Heating core of electric water heater and electric water heater using same

Abstract

The utility model provides an electric water heater heating core and an electric water heater using the same, and the electric water heater heating core comprises a tubular inner container with two closed ends; the normally-open heating piece is arranged in the tubular inner container, and the two ends of the normally-open heating piece penetrate through the two ends of the tubular inner container after the normally-open heating piece extends in the length direction of the tubular inner container; the auxiliary heating piece is arranged in the tubular inner container, the two ends of the auxiliary heating piece penetrate through the two ends of the tubular inner container after the auxiliary heating piece extends in the length direction of the tubular inner container, and a heating water cavity is formed among the tubular inner container, the normally-open heating piece and the auxiliary heating piece; the water inlet assembly comprises a water inlet pipeline communicated with one end part of the tubular inner container; the water outlet assembly comprises a water outlet pipeline communicated with the other end of the tubular inner container and a temperature detection device used for detecting the water outlet temperature of the water outlet pipeline. And the control device is electrically connected with the normally open heating piece, the auxiliary heating piece and the temperature detection device. The stability of the water outlet temperature of the electric water heater can be maintained on the premise of saving energy and reducing consumption.

Description

Technical Field

[0001] The utility model relates to the field of electric water heaters, in particular to a heating core of an electric water heater and an electric water heater using the heating core. Background Art

[0002] Many storage water heaters and instant water heaters on the market are large in size and need to be installed in a specified direction, taking up a large amount of limited and precious space. Secondly, the heating water chamber of the water heater has low water pressure resistance. After long-term use, the heating water chamber is prone to leakage or even cracking due to changes in water pressure and temperature, posing a huge safety hazard and affecting users' ideal needs and enjoyment of a better life.

[0003] At the same time, the heating tube of the existing water heater is usually spirally wound and arranged in the middle of the heating water chamber. This arrangement makes the contact efficiency between the water at the edge of the heating water chamber and the heating tube low, resulting in uneven heating and low heating efficiency, which not only wastes electricity but also causes unstable water outlet temperature.

[0004] The purpose of the present invention is to design an electric water heater heating core and an electric water heater using the same in view of the above-mentioned problems in the prior art. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the utility model provides an electric water heater heating core and an electric water heater using the same, which can effectively solve the problems existing in the above-mentioned prior art.

[0006] The technical solution of the utility model is:

[0007] A heating core of an electric water heater, comprising:

[0008] The tubular liner has two closed ends;

[0009] A normally-on heating element is disposed in the tubular liner and extends along the length direction of the tubular liner, with two ends penetrating through the two ends of the tubular liner;

[0010] At least one auxiliary heating element is disposed in the tubular liner and extends along the length direction of the tubular liner, and the two ends thereof penetrate the two ends of the tubular liner, and a heating water cavity is formed between the tubular liner, the normally-on heating element and the auxiliary heating element;

[0011] A water inlet assembly, comprising a water inlet pipeline connected to one end of the tubular liner;

[0012] A water outlet assembly, comprising a water outlet pipeline connected to the other end of the tubular inner tank, and a temperature detection device for detecting the outlet water temperature of the water outlet pipeline;

[0013] A control device is electrically connected to the normally-on heating element, the auxiliary heating element and the temperature detection device.

[0014] Furthermore, the water inlet assembly also includes a flow detection device arranged on the water inlet pipeline and used to detect the water inlet flow at one end of the tubular inner tank, the control device includes an electrically connected control board and a temperature controller detachably arranged on the outer wall of the tubular inner tank, the normally open heating element and the auxiliary heating element are connected in parallel to the control board respectively, and the flow detection device and the temperature detection device are electrically connected to the control board.

[0015] Furthermore, the tubular liner is arranged in a ring-shaped spiral coil, and the inner diameter of the tubular liner is 10-20 mm and the length is 80 cm-120 cm.

[0016] Furthermore, the two ends of the tubular inner tank are respectively sealed by a first head and a second head, and the two ends of the normally open heating element and the auxiliary heating element are respectively sealed and penetrate the ends of the first head and the second head and then exposed, the water inlet pipe and the water outlet pipe are respectively connected to the sides of the first head and the second head, and the temperature detection device is arranged on the outer wall of the second head and the detection head penetrates into the second head.

