Water heating device

Abstract

The utility model discloses a water heating device. The water heating device comprises a main body structure and a heat exchange structure, the main body structure comprises an inner container, a water inlet pipe, a water outlet pipe and a first heating piece, the heat exchange structure comprises a heat exchange piece located in the inner container, and the heat exchange piece can absorb energy from a heat source piece located outside the inner container. According to the water heating device, tap water entering the inner container can be preheated by arranging the heat exchange structure, so that the temperature of the tap water is increased, the energy consumption required by the first heating piece for heating water in the inner container to the set temperature is reduced, and the use cost of the water heating device is reduced. According to the water heating device, at least part of the first heating piece is arranged around the water inlet end of the water outlet pipe in the circumferential direction, so that the temperature of water entering the water outlet pipe rises rapidly, and rapid water outlet is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of water heating equipment, in particular to a water heating device. Background Art

[0002] Existing water heaters are divided into electric water heaters and gas water heaters according to the different energy sources for heating water. Regardless of whether it is an electric water heater or a gas water heater, the energy consumed when heating water is directly related to the initial temperature of the water to be heated. For heating to the same set temperature, the lower the temperature of the tap water entering the water heater, the more electricity or gas is consumed. Especially in winter, the temperature of the tap water itself is relatively low, and the amount of hot water used by users for bathing, washing vegetables, etc. is relatively large, and the water temperature required is also relatively high, which increases the living cost of users and brings a certain economic burden to users.

[0003] How to provide a hot water device with lower use cost is a technical problem that urgently needs to be solved. Utility Model Content

[0004] The utility model aims to provide a water heater, wherein the energy consumption of a first heating element of the water heater is low, so that the use cost of the water heater is reduced.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A hot water device comprises: a main structure, the main structure comprising an inner tank, a water inlet pipe, a water outlet pipe and a first heating element, the water outlet end of the water inlet pipe and the water inlet end of the water outlet pipe both extend into the inner tank, and at least a portion of the first heating element is circumferentially arranged around the water inlet end of the water outlet pipe; a heat exchange structure, the heat exchange structure comprising a heat exchange element located in the inner tank, and the heat exchange element can absorb energy from a heat source element located outside the inner tank.

[0007] Preferably, the main structure further includes a second heating element, which is located in the inner pot and is spaced apart from the first heating element in a depth direction of the inner pot.

[0008] Preferably, the water heater further comprises a first temperature detecting element, which is arranged in the inner tank and is used to detect the water temperature of the water in the inner tank; and / or, the heat exchange element is a heat exchange tube, in which a heat exchange medium flows, and the water heater further comprises a second temperature detecting element, which is used to detect the temperature of the heat exchange medium; and / or, the water heater further comprises a third temperature detecting element, which is arranged at the water inlet end of the water outlet pipe.

[0009] Preferably, the heat exchange structure further comprises a switch structure, and the switch structure is used to open and close the heat exchange between the heat exchange element and the water in the inner tank.

[0010] Preferably, the heat exchange element is a heat exchange tube; the heat exchange structure also includes a medium inlet pipe, one end of which is connected to the inlet of the heat exchange tube, and the other end extends to the outside of the inner tank and is connected to the outlet of the heat source element; the heat exchange structure also includes a medium outlet pipe, one end of which is connected to the outlet of the heat exchange tube, and the other end extends to the outside of the inner tank and is connected to the inlet of the heat source element.

[0011] Preferably, a filter structure is provided in the medium inlet pipe; and / or a second temperature detection element is provided in the medium inlet pipe; and / or a switch structure is provided on the medium outlet pipe.

[0012] Preferably, the heat exchange element is a heat exchange tube in a zigzag or curved shape.

[0013] Preferably, the first heating element is a first electric heating tube, which includes a straight tube section and a threaded tube section connected to each other, wherein one end of the straight tube section away from the threaded tube section is connected to the inner tank, and the threaded tube section is circumferentially arranged around the water inlet end of the water outlet pipe.

[0014] Preferably, the second heating element is a second electric heating tube, and the second electric heating tube has a zigzag structure or an arc structure.

