Internal circulation soft water heater

Abstract

The utility model discloses an internal circulation water softening water heater which comprises a hot water device, a water inlet pipeline, a water outlet pipeline, a water return branch pipe, a water softening device, a water storage piece and a shell, the hot water device comprises a heating piece and a heat exchanger, a first water inlet end of the water inlet pipeline is communicated with an external water supply pipe, and a first water outlet end of the water inlet pipeline is communicated with the heat exchanger. The second water outlet end of the water outlet pipeline communicates with an external water outlet assembly, the water return branch pipe is arranged between the water inlet pipeline and the water outlet pipeline, the water softening device is arranged on the water inlet pipeline or the water outlet pipeline, the water storage part is arranged on the water inlet pipeline or the water outlet pipeline, and the heating part and the heat exchanger are sequentially arranged on one side in the shell in the longitudinal direction. The water softening device is longitudinally arranged on the other side in the shell, the water storage piece is arranged between the heat exchanger and the water softening device, and the amp is heated through longitudinal layout; the heat exchanger and the water softening device are arranged on the two sides of the shell, the water storage piece is arranged in the middle, the layout of large-size components is reasonably optimized, and meanwhile the rigidity of the water heater is kept.

Description

Technical Field

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

[0002] In existing water heater designs, a hot water unit and a water softening unit are typically included. The heating unit, as the core functional component of the water heater, mainly consists of a heating element and a heat exchanger. To ensure heating efficiency, both the heating element and the heat exchanger generally have considerable size. The water softening unit, as an important component for improving water quality and preventing scale formation, often occupies a significant amount of space in existing water heaters. The unreasonable layout of the hot water and water softening units in current water heater technology not only increases the size of the water heater but also limits its installation and usage scenarios. Utility Model Content

[0003] In order to overcome at least one of the defects of the prior art, the present invention provides an internal circulation soft water water heater, which can solve the problem of unreasonable layout of hot water device and soft water device.

[0004] The technical solution adopted by this utility model to solve its problem is:

[0005] An internal circulation soft water water heater, comprising:

[0006] A hot water device, comprising a heating element and a heat exchanger, wherein the heating element is disposed on one side of the heat exchanger and is used to provide heat energy to the heat exchanger;

[0007] The water inlet pipe has a first water inlet end and a first water outlet end at its two ends, respectively. The first water inlet end is connected to an external water supply pipe, and the first water outlet end is connected to the heat exchanger.

[0008] The water outlet pipe has a second water inlet and a second water outlet at its two ends, respectively. The second water inlet is connected to the heat exchanger, and the second water outlet is connected to an external water outlet assembly.

[0009] A return water branch pipe, one end of which is connected to the first inlet end and the first outlet end of the inlet pipe, and the other end of which is connected to the second inlet end and the second outlet end of the outlet pipe. The return water branch pipe is provided with a first valve for controlling the opening or closing of the circulation between the inlet pipe, the heat exchanger, the outlet pipe and the return water branch pipe.

[0010] A water softening device, wherein the water softening device is installed on the inlet pipe or the outlet pipe;

[0011] A water storage member is arranged on the water inlet pipeline or the water outlet pipeline to store hot water.

[0012] The housing, the heating member and the heat exchanger are sequentially arranged on one side of the housing, the soft water device is arranged on the other side of the housing, the water storage member is arranged between the heat exchanger and the soft water device, the first water inlet end extends to the outside of the housing, the second water outlet end extends to the outside of the housing, and the water return branch pipe is located in the housing.

[0013] By adopting the above scheme, the heating device and the soft water device are arranged on two sides of the housing in parallel, so that the heating device and the soft water device with large volume are reasonably arranged, the water storage member is arranged in the middle of the housing, on one hand, the water storage member itself has a certain volume and needs to occupy a certain space, and the arrangement between the heating device and the soft water device increases the rationality of the arrangement, on the other hand, the water storage member is arranged in the middle of the housing as a component with smaller volume than the heating device and the soft water device, and does not affect the rigidity of the whole water heater.

