Water inlet pipe assembly and electric water heater

Abstract

A water inlet pipe assembly comprises a water inlet pipe connector and a water inlet pipe, one end of the water inlet pipe is connected with the water inlet pipe connector, the other end of the water inlet pipe is bent towards one side and then extends for a certain distance along a straight line, the water inlet pipe comprises a water inlet inner pipe and a water inlet outer pipe, and the water inlet inner pipe comprises a bent section and a straight section. The bent section is provided with a straight section, the straight section is upwards provided with a water inlet, the water inlet outer pipe comprises a supporting bent pipe and a drainage hole pipe, the drainage hole pipe is downwards provided with a drainage hole, the supporting bent pipe is arranged on the bent section in a sleeving manner, and the drainage hole pipe is arranged on the straight section in a sleeving manner; water entering the water inlet inner pipe through the water inlet pipe connector flows into a gap formed by the water inlet inner pipe and the drainage hole pipe from the water inlet and is drained through the drainage hole. Compared with the prior art, the technical scheme provided by the utility model has the advantages that the inflow water flow is uniform and gentle to avoid disturbing a hot water layer, a stagnant water area is prevented, a water resistance structure is also provided, and healthy and fresh water flow is provided.

Description

Technical Field

[0001] The utility model relates to the field of water inlet pipe components for electric water heaters. Background Art

[0002] At present, most of the storage-type electric water heaters on the market use the arrangement of water inlet and outlet pipes with hot water coming out from the top of the inner tank and cold water coming in from the bottom, so as to reduce the disturbance of cold water on the upper hot water layer and prevent the phenomenon of alternating hot and cold water supply. Moreover, in order to further reduce the disturbance caused by cold water, a water inlet pipe with a double-layer tube "M"-shaped flow channel or even a water inlet pipe with a water baffle / cap is usually used to slow down the rapid and uneven change of water temperature around the drainage hole caused by the rapid inflow of cold water, which affects the upper hot water layer. That is, the water flows upward through the inner tube, then flows downward along the gap between the inner tube and the outer tube, and finally discharges the cold water into the inner tank through the drainage hole arranged around the lower part of the outer tube. However, this water inlet pipe is generally inserted vertically into the inner tank, so the position of the water inlet pipe is not close to the left half of the tank. It is close to the right half of the tank, so it is difficult to take into account the water flow in the other half of the tank at the same time, which can easily lead to the hot water in the other half of the tank being unable to be quickly supplied to the upper layer, resulting in a "dead water zone" and causing scale deposition and bacteria growth. In addition, in actual applications, because the position of the drain hole is generally close to the top and far away from the bottom of the tank, it is difficult to circulate the water between the bottom of the tank and the drain hole, which aggravates the problem; the above-mentioned water inlet pipe with a water baffle / cap will also lead to assembly difficulties, and people need to reach into the inner tank to operate, which is difficult and inefficient.

[0003] For example, the Chinese utility model entitled "An electric water heater with antibacterial water pipe" with the authorization announcement number CN204574420U discloses: comprising an inner tank and an outer shell, wherein an electric heating pipe 8, a water inlet pipe 1, and a water outlet pipe 7 are arranged in the inner tank, and a soft water pipe and a flower wine 4 are connected to the water outlet of the outer shell ( Figure 2(not shown), the water inlet pipe includes an inner pipe (i.e., an inner stainless steel pipe 14) and an outer pipe (an outer stainless steel pipe 12), and both the inner pipe and the outer pipe are stainless steel pipes. Plugs are installed on the top of the inner pipe and the outer pipe to seal the tops of the two pipes, and a sealing ring 11 is used to increase its sealing performance. A PPR (random copolymer polypropylene) antibacterial layer 13 is coated on the inner wall of the inner pipe. A plurality of water outlets are arranged on the lower part of the outer pipe of the water inlet pipe, and a water hole is arranged on the top of the inner pipe, so that the tap water first enters the inner pipe of the water inlet pipe, enters the interlayer between the inner and outer pipes through the water hole at the top, and then enters the inner tank of the water heater through the water outlet at the bottom of the outer pipe. The plug covers the tops of the inner pipe and the outer pipe, and the inner wall of the inner pipe is coated with a PPR antibacterial coating. A pipe joint is arranged at the end of the inner pipe of the water inlet pipe, and the pipe joint comprises a positioning sleeve 15 installed at the bottom of the inner pipe, and two copper inserts (16 copper insert one and 18 copper insert two), the copper insert one is used to connect the positioning sleeve and the pipe joint body, the copper insert two is used to connect the external tap water pipe, and a sealing rubber pad 17 is arranged at the bottom of the positioning sleeve. The technical solution described in the utility model has the above-mentioned problem of the occurrence of "dead water area" and the deposition of scale and the breeding of bacteria.

