Internal circulation soft water heater

Abstract

The utility model discloses an internal circulation soft water heater, a hot water assembly comprises a water inlet pipeline, a heating assembly and a water outlet pipeline which are sequentially connected, the heating assembly comprises a heating piece and a heat exchanger, the heating piece is used for heating the heat exchanger, the internal circulation soft water heater further comprises a water return branch pipe and a water softening device, one end of the water return branch pipe is communicated with the water inlet pipeline, and the other end of the water softening device is communicated with the water outlet pipeline. A first valve is arranged on the water return branch pipe and used for controlling opening or closing of circulation among the water inlet pipeline, the heat exchanger, the water outlet pipeline and the water return branch pipe, and the water softening device is arranged on the water inlet pipeline or the water outlet pipeline and used for softening water. Water flow is controlled to circularly flow among the water inlet pipeline, the heat exchanger, the water outlet pipeline, the water return branch pipe and the water softening device by switching the first valve, so that unfreezing of the components is completed.

Description

TECHNICAL FIELD

[0001] The utility model relates to water heater technical field especially relates to a kind of inner circulation soft water water heater. BACKGROUND

[0002] Water heater is an indispensable household appliance in modern family life, widely used in daily life, and its main function is to provide stable and comfortable hot water supply. Whether for bathing, washing or other life purposes, water heater plays a vital role. However, during long-term use, especially at the position of pipe and valve through which water flows, scaling phenomenon is likely to occur. This is because tap water contains high concentration of hardness ions such as calcium (Ca 2+ ) and magnesium (Mg 2+ ). These ions form calcium carbonate (CaCO3) and magnesium hydroxide (Mg(OH)2) during heating process, and deposit on heat exchanger and other metal surfaces, forming hard scale. With the passage of time, scale accumulation not only reduces the heat efficiency of heat exchanger, increases energy consumption, but also shortens the service life of equipment, and may cause pipe and valve blockage, reduce water flow and affect normal use.

[0003] In addition, in some cold areas or winter, the external temperature may drop below zero Celsius. In such low temperature environment, if the installation position of water heater is exposed or the heat preservation measure is insufficient, the pipe and valve through which water flows are likely to freeze. When water temperature is below freezing point, water will freeze and expand, which will affect hot water supply, and even long-term freezing will cause pipe or pipe to break or deform, thus posing safety hazards. SUMMARY

[0004] To overcome at least one of the above-mentioned defects of the prior art, the utility model provides an inner circulation soft water water heater, which can solve the problem of easy scaling and freezing of water heater.

[0005] During the secondary start-up of the water heater, the water temperature fluctuates greatly and scaling phenomenon occurs at the position of pipe and valve through which water flows.

[0006] The utility model employs the technical scheme to solve the problem:

[0007] The application discloses an internal circulation soft water water heater, which comprises a water inlet pipeline, a heating assembly and a water outlet pipeline, wherein the heating assembly comprises a burner and a heat exchanger, the burner is used for heating the heat exchanger, two ends of the water inlet pipeline are respectively a first water inlet end and a first water outlet end, the first water inlet end is communicated with an external water supply pipe, the first water outlet end is communicated with the heat exchanger, two ends of the water outlet pipeline are respectively a second water inlet end and a second water outlet end, the second water inlet end is communicated with the heat exchanger, and the second water outlet end is communicated with an external water outlet assembly, so that water flowing into the heat exchanger from the water inlet pipeline is discharged through the water outlet pipeline after heat absorption,

[0008] The application further comprises a water return branch pipe and a soft water device, one end of the water return branch pipe is communicated between the first water inlet end and the first water outlet end of the water inlet pipeline, the other end of the water return branch pipe is communicated between the second water inlet end and the second water outlet end of the water outlet pipeline, a first valve is arranged on the water return branch pipe and used for controlling opening or closing of circulation among the water inlet pipeline, the heat exchanger, the water outlet pipeline and the water return branch pipe, and the soft water device is arranged on the water inlet pipeline or the water outlet pipeline.