[0017] An electric water heater, comprising:

[0018] case;

[0019] The heating core of the electric water heater as described above is arranged in the shell, and the ends of the water inlet pipe and the water outlet pipe away from the tubular inner tank respectively penetrate the side wall of the shell;

[0020] The power supply device is arranged in the shell and is used for supplying power.

[0021] Furthermore, the tubular liner is arranged in a ring-shaped spiral coil and stacked front to back in the shell, the inner circle of the tubular liner forms an installation area and one end is arranged in front of the other end, the water inlet pipe and the water outlet pipe are arranged side by side away from one end of the tubular liner and respectively penetrate downward through the bottom wall of the shell and are exposed, the water inlet pipe is vertically arranged in the installation area and the upper half is bent forward and then folded upward to connect with one end of the tubular liner.

[0022] Furthermore, the water inlet assembly also includes a flow detection device disposed on the water inlet pipeline and used to detect the water inlet flow at one end of the tubular inner tank. The flow detection device is disposed on the lower half of the water inlet pipeline and located in the installation area. The control device includes a control panel disposed on the inner wall of the shell and located in the installation area, and a thermostat detachably disposed on the outer wall of the tubular inner tank and located in the installation area. The temperature detection device and the flow detection device are distributed in an L shape on the outside of the control panel. The control panel and the thermostat are electrically connected. The normally open heating element and the auxiliary heating element are respectively connected to the control panel after being connected in parallel. The flow detection device and the temperature detection device are electrically connected to the control panel.

[0023] Furthermore, the power supply device is arranged on the inner wall of the shell and is located on one side of the outer ring of the tubular inner shell. The inner wall of the shell is also provided with a wire clamp located on one side of the outer ring of the tubular inner shell and below the power supply device. The wire clamp is used to clamp the wires connected to the power supply device.

[0024] Furthermore, the shell includes a rear shell and a front shell with a detachable cover arranged on the front side of the rear shell, and the front wall of the rear shell is provided with a plurality of supporting members which are respectively connected and supported on the rear part of the lower end of the water inlet pipe, the rear part of the other end of the tubular inner tank, the rear part of the water outlet pipe, the rear part of the upper side of the tubular inner tank, and the rear part of the flow detection device.

[0025] Therefore, the utility model provides the following effects and / or advantages:

[0026] 1. The present application forms a heating water chamber between the tubular inner tank, the normally-open heating element and the auxiliary heating element by setting the inner tank of the electric water heater heating core as a tubular inner tank, and coaxially arranging a normally-open heating element and an auxiliary heating element in the tubular inner tank, thereby replacing the traditional columnar heating water chamber with a slender strip-shaped heating water chamber with greater water pressure resistance, thereby increasing the contact area and contact efficiency between the water body in the heating water chamber and the heating element, achieving uniform heating, improving heating efficiency, and improving the utilization rate of electric energy, and can achieve installation at any angle without water backflow or water insufficiency causing the heating element to dry out, thereby improving the installation adaptability of the electric water heater;

[0027] At the same time, when the heating water chamber is fully filled with water, the control device controls the normally open heating element to start heating the water in the heating water chamber, and when the temperature detection device detects that the outlet water temperature of the outlet pipe is low, the control device controls the auxiliary heating element to start auxiliary heating of the water in the heating water chamber. Therefore, when the user is not using the water heater, the water temperature in the heating water chamber can be maintained by heating only with the normally open heating element. When the user uses the water heater and hot water is continuously output, the water temperature in the heating water chamber drops, and the outlet water temperature is low, the auxiliary heating element can be turned on for auxiliary heating to quickly restore the outlet water temperature, thereby maintaining the stability of the outlet water temperature of the electric water heater under the premise of energy saving and consumption reduction.