[0004] For another example, the Chinese utility model patent with the authorization announcement number CN201111621Y and the title of a drain pipe capable of reducing the drainage pressure of the water inlet pipe of an electric water heater discloses: a T-shaped three-way pipe body (3) having an integral injection molding structure, the ends of the two opposite straight through channels of the three-way pipe body (3) being closed, the ends of the two straight through channels being sealed and having drainage ports (4) on the side surfaces, the outsides of the two straight through channels being closed, each being tightly combined with a sleeve (1), the sleeve (1) and the annular concave cavity outside the two straight through channels being closed forming a drain cavity (5) connected to the drain port, and one side of the sleeve (1) having axially arranged drain holes (2). Although the technical solution described in the utility model solves the problem of "dead water zone" to a certain extent, it has a single function and does not have a water resistance structure.

[0005] For another example, the Chinese utility model patent entitled "Electric water heater with high hot water output rate" with authorization announcement number CN205536509U discloses: including an inner tank, a flange for fixing an upper heating tube, a lower heating tube and an obliquely arranged magnesium rod is arranged at the center of the right end of the inner tank, the inner space of the inner tank is divided into an upper heating zone, a middle heating zone and a lower heating zone from top to bottom, the upper heating tube is located in the upper heating zone of the inner tank, and the lower heating tube is located in the middle and lower heating zones of the inner tank; the bottom of the inner tank is connected to the water inlet pipe and the water outlet pipe, the water outlet pipe in the inner tank is bent toward the upper left end of the inner tank and is arranged close to the heating tube, the water inlet pipe is bent toward the lower right end of the inner tank, the end of the water inlet pipe is closed but the pipe body is provided with a water inlet hole with an opening facing downward. The technical solution described in the utility model, although the water inlet pipe is bent toward the lower right end of the inner tank, it is impossible to buffer and reverse the water flow because it does not adopt a double-layer tube structure, which easily leads to drastic changes in water temperature and large disturbance. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a water inlet pipe assembly and an electric water heater with uniform and smooth water flow to avoid disturbing the hot water layer and preventing the occurrence of dead water areas, and having a water resistance structure to provide healthy and fresh water flow.

[0007] The utility model mainly adopts the following technical solutions:

[0008] A water inlet pipe assembly comprises a water inlet pipe joint and a water inlet pipe, one end of the water inlet pipe is connected to the water inlet pipe joint, the other end of the water inlet pipe is bent to one side and then extends along a straight line for a distance, the water inlet pipe comprises an inner water inlet pipe and an outer water inlet pipe, the inner water inlet pipe comprises a bent section and a straight section, the straight section is provided with a water inlet upward, the outer water inlet pipe comprises a supporting elbow and a drainage hole pipe, the drainage hole pipe is provided with a drainage hole downward, the supporting elbow is sleeved on the bent section, and the drainage hole pipe is sleeved on the straight section, water entering the inner water inlet pipe through the water inlet pipe joint flows from the water inlet into the gap formed by the inner water inlet pipe and the drainage hole pipe, and is discharged through the drainage hole.

[0009] The water inlet pipe joint is provided with a central channel connected with the water inlet inner pipe, and the water inlet pipe joint is also provided with an insertion sink extending along the central channel, and the water inlet inner pipe is inserted into the insertion sink to connect with the central channel.

[0010] Among them, the water inlet pipe joint is also formed with a fixed sink platform, a step-like structure is formed between the fixed sink platform and the plug-in sink platform, and also includes a limit seat, and the limit seat is clamped into the fixed sink platform.

[0011] Among them, the limiting seat includes a limiting rubber ring and a sealing ring, the supporting elbow is inserted into the limiting rubber ring, the top edge of the supporting elbow is folded outward to form a limiting edge, and the limiting edge is clamped between the end face of the limiting rubber ring and the sealing ring.