[0009] By arranging the soft water device on the water inlet pipeline or the water outlet pipeline, water in the water inlet pipeline or the water outlet pipeline can be guided into the soft water device for softening treatment, so that hardness ions (such as calcium and magnesium) in the water are effectively removed, the scaling of internal pipelines, valves and other positions of the water heater is significantly reduced, the thermal efficiency of the water heater is improved, the service life of the equipment is prolonged, and the maintenance cost of the user is reduced.

[0010] When the freezing problem occurs, the water heater is switched to a mode of circulation among the heat exchanger, the water outlet pipeline and the water return branch pipe by adjusting the state of the first valve, in the mode, hot water continuously circulates among the water inlet pipeline, the heat exchanger, the water outlet pipeline and the water return branch pipe, so that the temperature of the water inlet pipeline, the heat exchanger, the water outlet pipeline and the water return branch pipe is effectively improved, and any formed ice block is melted, and in the same way, the water inlet pipeline or the water outlet pipeline can also guide hot water into the soft water device for ice melting in the soft water device, so that the ice melting of the whole pipeline of the water heater is realized.

[0011] Further, the soft water device is connected with a water inlet pipe and a water outlet pipe, one end of the water inlet pipe is connected with the soft water device, the other end of the water inlet pipe is connected to the water inlet pipeline, one end of the water outlet pipe is connected with the soft water device, the other end of the water outlet pipe is connected to the water inlet pipeline, a three-way valve is arranged at the connection position between the water inlet pipe and the water inlet pipeline, or a three-way valve is arranged at the connection position between the water outlet pipe and the water inlet pipeline, so as to control whether the water inlet pipeline flows into the soft water device.

[0012] By adopting the above scheme, the soft water device is connected with the water inlet pipeline through the water inlet pipe and the water outlet pipe. The connection between the water inlet pipe and the water inlet pipeline or the connection between the water outlet pipe and the water inlet pipeline is provided with a three-way valve. The three-way valve can allow the user to select the water flow path according to the actual needs: the water can flow directly from the first water inlet end to the first water outlet end, or flow through the soft water device for softening treatment before flowing to the first water outlet end, thereby providing the user with more choices.

[0013] Further, the three-way valve is an electric three-way valve.

[0014] By adopting the above scheme, the electric three-way valve can realize automatic water path switching, has fast response speed, and has accurate control. In the internal circulation soft water water heater, the water flow path can be quickly adjusted according to a preset condition or a user instruction, that is, the water is introduced into the soft water device for treatment or the original water path is maintained unchanged, thereby improving the intelligent level of the overall system.

[0015] Further, the soft water device is connected with a waste water discharge pipe.

[0016] By adopting the above scheme, the waste water discharge pipe is connected to the soft water device, and accordingly, a waste water storage member does not need to be arranged in the soft water device. The waste water can be directly discharged through the waste water discharge pipe, thereby simplifying the internal structure of the water heater, and further facilitating the miniaturization design of the water heater, so that the water heater is more suitable for the space utilization demand of modern families.

[0017] Further, a water storage member is further arranged on the water inlet pipeline or the water outlet pipeline to store hot water.

[0018] By adopting the above scheme, by additionally arranging the water storage member, the water storage member cooperates with the backflow branch pipe to return the residual hot water to the water storage member when the water heater is turned off, or to heat a part of the hot water in the heat exchanger to store in the water storage member, so that when the water heater is turned on again, that is, during the pre-cleaning and ignition process of the fan, the hot water stored in the water storage member is preferentially supplied, thereby avoiding the unstable phenomenon that the water temperature is first heated and then cooled, and thereby improving the user experience. Further, a one-way valve is further arranged on the backflow branch pipe to make the flow direction of the backflow branch pipe from the side of the backflow branch pipe close to the water outlet pipeline to the side of the backflow branch pipe close to the water inlet pipeline.

[0019] By adopting the above scheme, the one-way valve strictly limits the flow direction of the backflow branch pipe, ensures that the water can only flow from the side close to the water outlet pipeline to the side close to the water inlet pipeline, and thereby avoids the reverse flow phenomenon of the water flow during the working process of the water heater, and ensures the stability and efficiency of the internal circulation system.

