An inner circulation hot water assembly and an inner circulation water heater

Abstract

The utility model discloses a kind of inner circulation hot water components and inner circulation water heater, wherein hot water component includes water inlet pipeline, heating assembly and water outlet pipeline connected in turn, heating assembly includes heating piece and heat exchanger, heating piece is used to heat for heat exchanger, further include backwater branch pipe and water storage element, backwater branch pipe one end is communicated to water inlet pipeline, other end is communicated to water outlet pipeline, first valve is equipped on backwater branch pipe, to be used to control opening or close the circulation between water inlet pipeline, heat exchanger, water outlet pipeline and backwater branch pipe, water storage element is located on water inlet pipeline or water outlet pipeline, to be used to store hot water, by additionally providing backwater branch pipe and water storage element, when water heater is closed, utilize backwater branch pipe and make residual hot water backflow to water storage element, to make water heater open again, use the hot water stored in water storage element to carry out preferential supply, to avoid the unstable phenomenon that water temperature is first hot and then cold.

Description

Technical Field

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

[0002] As an indispensable hot water supply device in modern households, the stability of gas water heater performance and the comfort of hot water are crucial to the user experience. However, in actual use, users often encounter a troubling problem: when the water heater is turned on again after the water supply is turned off, the water temperature is initially hot and then cools down, exhibiting significant instability. This temperature fluctuation not only affects the user experience but may also potentially impact the lifespan of the water heater.

[0003] Specifically, after the water supply is turned off, a certain amount of hot water usually remains in the pipes of the water heater. However, this amount of hot water is relatively small. When hot water is needed and the water heater is turned back on, it performs a pre-purge and ignition process to ensure combustion safety and stability. During this process, the water heater does not start heating immediately; instead, it first removes the residual gases in the combustion chamber before igniting the gas. During the pre-purge and ignition process, because the hot water in the pipes has already flowed out, and the newly added cold water has not yet been heated by the water heater, the output water is initially hot and then cools down, leading to unstable temperature and affecting the user experience. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides an internal circulation hot water component and an internal circulation water heater, which can solve the problem of large water temperature fluctuations during the secondary start-up of the water heater.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] An internal circulation hot water system includes an inlet pipe, a heating component, and an outlet pipe. The heating component includes a heating element and a heat exchanger. The heating element heats the heat exchanger. The inlet pipe has a first inlet end and a first outlet end, which are connected to an external water supply pipe and the first outlet end is connected to the heat exchanger. The outlet pipe has a second inlet end and a second outlet end, which are connected to the heat exchanger and the second outlet end is connected to an external outlet component. This allows water flowing into the heat exchanger from the inlet pipe to absorb heat before being discharged through the outlet pipe.

[0007] It also includes a return water branch pipe and a water storage device. One end of the return water branch pipe is connected between the first inlet end and the first outlet end of the inlet water pipe, and the other end is connected between the second inlet end and the second outlet end of the outlet water pipe. The return water branch pipe is provided with a first valve to control the opening or closing of the circulation between the inlet water pipe, the heat exchanger, the outlet water pipe and the return water branch pipe. The water storage device is provided on the inlet water pipe or the outlet water pipe to store hot water.

[0008] By adopting the above solution and adding a return water branch pipe and a water storage device to form an internal circulation system, the residual hot water can be returned to the water storage device through the return water branch pipe when the water heater is turned off. Alternatively, some hot water can be preheated in the heat exchanger and stored in the water storage device. This allows the water heater to be supplied with priority when it is turned on again, that is, during the cleaning and ignition process in front of the fan. This avoids the unstable phenomenon of water temperature being hot at first and then cold, thereby improving the user experience.

[0009] Internal circulation hot water systems improve energy efficiency by recycling hot water, reducing the waste of already heated hot water and stored heat in the heat exchanger.

[0010] 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 easy for users to install, use and maintain.

[0011] Furthermore, it also includes a one-way valve, which is disposed on the return water branch pipe to restrict the flow direction of the return water branch pipe from the side of the return water branch pipe closer to the outlet pipe to the side of the return water branch pipe closer to the inlet pipe.