[0015] Preferably, the main structure further comprises an outer shell, which is sleeved outside the inner liner, and a heat-insulating structure is arranged between the outer shell and the inner liner.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides a hot water device including a main structure and a heat exchange structure. The main structure includes an inner tank, an inlet pipe, an outlet pipe and a first heating element. The outlet end of the inlet pipe and the inlet end of the outlet pipe both extend into the inner tank. At least part of the first heating element is arranged circumferentially around the inlet end of the outlet pipe. The heat exchange structure includes a heat exchange element located in the inner tank, and the heat exchange element can absorb energy from a heat source element located outside the inner tank. The hot water device can preheat the tap water entering the inner tank by arranging the heat exchange structure, so that the water temperature of the tap water increases, thereby reducing the energy consumption required by the first heating element to heat the water in the inner tank to the set temperature, which is conducive to reducing the use cost of the hot water device. In addition, the hot water device can quickly increase the temperature of the water entering the outlet pipe by arranging at least part of the first heating element circumferentially around the inlet end of the outlet pipe, which is conducive to achieving rapid water discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is an internal schematic diagram of a water heater provided in an embodiment of the utility model.

[0019] In the figure:

[0020] 10. Main structure; 100. Inner tank; 110. Water inlet pipe; 120. Water outlet pipe; 130. First heating element; 131. Straight pipe section; 132. Threaded pipe section; 140. Second heating element; 150. First temperature detection element; 160. Outer shell; 170. Insulation structure;

[0021] 20. heat exchange structure; 200. heat exchange element; 210. second temperature detection element; 220. medium inlet pipe; 230. medium outlet pipe; 240. filter structure; 250. switch structure. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The utility model provides a water heater, which can heat tap water and output hot water for users. In some embodiments, the water heater is an electric water heater; in some parallel embodiments, the water heater is a gas water heater.

[0026] like Figure 1 As shown, the water heater comprises a main structure 10 and a heat exchange structure 20. The main structure 10 comprises an inner tank 100, a water inlet pipe 110, a water outlet pipe 120 and a first heating element 130. The inner tank 100 is a structure of the water heater for holding water. The water outlet end of the water inlet pipe 110 and the water inlet end of the water outlet pipe 120 both extend into the inner tank 100. The water inlet pipe 110 is used to inject tap water into the inner tank 100. The water outlet pipe 120 is used to discharge the heated water in the inner tank 100. The first heating element 130 is used to heat the water in the inner tank 100. At least part of the first heating element 130 is arranged circumferentially around the water inlet end of the water outlet pipe 120. The water heater arranges at least part of the first heating element 130 circumferentially around the water inlet end of the water outlet pipe 120, so that the water temperature entering the water outlet pipe 120 rises rapidly, which is conducive to achieving rapid water discharge.

[0027] The heat exchange structure 20 includes a heat exchange element 200 located in the inner tank 100, and the heat exchange element 200 can absorb energy from a heat source element located outside the inner tank 100. The water heater can preheat the tap water entering the inner tank 100 by arranging the heat exchange structure 20, so that the water temperature of the tap water is increased, which is beneficial to reduce the energy consumption required by the first heating element 130 to heat the water in the inner tank 100 to the set temperature, and even the first heating element 130 does not need to be started to heat the water in the inner tank to the target temperature, which is beneficial to reduce the use cost of the water heater.

[0028] In some embodiments, the heat exchange element 200 is disposed near the water outlet end of the water inlet pipe 110. By disposing the heat exchange element 200 near the water outlet end of the water inlet pipe 110, the water entering the inner tank 100 can be quickly heated, and the heated water flows upward and mixes with the water located at the upper layer of the inner tank 100. The mixing time is long, which is conducive to improving the balance of the water temperature at the upper layer of the inner tank 100.

