limiting strip; 56. Second sealing plate; 560. Second opening; 60. Water return device; 61. Water storage tank; 62. Water return drive electric cylinder; 63. Moving plate; 64. First water return inlet pipe; 65. Second solenoid valve; 66. Second water return inlet pipe; 67. First water return outlet pipe; 68. Check valve; 69. Second water return outlet pipe. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1-12 The present invention will be described in further detail below.

[0042] Example 1: A small instant electric water heater is disclosed, referenced. Figure 1 and Figure 2The water heater includes a housing 10, an inlet pipe 20, a heating element 30, an outlet pipe 40, an anti-electric shock wall 50, and a return water device 60. The housing 10 includes a bottom cover 11 and a detachable upper cover 12 fixed to the bottom cover 11. The inlet pipe 20, heating element 30, outlet pipe 40, anti-electric shock wall 50, and return water device 60 are detachably fixed inside the bottom cover 11. The inlet pipe 20, heating element 30, outlet pipe 40, and anti-electric shock wall 50 are connected in sequence. When the water heater is working, water passes through the inlet pipe 20, heating element 30, outlet pipe 40, and anti-electric shock wall 50 in sequence. The return water device 60 is connected to the outlet pipe 40. The return water device 60 is used to draw back water near the external water pipe and return this water to the subsequent hot water after the water heater stops working.

[0043] refer to Figures 2-4 The water outlet pipe 40 includes a first water outlet pipe 41 connected to the water outlet end of the heating body 30, a second water outlet pipe 43 connected to the water inlet end of the anti-electric wall 50, and a first solenoid valve 42 connected between the first water outlet pipe 41 and the second water outlet pipe 43.

[0044] refer to Figure 3 and Figure 4 The water return device 60 includes a water storage tank 61, a movable plate 63 sealed and slidably connected within the water storage tank 61, and a water return drive component for driving the movable plate 63 to move. The water return drive component includes a water return drive electric cylinder 62 fixed to the outer end face of the water storage tank 61. The movable plate 63 is fixed to the piston rod of the water return drive electric cylinder 62. A first water return inlet pipe 64 and a first water return outlet pipe 67 are connected to the end face of the water storage tank 61 facing the movable plate 63. A second water return inlet pipe 66 and a second water return outlet pipe 69 are connected to the second outlet pipe 43. A second solenoid valve 65 is connected between the second water return inlet pipe 66 and the first water return inlet pipe 64. A one-way valve 68 is connected between the second water return outlet pipe 69 and the first water return outlet pipe 67.

[0045] refer to Figure 4 The water storage tank 61 can be a hollow cuboid or a hollow cylinder; the shape of the movable plate 63 is the same as the internal cross-sectional shape of the water storage tank 61, and a sealing ring is provided between the periphery of the movable plate 63 and the inner wall of the water storage tank 61.

[0046] refer to Figures 5-7The anti-electric shock wall 50 includes an outer tube 51 and a guide tube 52; the outer tube 51 has an axially penetrating cylindrical flow channel 510 formed on it, and a pair of mounting plates 514 for installation are formed on the outer surface of the outer tube 51; the two ends of the flow channel 510 are respectively formed with coaxially arranged cylindrical grooves 512; the diameter of the outer groove 512 is larger than the diameter of the flow channel 510; the middle part of the guide tube 52 is located in the flow channel 510 and the two ends are respectively located in a pair of outer grooves 512; the guide tube 52 and the outer tube 51 are integrally injection molded.