[0014] In addition, by additionally arranging the water return branch pipe and the water storage member, an internal circulation system is formed, when the water heater is turned off, the residual hot water can be returned to the water storage member through the water return branch pipe, a part of the hot water in the heat exchanger can be preheated and reheated to be stored in the water storage member, so that when the water heater is turned on again, that is, during the pre-cleaning and ignition of the fan, the hot water stored in the water storage member is used for preferential supply, thereby avoiding the unstable phenomenon that the water temperature is first heated and then cooled, and improving the user experience.

[0015] By adjusting the first valve on the water return branch pipe, the opening or closing of the circulation between the water inlet pipeline, the heat exchanger, the water outlet pipeline and the water return branch pipe can be controlled, and the structure is relatively simple, which is convenient for users to install, use and maintain.

[0016] Further, the soft water device comprises a resin tank, a water inlet pipe and a water outlet pipe, one end of the water inlet pipe is connected with the resin tank, the other end is connected to the water inlet pipeline, one end of the water outlet pipe is connected with the resin tank, the other end is connected with the water inlet pipeline, the resin tank is arranged in the housing in a longitudinal direction, and is arranged opposite to the heating member and the heat exchanger on two sides of the housing, a three-way valve is arranged at the connection between the water inlet pipe and the water inlet pipeline, or a three-way valve is arranged at the connection between the water outlet pipe and the water inlet pipeline, to control whether the water inlet pipeline flows into the resin tank, and the three-way valve is located in the middle of the housing.

[0017] By adopting the above scheme, the resin tank is longitudinally arranged on one side inside the outer casing and opposite to the heating element and heat exchanger, making the water heater more compact overall. The three-way valve is a component of a certain size, and it and the water storage component are both located in the middle of the outer casing, which can make full use of the space between the heating device and the resin tank, improving the space utilization rate inside the outer casing.

[0018] In addition, the resin tank is connected to the water inlet pipe via inlet and outlet pipes. A three-way valve is installed at the connection points between the inlet and outlet pipes, or between the outlet and inlet pipes. This three-way valve allows users to select the water flow path according to their needs: water can flow directly from the first inlet to the first outlet, or it can first be softened by a water softener before flowing to the first outlet, thus providing users with more options.

[0019] Furthermore, a water pump is provided on the inlet pipe or the outlet pipe.

[0020] By adopting the above solution, the water pump can provide additional power to the water flow, ensuring that the water can pass smoothly through the inlet pipe, heat exchanger, outlet pipe and return branch pipe, so that the hot water unit no longer depends on external water pressure and improves the applicability.

[0021] Furthermore, the water pump is located in the middle of the housing, and the water storage component, the three-way valve, and the water pump are sequentially located in the middle of the housing along the vertical direction.

[0022] By adopting the above scheme, the water pump, which is also a component of a certain size, is located in the middle of the outer casing along with the water storage component and the three-way valve. This allows for full utilization of the space between the heating device and the resin tank, thereby improving the space utilization rate inside the outer casing.

[0023] Furthermore, it also includes a salt tank assembly disposed on the bottom side inside the housing.

[0024] By adopting the above solution, since the salt tank needs to be disassembled for salt replenishment, it is located on the bottom side of the outer casing, which makes it convenient for users to disassemble the salt tank.

[0025] Furthermore, the salt tank assembly includes a plurality of salt tanks arranged side by side along the bottom of the outer casing.

[0026] By adopting the above solution, multiple salt tanks significantly increase the total salt storage capacity, thereby substantially reducing maintenance frequency and time. The side-by-side arrangement of multiple salt tanks allows the salt tank assembly to better fit into the space at the bottom of the housing, making full use of the available area within the housing and improving space utilization.

[0027] Furthermore, the salt tank assembly also includes a salt valve, which is located on the bottom side inside the housing and is arranged side by side with the salt tank.

[0028] By adopting the above scheme, the existence of the salt valve enables the user or the control system to accurately control the regeneration process of the soft water device.