[0028] 2. The present application adds a flow detection device and a temperature controller. When the flow detection device detects that the heating water chamber is fully filled with water, specifically when the flow detection device detects that the water inlet flow reaches 3.3±0.3L, the control device controls the normally open heating element to start heating the water in the heating water chamber, thereby avoiding the normally open heating element from being damaged due to dry burning or increasing the internal pressure of the heating water chamber. When the temperature detection device detects that the outlet water temperature of the water outlet pipe is low, specifically when the outlet water temperature is lower than 55°C, the control device controls the auxiliary heating element to start auxiliary heating of the water in the heating water chamber, thereby preventing the user from using the water heater and causing the hot water to be constantly supplied. When the water temperature in the output and heating water chamber drops and the outlet water temperature is low, the auxiliary heating element can be turned on for auxiliary heating to quickly restore the outlet water temperature, thereby maintaining the stability of the instant hot water outlet temperature of the electric water heater under the premise of energy saving and consumption reduction; at the same time, when the outlet water temperature is higher than the maximum set value, the thermostat will automatically disconnect the circuit, so that the normally open heating element and the auxiliary heating element stop heating, until the outlet water temperature drops to the safe set value, the thermostat will then connect the circuit, so that the normally open heating element and the auxiliary heating element continue heating, thereby performing high-temperature power-off protection on the heating circuit in the electric heater through the thermostat.

[0029] 3. The inner diameter of the tubular inner tank 1 is 10-20mm and the length is 80cm-120cm, so that the heating water chamber has a certain water storage capacity. When the user does not use the water heater, the heating water chamber stores water and heats the water temperature through the normally-open heating element. When the user uses the water heater, hot water is continuously output, the water temperature in the heating water chamber drops, and the outlet water temperature is low, the auxiliary heating element is turned on for auxiliary heating to quickly restore the outlet water temperature. By integrating the water storage heating method and the instant heating method in the electric heating core, and coordinating the heating control of the normally-open heating element and the auxiliary heating element, the stability of the outlet water temperature of the electric water heater is maintained under the premise of energy saving and consumption reduction.

[0030] 4. The present application arranges the tubular liner in an annular spiral and stacks it front and back in the shell, and forms an installation area on the inner circle of the tubular liner, so that the water inlet pipeline and the water outlet pipeline can be arranged side by side to improve the stability of water inlet and outlet. At the same time, the water inlet pipeline can vertically penetrate the installation area and connect one end of the tubular liner, thereby improving the rationality of the pipeline layout; the flow detection device is arranged at the lower half of the water inlet pipeline and is located in the installation area, the control panel is arranged on the inner wall of the shell and is located in the installation area, the thermostat is detachably arranged on the outer wall of the tubular liner and is located in the installation area, the temperature detection device and the flow detection device are arranged on the outer wall of the tubular liner and are located in the installation area, and the temperature detection device and the flow detection device are arranged on the inner wall of the shell and are located in the installation area. The measuring device is distributed in an L shape on the outside of the control panel, which improves the rationality of the position distribution of the control panel, thermostat, flow detection device and temperature detection device, facilitates the wiring between the above devices, and improves the neatness of the wiring; by arranging the power supply device and the wire clamp side by side on the inner wall of the shell and on the outer ring side of the tubular inner tank, the wiring between the devices in the installation area and the wiring between the devices in the installation area and the power supply device are separated, and the wires connected to the power supply device are fixed by the wire clamp, which improves the neatness and rationality of the wiring distribution in the shell and reduces the difficulty of later maintenance. Furthermore, the above-mentioned structure is set to improve the rationality of the structural distribution of the electric water heater heating core in the electric heater shell.

[0031] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a front structural schematic diagram of the heating core of the electric water heater provided by the utility model.

[0033] Figure 2 This is a rear structural schematic diagram of the heating core of the electric water heater provided by the utility model.

[0034] Figure 3 This is a side structural schematic diagram of the heating core of the electric water heater provided by the utility model.

[0035] Figure 4 This is a front structural schematic diagram of the electric water heater provided by the utility model.

[0036] Figure 5 for Figure 4 Schematic diagram of the structure after removing the front shell.