[0012] By adopting the above scheme, the one-way valve strictly restricts the flow direction of the return water branch pipe, ensuring that water can only flow from the side closer to the outlet pipe to the side closer to the inlet pipe, thereby avoiding the backflow phenomenon that may occur during the operation of the water heater and ensuring the stability and efficiency of the internal circulation system.

[0013] Furthermore, a second valve is provided on the pipeline from the first inlet end of the inlet pipe to the pipeline between the inlet pipe and the return branch pipe.

[0014] By adopting the above scheme, the second valve is located on the pipeline between the first inlet end of the inlet pipe and the return branch pipe. When it is necessary to shut off the water source of the entire hot water system, simply close the second valve to effectively prevent water from the external water supply pipe from flowing into the inlet pipe. This facilitates maintenance and emergency handling, and enhances the safety and convenience of use.

[0015] Furthermore, the heating element is a burner, which is located on one side of the heat exchanger.

[0016] By adopting the above scheme, the burner, acting as the heating element, can directly provide a high-temperature heat source to the heat exchanger. This design ensures that the heat exchanger can absorb heat quickly and effectively, thereby improving heating efficiency. The burner's location on one side of the heat exchanger results in a short and direct heat transfer path, reducing energy loss and improving the overall system's thermal efficiency.

[0017] Furthermore, the burner is located below the heat exchanger, and a smoke hood is provided above the heat exchanger.

[0018] By adopting the above scheme, the burner is located below the heat exchanger, ensuring that the heat generated by combustion is directly and efficiently transferred to the heat exchanger, thereby improving the heating efficiency of hot water. Especially in gas burners, where the flame burns upwards, placing the burner below the heat exchanger further enhances heating efficiency. The fume hood is located above the heat exchanger, corresponding to the burner located below it. General exhaust gases and soot tend to rise, and are collected by the fume hood for subsequent discharge or treatment, thus maintaining cleanliness and good ventilation within the combustion chamber, which is beneficial for combustion stability and completeness.

[0019] Furthermore, the burner is located within the vertical projection plane of the smoke hood.

[0020] By adopting the above-mentioned solution, placing the burner within the vertical projection plane of the fume hood ensures that the flue gas and unburned exhaust gases generated during combustion are more effectively captured and discharged by the fume hood, thereby reducing safety risks such as fires. Furthermore, the fume hood guides the flue gas more smoothly, reducing the possibility of accumulation inside the water heater and further enhancing overall safety.

[0021] Furthermore, it also includes a combustion chamber, in which both the burner and the heat exchanger are located, and the smoke hood is located at the top of the combustion chamber to exhaust the gas inside the combustion chamber to the outside of the combustion chamber.

[0022] By adopting the above scheme, both the burner and heat exchanger are placed within the combustion chamber, ensuring that the heat generated by combustion can be transferred to the heat exchanger more directly and effectively, thereby improving the heating efficiency of the hot water. The design of the combustion chamber and fume hood effectively prevents flame overflow or accidental contact with combustibles, thus reducing safety risks such as fires. Furthermore, the combustion chamber provides a relatively enclosed environment for combustion, helping to reduce heat loss and further improve thermal efficiency. In addition, the placement of the combustion chamber also facilitates the guidance of exhaust gases and soot by the fume hood, allowing them to be discharged more smoothly and preventing their accumulation in other parts of the water heater.

[0023] Furthermore, a water pump is provided on the inlet pipe or the outlet pipe.

[0024] 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.

[0025] Furthermore, the heat exchanger is one or more combinations of finned heat exchangers, plate heat exchangers, coil heat exchangers, and heat pipe heat exchangers.

[0026] 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.

[0027] This utility model also provides an internal circulation water heater, comprising:

[0028] The aforementioned internal circulation hot water component;

[0029] A fan having an air outlet that is oriented toward the burner.

[0030] By adopting the above scheme, the blower's outlet is positioned facing the burner, ensuring the pre-purge process is performed and preventing gas leaks and deflagration. Furthermore, in addition to pre-purge, the blower can regulate airflow within the combustion chamber, ensuring the oxygen content meets combustion requirements.