[0012] Wherein, the end surface of the limiting rubber ring is also formed with a clearance groove, and the limiting edge is located in the clearance groove.

[0013] The sealing ring is provided with a mounting protrusion on the opposite side thereof engaged with the limiting rubber ring, and a mounting groove is also formed at the step-shaped structure formed between the fixed sinker and the plug-in sinker, and the mounting protrusion is inserted into the mounting groove.

[0014] Wherein, the water inlet inner pipe is also provided with a separation ring, the separation ring is located between the bent section and the straight section, and the top edge of the end of the supporting elbow opposite to the limiting edge abuts against the end surface of the separation ring.

[0015] Wherein, the water inlet inner pipe is also sleeved with a support ring, the support ring is located in the straight section, the separation ring is also formed with a ring sleeve seat, the drainage hole pipe is sleeved on the support ring and one end of it is inserted into the ring sleeve seat.

[0016] Wherein, it also includes a sealing end cover, which is arranged at the other end of the water inlet pipe to seal the water inlet inner pipe and the drainage hole pipe.

[0017] Wherein, the sealing end cover includes an inner tube plug, which is installed in the water inlet inner tube to seal the water inlet inner tube. A clamping hole is also opened on the water inlet inner tube, and a buckle is formed on the inner tube plug. The buckle is clamped into the clamping hole to fix the sealing end cover to the other end of the water inlet pipe.

[0018] Wherein, the sealing end cover also includes an outer pipe plug, which is connected to the inner pipe plug and is installed in the drain hole pipe.

[0019] Wherein, a handle is also formed on the end surface of the outer pipe plug.

[0020] Wherein, the other end of the water inlet pipe is a closed end.

[0021] An electric water heater adopts the water inlet pipe assembly.

[0022] Among them, it includes an inner tank, the water inlet pipe assembly is arranged at the bottom of the inner tank cavity, and the straight section extends along the bottom wall of the inner tank.

[0023] According to the technical scheme described in the utility model, the following beneficial effects are achieved: the water inlet inner tube includes a bent section and a straight section. The bent water inlet inner tube provides conditions for the straight section to extend along the bottom of the inner tank of the electric water heater, which can prevent the formation of a "dead water zone" in a part of the inner tank, prevent the deposition of scale and the breeding of bacteria, and the downwardly opened drainage hole also increases the water flow speed between the drainage hole and the bottom of the inner tank, preventing the deposition of scale and the breeding of bacteria at this position; the "double-layer tube" drainage method in which the water inlet inner tube and the drainage hole tube are matched can reverse and buffer the direction of the flowing water, so that the cold water inlet is more uniform and smooth, and the disturbance of the upper hot water layer is prevented; the water inlet pipe is inserted into the plug-in sinking platform and the supporting bent pipe supporting the bent section is limited in the fixed sinking platform through the limit seat. On the one hand, the structure is more stable, and on the other hand, a water resistance structure is provided, and the function is more complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of a water inlet pipe assembly in one embodiment of the present application.

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the middle water inlet pipe assembly viewed from above.

[0026] Figure 3 for Figure 2 Schematic diagram of the AA section structure.

[0027] Figure 4 for Figure 3 Enlarged view of part B in the middle.

[0028] Figure 5 This is a schematic diagram of the structure of a water inlet pipe assembly in another embodiment of the present application.

[0029] Figure 6 for Figure 5 Schematic diagram of the structure of the middle water inlet pipe assembly viewed from above.

[0030] Figure 7 for Figure 6 Schematic diagram of the CC section structure, where the arrows indicate the direction of water flow.

[0031] Figure 8 for Figure 6 Schematic diagram of the DD cross-section structure, where the arrows indicate the direction of water flow.

[0032] Fig. 9 This is a schematic diagram of the structure of an electric water heater using the water inlet pipe assembly of the present application.