[0020] Further, a second valve is arranged on the pipeline between the first water inlet end of the water inlet pipeline and the water inlet pipeline and the water return branch pipeline.

[0021] By adopting the above scheme, the second valve is arranged on the pipeline between the first water inlet end of the water inlet pipeline and the water inlet pipeline and the water return branch pipeline. When it is necessary to close the water source of the entire hot water system, the second valve is only needed to be closed, so that the water flow of the external water supply pipe can be effectively prevented from flowing into the water inlet pipeline, which is convenient for maintenance and emergency treatment, and enhances the safety and convenience of use.

[0022] Further, the burner is arranged below the heat exchanger, and a smoke hood is arranged above the heat exchanger.

[0023] By adopting the above scheme, the burner is arranged below the heat exchanger, so that the heat generated by combustion can be directly and efficiently transferred to the heat exchanger, thereby improving the heating efficiency of hot water. In particular, in a gas burner, the flame burns upward, and the burner is arranged below the heat exchanger, which can more effectively improve the heating efficiency. The smoke hood is arranged above the heat exchanger and corresponds to the burner arranged below the heat exchanger. Generally, waste gas and smoke dust float upward, so that they can be collected through the smoke hood, which is convenient for subsequent discharge or treatment, thereby keeping the combustion chamber clean and well ventilated, which is conducive to the stability and fullness of combustion.

[0024] Further, the hot water assembly further comprises a combustion chamber, the burner and the heat exchanger are arranged in the combustion chamber, and the smoke hood is arranged at the top end of the combustion chamber and used for discharging gas in the combustion chamber to the outside of the combustion chamber.

[0025] By adopting the above scheme, the burner and the heat exchanger are arranged in the combustion chamber, so that the heat generated by combustion can be more directly and effectively transferred to the heat exchanger, thereby improving the heating efficiency of hot water. The design of the combustion chamber and the smoke hood can effectively prevent the flame from overflowing or accidentally contacting combustible materials, thereby reducing the risk of fire and other safety risks. Moreover, the combustion chamber provides a relatively closed environment for combustion, which helps to reduce heat loss and further improve thermal efficiency. In addition, the arrangement of the combustion chamber is also conducive to the guidance of the smoke hood to waste gas and smoke dust, so that the waste gas and smoke dust can be more smoothly discharged, and thus will not accumulate in other positions of the water heater.

[0026] Further, a water pump is arranged on the water inlet pipeline or the water outlet pipeline.

[0027] By adopting the above scheme, the water pump can provide additional power for the water flow, so as to ensure that the water can smoothly pass through the water inlet pipeline, the heat exchanger, the water outlet pipeline and the water return branch pipeline, so that the hot water assembly no longer depends on external water pressure, and the application range is improved.

[0028] Furthermore, the heat exchanger is one or more combinations of finned heat exchangers, plate heat exchangers, coil heat exchangers, and heat pipe heat exchangers.

[0029] By adopting the above solution, users can choose one or more heat exchangers to combine according to different usage scenarios and needs. For example, in situations requiring efficient heat exchange and with limited space, a combination of finned heat exchangers and plate heat exchangers can be selected; in situations requiring handling complex operating conditions and environments, heat pipe heat exchangers can be selected.

[0030] In summary, the internal circulation soft water water heater provided by this utility model has the following technical effects:

[0031] 1. Installing a water softener on the inlet or outlet water pipe allows water to be guided to the softener for softening treatment, effectively removing hardness ions (such as calcium and magnesium) from the water. This significantly reduces scale buildup in the water heater's internal pipes and valves, improves the water heater's thermal efficiency, extends the equipment's lifespan, and reduces the user's maintenance costs.

