Motor home water heater

Abstract

The utility model discloses a motor home water heater which comprises a shell and a zero cold water device, a water outlet connector is arranged on one side of the shell, and a water inlet connector is arranged on the other side of the shell. The zero cold water device comprises a constant-temperature bin and a circulating water pump, the inlet end of the constant-temperature bin communicates with a hot water pipe of the water heater, and the outlet end of the constant-temperature bin communicates with the water outlet connector through a hot water outlet pipe. The water outlet end of the circulating water pump communicates with a cold water pipe of the water heater. The cold water pipe communicates with the water inlet connector through a cold water inlet pipe. The zero cold water device further comprises a water return connector arranged on one side of the shell, and the water inlet end of the circulating water pump is communicated with the water return connector and the hot water outlet pipe through a water return pipe. According to the water heater of the motor home, the distance between the water outlet end of the circulating water pump and the water inlet connector is prolonged, cold and hot water series flow formed in the cold water inlet pipe is avoided, normal use of cold water is not affected, the stability of a water supply system of the motor home is guaranteed, meanwhile, the hot water circulation path is shortened, hot water circulation is improved, and the zero cold water effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to a water heater for a recreational vehicle. Background Art

[0002] In the prior art, in order to use hot water at any time, household water heaters are usually provided with a zero cold water device, which solves the problem of waiting for hot water by returning the released hot water to the water heater for circulation and heating.

[0003] However, the zero cold water device on household water heaters is not suitable for RV water heaters. The reason is that household water heaters rely on sufficient water pressure from tap water, while the water pressure in RVs is usually lower. During the operation of the water heater and the hot water circulation pump, the water pressure of the hot water circulation pump will be higher than the cold water pressure of the RV, resulting in the formation of cold and hot water cross flow in the cold water inlet pipe connected to the cold water inlet, affecting the normal use of cold water, which not only reduces the user experience, but may also have an adverse effect on the efficiency and stability of the RV water supply system. Utility Model Content

[0004] In order to overcome the defects described in the above-mentioned prior art, the utility model provides a motorhome water heater, in which a return water joint is arranged on the same side as a water outlet joint, the water outlet end of a circulating water pump is connected with a cold water pipe, and the cold water pipe is connected with a water inlet joint through a cold water inlet pipe, thereby extending the distance between the water outlet end of the circulating water pump and the water inlet joint. This not only avoids the formation of a cross flow of cold and hot water in the cold water inlet pipe, which affects the normal use of cold water, but also ensures the stability of the water supply system of the motorhome, while also shortening the hot water circulation path, improving the hot water circulation, and ensuring a zero cold water effect.

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

[0006] A recreational vehicle water heater, comprising:

[0007] A shell having a water outlet joint on one side and a water inlet joint on the other side;

[0008] A zero cold water device, comprising a constant temperature chamber and a circulating water pump, wherein the inlet end of the constant temperature chamber is connected to the hot water pipe of the water heater, and the outlet end of the constant temperature chamber is connected to the water outlet joint through a hot water outlet pipe; the outlet end of the circulating water pump is connected to the cold water pipe of the water heater, and the cold water pipe is connected to the water inlet joint through a cold water inlet pipe;

[0009] Wherein, the zero cooling water device also includes a return water joint arranged on one side of the shell, and the water inlet end of the circulating water pump is connected with the return water joint and the hot water outlet pipe through a return water pipe.

[0010] Furthermore, it also includes a heat exchanger, on which the hot water pipe and the cold water pipe are provided;

[0011] The water outlet of the circulating water pump is provided with a first connecting pipe and the first connecting pipe is provided with a one-way valve to prevent water backflow; the cold water pipe is connected with a first three-way pipe, and the first connecting pipe is in communication with the first three-way pipe;

[0012] A second connecting pipe is provided at the water inlet end of the circulating water pump, a second three-way pipe is connected to the return pipe, and the second connecting pipe is communicated with the second three-way pipe.

[0013] Furthermore, a third three-way pipe is connected to the hot water outlet pipe, and a third connecting pipe is connected between the second three-way pipe and the third three-way pipe to connect the hot water outlet pipe, the return pipe and the second connecting pipe.

[0014] Furthermore, a four-way valve is connected to the inlet end of the constant temperature chamber, the hot water pipe is connected to the four-way valve, a pressure relief valve is also connected to the four-way valve, and the pressure relief valve is provided with a drain pipe connected to the outside.