[0029] Further, the heating element is a burner, the burner is arranged below the heat exchanger, an upper portion of the burner is provided with a fume hood, one side of the fume hood is provided with an exhaust port, and the exhaust port extends out of the shell.

[0030] Further, the burner is located in a vertical projection plane of the fume hood, and the fume hood, the heat exchanger and the burner are sequentially arranged on one side of the shell in the vertical direction.

[0031] Further, a fan is further arranged below the burner.

[0032] In summary, the soft water heater with the inner circulation provided by the utility model has the following technical effects:

[0033] 1. The heating device and the soft water device are arranged on two sides of the shell in parallel, and the water storage element is arranged in the middle of the shell, so that the heating device and the soft water device are reasonably arranged, and the water storage element is arranged in the middle of the shell, which does not affect the rigidity of the whole water heater.

[0034] 2. The inner circulation system is formed by adding the backwater branch pipe and the water storage element, so that the residual hot water can be returned to the water storage element through the backwater branch pipe when the water heater is turned off, and a part of the hot water in the heat exchanger can be preheated and reheated to be stored in the water storage element, so that the stored hot water in the water storage element can be used for priority supply when the water heater is turned on again, that is, during the cleaning and ignition process before the fan, thereby avoiding the unstable phenomenon that the water temperature is first hot and then cold, and improving the user experience.

[0035] 3. The first valve on the backwater branch pipe can control the opening or closing of the circulation among the water inlet pipe, the heat exchanger, the water outlet pipe and the backwater branch pipe, and the structure is relatively simple, which is convenient for the user to install, use and maintain. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a three-dimensional structure schematic diagram of the utility model;

[0037] Figure 2 It is the inside structure schematic view of the shell of the utility model;

[0038] Figure 3 It is the first visual angle structure schematic view of the hidden burner state of the utility model;

[0039] Figure 4 It is the second visual angle structure schematic view of the hidden burner state of the utility model.

[0040] Wherein, the sign meaning as follows: 11, heating piece;12, heat exchanger;13, smoke hood;14, smoke outlet;15, fan;2, water inlet pipeline;21, first water inlet end;22, first water outlet end;3, water outlet pipeline;31, second water inlet end;32, second water outlet end;4, backwater branch;41, first valve;5, water storage piece;61, resin tank;62, water inlet pipe;63, water outlet pipe;64, three-way valve;65, salt tank;66, salt valve;7, shell;8, water pump. DETAILED DESCRIPTION

[0041] In order to better understand and implement, the following will be combined with the drawings of the utility model, the technical scheme in the embodiment of the utility model is clearly and completely described and discussed, obviously, only a part of the examples described here, not all examples, based on the examples in the utility model, all other examples obtained by the person skilled in the art without making creative efforts, belong to the protection scope of the utility model.

[0042] In order to facilitate the understanding of the embodiment of the utility model, the following will be combined with the drawings to explain and describe the specific embodiment further, and each embodiment does not constitute the limitation of the embodiment of the utility model.

[0043] In the description of the utility model, it is necessary to explain that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as the limitation of the utility model.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing the specific embodiments, and are not intended to limit the utility model.

[0045] ReferenceFigures 1-4 The utility model discloses a kind of inner circulation soft water water heaters, including hot water device, water inlet pipeline 2, water outlet pipeline 3, backwater branch pipe 4, soft water device, water storage 5 and shell 7, hot water device includes heating element 11 and heat exchanger 12, heating element 11 is located in the side of heat exchanger 12, for heat exchanger 12 provides heat energy.Water inlet pipeline 2 two ends are first water inlet end 21 and first water outlet end 22 respectively, first water inlet end 21 is communicated with external water supply pipe, and first water outlet end 22 is communicated with heat exchanger 12.Second water inlet end 31 and second water outlet end 32 are respectively at the two ends of water outlet pipeline 3, second water inlet end 31 is communicated with heat exchanger 12, and second water outlet end 32 is communicated with external water outlet component.One end of backwater branch pipe 4 is communicated between first water inlet end 21 and first water outlet end 22 of water inlet pipeline 2, and the other end is communicated between second water inlet end 31 and second water outlet end 32 of water outlet pipeline 3, first valve 41 is equipped on backwater branch pipe 4, to control the opening or closing circulation between water inlet pipeline 2, heat exchanger 12, water outlet pipeline 3 and backwater branch pipe 4.Soft water device is located on water inlet pipeline 2 or water outlet pipeline 3.Water storage 5 is located on water inlet pipeline 2 or water outlet pipeline 3, to store hot water.Heating element 11 and heat exchanger 12 are sequentially located in the side of the inside of shell 7 along longitudinal direction, and soft water device is longitudinally located in the other side of the inside of shell 7, and water storage 5 is located between heat exchanger 12 and soft water device, first water inlet end 21 extends to the outside of shell 7, second water outlet end 32 extends to the outside of shell 7, and backwater branch pipe 4 is located in the inside of shell 7.