[0033] 1 water inlet pipe joint, 10 center channel, 100 plug-in sinker, 1000 fixed sinker, 2 water inlet pipe, 21 water inlet inner pipe, 210 water inlet, 2100 clamping hole, 211 bending section, 2211 limiting edge, 212 straight section, 22 water inlet outer pipe, 220 drainage hole, 221 supporting elbow, 222 drainage hole pipe, 3 limiting seat, 31 limiting rubber ring, 310 giving way groove, 32 sealing ring, 321 mounting convex, 4 dividing ring, 41 ring sleeve seat, 5 supporting ring, 6 sealing end cover, 61 inner pipe plug, 62 outer pipe plug, 63 limiting column, M inner liner. DETAILED DESCRIPTION

[0034] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0035] See also Figures 1 to 3As shown in , 5 to 8, a water inlet pipe assembly includes a water inlet pipe joint 1 and a water inlet pipe 2, one end of the water inlet pipe 2 is connected to the water inlet pipe joint 1, and the other end of the water inlet pipe 2 is bent to one side and then extends along a straight line for a distance, the water inlet pipe 2 includes an inner water inlet pipe 21 and an outer water inlet pipe 22, the inner water inlet pipe includes a bent section 211 and a straight section 212, the straight section 212 is provided with a water inlet 210 upward, the outer water inlet pipe 22 includes a supporting elbow 221 and a drainage hole pipe 222, the drainage hole pipe 222 is provided with a drainage hole 220 downward, the supporting elbow 221 is sleeved on the bent section 211, and the drainage hole pipe 222 is sleeved on the straight section 212, water entering the inner water inlet pipe 21 through the water inlet pipe joint 1 flows from the water inlet 210 into the gap formed by the inner water inlet pipe 21 and the drainage hole pipe 222 and is discharged through the drainage hole 220. Preferably, the water inlet inner tube 21 is made of insulating material, the supporting elbow 221 is made of metal material, and the drain hole tube 222 is made of metal material. Preferably, the bottom outer peripheral surface of the water inlet pipe joint 1 is formed with external threads. In the present application, the water inlet pipe is extended along a straight line for a distance after being bent, which provides a prerequisite for the straight section of the water inlet inner tube to extend along the bottom of the water heater inner tank. This layout design can prevent the "dead water area" from appearing in the left half tank or the right half tank, prevent the deposition of scale and the breeding of bacteria. The downwardly opened drain hole also increases the water flow speed between the drain hole tube and the bottom of the inner tank, preventing the deposition of scale and the breeding of bacteria in this area. In the present application, the "double-layer tube" drainage method in which the water inlet inner tube and the drain hole tube are matched and the position setting of the water inlet and the drain hole are superimposed, which can reverse the direction of the water flow and play a role in buffering the water flow, making the cold water inlet more uniform and smooth, and preventing the upper hot water layer from being disturbed and causing the water supply to be hot and cold.

[0036] See also Figure 3 , 4 As shown in 7, the water inlet pipe joint 1 is provided with a central channel 10 connected to the water inlet inner tube 21, and the water inlet pipe joint 1 is also formed with an insertion sink 100 extending along the central channel 10, and the water inlet inner tube 21 is inserted into the insertion sink 100 to connect with the central channel 10. This structural design makes the connection between the water inlet inner tube and the water inlet pipe joint more stable. Preferably, the insertion sink 100 can be an annular groove recessed structure surrounding the periphery of the central channel 10 (at this time, there is a surrounding wall between the insertion sink and the central channel in the radial direction, and the pipe wall of the water inlet inner tube is inserted into the annular groove and supports the water inlet inner tube through the surrounding wall), or it can be a cylindrical recessed structure with a diameter greater than the central channel 10 and coaxial with the central channel 10 (at this time, there is no surrounding wall, and the water inlet inner tube is directly inserted into the insertion sink and connected with the central channel). In the present application, the water resistance structure is formed by the above scheme, and the function of the water inlet pipe assembly is more perfect.

[0037] See also Figure 3 , 4As shown in Figures 7 and 8, the water inlet pipe connector 1 is also formed with a fixed sink 1000, a step-shaped structure is formed between the fixed sink 1000 and the plug-in sink 100, and also includes a limit seat 3, which is inserted into the fixed sink 1000. In the present application, the support elbow is fixed by setting the limit seat, so as to ensure that the bending section is stably supported and prevent shaking when cold water is inlet. Preferably, an internal thread is formed on the inner peripheral wall of the fixed sink.