[0032] 2. When freezing occurs, adjust the state of the first valve to switch the water heater to a circulation mode between the heat exchanger, outlet pipe, and return branch pipe. In this mode, hot water will continuously circulate between the inlet pipe, heat exchanger, outlet pipe, and return branch pipe, which can effectively increase the temperature of the inlet pipe, heat exchanger, outlet pipe, and return branch pipe, thereby melting any formed ice. Similarly, the inlet or outlet pipe can also introduce hot water into the water softener to melt ice within the water softener, thus achieving ice melting of the entire water heater piping.

[0033] 3. By adjusting the first valve on the return water branch pipe, the opening or closing of the circulation between the inlet water pipe, heat exchanger, outlet water pipe and return water branch pipe can be controlled. Its structure is relatively simple and convenient for users to install, use and maintain. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the connection relationship of the internal circulation soft water water heater of this utility model.

[0035] The meanings of the reference numerals in the attached drawings are as follows: 1. Water inlet pipe; 11. First water inlet end; 12. First water outlet end; 21. Burner; 22. Heat exchanger; 3. Water outlet pipe; 31. Second water inlet end; 32. Second water outlet end; 4. Return water branch pipe; 5. Water storage device; 6. Soft water device; 61. Water inlet pipe; 62. Water outlet pipe; 63. Three-way valve; 64. Wastewater discharge pipe; 71. First valve; 72. Check valve; 73. Second valve; 8. Fume hood; 9. Combustion chamber; 10. Water pump. Detailed Implementation

[0036] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described and discussed below with reference to the accompanying drawings. Obviously, what is described here is only a part of the examples of this invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the protection scope of this invention.

[0037] To facilitate understanding of the embodiments of this utility model, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this utility model.

[0038] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] 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 this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0040] See Figure 1 This utility model discloses an internal circulation soft water water heater, including an inlet pipe 1, a heating component, and an outlet pipe 3. The heating component includes a burner 21 and a heat exchanger 22. The burner 21 is used to heat the heat exchanger 22. The two ends of the inlet pipe 1 are a first inlet end 11 and a first outlet end 12, respectively. The first inlet end 11 is connected to an external water supply pipe, and the first outlet end 12 is connected to the heat exchanger 22. The two ends of the outlet pipe 3 are a second inlet end 31 and a second outlet end 32, respectively. The second inlet end 31 is connected to the heat exchanger 22, and the second outlet end 32 is connected to an external outlet component, so that the water flowing into the heat exchanger 22 from the inlet pipe 1 absorbs heat and is discharged through the outlet pipe 3.

[0041] The internal circulation soft water water heater further comprises a backwater branch pipe 4, a water storage member 5 and a soft water device 6. One end of the backwater branch pipe 4 is connected to the first water inlet end 11 and the first water outlet end 12 of the water inlet pipe 1, and the other end is connected to the second water inlet end 31 and the second water outlet end 32 of the water outlet pipe 3. The first valve 71 is arranged on the backwater branch pipe 4 to control the opening or closing of the circulation between the water inlet pipe 1, the heat exchanger 22, the water outlet pipe 3 and the backwater branch pipe 4. The soft water device 6 is arranged on the water inlet pipe 1 or the water outlet pipe 3.

[0042] Specifically, the water inlet pipe 1 is used to introduce water in the external water supply pipe into the water heater. The two ends of the water inlet pipe 1 are respectively the first water inlet end 11 and the first water outlet end 12. The first water inlet end 11 is directly connected to the external water supply pipe to ensure stable water input. The first water outlet end 12 is connected to the heat exchanger 22 in the heating assembly to provide input for the water heating process. The heating assembly comprises a burner 21 and a heat exchanger 22. The burner 21 is responsible for generating heat, and the heat generated by the burner 21 is transferred to the water flowing through the heat exchanger 22, thereby achieving water heating. The water outlet pipe 3 is responsible for discharging the heated hot water from the water heater for user use. The two ends of the water outlet pipe 3 are respectively the second water inlet end 31 and the second water outlet end 32. The second water inlet end 31 is connected to the heat exchanger 22 to receive the heated hot water. The second water outlet end 32 is connected to the external water outlet assembly (such as a shower head, a faucet, etc.) to provide hot water for the user. One end of the backwater branch pipe 4 is connected to the first water inlet end 11 and the first water outlet end 12 of the water inlet pipe 1, and the other end is connected to the second water inlet end 31 and the second water outlet end 32 of the water outlet pipe 3. The first valve 71 is arranged on the backwater branch pipe 4 to control the opening or closing of the circulation. The working principle of the above structure is as follows:

[0043] When the water heater is turned on, the external water supply pipe provides cold water to the water inlet pipe 1. These cold waters are first subjected to softening treatment by the soft water device 6 to reduce the hardness of the water and prevent scaling in the water heater. At the same time, the burner 21 starts to heat the heat exchanger 22. The softened cold water flows into the heat exchanger 22. In the heat exchanger 22, the cold water absorbs heat and warms up to become hot water. The heated hot water flows through the water outlet pipe 3 to the user end, such as a shower head, a faucet, etc., to meet the user's hot water demand.

[0044] When the freezing problem occurs, the water heater is switched to a mode of circulating between the heat exchanger, the water outlet pipeline and the water return branch pipeline by adjusting the state of the first valve, in which mode, the hot water will continuously circulate between the water inlet pipeline, the heat exchanger, the water outlet pipeline and the water return branch pipeline, so as to effectively increase the temperature of the water inlet pipeline, the heat exchanger, the water outlet pipeline and the water return branch pipeline, thereby melting any formed ice block. Similarly, the water inlet pipeline or the water outlet pipeline can also introduce hot water into the water softening device for ice melting in the water softening device, thereby realizing ice melting for the water inlet pipeline, the water outlet pipeline, the water return branch pipeline, the heat exchanger, the water softening device, the first valve and various valves possibly arranged on the water inlet pipeline, the water outlet pipeline and the water return branch pipeline in the water heater.

[0045] It should be noted that the water softening device 6 can select a storage member for storing waste water, and then discharge by manual or automatic discharge, or directly discharge, which is not limited here.

[0046] In some embodiments, the water softening device 6 is connected with a water inlet pipe 61 and a water outlet pipe 62. One end of the water inlet pipe 61 is connected with the water softening device 6, and the other end is connected to the water inlet pipeline 1. One end of the water outlet pipe 62 is connected with the water softening device 6, and the other end is connected to the water inlet pipeline 1. A three-way valve 63 is arranged at the connection between the water inlet pipe 61 and the water inlet pipeline 1, or a three-way valve 63 is arranged at the connection between the water outlet pipe 62 and the water inlet pipeline 1, for controlling whether the water in the water inlet pipeline 1 flows into the water softening device 6.

[0047] Specifically, one end of the water inlet pipe 61 of the water softening device 6 is connected with the water softening device 6, and the other end is connected to the water inlet pipeline 1 of the water heater, which is used to introduce the water to be softened into the water softening device 6. One end of the water outlet pipe 62 is connected with the water softening device 6, and the other end is also connected to the water inlet pipeline 1 of the water heater, which is used to transport the softened water back to the water inlet pipeline 1 of the water heater for subsequent heating use.

[0048] The three-way valve 63 can be arranged at the connection between the water inlet pipe 61 and the water inlet pipeline 1, or arranged at the connection between the water outlet pipe 62 and the water inlet pipeline 1. The three-way valve 63 is used to control whether the water in the water inlet pipeline 1 flows into the water softening device 6. That is, the three-way valve 63 can be switched to be connected to the water inlet pipeline 1, and correspondingly, the water bypasses the water softening device 6 and directly enters the heat exchanger 22 for heating. The three-way valve 63 can also be switched to be connected to the water inlet pipeline 1 and the water softening device 6, and the water flows through the water softening device 6 for softening treatment, and then flows into the water inlet pipeline 1 for subsequent heating and use.

[0049] Further, the three-way valve 63 is an electric three-way valve 63.

[0050] Specifically, the electric three-way valve 63 can realize automatic water path switching, has fast response speed, and accurate control. In the internal circulation soft water water heater, the water path can be quickly adjusted according to preset conditions or user instructions, that is, the water is introduced into the soft water device 6 for treatment, or the original water path is maintained unchanged, thereby improving the intelligent level of the overall system.