[0046] Specifically, heating element 11 and heat exchanger 12 are sequentially located in the side of the inside of shell 7 along longitudinal direction, to ensure that heat can be efficiently transferred to water.Heating element 11 is located below to directly heat heat exchanger 12, improving thermal efficiency.Soft water device is longitudinally located in the other side of the inside of shell 7, effectively removing calcium and magnesium ions in water, preventing scale formation, protecting pipes and equipment, and prolonging service life.Water storage 5 is located between heat exchanger 12 and soft water device, for storing hot water after preheating or heating, to ensure that users can obtain hot water with stable temperature in time.Backwater branch pipe 4 and first valve 41 can keep hot water circulating inside the system when hot water is not used by setting backwater branch pipe 4 and first valve 41, reducing the time and water volume of cold water discharged before each use of hot water, and improving the utilization rate of hot water and user comfort.All main components (such as heating element 11, heat exchanger 12, soft water device, water storage 5) of shell 7 are arranged in the inside of shell 7, and first water inlet end 21 of water inlet pipeline 2 and second water outlet end 32 of water outlet pipeline 3 are extended to the outside of shell 7, facilitating the connection of external water supply and drainage system.

[0047] The heating element 11 and the heat exchanger 12 are sequentially arranged on one side of the inside of the shell 7 in the longitudinal direction, and the water softening device is arranged on the other side of the inside of the shell 7 in the longitudinal direction. This parallel layout effectively utilizes the space, ensures that the relatively large heating device and the water softening device can be reasonably arranged, and maintains the overall compactness of the equipment. The water storage element 5 is arranged in the middle of the shell 7. On the one hand, it needs to occupy a certain space due to its own size, and the arrangement between the heating device and the water softening device increases the rationality of the layout. On the other hand, as a relatively small component, the water storage element 5 located in the middle does not affect the rigidity of the whole water heater, ensuring the stability and safety of the structure.

[0048] In addition, by adding the return water branch pipe 4 and the water storage element 5 to form an internal circulation system, when the water heater is turned off, the residual hot water can be returned to the water storage element 5 through the return water branch pipe 4 for storage. In addition, a part of the hot water can be reheated by the preheating function of the heat exchanger 12 and stored in the water storage element 5. When the water heater is started again, that is, during the pre-cleaning and ignition of the fan 15, the hot water stored in the water storage element 5 is preferentially used for supply, avoiding the unstable phenomenon that the water temperature becomes hot first and then cold, and significantly improving the user experience.

[0049] And by adjusting the first valve 41 on the return water branch pipe 4, the user can easily control the opening or closing of the circulation between the water inlet pipe 2, the heat exchanger 12, the water outlet pipe 3 and the return water branch pipe 4. This design is simple in structure, easy to install, use and maintain, and provides a user with an efficient and easy-to-manage hot water solution.

[0050] It should be noted that the water softening device can choose to store waste water in a built-in storage element, and then discharge it manually or automatically, or directly discharge it, which is not limited here.