[0037] Figure 6 for Figure 5 Schematic diagram of the structure after removing the heating core of the electric water heater. DETAILED DESCRIPTION

[0038] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the accompanying drawings:

[0039] refer to Figure 1-3 , a heating core of an electric water heater, comprising:

[0040] The tubular liner 1 has two closed ends; specifically, the tubular liner 1 is made of a copper tube;

[0041] A normally-on heating element 2 is disposed in the tubular liner 1 and extends along the length direction of the tubular liner 1, with both ends penetrating through the two ends of the tubular liner 1;

[0042] At least one auxiliary heating element 3 is arranged in the tubular inner liner 1 and extends along the length direction of the tubular inner liner 1. Both ends of the auxiliary heating element 3 pass through the two ends of the tubular inner liner 1. A heating water cavity is formed between the tubular inner liner 1, the normally-open heating element 2 and the auxiliary heating element 3. Specifically, the normally-open heating element 2 and the auxiliary heating element 3 are both configured as heating tubes. The number of the normally-open heating element 2 is set to one, and the number of the auxiliary heating element 3 is set to one. In other embodiments, the number of the two can be adaptively adjusted according to specific circumstances.

[0043] A water inlet assembly 4, comprising a water inlet pipeline 41 connected to one end of the tubular liner 1;

[0044] The water outlet assembly 5 comprises a water outlet pipe 51 connected to the other end of the tubular inner tank 1, and a temperature detection device 52 for detecting the outlet water temperature of the water outlet pipe 51; specifically, the temperature detection device 52 is configured as a temperature sensor; the outlet water of the water outlet pipe 51 is squeezed out by the water inlet pressure of the water inlet pipe 41, and the consistency of water outlet is achieved only when water is inlet, thereby reducing the pressure inside the heating water chamber;

[0045] The control device 6 is electrically connected to the normally-on heating element 2 , the auxiliary heating element 3 and the temperature detection device 52 .

[0046] The above structure replaces the traditional columnar heating water chamber with a slender strip heating water chamber with greater water pressure resistance, thereby increasing the contact area and contact efficiency between the water in the heating water chamber and the heating element, achieving uniform heating, improving heating efficiency, and improving the utilization rate of electric energy. Moreover, the installation can be realized at any angle without water backflow or water insufficiency causing the heating element to dry out, thereby improving the installation adaptability of the electric water heater.

[0047] At the same time, when the heating water chamber is fully filled with water, the control device 6 controls the normally open heating element 2 to start heating the water in the heating water chamber, and when the temperature detection device 52 detects that the outlet water temperature of the outlet pipe 51 is low, the control device 6 controls the auxiliary heating element 3 to start auxiliary heating of the water in the heating water chamber. Therefore, when the user does not use the water heater, the temperature of the water in the heating water chamber can be maintained by heating only through the normally open heating element 2. When the user uses the water heater and causes the hot water to be continuously output, the water temperature in the heating water chamber drops, and the outlet water temperature is low, the auxiliary heating element 3 can be turned on for auxiliary heating to quickly restore the outlet water temperature, thereby maintaining the stability of the outlet water temperature of the electric water heater under the premise of energy saving and consumption reduction.

[0048] In order to improve the heating stability of the electric water heater, the water inlet component 4 also includes a flow detection device 42 arranged on the water inlet pipeline 41 and used to detect the water inlet flow rate at one end of the tubular inner tank 1. The control device 6 includes an electrically connected control board 61 and a thermostat 62 detachably arranged on the outer wall of the tubular inner tank 1. The normally open heating element 2 and the auxiliary heating element 3 are connected in parallel and respectively connected to the control board 61. The flow detection device 42 and the temperature detection device 52 are electrically connected to the control board 61. Specifically, the flow detection device 42 is set to a Hall sensor, the control board 61 is a control circuit board, and the thermostat 62 refers to a series of automatic control elements that physically deform inside the switch according to the temperature changes of the working environment, thereby producing certain special effects and generating conduction or disconnection actions, also called temperature control switches, temperature protectors, temperature controllers, or simply thermostats.