[0031] In summary, the internal circulation hot water component and internal circulation water heater provided by this utility model have the following technical effects:

[0032] 1. By adding a return water branch pipe and a water storage device, an internal circulation system is formed. When the water heater is turned off, the residual hot water can be returned to the water storage device through the return water branch pipe. Alternatively, some hot water can be preheated in the heat exchanger and stored in the water storage device. When the water heater is turned on again, that is, during the cleaning and ignition process in front of the fan, the hot water stored in the water storage device is used for priority supply, thereby avoiding the unstable phenomenon of water temperature being hot first and then cold, thus improving the user experience.

[0033] 2. The internal circulation hot water system reduces the waste of already heated hot water and the heat stored in the heat exchanger by recycling hot water, thereby improving energy efficiency.

[0034] 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

[0035] Figure 1 This is a schematic diagram of the connection relationship of the internal circulation hot water component of this utility model.

[0036] 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. Heating element; 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 component; 61. First valve; 62. Check valve; 63. Second valve; 7. Smoke hood; 8. Combustion chamber; 9. Water pump; 10. Fan; 101. Air outlet. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] See Figure 1This utility model discloses an internal circulation hot water assembly, including an inlet pipe 1, a heating assembly, and an outlet pipe 3. The heating assembly includes a heating element 21 and a heat exchanger 22. The heating element 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 assembly, 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.

[0042] The internal circulation hot water assembly also includes a return water branch pipe 4 and a water storage device 5. One end of the return water branch pipe 4 is connected between the first inlet end 11 and the first outlet end 12 of the inlet pipe 1, and the other end is connected between the second inlet end 31 and the second outlet end 32 of the outlet pipe 3. A first valve 61 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 storage device 5 is provided on the inlet pipe 1 or the outlet pipe 3 to store hot water.

[0043] Specifically, the first inlet end 11 of the inlet pipe 1 is connected to an external water supply pipe to introduce cold water. The first outlet end 12 is connected to a heat exchanger 22 to send cold water into the heat exchanger 22 for heating. The heating element 21 provides a heat source for the heat exchanger 22 and can be an electric heating element, a gas burner, etc. The heat exchanger 22 uses the heat generated by the heating element 21 to heat the water flowing through it. The second inlet end 31 of the outlet pipe 3 is connected to the heat exchanger 22 to receive the hot water heated by the heat exchanger 22. The second outlet end 32 is connected to an external water outlet assembly to deliver the hot water to the user. The return branch pipe 4 connects the inlet pipe 1 and the outlet pipe 3 to form a circulation loop. The return branch pipe 4 is equipped with a first valve 61 to control the opening or closing of the circulation. The water storage device 5 is installed on the inlet pipe 1 or the outlet pipe 3 to store hot water to cope with temperature fluctuations when hot water demand arises.

[0044] In this embodiment, the water storage device 5 is installed on the water inlet pipe 1, so that hot water can be stored in the water storage device 5. When used, it will pass through the heat exchanger 22 again. If the interval between two uses is short, the heat exchanger 22 will still have a considerable amount of heat, which can provide some heat supplementation for the water flowing through the heat exchanger 22, thereby further reducing the temperature fluctuation of the hot water.

[0045] The working principle of the above structure is as follows:

[0046] When the water heater is turned on, the external water supply pipe provides cold water to the inlet pipe 1. The heating element 21 heats the heat exchanger 22, and the hot water absorbs heat and rises in temperature after flowing into the heat exchanger 22. The heated hot water flows to the user end through the outlet pipe 3 to meet the user's hot water needs.

[0047] When the water heater is turned off, the internal circulation system can be activated. By adjusting the first valve 61 on the return branch pipe 4, hot water can flow back from the outlet pipe 3 through the return branch pipe 4 to the storage container 5 for later use. At the same time, there may still be preheated or incompletely utilized heat remaining in the heat exchanger 22. This heat can also be further utilized through circulation heating to heat a portion of the return water and store it in the storage container 5.

[0048] When the water heater is turned on again, during the cleaning and ignition process in front of the fan 10, the internal circulation hot water component can prioritize the use of the hot water stored in the water storage container 5 for supply, thereby avoiding the unstable phenomenon of water temperature being hot first and then cold, improving the user experience, and also reducing the heating time of fresh cold water at the beginning of ignition, thus improving energy utilization efficiency.