[0029] Continue to refer to Figure 1 As shown, in some embodiments, the inner tank 100 is a cylindrical structure with a lateral dimension greater than a vertical dimension. The water inlet pipe 110 is extended in the vertical direction, and the water inlet end of the water inlet pipe 110 is located outside the inner tank 100 and is connected to the tap water source. The water outlet pipe 120 is also extended in the vertical direction, and the water outlet pipe 120 and the water inlet pipe 110 are arranged in parallel and spaced apart in the lateral direction of the inner tank 100. The water outlet end of the water outlet pipe 120 is located outside the inner tank 100 and is connected to an external water-using structure, which can be a faucet, a shower, etc.

[0030] In one embodiment, the length of the water outlet pipe 120 in the vertical direction is greater than the length of the water inlet pipe 110 in the vertical direction, and the water inlet end of the water outlet pipe 120 is arranged close to the inner top wall of the inner tank 100. Since the heated water in the inner tank 100 flows upward, the water inlet end of the water outlet pipe 120 is arranged close to the top wall of the inner tank 100, which can ensure that the water entering the water inlet end of the water outlet pipe 120 is hot water with a relatively high temperature.

[0031] In one embodiment, a plurality of water inlets are arranged on the water outlet pipe 120, and the water inlets are arranged at intervals at the water inlet end of the water outlet pipe 120. Depending on the different arrangement positions of the water inlets on the water outlet pipe 120, the water inlets may be end water inlets and side water inlets.

[0032] In one embodiment, in order to prevent the end of the water outlet pipe 120 from scratching the inner wall of the inner tank 100 during the installation of the water outlet pipe 120, an arcuate surface is formed by curling at the end face of the water inlet end of the water outlet pipe 120, or an anti-scratch sleeve is provided on the water inlet end of the water outlet pipe 120.

[0033] In one embodiment, the water outlet end of the water inlet pipe 110 is arranged close to the inner bottom wall of the inner tank 100, so that the tap water with lower temperature entering the inner tank 100 through the water inlet pipe 110 is located in the lower layer of the inner tank 100, avoiding affecting the temperature balance of the upper hot water.

[0034] Continue to refer to Figure 1 As shown, the first heating element 130 is disposed on the upper layer of the inner tank 100 and is used to heat the tap water located on the upper layer of the inner tank 100. When the temperature of the tap water entering the inner tank 100 after heat exchange with the heat exchange element 200 still does not reach the target temperature, the first heating element 130 can be started to continue to heat the water in the inner tank 100, so that the water finally entering the water outlet pipe 120 can meet the user's usage requirements.

[0035] In some embodiments, the first heating element 130 is a first electric heating pipe, which includes a straight pipe section 131 and a threaded pipe section 132 connected to each other, and the end of the straight pipe section 131 away from the threaded pipe section 132 is connected to the inner tank 100, and the threaded pipe section 132 is arranged circumferentially around the water inlet end of the water outlet pipe 120. Such an arrangement increases the heating area of ​​the first heating element 130, which is conducive to improving the heating efficiency. In one embodiment, the straight pipe section 131 is basically arranged along the lateral extension of the inner tank 100 to improve the uniformity of the water heated by the first electric heating pipe. In one embodiment, the water heater also includes a first mounting member, which is mounted to the inner tank 100 on one side in the lateral direction, and the first electric heating pipe is mounted to the inner tank 100 through the first mounting member. In one embodiment, the first mounting member is a flange member. Of course, in other embodiments, the first heating element 130 can also be a gas heating element formed with a gas burner.

[0036] In some embodiments, a plurality of first electric heating tubes are provided, and the plurality of first electric heating tubes are vertically spaced apart in the inner tank 100 , and the threaded pipe sections 132 of the plurality of first electric heating tubes are segmentedly sleeved on the water outlet pipe 120 , or the threaded pipe sections 132 of the plurality of first electric heating tubes are coaxially sleeved on the water outlet pipe 120 to improve the heating efficiency at the water outlet pipe 120 .

[0037] Continue to refer to Figure 1 As shown, the main structure 10 further includes a second heating element 140, which is located in the inner pot 100, and the second heating element 140 and the first heating element 130 are spaced apart in the depth direction of the inner pot 100. The water heater heats the water in the inner pot 100 through the first heating element 130 and the second heating element 140, which is beneficial to improving the heating efficiency of the water in the inner pot 100.