[0051] In some embodiments, the soft water device 6 is connected with a waste water discharge pipe 64.

[0052] Specifically, the soft water device 6 is connected with the waste water discharge pipe 64, and accordingly, a waste water storage member does not need to be arranged inside the soft water device 6. The waste water can be directly discharged through the waste water discharge pipe 64, thereby simplifying the internal structure of the water heater, and further facilitating the miniaturization design of the water heater, so that it is more suitable for the space utilization demand of modern families.

[0053] In some embodiments, the water heater further comprises a water storage member 5 arranged on the water inlet pipeline 1 or the water outlet pipeline 3, for storing hot water.

[0054] Specifically, in the use of the water heater, after the water heater is turned off, a certain amount of hot water is usually left in the water pipe. However, the amount of this part of hot water is relatively small. When hot water is needed, the water heater is turned on again. In order to ensure the safety and stability of combustion, the water heater will perform a pre-fan cleaning and ignition process. During this process, the water heater does not immediately start heating, but first removes the residual gas in the combustion chamber, and then ignites the gas. During the pre-fan cleaning to ignition process, since the hot water in the water pipe has been completely discharged, and the cold water newly supplemented into the water pipe has not been heated by the water heater yet, the output water becomes hot first and then cold, causing temperature instability, which affects the user's experience.

[0055] In order to solve the above problem, the water storage member 5 can be arranged on the water inlet pipeline 1 or the water outlet pipeline 3, which is specifically determined according to the design requirements of the water heater. The water storage member 5 is used for storing heated hot water, so as to supply hot water during the pre-fan cleaning and ignition process when the water heater is started again, thereby greatly improving the problem of low water temperature when the water heater is started again. The soft water device 6 is used for softening the water flowing through the soft water device 6, reducing the hardness ions such as calcium and magnesium in the water, preventing the internal scaling of the water heater, and prolonging the service life. The soft water device 6 can be arranged on the water inlet pipeline 1 or the water outlet pipeline 3.

[0056] Working principle of the above structure:

[0057] When the water heater is turned off, in order to keep the water temperature stable and make full use of the residual heat in the heat exchanger 22, the internal circulation system can be started, and the first valve 71 on the return water branch pipe 4 is adjusted to make the hot water flow back to the water storage device 5 from the outlet pipe 3 through the return water branch pipe 4. The water storage device 5 is used to store this part of the backflow hot water for subsequent use.

[0058] As an option, there is also residual heat or heat that has not been fully utilized in the heat exchanger 22. This part of the heat can also be further utilized by circulating heating to heat a part of the backflow water and stored in the water storage device 5, which also helps to improve the energy utilization efficiency.

[0059] When the water heater is turned on again, such as during the pre-cleaning and ignition process of the fan, the internal circulation hot water assembly can preferentially use the hot water stored in the water storage device 5 for supply. Since the hot water in the water storage device 5 has been preheated, the unstable phenomenon of water temperature heating first and then cooling can be avoided. This improves the user experience and enables the user to obtain stable temperature hot water more quickly.

[0060] In addition, using the hot water in the water storage device 5 can also reduce the heating time of fresh cold water at the initial stage of ignition. This helps to improve the response speed of the water heater and further saves energy. In some embodiments, the water heater further comprises a one-way valve 72 arranged on the return water branch pipe 4 to make the flow direction of the return water branch pipe 4 from the side of the return water branch pipe 4 close to the outlet pipe 3 to the side of the return water branch pipe 4 close to the inlet pipe 1.

[0061] Specifically, the one-way valve 72 is arranged on the return water branch pipe 4, which functions to limit the flow direction of the return water branch pipe 4. The one-way valve 72 allows water to flow from the side of the return water branch pipe 4 close to the outlet pipe 3 to the side close to the inlet pipe 1, but prevents reverse flow, thereby assisting the first valve 71 to open and ensuring the flow direction of the internal circulation.