[0051] Referring to Figures 2-4 In some embodiments, the water softening device includes a resin tank 61, a water inlet pipe 62 and a water outlet pipe 63. One end of the water inlet pipe 62 is connected to the resin tank 61, and the other end is connected to the water inlet pipe 2. One end of the water outlet pipe 63 is connected to the resin tank 61, and the other end is connected to the water inlet pipe 2. The resin tank 61 is arranged in the shell 7 in the longitudinal direction, and is arranged opposite to the heating element 11 and the heat exchanger 12 on both sides of the inside of the shell 7. A three-way valve 64 is arranged at the connection between the water inlet pipe 62 and the water inlet pipe 2, or a three-way valve 64 is arranged at the connection between the water outlet pipe 63 and the water inlet pipe 2, for controlling whether the water inlet pipe 2 flows into the resin tank 61. The three-way valve 64 is located in the middle of the shell 7.

[0052] Specifically, the resin tank 61 is longitudinally arranged on one side inside the shell 7 and is arranged opposite to the heating element 11 and the heat exchanger 12, so that the water heater as a whole is more compact. The three-way valve 64 is a component with a certain volume, which is arranged with the water storage element 5 in the middle of the shell 7, can make full use of the space between the heating device and the resin tank 61, and improve the space utilization rate inside the shell 7. The water inlet pipe 62 of the resin tank 61 is connected to the resin tank 61 at one end and to the water inlet pipe 2 of the water heater at the other end, which is used to introduce water to be softened into the resin tank 61. The water outlet pipe 63 is connected to the resin tank 61 at one end and to the water inlet pipe 2 of the water heater at the other end, which is used to transport the softened water back to the water inlet pipe 2 of the water heater for subsequent heating.

[0053] The three-way valve 64 can be arranged at the connection between the water inlet pipe 62 and the water inlet pipe 2, or at the connection between the water outlet pipe 63 and the water inlet pipe 2. The three-way valve 64 is used to control whether the water in the water inlet pipe 2 flows into the resin tank 61. That is, the three-way valve 64 can be switched to communicate the water inlet pipe 2, and correspondingly, the water bypasses the resin tank 61 and directly enters the heat exchanger 12 for heating; the three-way valve 64 can also be switched to communicate the water inlet pipe 2 with the resin tank 61, and the water flows through the resin tank 61 for softening treatment before flowing into the water inlet pipe 2 for subsequent heating and use.

[0054] As an option, the three-way valve 64 can be an electromagnetic three-way valve 64, which can realize automatic switching of the water path, has fast response speed and accurate control. In the internal circulation soft water water heater, the path of the water flow can be quickly adjusted according to preset conditions or user instructions, i.e., the water is introduced into the resin tank 61 for treatment, or the original water path is maintained unchanged, thereby improving the intelligent level of the overall system. More importantly, the electromagnetic three-way valve 64 has a larger volume, and it is more necessary to be arranged between the heating device and the resin tank 61, which further improves the space utilization rate inside the shell 7.

[0055] Referring to Figures 2-4 In some embodiments, a water pump 8 is arranged on the water inlet pipe 2 or the water outlet pipe 3.

[0056] Specifically, the water pump 8 can be arranged on the water inlet pipe 2 or the water outlet pipe 3. The specific position is usually determined by the design requirements and installation conditions of the water heater. The water pump 8 is used to provide additional power to the water flow, so as to overcome the pipe resistance, lift the water level or accelerate the water flow speed, and ensure that the water can smoothly pass through the water inlet pipe 2, the heat exchanger 12, the water outlet pipe 3 and the return pipe 4.

[0057] More importantly, due to the presence of the water pump 8, the hot water assembly is no longer completely dependent on external water pressure. Correspondingly, the water heater can operate stably under various water pressure conditions, including low water pressure areas or high-rise buildings, greatly expanding the application range of the water heater.

[0058] Referring to Figures 2-4 In some embodiments, the water pump 8 is arranged in the middle part of the shell 7, and the water storage element 5, the three-way valve 64 and the water pump 8 are sequentially arranged in the middle part of the shell 7 in the vertical direction.

[0059] Specifically, the water pump 8 also serves as a component with a certain volume, which is arranged in the middle part of the shell 7 together with the water storage element 5 and the three-way valve 64, so as to fully utilize the space between the heating device and the resin tank 61 and improve the space utilization rate inside the shell 7.