[0049] The arrangement of the above structure can realize that when the flow detection device 42 detects that the heating water chamber is fully filled with water, specifically when the flow detection device 42 detects that the water inlet flow reaches 3.3±0.3L, the control device 6 controls the normally-open heating element 2 to start heating the water in the heating water chamber, thereby avoiding the normally-open heating element 2 from being damaged due to dry burning or increasing the internal pressure of the heating water chamber; when the temperature detection device 52 detects that the outlet water temperature of the water outlet pipe 51 is low, specifically when the outlet water temperature is lower than 55°C, the control device 6 controls the auxiliary heating element 3 to start auxiliary heating of the water in the heating water chamber, thereby preventing the user from using the water heater and causing the hot water to be continuously supplied. When the water temperature in the output and heating water chamber drops and the outlet water temperature is low, the auxiliary heating element 3 can be turned on for auxiliary heating to quickly restore the outlet water temperature, so as to maintain the stability of the instant hot water outlet temperature of the electric water heater under the premise of energy saving and consumption reduction; at the same time, when the outlet water temperature is higher than the maximum set value, the thermostat 62 will automatically disconnect the circuit, so that the normally open heating element 2 and the auxiliary heating element 3 stop heating, until the outlet water temperature drops to the safety set value, specifically 70°C, and the thermostat 62 will connect the circuit again, so that the normally open heating element 2 and the auxiliary heating element 3 continue heating, thereby performing high-temperature power-off protection on the heating circuit in the electric heater through the thermostat 62.

[0050] In order to reduce the overall volume of the electric heater while meeting the water supply required by the user, the tubular inner liner 1 is arranged in a ring-shaped spiral coil, and the inner diameter of the tubular inner liner 1 is 10-20mm and the length is 80cm-120cm. Preferably, in this embodiment, the inner diameter of the tubular inner liner 1 is 15mm and the length is 100cm. Therefore, the overall volume of the electric heater is reduced by setting the tubular inner tank 1 in a ring-shaped spiral coil, and the length of 100 cm can fully meet the instant heating requirements, and the heating water chamber has a certain water storage capacity. When the user is not using the water heater, the heating water chamber stores water and is heated by the normally-open heating element 2 to maintain the water temperature. When the user uses the water heater, causing hot water to be continuously output, the water temperature in the heating water chamber drops, and the outlet water temperature is low, the auxiliary heating element 3 is turned on for auxiliary heating to quickly restore the outlet water temperature. Therefore, by integrating the water storage heating method and the instant heating method in the electric heating core, and coordinating the heating control of the normally-open heating element 2 and the auxiliary heating element 3, the stability of the outlet water temperature of the electric water heater is maintained under the premise of energy saving and consumption reduction. In other embodiments, the shape of the tubular inner tank 1 can also be set to be spirally coiled in other shapes.

[0051] Specifically, the two ends of the tubular inner tank 1 are respectively sealed by a first head 11 and a second head 12, and the two ends of the normally open heating element 2 and the auxiliary heating element 3 are respectively sealed and penetrate the ends of the first head 11 and the second head 12 and then exposed. The water inlet pipe 41 and the water outlet pipe 51 are respectively connected to the sides of the first head 11 and the second head 12, and the temperature detection device 52 is arranged on the outer wall of the second head 12 and the detection head penetrates into the second head 12.

[0052] refer to Figure 4-6 , an electric water heater, comprising:

[0053] Housing 7;

[0054] The heating core of the electric water heater as described above is arranged in the shell 7, and the ends of the water inlet pipe 41 and the water outlet pipe 51 away from the tubular inner tank 1 respectively penetrate the side wall of the shell 7;

[0055] The power supply device 8 is disposed in the housing 7 and is used for supplying power.

[0056] The arrangement of the above structure has the same technical effect as the heating core of the above electric water heater, and will not be repeated here.

[0057] In order to improve the rationality of the structural distribution of the heating core of the electric water heater in the shell 7, the tubular inner liner 1 is arranged in an annular spiral and stacked in the shell 7, the inner circle of the tubular inner liner 1 forms a mounting area 13 and one end is arranged in front of the other end, the water inlet pipe 41 and the water outlet pipe 51 are arranged side by side away from one end of the tubular inner liner 1 and respectively penetrate downward through the bottom wall of the shell 7 and then exposed, and the water inlet pipe 41 is vertically arranged in the mounting area 13 and the upper half is bent forward and then folded upward to connect with one end of the tubular inner liner 1. Thus, by setting the tubular inner liner 1 in an annular spiral and stacked in the shell 7, and forming the mounting area 13 in the inner circle of the tubular inner liner 1, the water inlet pipe 41 and the water outlet pipe 51 can be arranged side by side to improve the stability of water inlet and outlet, and the water inlet pipe 41 can vertically penetrate the mounting area 13 upward to connect with one end of the tubular inner liner 1, thereby improving the rationality of the pipeline layout.