[0047] refer to Figures 5-7 The guide tube 52 is integrally formed; the guide tube 52 includes a central partition frame 521 and a pair of circular plate-shaped side blocks 522 respectively formed at both ends of the central partition frame 521; the central partition frame 521 includes three circumferentially evenly distributed radial partitions and the inner ends of the three radial partitions are connected as one piece; three outer slots 511 that mate with the radial partitions are formed on the cylindrical surface of the flow channel 510; three circumferentially evenly distributed partitions are formed between the central partition frame 521 and the cylindrical surface of the flow channel 510. The distribution channel 500 of the cloth; the cross-section of the distribution channel 500 is fan-shaped; a pair of radial partitions of one distribution channel 500 are respectively formed with vertically open water passage holes 5210 and the pair of water passage holes 5210 are close to the water inlet end and the water outlet end of the outer pipe body 51 respectively; one end of the other two distribution channels 500 axially penetrates the corresponding side block 522; the opening of one distribution channel 500 is close to the water inlet end of the outer pipe body 51 and the opening of the other distribution channel 500 is close to the water outlet end of the outer pipe body 51.

[0048] refer to Figures 5-7 The outer ends of the three radial partitions of the intermediate partition 521 are arc surfaces and the three arc surfaces are on the same cylindrical surface; the cylindrical surface where the outer ends of the three radial partitions of the intermediate partition 521 are located has the same diameter as the side block 522 and the two are coaxially arranged; the diameter of the side block 522 is the same as the diameter of the outer mounting groove 512.

[0049] The working principle of Example 1 is as follows: When the electric water heater stops working, the first solenoid valve 42 closes, cutting off the connection between the first outlet pipe 41 and the second outlet pipe 43. Then, the second solenoid valve 65 opens, and the return water drive cylinder 62 moves the moving plate 63, drawing water from the second outlet pipe 43, the anti-electric wall 50, and the external water pipe into the storage tank 61. Then, the second solenoid valve 65 closes. When the electric water heater starts working, the first solenoid valve 42 opens, and hot water flows from the faucet through the second outlet pipe 43, the anti-electric wall 50, and the external water pipe. During this process, the return water drive cylinder 62 moves the moving plate 63, causing water in the storage tank 61 to flow into the second outlet pipe 43 through the first return water outlet pipe 67, the one-way valve 68, and the second return water outlet pipe 69. In this way, the hot water in the second outlet pipe 43 mixes with the hot water, becoming warm water.

[0050] The working principle of the anti-electric wall 50 is as follows: water enters from the inlet end of the outer pipe body 51, flows along the diversion channel 500 connected to the inlet end of the outer pipe body 51, then enters the second diversion channel 500 through the first water passage 5210, then enters the third diversion channel 500 through the second water passage 5210, and finally flows out from the outlet end of the outer pipe body 51.

[0051] Example 2: The difference between Example 2 and Example 1 is that the guide tube 52 is not integrally formed. (Refer to...) Figures 8-10 The guide tube 52 includes a first central isolation frame 53 and a pair of first sealing seats 54; the cross-section of the first central isolation frame 53 is the same as the cross-section of the intermediate partition frame 521; the first central isolation frame 53 is integrally injection molded with the outer tube body 51; the pair of first sealing seats 54 are welded to both ends of the first central isolation frame 53 along the axial direction; the first sealing seat 54 includes a first support frame 541 with the same cross-section as the first central isolation frame 53 and a first sealing plate 542 formed at the end of the first support frame 541 away from the first central isolation frame 53; the first The sealing plate 542 has a first opening 5420 formed on it to cooperate with the diversion channel 500; the first opening 5420 is close to the water inlet or water outlet of the outer pipe body 51; the water passage hole 5210 is formed on the first support frame 541; another water passage hole 5210 is formed on another first support frame 541; the three ends of the first support frame 541 are respectively inserted into the three outer slots 511; the diameter of the outer mounting groove 512 is larger than the diameter of the cylindrical surface of the outer slot 511; the diameter of the outer mounting groove 512 is the same as the diameter of the first sealing plate 542.

[0052] In order to achieve rapid positioning between the pair of first sealing seats 54 and the first central isolation frame 53, a limiting slot 513 is formed on the side wall of the outer mounting groove 512 near the flow channel 510; a limiting block 5421 that cooperates with the limiting slot 513 is formed on the end face of the first sealing plate 542 near the first support frame 541.