[0062] In some embodiments, a second valve 73 is arranged on the pipeline between the first inlet end 11 of the inlet pipe 1 and the inlet pipe 1 and the return water branch pipe 4.

[0063] Specifically, the second valve 73 is arranged on the pipeline between the first inlet end 11 of the inlet pipe 1 and the inlet pipe 1 and the return water branch pipe 4, which controls the water flow from the external water supply pipe into the water heater. The second valve 73 is used to control the water flow from the external water supply pipe into the water heater. When the second valve 73 is closed, the external water source can be cut off to prevent water from entering the water heater. This is particularly useful when maintaining, cleaning, or repairing the water heater.

[0064] As an option, when the water heater is in the internal circulation mode, the second valve 73 can work in coordination with the first valve 71 on the return water branch 4. By closing the second valve 73 and opening the first valve 71, it can be ensured that the water circulation inside the water heater will not be disturbed by the external water source, so as to achieve more stable and efficient water temperature control.

[0065] And when hot water is not needed, closing the second valve 73 can reduce unnecessary heat loss and water waste, improve the energy utilization efficiency of the water heater. At the same time, it also prevents accidental water flow during the shutdown or maintenance of the water heater.

[0066] In some embodiments, the burner 21 is arranged below the heat exchanger 22, and the smoke hood 8 is arranged above the heat exchanger 22.

[0067] Specifically, the burner 21 is located below the heat exchanger 22, which can ensure that the heat generated by combustion is directly and efficiently transferred to the heat exchanger 22, thereby improving the heating efficiency of hot water. Especially in the gas burner 21, the flame burns upward, and the burner 21 is arranged below the heat exchanger 22, which can more effectively improve the heating efficiency. The smoke hood 8 is arranged above the heat exchanger 22, corresponding to the burner 21 arranged below the heat exchanger 22. Generally, waste gas and smoke will float upwards, so as to be collected through the smoke hood 8, facilitating subsequent discharge or treatment, thereby maintaining the cleanliness and good ventilation of the combustion chamber 9, which is conducive to the stability and fullness of combustion.

[0068] In some embodiments, the water heater further comprises a combustion chamber 9, and the burner 21 and the heat exchanger 22 are both located in the combustion chamber 9, and the smoke hood 8 is located at the top end of the combustion chamber 9 for discharging gas in the combustion chamber 9 to outside the combustion chamber 9.

[0069] Specifically, the burner 21 and the heat exchanger 22 are both arranged in the combustion chamber 9, which can ensure that the heat generated by combustion can be more directly and effectively transferred to the heat exchanger 22, thereby improving the heating efficiency of hot water. The design of the combustion chamber 9 and the smoke hood 8 can effectively prevent the flame from overflowing or accidentally contacting combustible materials, thereby reducing the risk of fire and other safety risks. Moreover, the combustion chamber 9 provides a relatively closed environment for combustion, which helps to reduce heat loss and further improve thermal efficiency. In addition, the arrangement of the combustion chamber 9 is also conducive to the guidance of the smoke hood 8 to the waste gas and smoke, which can be more smoothly discharged, and thus will not accumulate in other positions of the water heater.

[0070] In some embodiments, a water pump 10 is arranged on the water inlet pipeline 1 or the water outlet pipeline 3.

[0071] Specifically, the water pump 10 can be arranged on the water inlet pipeline 1 or the water outlet pipeline 3. The specific position is usually determined by the design requirements and installation conditions of the water heater. The water pump 10 is used to provide additional power for the water flow, so as to overcome the pipeline resistance, lift the water level or accelerate the water flow speed, and ensure that the water can smoothly pass through the water inlet pipeline 1, the heat exchanger 22, the water outlet pipeline 3 and the backwater branch pipe 4.

[0072] More importantly, due to the presence of the water pump 10, 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.

[0073] In some embodiments, the heat exchanger 22 is one or a combination of finned heat exchanger, plate heat exchanger, coil heat exchanger and heat pipe heat exchanger.