[0060] Referring to Figures 2-4 In some embodiments, the water heater further comprises a salt tank assembly arranged at the bottom side inside the shell 7.

[0061] Specifically, the salt tank assembly is arranged at the bottom side inside the shell 7. This structure fully utilizes the bottom space, avoids occupying the positions of other key components, and maintains the overall structure compact. More importantly, since the container in the salt tank assembly for containing salt needs to be detachable for facilitating salt replenishment, arranging the salt tank assembly at the bottom of the shell 7 corresponds to arranging the container at the bottom of the shell 7, so that the user can also replenish salt under the condition of limited height.

[0062] Referring to Figures 2-4 Further, the salt tank assembly comprises a plurality of salt tanks 65 arranged side by side along the bottom of the shell 7.

[0063] Specifically, the plurality of salt tanks 65 greatly increases the total salt storage capacity, which can significantly reduce the maintenance frequency and time. The side-by-side arrangement of the plurality of salt tanks 65 enables the salt tank assembly to better adapt to the space at the bottom of the shell 7, fully utilize the available area inside the shell 7, and improve the space utilization rate.

[0064] Referring to Figures 2-4 Further, the salt tank assembly further comprises a salt valve 66 arranged at the bottom side inside the shell 7, and the salt valve 66 is arranged side by side with the salt tank 65.

[0065] By adopting the above scheme, the presence of the salt valve 66 enables the user or the control system to accurately control the regeneration process of the water softening device. By adjusting the salt valve 66, the time and amount of brine entering the resin tank 61 can be accurately managed, ensuring the best effect of soft water treatment.

[0066] Referring to Figure 2In some embodiments, the heating element 11 is a burner, which is arranged below the heat exchanger 12, and a smoke hood 13 is arranged above the burner. One side of the smoke hood 13 is provided with a smoke exhaust port 14, which extends out of the outer shell 7.

[0067] Specifically, the burner is located below the heat exchanger 12, and the flame directly heats the heat exchanger 12 upward. This vertical layout ensures that heat can be most effectively transferred to water, improving heating efficiency. Due to the natural law of heat rising, this way can make full use of the heat generated by combustion and reduce heat loss. Placing the burner below the heat exchanger 12 and cooperating with the design of the smoke hood 13 makes the entire heating system more compact in the longitudinal space, thereby improving the space utilization rate inside the outer shell 7. The smoke exhaust port 14 extends out of the outer shell 7, promoting air circulation and helping to maintain the oxygen supply required for combustion. Good ventilation conditions ensure the stability of the combustion process, reducing the possibility of incomplete combustion, thereby improving combustion efficiency and reducing pollutant emissions.

[0068] Referring to Figure 2 In some embodiments, the water heater further comprises a fan 15 arranged below the burner.

[0069] Specifically, the fan 15 enhances combustion efficiency and thermal efficiency by providing a stable air supply, ensuring that gas and air are fully mixed, promoting complete combustion, reducing the generation of pollutants, and improving the stability of the flame and the uniformity of heat transfer. In addition, the fan 15 accelerates the preheating speed, shortens the time for the water heater to reach the working temperature, and makes the user obtain hot water faster. Secondly, the fan 15 improves exhaust gas emission, effectively captures and guides high-temperature flue gas to be discharged, reduces the risk of condensate formation, protects the internal structure of the equipment, and prolongs the service life. The presence of the fan 15 also improves safety performance, prevents backfire and blowout phenomena, ensures sufficient oxygen supply before each ignition, and continuously monitors the combustion state during operation.

[0070] The technical means disclosed in the utility model scheme are not limited to the technical means disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for ordinary technical personnel in the technical field, without departing from the principles of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also considered within the protection scope of the utility model.