[0049] In some embodiments, the internal circulation hot water assembly further includes a one-way valve 62, which is disposed on the return water branch pipe 4 to limit the flow direction of the return water branch pipe 4 from the side of the return water branch pipe 4 near the outlet pipe 3 to the side of the return water branch pipe 4 near the inlet pipe 1.

[0050] Specifically, the one-way valve 62 is installed on the return water branch pipe 4. Its function is to restrict the flow direction of the return water branch pipe 4. The one-way valve 62 allows water to flow from the side of the return water branch pipe 4 near the outlet pipe 3 to the side near the inlet pipe 1, but prevents reverse flow, thereby assisting the first valve 61 in ensuring the flow direction of the internal circulation when it is opened.

[0051] In some embodiments, a second valve 63 is provided on the pipeline from the first inlet end 11 of the inlet pipe 1 to the pipeline between the inlet pipe 1 and the return branch pipe 4.

[0052] Specifically, the second valve 63 is located on the pipeline between the first inlet end 11 of the inlet pipe 1 and the return branch pipe 4. When it is necessary to shut off the water supply of the entire hot water system, simply close the second valve 63 to effectively prevent water from the external water supply pipe from flowing into the inlet pipe 1. Thus, when repairing or replacing components such as the heat exchanger 22 and the heating element 21, closing the second valve 63 can isolate the inlet pipe 1 and ensure the safety of maintenance personnel.

[0053] In some embodiments, the heating element 21 is a burner, which is located on one side of the heat exchanger 22.

[0054] Specifically, the burner, acting as the heating element 21, directly provides a high-temperature heat source to the heat exchanger 22. This design ensures that the heat exchanger 22 can absorb heat quickly and effectively, thereby improving heating efficiency. The burner's location on one side of the heat exchanger 22 results in a short and direct heat transfer path, reducing energy loss and improving the overall system's thermal efficiency.

[0055] In some embodiments, the burner is located below the heat exchanger 22, and a smoke hood 7 is provided above the heat exchanger 22.

[0056] Specifically, the burner is positioned below the heat exchanger 22, ensuring 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 gas burners, where the flame burns upwards, positioning the burner below the heat exchanger 22 further enhances heating efficiency. The fume hood 7 is positioned above the heat exchanger 22, corresponding to the burner positioned below it. General exhaust gases and soot tend to rise and are collected by the fume hood 7 for subsequent discharge or treatment, thus maintaining cleanliness and good ventilation within the combustion chamber 8, which is beneficial for combustion stability and completeness.

[0057] In some embodiments, the burner is located within the vertical projection plane of the smoke hood 7.

[0058] Specifically, during the combustion process, the flue gas and unburned exhaust gases generated are captured more directly and effectively by the smoke hood 7 as they rise, because the burner is located within the vertical projection plane of the smoke hood 7. This reduces the diffusion of exhaust gases inside or around the water heater, thereby lowering safety risks such as fires.

[0059] Furthermore, the fume hood 7 not only helps capture exhaust gases, but also, through its internal structure and airflow guidance, allows the fumes to be discharged from the water heater more smoothly. This reduces the possibility of fumes accumulating inside the water heater, avoiding potential safety hazards caused by fumes buildup.

[0060] In some embodiments, the internal circulation hot water assembly further includes a combustion chamber 8, in which the burner and heat exchanger 22 are both located, and a smoke hood 7 is located at the top of the combustion chamber 8 to discharge the gas in the combustion chamber 8 to the outside of the combustion chamber 8.

[0061] Specifically, the heat generated by the burner within the combustion chamber 8 can be transferred more directly to the heat exchanger 22, reducing heat loss during the transfer process. Furthermore, the combustion chamber 8 provides a relatively enclosed environment for combustion, further reducing heat dissipation. By minimizing heat transfer to the outside, the water heater can more effectively utilize the heat generated by combustion to heat the water flow. Additionally, the design of the combustion chamber 8 facilitates the guidance of exhaust gases and soot by the fume hood 7, allowing them to be discharged more smoothly and preventing accumulation in other parts of the water heater.

[0062] In some embodiments, a water pump 9 is provided on the inlet pipe 1 or the outlet pipe 3.