[0058] In order to further improve the rationality of the structural distribution of the heating core of the electric water heater in the shell 7, the water inlet component 4 also includes a flow detection device 42 arranged on the water inlet pipe 41 and used to detect the water inlet flow at one end of the tubular inner tank 1. The flow detection device 42 is arranged in the lower half of the water inlet pipe 41 and is located in the installation area 13. The control device 6 includes a control board 61 arranged on the inner wall of the shell 7 and located in the installation area 13, and a thermostat 62 detachably arranged on the outer wall of the tubular inner tank 1 and located in the installation area 13. The temperature detection device 52 and the flow detection device 42 are distributed in an L shape on the outside of the control board 61. The control board 61 and the thermostat 62 are electrically connected. The normally open heating element 2 and the auxiliary heating element 3 are connected in parallel and are respectively connected to the control board 61. The flow detection device 42 and the temperature detection device 52 are electrically connected to the control board 61. This improves the rationality of the position distribution of the control board 61, the thermostat 62, the flow detection device 42 and the temperature detection device 52, facilitates the wiring between the above devices, and improves the neatness of the wiring.

[0059] In order to further improve the rationality of the structural distribution of the heating core of the electric water heater in the housing 7, the power supply device 8 is arranged on the inner wall of the housing 7 and located on the outer ring side of the tubular inner tank 1. The inner wall of the housing 7 is also provided with a wire clamp 9 located on the outer ring side of the tubular inner tank 1 and below the power supply device 8. The wire clamp 9 is used to clamp the wires connected to the power supply device 8. Thus, the wiring between the devices in the installation area 13 is distinguished from the wiring between the devices in the installation area 13 and the power supply device 8, and the wires connected to the power supply device 8 are clamped and fixed by the wire clamp 9, which improves the neatness and rationality of the wiring distribution in the housing 7 and reduces the difficulty of later maintenance.

[0060] In order to facilitate the later maintenance of the electric heater, the housing 7 includes a rear housing 71 and a front housing 72 with a detachable cover arranged on the front side of the rear housing 71. The front wall of the rear housing 71 is provided with a plurality of supporting members 73 which are respectively connected and supported on the rear of the lower end of the water inlet pipe 41, the rear of the other end of the tubular liner 1, the rear of the water outlet pipe 51, the upper rear of the tubular liner 1, and the rear of the flow detection device 42. Specifically, the power supply device 8 and the wire clamp 9 are also arranged on the front wall of the rear housing 71. Thus, the heating core of the electric heater is connected and fixed to the rear housing 71 through a plurality of supporting members 73. When repairing, the internal structure of the housing 7 can be fully displayed by disassembling the front housing 72.

[0061] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A heating core of an electric water heater, characterized in that: include: A tubular inner liner (1) with two ends sealed; A normally-on heating element (2) is disposed in the tubular inner liner (1) and extends along the length direction of the tubular inner liner (1) with two ends penetrating through the two ends of the tubular inner liner (1); At least one auxiliary heating element (3) is arranged in the tubular inner liner (1) and extends along the length direction of the tubular inner liner (1) with two ends penetrating through the two ends of the tubular inner liner (1), so that a heating water cavity is formed between the tubular inner liner (1), the normally-on heating element (2) and the auxiliary heating element (3); A water inlet assembly (4), comprising a water inlet pipeline (41) connected to one end of the tubular liner (1); A water outlet assembly (5) comprising a water outlet pipeline (51) connected to the other end of the tubular inner tank (1), and a temperature detection device (52) for detecting the outlet temperature of water from the water outlet pipeline (51); A control device (6) is electrically connected to the normally-on heating element (2), the auxiliary heating element (3) and the temperature detection device (52).