Claims

1. An internal circulation soft water water heater, characterized in that, include: A hot water device, comprising a heating element (11) and a heat exchanger (12), wherein the heating element (11) is disposed on one side of the heat exchanger (12) and is used to provide heat energy to the heat exchanger (12); Water inlet pipe (2), the two ends of the water inlet pipe (2) are a first water inlet end (21) and a first water outlet end (22), the first water inlet end (21) is connected to an external water supply pipe, and the first water outlet end (22) is connected to the heat exchanger (12); The water outlet pipe (3) has a second water inlet (31) and a second water outlet (32) at its two ends. The second water inlet (31) is connected to the heat exchanger (12), and the second water outlet (32) is connected to the external water outlet assembly. A return water branch pipe (4) is provided, one end of which is connected to the first inlet end (21) and the first outlet end (22) of the inlet pipe (2), and the other end is connected to the second inlet end (31) and the second outlet end (32) of the outlet pipe (3). A first valve (41) is provided on the return water branch pipe (4) to control the opening or closing of the circulation between the inlet pipe (2), the heat exchanger (12), the outlet pipe (3) and the return water branch pipe (4). A water softening device is installed on the inlet pipe (2) or the outlet pipe (3); Water storage device (5), which is provided on the water inlet pipe (2) or the water outlet pipe (3) for storing hot water; The outer shell (7), the heating element (11) and the heat exchanger (12) are arranged longitudinally on one side inside the outer shell (7), the water softener is arranged longitudinally on the other side inside the outer shell (7), the water storage element (5) is arranged between the heat exchanger (12) and the water softener, the first water inlet (21) extends to the outside of the outer shell (7), the second water outlet (32) extends to the outside of the outer shell (7), and the return water branch pipe (4) is located inside the outer shell (7).

2. The internal circulation soft water water heater according to claim 1, characterized in that, The water softening device includes a resin tank (61), an inlet pipe (62), and an outlet pipe (63). One end of the inlet pipe (62) is connected to the resin tank (61), and the other end is connected to the inlet pipeline (2). One end of the outlet pipe (63) is connected to the resin tank (61), and the other end is connected to the inlet pipeline (2). The resin tank (61) is arranged longitudinally inside the outer shell (7) and is positioned opposite to the heating element (11) and the heat exchanger (12) on both sides inside the outer shell (7). A three-way valve (64) is provided at the connection between the inlet pipe (62) and the inlet pipeline (2), or a three-way valve (64) is provided at the connection between the outlet pipe (63) and the inlet pipeline (2) to control whether the water inlet pipeline (2) flows into the resin tank (61). The three-way valve (64) is located in the middle of the outer shell (7).

3. The internal circulation soft water water heater according to claim 2, characterized in that, A water pump (8) is installed on the water inlet pipe (2) or the water outlet pipe (3).

4. The internal circulation soft water water heater according to claim 3, characterized in that, The water pump (8) is located in the middle of the outer casing (7), and the water storage component (5), the three-way valve (64) and the water pump (8) are arranged in the middle of the outer casing (7) in a vertical direction.

5. A recirculating soft water water heater according to claim 1, characterized in that, It also includes a salt tank assembly located on the bottom side inside the housing (7).

6. A recirculating soft water water heater according to claim 5, characterized in that, The salt tank assembly includes a plurality of salt tanks (65) arranged side by side along the bottom of the outer casing (7).

7. A recirculating soft water water heater according to claim 5 or 6, characterized in that, The salt tank assembly also includes a salt valve (66), which is located on the bottom side inside the housing (7) and is arranged side by side with the salt tank (65).

8. A recirculating soft water water heater according to claim 1, characterized in that, The heating element (11) is a burner, which is located below the heat exchanger (12). A smoke hood (13) is provided above the burner, and a smoke exhaust port (14) is provided on one side of the smoke hood (13). The smoke exhaust port (14) extends to the outside of the outer shell (7).

9. A recirculating soft water water heater according to claim 8, characterized in that, The burner is located within the vertical projection plane of the smoke hood (13), and the smoke hood (13), the heat exchanger (12) and the burner are arranged sequentially on one side of the outer shell (7) in the vertical direction.

10. A recirculating soft water water heater according to claim 8 or 9, characterized in that, It also includes a fan (15) located below the burner.

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