[0063] Specifically, the water pump 9 can provide additional power to the water flow, ensuring that the water can pass smoothly through the inlet pipe 1, heat exchanger 22, outlet pipe 3 and return branch pipe 4, so that the hot water unit no longer depends on external water pressure and improves its applicability.

[0064] In some embodiments, the heat exchanger 22 is one or more combinations of finned heat exchangers, plate heat exchangers, coil heat exchangers, and heat pipe heat exchangers.

[0065] Specifically, this allows users to choose one or more heat exchangers to combine for 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 chosen.

[0066] It should also be noted that both the first valve 61 and the second valve 63 can be manually controlled valves or solenoid valves, depending on the requirements, and no limitation is made here.

[0067] This utility model also provides an internal circulation water heater, including a fan 10 and the aforementioned internal circulation water heater assembly. The fan 10 has an air outlet 101, which is oriented toward the burner.

[0068] Specifically, the pre-cleaning function of the fan 10 refers to the process where, before the water heater starts combustion, the fan 10 first blows through the combustion chamber 8 at a certain speed and direction to remove residual gas and air impurities, preventing gas leaks and deflagration, and ensuring the safety of the water heater during startup. In addition to the pre-cleaning function, the fan 10 can also adjust the airflow inside the combustion chamber 8 according to the burner's needs, thereby ensuring airflow and oxygen content, and ultimately ensuring that the oxygen content in the combustion chamber 8 meets the combustion conditions.

[0069] Furthermore, by adding a return water branch pipe 4 and a water storage device 5 to the internal circulation hot water assembly, an internal circulation system is formed. When the water heater is turned off, the return water branch pipe 4 can be used to return the residual hot water to the water storage device 5. Alternatively, the preheating in the heat exchanger 22 can be used to reheat a portion of the hot water and store it in the water storage device 5. This allows the hot water stored in the water storage device 5 to be used preferentially when the water heater is turned on again, that is, during the cleaning and ignition process in front of the fan 10. This avoids the unstable phenomenon of the water temperature being hot first and then cold, thereby improving the user experience.

[0070] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. An internal circulation hot water assembly, comprising an inlet pipe (1), a heating assembly, and an outlet pipe (3), wherein the heating assembly comprises a heating element (21) and a heat exchanger (22), the heating element (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, 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 storage device (5). 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 (61) 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 storage device (5) is provided on the inlet pipe (1) or the outlet pipe (3) to store hot water.

2. The internal circulation hot water assembly according to claim 1, characterized in that, It also includes a one-way valve (62), which is provided on the return water branch pipe (4) to restrict the flow direction of the return water branch pipe (4) from the side of the return water branch pipe (4) near the outlet pipe (3) to the side of the return water branch pipe (4) near the inlet pipe (1).

3. An internal circulation hot water assembly according to claim 1 or 2, characterized in that, A second valve (63) 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).

4. The internal circulation hot water assembly according to claim 1, characterized in that, The heating element (21) is a burner, which is located on one side of the heat exchanger (22).

5. The internal circulation hot water assembly according to claim 4, characterized in that, The burner is located below the heat exchanger (22), and a smoke hood (7) is provided above the heat exchanger (22).

6. The internal circulation hot water assembly according to claim 5, characterized in that, The burner is located within the vertical projection plane of the smoke hood (7).

7. An internal circulation hot water assembly according to claim 5 or 6, characterized in that, It also includes a combustion chamber (8), in which the burner and the heat exchanger (22) are both located, and the smoke hood (7) is located at the top of the combustion chamber (8) to discharge the gas in the combustion chamber (8) to the outside of the combustion chamber (8).

8. The internal circulation hot water assembly according to claim 1, characterized in that, A water pump (9) is provided on the water inlet pipe (1) or the water outlet pipe (3).

9. The internal circulation hot water assembly according to claim 1, characterized in that, The heat exchanger (22) is one or more of the following: finned heat exchanger, plate heat exchanger, coil heat exchanger and heat pipe heat exchanger.

10. An internal circulation water heater, characterized in that, include: The internal circulation hot water assembly according to any one of claims 1-9; A fan (10) having an air outlet (101) facing the burner.

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