[0038] In some embodiments, the number of the second heating elements 140 is multiple, and the multiple second heating elements 140 are arranged at intervals in the inner pot 100. In one embodiment, the multiple second heating elements 140 are arranged at intervals in the lateral direction of the inner pot 100; in one embodiment, the multiple second heating elements 140 are arranged at intervals in the vertical direction of the inner pot 100; in one embodiment, the multiple second heating elements 140 are arranged in rows and columns or radially in the inner pot 100.

[0039] In some embodiments, the second heating element 140 is a second electric heating tube, and the second electric heating tube is a fold line structure or an arc structure. It should be noted that the second electric heating tube with an arc structure includes a spirally spiraled coil in the space, and also includes a curved tube in a plane, such as a serpentine tube. Such a setting can increase the heating area of ​​the second electric heating tube, thereby improving the heating efficiency of the water in the inner pot 100. In one embodiment, the second electric heating tube is basically arranged along the lateral extension of the inner pot 100 to improve the uniformity of the water heated by the second electric heating tube. In one embodiment, the second electric heating tube is installed on the inner pot 100 through the first mounting member. By installing both the first electric heating tube and the second electric heating tube on the first mounting member, and then installing the first mounting member on the inner pot 100, it is possible to meet the demand by only opening a hole structure for assembling the first mounting member on the inner pot 100, reducing the number of holes opened on the inner pot 100, which is conducive to improving the structural strength of the inner pot 100.

[0040] Continue to refer to Figure 1As shown, in some embodiments, the water heater further includes a first temperature detection member 150, which is disposed in the inner tank 100 and is used to detect the temperature of the water in the inner tank 100. Using the first temperature detection member 150 to detect the water temperature of the water in the inner tank 100 is conducive to achieving accurate control of the heat exchange structure 20 and the first heating member 130 and the second heating member 140. In one embodiment, the first temperature detection member 150 is a first temperature sensor.

[0041] In one embodiment, a blind hole tube is provided on the first mounting member, the blind hole tube is provided in the inner tank 100, and the first temperature sensor is placed in the blind hole tube. Such a configuration can not only protect the first temperature sensor and prevent the first temperature sensor from being damaged, but also facilitate the installation of the first temperature sensor, thereby reducing the number of holes opened on the inner tank 100. In one embodiment, the blind hole tube is a metal tube, and such a configuration can accelerate the speed at which heat is transferred from water to the first temperature sensor.

[0042] Continue to refer to Figure 1 As shown, the main structure 10 further includes an outer shell 160, which is sleeved outside the inner liner 100, and a heat preservation structure 170 is provided between the outer shell 160 and the inner liner 100. The heat preservation performance of the main structure 10 can be improved by providing the heat preservation structure 170, and heat loss can be reduced.

[0043] The heat exchange structure 20 is used to preheat the water entering the inner tank 100 from the water inlet pipe 110. In some embodiments, the heat exchange element 200 is a heat exchange tube, and a heat exchange medium circulates in the heat exchange tube. The heat exchange medium can be water or other liquids with stable properties. The heat exchange structure 20 also includes a medium inlet pipe 220, one end of which is connected to the inlet of the heat exchange tube, and the other end extends to the outside of the inner tank 100 and is connected to the outlet of the heat source. The heat exchange structure 20 also includes a medium outlet pipe 230, one end of which is connected to the outlet of the heat exchange tube, and the other end extends to the outside of the inner tank 100 and is connected to the inlet of the heat source. A loop for circulating the heat exchange medium can be formed by the heat exchange tube, the medium inlet pipe 220, the medium outlet pipe 230 and the heat exchange element 200, so that the heat exchange medium absorbs heat at the heat source and releases heat at the heat exchange tube.