[0053] The working principle of the anti-electric shock wall 50 in Example 2: Water enters from the inlet end of the outer pipe body 51, then enters the branch channel 500 connected to the inlet end of the outer pipe body 51 through the first opening 5420 on the corresponding side; then enters the second branch channel 500 through the first water passage 5210, then enters the third branch channel 500 through the second water passage 5210, then enters the first opening 5420 on the other side, and finally flows out from the outlet end of the outer pipe body 51.

[0054] Example 3: The difference between Example 3 and Example 1 is that the guide tube 52 is not integrally formed. (Refer to...) Figure 11 and Figure 12 The guide pipe 52 includes a second central isolation frame 55 and a pair of second sealing plates 56; the second central isolation frame 55 is integrally injection molded with the outer pipe body 51; a pair of water passage holes 5210 are formed on the second central isolation frame 55; no external slots 511 are provided on the side wall of the flow channel 510; the pair of second sealing plates 56 are respectively welded to both ends of the second central isolation frame 55; the axial length of the second central isolation frame 55 is the same as the distance between a pair of external placement slots 512 and the two end faces of the second central isolation frame 55 are respectively flush with the end faces of a pair of external placement slots 512 that are close to each other; the diameter of the second sealing plate 56 is the same as the diameter of the external placement slot 512; the second sealing plate 56 has a fan-shaped second opening 560 that cooperates with the flow channel 500.

[0055] In order to achieve rapid positioning between the pair of second sealing plates 56 and the second central isolation frame 55, obtuse-angled limit strips 551 are formed on the two end faces of the second central isolation frame 55 along the axial direction; the two ends of the limit strips 551 are formed on the cylindrical surface of the outer mounting groove 512; the second sealing plates 56 are located between the limit strips 551 and the cylindrical surface of the outer mounting groove 512; the two sides of the limit strips 551 abut against a pair of radial sidewalls of the second opening 560.

[0056] The working principle of the anti-electric shock wall 50 in Example 3: Water enters from the inlet end of the outer pipe body 51, then enters the branch channel 500 connected to the inlet end of the outer pipe body 51 through the second opening 560 on the corresponding side; then enters the second branch channel 500 through the first water passage 5210, then enters the third branch channel 500 through the second water passage 5210, then enters the second opening 560 on the other side, and finally flows out from the outlet end of the outer pipe body 51.

[0057] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An instantaneous small electric water heater, comprising a shell (10), an inlet pipe (20), a heating element (30), an outlet pipe (40), and an anti-electric shock wall (50); wherein the inlet pipe (20), the heating element (30), the outlet pipe (40), and the anti-electric shock wall (50) are connected in sequence; wherein the inlet pipe (20), the heating element (30), and the outlet pipe (40) are installed inside the shell (10); characterized in that: The anti-electric wall (50) is installed inside the housing (10).

2. The instantaneous small electric water heater according to claim 1, characterized in that: The anti-electric wall (50) includes an outer tube (51) and a guide tube (52); the outer tube (51) has an axially penetrating cylindrical flow channel (510); the guide tube (52) is disposed inside the flow channel (510); three circumferentially distributed branch channels (500) are formed between the cylindrical surfaces of the guide tube (52) and the flow channel (510); the cross-section of the branch channels (500) is fan-shaped; one of the branch channels (500) The outer tube (51) has vertically open water passage holes (5210) formed on its two side walls, and the two water passage holes (5210) are respectively close to the water inlet end and the water outlet end of the outer tube (51); one end of the other two diversion channels (500) axially penetrates the guide pipe (52), and the opening of one diversion channel (500) is close to the water inlet end of the outer tube (51), and the opening of the other diversion channel (500) is close to the water outlet end of the outer tube (51).

3. The instantaneous small electric water heater according to claim 2, characterized in that: The guide tube (52) is integrally formed; the guide tube (52) and the outer tube body (51) are integrally injection molded.