2. The electric water heater heating core according to claim 1, characterized in that: The water inlet assembly (4) further comprises a flow detection device (42) disposed on the water inlet pipeline (41) and used to detect the water inlet flow rate at one end of the tubular inner liner (1); the control device (6) comprises an electrically connected control board (61) and a temperature controller (62) detachably disposed on the outer wall of the tubular inner liner (1); the normally open heating element (2) and the auxiliary heating element (3) are connected in parallel and are respectively connected to the control board (61); the flow detection device (42) and the temperature detection device (52) are electrically connected to the control board (61).

3. The electric water heater heating core according to claim 1, characterized in that: The tubular inner liner (1) is arranged in a ring-shaped spiral coil; the inner diameter of the tubular inner liner (1) is 10-20 mm and the length is 80 cm-120 cm.

4. The electric water heater heating core according to claim 1, characterized in that: The two ends of the tubular liner (1) are respectively sealed by a first end cap (11) and a second end cap (12); the two ends of the normally open heating element (2) and the auxiliary heating element (3) are respectively sealed and penetrate the ends of the first end cap (11) and the second end cap (12) and then exposed; the water inlet pipe (41) and the water outlet pipe (51) are respectively connected to the side of the first end cap (11) and the second end cap (12); the temperature detection device (52) is arranged on the outer wall of the second end cap (12) and the detection head penetrates into the second end cap (12).

5. An electric water heater, characterized in that: include: Housing (7); The heating core of the electric water heater according to any one of claims 1 to 4 is arranged in the shell (7), and the ends of the water inlet pipe (41) and the water outlet pipe (51) away from the tubular inner tank (1) respectively penetrate the side wall of the shell (7); A power supply device (8) is arranged in the housing (7) and is used for supplying power.

6. An electric water heater as claimed in claim 5, characterized in that: The tubular liner (1) is arranged in a circular spiral coil and is stacked front to back in the shell (7); the inner circle of the tubular liner (1) forms a mounting area (13) and one end is arranged in front of the other end; the water inlet pipe (41) and the water outlet pipe (51) are arranged side by side at one end away from the tubular liner (1) and respectively penetrate downward through the bottom wall of the shell (7) and are exposed; the water inlet pipe (41) is vertically arranged in the mounting area (13) and the upper half is bent forward and then folded upward to connect with one end of the tubular liner (1).

7. An electric water heater as claimed in claim 6, characterized in that: The water inlet assembly (4) further comprises a flow detection device (42) arranged on the water inlet pipeline (41) and used to detect the water inlet flow rate at one end of the tubular liner (1); the flow detection device (42) is arranged on the lower half of the water inlet pipeline (41) and located in the installation area (13); the control device (6) comprises a control board (61) arranged on the inner wall of the shell (7) and located in the installation area (13); and a temperature controller (62) detachably arranged on the outer wall of the tubular liner (1) and located in the installation area (13); the temperature detection device (52) and the flow detection device (42) are distributed in an L shape on the outside of the control board (61); the control board (61) and the temperature controller (62) are electrically connected; the normally open heating element (2) and the auxiliary heating element (3) are connected in parallel and are respectively connected to the control board (61); and the flow detection device (42) and the temperature detection device (52) are electrically connected to the control board (61).

8. An electric water heater as claimed in claim 5, characterized in that: The power supply device (8) is arranged on the inner wall of the shell (7) and is located on one side of the outer ring of the tubular inner liner (1). The inner wall of the shell (7) is also provided with a wire clamp (9) located on one side of the outer ring of the tubular inner liner (1) and below the power supply device (8). The wire clamp (9) is used to clamp the wires connected to the power supply device (8).

9. An electric water heater as claimed in claim 7, characterized in that: The shell (7) comprises a rear shell (71) and a front shell (72) which is detachably covered and arranged on the front side of the rear shell (71); a plurality of supporting members (73) are arranged in the front wall of the rear shell (71) and are respectively connected and supported on the rear part of the lower end of the water inlet pipeline (41), the rear part of the other end of the tubular liner (1), the rear part of the water outlet pipeline (51), the rear part of the upper side of the tubular liner (1), and the rear part of the flow detection device (42).

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