[0074] Specifically, the user can select one or more heat exchangers for combined use according to different use scenarios and needs. For example, in the case of limited space and high efficiency heat exchange, a combination of finned heat exchanger and plate heat exchanger can be selected; in the case of complex working conditions and environment, a heat pipe heat exchanger can be selected.

[0075] The technical means disclosed in the utility model scheme is not only limited to the technical means disclosed in the above-mentioned embodiments, but also includes the technical scheme composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, 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, comprising an inlet pipe (1), a heating assembly, and an outlet pipe (3), wherein the heating assembly comprises a burner (21) and a heat exchanger (22), the burner (21) being used to heat the heat exchanger (22), the two ends of the inlet pipe (1) being a first inlet end (11) and a first outlet end (12) respectively, the first inlet end (11) being connected to an external water supply pipe, and the first outlet end (12) being connected to the heat exchanger (22), the two ends of the outlet pipe (3) being a second inlet end (31) and a second outlet end (32) respectively, the second inlet end (31) being connected to the heat exchanger (22), and the second outlet end (32) being connected to an external outlet assembly, so that water flowing into the heat exchanger (22) from the inlet pipe (1) absorbs heat and is then discharged through the outlet pipe (3), characterized in that: It also includes a return water branch pipe (4) and a water softener (6). One end of the return water branch pipe (4) is connected to the first inlet end (11) and the first outlet end (12) of the inlet pipe (1), 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 (71) is provided on the return water branch pipe (4) to control the opening or closing of the circulation between the inlet pipe (1), the heat exchanger (22), the outlet pipe (3) and the return water branch pipe (4). The water softener (6) is provided on the inlet pipe (1) or the outlet pipe (3).

2. The internal circulation soft water water heater according to claim 1, characterized in that, The water softening device (6) is connected to an inlet pipe (61) and an outlet pipe (62). One end of the inlet pipe (61) is connected to the water softening device (6), and the other end is connected to the inlet pipe (1). One end of the outlet pipe (62) is connected to the water softening device (6), and the other end is connected to the inlet pipe (1). A three-way valve (63) is provided at the connection between the inlet pipe (61) and the inlet pipe (1), or a three-way valve (63) is provided at the connection between the outlet pipe (62) and the inlet pipe (1), to control whether the water inlet pipe (1) flows into the water softening device (6).

3. The internal circulation soft water water heater according to claim 2, characterized in that, The three-way valve (63) is an electric three-way valve (63).

4. A recirculating soft water water heater according to any one of claims 1-3, characterized in that, The water softener (6) is connected to a wastewater discharge pipe (64).

5. A recirculating soft water water heater according to any one of claims 1-3, characterized in that, It also includes a water storage device (5), which is installed on the water inlet pipe (1) or the water outlet pipe (3) for storing hot water.

6. A recirculating soft water water heater according to claim 5, characterized in that, It also includes a one-way valve (72), which is installed on the return water branch pipe (4) so ​​that the flow direction of the return water branch pipe (4) is from the side of the return water branch pipe (4) close to the water outlet pipe (3) to the side of the return water branch pipe (4) close to the water inlet pipe (1).

7. A recirculating soft water water heater according to any one of claims 1-3, characterized in that, A second valve (73) is provided on the pipeline from the first inlet end (11) of the inlet pipeline (1) to the pipeline between the inlet pipeline (1) and the return branch pipe (4).

8. A recirculating soft water water heater according to any one of claims 1-3, characterized in that, The burner (21) is located below the heat exchanger (22), and a smoke hood (8) is provided above the heat exchanger (22).

9. A recirculating soft water water heater according to claim 8, characterized in that, It also includes a combustion chamber (9), in which the burner (21) and the heat exchanger (22) are both located, and the smoke hood (8) is located at the top of the combustion chamber (9) to discharge the gas in the combustion chamber (9) to the outside of the combustion chamber (9).

10. A recirculating soft water water heater according to any one of claims 1-3, characterized in that, A water pump (10) is provided on the water inlet pipe (1) or the water outlet pipe (3).

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