4. The instantaneous small electric water heater according to claim 2, characterized in that: The guide pipe (52) includes a first central isolation frame (53) and a pair of first sealing seats (54); the first central isolation frame (53) is integrally injection molded with the outer pipe body (51); the three diversion channels (500) are located between the cylindrical surfaces of the first central isolation frame (53) and the flow channel (510); the pair of first sealing seats (54) are respectively welded to the two ends of the first central isolation frame (53) in the axial direction; the first sealing seat (54) includes a first support frame (541) with the same cross-section as the first central isolation frame (53) and a first sealing plate (542) formed on the end of the first support frame (541) away from the first central isolation frame (53); the water passage (5210) is formed on the first support frame (541) on the corresponding side; the opening of the diversion channel (500) is formed on the first sealing plate (542) on the corresponding side.

5. The instantaneous small electric water heater according to claim 4, characterized in that: The flow channel (510) has coaxially arranged cylindrical groove-shaped outer mounting grooves (512) formed at both ends of its axial direction; the diameter of the outer mounting groove (512) is larger than the diameter of the flow channel (510); the first sealing plate (542) is located in the outer mounting groove (512) on the corresponding side and its diameter is the same as the diameter of the outer mounting groove (512).

6. The instantaneous small electric water heater according to claim 5, characterized in that: The outer mounting groove (512) has a limiting slot (513) formed on the side wall near the flow channel (510); the first sealing plate (542) has a limiting plug (5421) formed on the end face near the first support frame (541) that cooperates with the limiting slot (513).

7. The instantaneous small electric water heater according to claim 2, characterized in that: The guide pipe (52) includes a second central isolation frame (55) and a pair of second sealing plates (56); the second central isolation frame (55) is integrally injection molded with the outer pipe body (51); the three diversion channels (500) are located between the cylindrical surfaces of the second central isolation frame (55) and the flow channel (510); the pair of second sealing plates (56) are respectively welded to both ends of the axial direction of the second central isolation frame (55); a pair of water passage holes (5210) are formed on the second central isolation frame (55); the second sealing plate (56) has a fan-shaped second opening (560) formed on it to cooperate with the diversion channel (500) on the corresponding side.

8. The instantaneous small electric water heater according to claim 7, characterized in that: The flow channel (510) has coaxially arranged cylindrical groove-shaped outer mounting grooves (512) formed at both ends of its axial direction; the diameter of the outer mounting groove (512) is larger than the diameter of the flow channel (510); the second sealing plate (56) is located in the outer mounting groove (512) on the corresponding side and its diameter is the same as the diameter of the outer mounting groove (512).

9. A small instantaneous electric water heater according to claim 8, characterized in that: The second central isolation frame (55) has obtuse-angle bent limiting strips (551) formed on the two end faces of its axial direction; the second sealing plate (56) is located between the limiting strip (551) and the cylindrical surface of the outer mounting groove (512); the two sides of the limiting strip (551) abut against a pair of radial sidewalls of the second opening (560).

10. An instantaneous small electric water heater according to any one of claims 1-9, characterized in that: It also includes a return water device (60) connected to the outlet pipe (40); the outlet pipe (40) includes a first outlet pipe (41) connected to the outlet end of the heating element (30), a second outlet pipe (43) connected to the inlet end of the anti-electric wall (50), and a first solenoid valve (42) connected between the first outlet pipe (41) and the second outlet pipe (43); the return water device (60) includes a water storage tank (61), a movable plate (63) sealed and slidably connected within the water storage tank (61), and a device for driving the movable plate (63). 63) A movable return water drive unit; the water storage tank (61) is connected to a first return water inlet pipe (64) and a first return water outlet pipe (67) on the end face of the movable plate (63); the second outlet pipe (43) is connected to a second return water inlet pipe (66) and a second return water outlet pipe (69); a second solenoid valve (65) is connected between the second return water inlet pipe (66) and the first return water inlet pipe (64); a one-way valve (68) is connected between the second return water outlet pipe (69) and the first return water outlet pipe (67).

Images