[0038] See also Figure 3 , 4 As shown in Figures 7 and 8, the limiting seat 3 includes a limiting rubber ring 31 and a sealing ring 32. The support elbow 221 is inserted into the limiting rubber ring 31. The top edge of the support elbow 221 is folded outward to form a limiting edge 2211. The limiting edge 2211 is clamped between the end surface of the limiting rubber ring 31 and the sealing ring 32. This structural design can make the limiting edge of the support elbow more firmly clamped. Preferably, the longitudinal section of the limiting rubber ring is T-shaped as a whole.

[0039] See also Figure 4 As shown, the end surface of the limiting rubber ring 31 is also formed with a clearance groove 310, and the limiting edge 3311 is located in the clearance groove 310. This structural design is conducive to the fit between the limiting rubber ring and the sealing ring, and the installation between the limiting rubber ring and the sealing ring is tighter.

[0040] See also Figure 3 , 4 As shown in FIG. 7 , the sealing ring 32 is formed with a mounting protrusion 321 on the opposite side of the sealing ring 32 engaged with the limiting rubber ring 31, and a mounting groove is also formed at the step-shaped structure formed between the fixed sinking platform 1000 and the plug-in sinking platform 100, and the mounting protrusion 321 is installed in the mounting groove. This structural design plays a role in positioning and guiding, making the installation operation more convenient.

[0041] See also Figure 3 , 7 As shown, a separation ring 4 is also mounted on the water inlet inner pipe 21 , and the separation ring 4 is located between the bent section 211 and the straight section 212 , and the top edge of the end of the supporting elbow 221 opposite to the limiting edge 2211 abuts against the end surface of the separation ring 4 .

[0042] See also Figure 3 As shown, the water inlet inner tube 21 is also sleeved with a support ring 5, the support ring 5 is located in the straight section 212, the separation ring 4 is also formed with a ring sleeve seat 41, the drain hole pipe 222 is sleeved on the support ring 5 and one end of it is inserted into the ring sleeve seat 41. In the present application, the support ring and the ring sleeve seat both support the drain hole pipe to prevent shaking when the cold water is drained.

[0043] See also Figures 1 to 3 As shown, a sealing end cover 6 is also included, and the sealing end cover 6 is arranged at the other end of the water inlet pipe 2 to seal the water inlet inner pipe 21 and the drainage hole pipe 222.

[0044] See also Figure 3 As shown, the sealing end cover 6 includes an inner tube plug 61, which is inserted into the water inlet inner tube 21 to seal the water inlet inner tube 21. A clamping hole 2100 is also provided on the water inlet inner tube 21, and a buckle 611 is formed on the inner tube plug 61. The buckle 611 is clamped into the clamping hole 2100 to fix the sealing end cover 6 to the other end of the water inlet pipe 2.

[0045] See also Figure 3 As shown, the sealing end cover 6 further comprises an outer pipe plug 62, which is connected to the inner pipe plug 61 and is installed in the drain hole pipe 222. Preferably, the main body cross section of the sealing end cover 6 is T-shaped.

[0046] See also Figures 1 to 3 As shown, a limiting column 63 is also formed on the end surface of the outer pipe plug 62. When assembling, the water inlet pipe is first installed in the inner tank, and then matched with other components in the inner tank through the limiting column (for example, the limiting column abuts against the water outlet pipe), and then the water inlet pipe joint is assembled, thereby preventing the water inlet pipe from rotating when installing the water inlet pipe joint, and the installation is more convenient.

[0047] See also Figures 5 to 8 As shown, in another embodiment, the other end of the water inlet pipe 2 is a closed end.

[0048] An electric water heater, see Fig. 9 As shown, the above-mentioned water inlet pipe assembly is adopted.

[0049] See also Fig. 9 As shown, it includes an inner tank M, a water inlet pipe assembly is arranged at the bottom of the cavity of the inner tank M, and a straight section 212 extends along the bottom wall of the inner tank M. This structural design prevents the appearance of a "dead water zone" in the left or right half tank, prevents the deposition of scale and the breeding of bacteria, and provides users with fresh and clean water. Preferably, the distance between the drain hole pipe 222 of the water inlet pipe 2 and the bottom wall of the inner tank is between 10 cm and 30 cm, so as to prevent the deposition of scale in the space between the drain hole pipe and the bottom wall of the inner tank.