[0044] In the embodiments of the present application, the heat source component is not limited, and the heat source component can be a heat recovery device capable of recovering waste heat, and the waste heat can come from bath water, air conditioning waste heat, etc. Of course, the heat source component can also be a heat exchange component capable of exchanging heat with a heat generating device. The heat at the heat source component heats the heat exchange medium, so that the temperature of the heat exchange medium increases and flows into the heat exchange tube, thereby achieving heating of the water in the inner tank 100.

[0045] In some embodiments, a filter structure 240 is provided in the medium inlet pipe 220. The filter structure 240 may be a filter screen, a filter element or the like. By providing the filter structure 240, the heat exchange medium can be filtered to prevent impurities in the heat exchange medium from clogging the heat exchange pipe.

[0046] In some embodiments, the heat exchange element 200 is a heat exchange tube in a zigzag or curved shape. Such an arrangement can increase the heat exchange area of ​​the heat exchange element 200 and improve the heat exchange efficiency. It should be noted that the curved heat exchange tube includes a spirally threaded coil in space, and also includes a curved tube in a plane, such as a serpentine tube. In one embodiment, the zigzag or curved heat exchange tube is basically arranged along the lateral extension of the inner tank 100 to improve the uniformity of heating the water in the inner tank 100.

[0047] Continue to refer to Figure 1 As shown, the hot water device also includes a second temperature detection member 210, and the second temperature detection member 210 is used to detect the temperature of the heat exchange medium. Using the second temperature detection member 210 to detect the temperature of the heat exchange medium inside is conducive to achieving accurate control of the heat exchange structure 20 and the first heating member 130 and the second heating member 140. In one embodiment, the second temperature detection member 210 is a second temperature sensor. In one embodiment, the second temperature detection member 210 is arranged in the medium inlet pipe 220, so that the detection accuracy can be improved.

[0048] In some embodiments, the water heater further comprises a third temperature detection member, which is disposed at the water inlet end of the water outlet pipe 120. In one embodiment, the third temperature detection member is a third temperature sensor. By providing the third temperature detection member, the temperature of the water entering the water outlet pipe 120 can be more accurately obtained, thereby determining whether the hot water flowing out of the water outlet pipe 120 has reached the target temperature required by the user.

[0049] In some embodiments, the heat exchange structure 20 further includes a switch structure 250, which is used to open and close the heat exchange between the heat exchange element 200 and the water in the inner tank 100. In one embodiment, the switch structure 250 is a switch valve, and optionally, the switch structure 250 is an electric two-way valve. In one embodiment, the switch structure 250 is arranged on the medium outlet pipe 230, and its position is reasonable and easy to control.

[0050] The working principle of the hot water device is as follows:

[0051] 1. Manually set the target outlet water temperature T0 of the hot water device. The target outlet water temperature T0 can be adjusted between 30°C and 80°C. The initial state of the switch valve is to open the heat exchange tube, and the initial state of the first heating element 130 and the second heating element 140 is to be closed.

[0052] 2. Use the first temperature detection element 150 to detect the current temperature T1 of the water in the inner tank 100 (T1 is less than T0 by default), and use the second temperature detection element 210 to detect the temperature T2 of the heat exchange medium.

[0053] (1) If T1 is less than T2, and TO is less than or equal to T2:

[0054] First, maintain the open state of the switch valve, and maintain the closed state of the first heating element 130 and the second heating element 140, and use the heat exchange structure 20 to preheat the water in the inner tank 100 until T1 is equal to T2; then, according to demand, turn on at least one of the first heating element 130 and the second heating element 140, and use the first heating element 130 and / or the second heating element 140 to heat the water in the inner tank 100 until T1 is equal to T0; finally, turn off and on the first heating element 130 and the second heating element 140, and perform the water outlet operation of the water heater.

[0055] (2) If T1 is greater than or equal to T2, and T1 is less than TO:

[0056] First, switch the switch valve to the closed state to prevent the energy of the hot water in the inner tank 100 from being taken away by the heat exchange medium; then, turn on at least one of the first heating element 130 and the second heating element 140, and use the first heating element 130 and / or the second heating element 140 to heat the water in the inner tank 100 until T1 is equal to T0; finally, turn off and on the first heating element 130 and the second heating element 140, and perform the water outlet operation of the hot water device.