[0050] Although the specific implementation modes of the present invention have been described above, those skilled in the art may modify the present invention without departing from the spirit and principle of the present invention. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A water inlet pipe assembly, comprising a water inlet pipe joint and a water inlet pipe, wherein one end of the water inlet pipe is connected to the water inlet pipe joint, and the other end of the water inlet pipe is bent to one side and then extends along a straight line for a distance, characterized in that: The water inlet pipe includes an inner water inlet pipe and an outer water inlet pipe, the inner water inlet pipe includes a bent section and a straight section, the straight section is provided with a water inlet upward, the outer water inlet pipe includes a supporting elbow and a drainage hole pipe, the drainage hole pipe is provided with a drainage hole downward, the supporting elbow is sleeved on the bent section, the drainage hole pipe is sleeved on the straight section, and water entering the inner water inlet pipe through the water inlet pipe joint flows from the water inlet into the gap formed by the inner water inlet pipe and the drainage hole pipe and is discharged through the drainage hole.

2. The water inlet pipe assembly according to claim 1, characterized in that: The water inlet pipe joint is provided with a central channel connected with the water inlet inner pipe, and the water inlet pipe joint is also formed with an insertion sink extending along the central channel, and the water inlet inner pipe is inserted into the insertion sink to connect with the central channel.

3. The water inlet pipe assembly according to claim 2, characterized in that: The water inlet pipe joint is also formed with a fixed sunken platform, a step-shaped structure is formed between the fixed sunken platform and the plug-in sunken platform, and also includes a limiting seat, and the limiting seat is clamped into the fixed sunken platform.

4. The water inlet pipe assembly according to claim 3, characterized in that: The limiting seat includes a limiting rubber ring and a sealing ring. The supporting elbow is inserted into the limiting rubber ring. The top edge of the supporting elbow is folded outward to form a limiting edge. The limiting edge is clamped between the end face of the limiting rubber ring and the sealing ring.

5. The water inlet pipe assembly according to claim 4, characterized in that: The end surface of the limiting rubber ring is also formed with a clearance groove, and the limiting edge is located in the clearance groove.

6. The water inlet pipe assembly according to claim 4, characterized in that: The sealing ring is formed with a mounting protrusion on the opposite side engaged with the limiting rubber ring, and a mounting groove is also formed at the step-shaped structure formed between the fixed sink platform and the inserted sink platform, and the mounting protrusion is installed in the mounting groove.

7. The water inlet pipe assembly according to claim 4, characterized in that: The water inlet inner pipe is also provided with a separation ring, which is located between the bent section and the straight section. The top edge of the end of the supporting elbow opposite to the limiting edge abuts against the end surface of the separation ring.

8. The water inlet pipe assembly according to claim 7, characterized in that: The water inlet inner pipe is also sleeved with a support ring, the support ring is located in the straight section, the separation ring is also formed with a ring sleeve seat, the drainage hole pipe is sleeved on the support ring and one end of it is inserted into the ring sleeve seat.

9. The water inlet pipe assembly according to any one of claims 1 to 8, characterized in that: It also includes a sealing end cover, which is arranged at the other end of the water inlet pipe to seal the water inlet inner pipe and the drainage hole pipe.

10. The water inlet pipe assembly according to claim 9, characterized in that: The sealing end cover includes an inner tube plug, which is installed in the water inlet inner tube to seal the water inlet inner tube. The water inlet inner tube is also provided with a clamping hole, and the inner tube plug is also formed with a buckle, which is clamped into the clamping hole to fix the sealing end cover to the other end of the water inlet pipe.

11. The water inlet pipe assembly according to claim 10, characterized in that: The sealing end cover also includes an outer pipe plug, which is connected to the inner pipe plug and is installed in the drain hole pipe.

12. The water inlet pipe assembly according to claim 11, characterized in that: A handle is also formed on the end surface of the outer pipe plug.

13. The water inlet pipe assembly according to any one of claims 1 to 8, characterized in that: The other end of the water inlet pipe is a closed end.

14. An electric water heater, characterized in that: A water inlet pipe assembly as described in any one of claims 1 to 13 is used.

15. The electric water heater according to claim 14, characterized in that: It comprises an inner tank, the water inlet pipe assembly is arranged at the bottom of the inner tank cavity, and the straight section extends along the bottom wall of the inner tank.

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