[0057] It should be noted that, in the present application, the heating logic of the first heating element 130 and the second heating element 140 is not limited, and the water can be heated simultaneously, alternately, or separately according to needs.

[0058] In an embodiment of the utility model, the water heating device also includes a control mechanism, which can be a centralized or distributed controller. For example, the controller can be a single single-chip microcomputer, or it can be composed of multiple distributed single-chip microcomputers. The control program can be run in the single-chip microcomputer to control the first heating element 130, the second heating element 140, the switch structure 250, etc. to realize their functions respectively.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A water heating device, characterized in that: include: A main body structure (10), the main body structure (10) comprising an inner tank (100), a water inlet pipe (110), a water outlet pipe (120) and a first heating element (130), the water outlet end of the water inlet pipe (110) and the water inlet end of the water outlet pipe (120) both extending into the inner tank (100), and at least a portion of the first heating element (130) being arranged circumferentially around the water inlet end of the water outlet pipe (120); A heat exchange structure (20), the heat exchange structure (20) comprising a heat exchange element (200) located in the inner tank (100), the heat exchange element (200) being capable of absorbing energy from a heat source element located outside the inner tank (100).

2. The water heater according to claim 1, characterized in that: The main body structure (10) further comprises a second heating element (140), wherein the second heating element (140) is located in the inner pot (100) and is spaced apart from the first heating element (130) in the depth direction of the inner pot (100).

3. The water heater according to claim 1, characterized in that: The water heater further comprises a first temperature detection component (150), wherein the first temperature detection component (150) is arranged in the inner tank (100) and is used to detect the water temperature of the water in the inner tank (100); And / or, the heat exchange element (200) is a heat exchange tube, a heat exchange medium flows in the heat exchange tube, and the water heater further comprises a second temperature detection element (210), and the second temperature detection element (210) is used to detect the temperature of the heat exchange medium; And / or, the water heater further comprises a third temperature detection component, wherein the third temperature detection component is arranged at the water inlet end of the water outlet pipe (120).

4. The water heater according to claim 1, characterized in that: The heat exchange structure (20) further comprises a switch structure (250), wherein the switch structure (250) is used to open and close the heat exchange between the heat exchange element (200) and the water in the inner tank (100).

5. The water heater according to claim 1, characterized in that: The heat exchange element (200) is a heat exchange tube; The heat exchange structure (20) further comprises a medium inlet pipe (220), one end of which is in communication with the inlet of the heat exchange pipe, and the other end of which extends to the outside of the inner tank (100) and is in communication with the outlet of the heat source element; The heat exchange structure (20) further comprises a medium outlet pipe (230), one end of which is connected to the outlet of the heat exchange pipe, and the other end of which extends to the outside of the inner tank (100) and is connected to the inlet of the heat source element.

6. The water heater according to claim 5, characterized in that: A filtering structure (240) is provided in the medium inlet pipe (220); And / or, a second temperature detection element (210) is arranged in the medium inlet pipe (220); And / or, a switch structure (250) is provided on the medium outlet pipe (230).

7. The water heater according to claim 1, characterized in that: The heat exchange element (200) is a heat exchange tube in a zigzag or curved shape.

8. The water heater according to claim 1, characterized in that: The first heating element (130) is a first electric heating tube, the first electric heating tube comprising a straight tube section (131) and a threaded tube section (132) connected to each other, one end of the straight tube section (131) away from the threaded tube section (132) being connected to the inner tank (100), and the threaded tube section (132) being arranged circumferentially around the water inlet end of the water outlet pipe (120).

9. The water heater according to claim 2, characterized in that: The second heating element (140) is a second electric heating tube, and the second electric heating tube is a folded line structure or an arc structure.

10. The water heater according to claim 1, characterized in that: The main body structure (10) further comprises an outer shell (160), wherein the outer shell (160) is sleeved outside the inner liner (100), and a heat-insulating structure (170) is provided between the outer shell (160) and the inner liner (100).

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