[0015] Furthermore, a three-way ball valve is provided at the outlet end of the constant temperature chamber, and the hot water outlet pipe is connected to the three-way ball valve.

[0016] Furthermore, it also includes a drain valve connected to the four-way valve, which is a mechanical low-temperature antifreeze valve and has a built-in temperature sensing element for detecting water temperature. When the temperature is lower than a specific temperature, the mechanical low-temperature antifreeze valve opens to drain water.

[0017] Furthermore, the cold water inlet pipe is provided with a water flow sensor, a filter drain valve and a first temperature probe for detecting the cold water temperature, and the cold water pipe is connected to the filter drain valve; the hot water pipe is provided with a second temperature probe for detecting the hot water temperature.

[0018] Furthermore, it also includes a controller, the cold water pipe is also provided with a first thermostat, the hot water pipe is also provided with a second thermostat, and the first temperature probe, the second temperature probe, the first thermostat and the second thermostat are all electrically connected to the controller.

[0019] Furthermore, it also includes a burner arranged at the bottom of the heat exchanger, and the air inlet end of the burner is provided with a proportional valve connected thereto;

[0020] The shell is also provided with an air inlet connector, and the air inlet of the proportional valve is communicated with the air inlet connector through a gas pipe.

[0021] Furthermore, it also includes a smoke exhaust component, which includes a smoke exhaust hood and a smoke exhaust pipe. The smoke exhaust hood is arranged on the top of the heat exchanger, and the smoke inlet end of the smoke exhaust hood is connected to the smoke outlet of the heat exchanger, the smoke outlet end of the smoke exhaust hood is connected to the smoke inlet of the smoke exhaust pipe, and the smoke exhaust port of the smoke exhaust pipe is connected to the outside.

[0022] In summary, the utility model has the following technical effects:

[0023] The RV water heater of the utility model realizes that hot water is available at any time by setting a zero cold water device, avoiding the need to drain cold water before hot water can be produced, thereby reducing water resource waste. At the same time, the return water joint is set on the same side as the outlet water joint, and the outlet end of the circulating water pump is connected to the cold water pipe, extending the distance between the outlet end of the circulating water pump and the inlet water joint, which not only avoids the formation of cold and hot water cross flow in the cold water inlet pipe, affecting the normal use of cold water, but also ensures the stability of the RV water supply system, while also shortening the hot water circulation path, improving hot water circulation, and ensuring the zero cold water effect.

[0024] The RV water heater of the utility model provides reliable antifreeze protection for drainage when the ambient temperature is low by arranging a mechanical low-temperature antifreeze valve, thereby ensuring that the water in the water heater can be discharged. At the same time, the mechanical low-temperature antifreeze valve can realize the drainage function at low temperatures without the need for electricity supply, thereby ensuring that the water in the water heater is quickly discharged, and effectively preventing damage to the water pipes and internal structures caused by water freezing under low temperature conditions, thereby improving the reliability of the water heater and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the RV water heater of the utility model;

[0026] Figure 2 It is a structural schematic diagram of the RV water heater of the utility model from another perspective;

[0027] Figure 3 This is a schematic diagram of the internal structure of the RV water heater of the utility model;

[0028] Figure 4 It is a structural schematic diagram of another perspective of the interior of the RV water heater of the utility model;

[0029] Figure 5 It is a schematic diagram of the structure of the circulating water pump in the RV water heater of the utility model;

[0030] Figure 6 This is a schematic diagram of the structure of the RV water heater connected to water supply of the utility model.

[0031] The meanings of the reference numerals are as follows:

[0032] 1. Shell; 11. Water outlet joint; 111. Hot water outlet pipe; 112. Third connecting pipe; 12. Water inlet joint; 121. Cold water inlet pipe; 13. Return water joint; 131. Return water pipe; 14. Air inlet joint; 141. Gas pipe; 15. Wire joint; 2. Heat exchanger; 21. Cold water pipe; 211. First temperature probe; 212. Water flow sensor; 213. Filter drain valve; 22. Hot water pipe; 221. Second temperature probe; 23 , first thermostat; 24, second thermostat; 3, burner; 31, gas distribution rod assembly; 32, proportional valve; 4, circulating water pump; 41, second connecting pipe; 42, first connecting pipe; 421, one-way valve; 5, constant temperature chamber; 51, four-way valve; 511, mechanical low-temperature antifreeze valve; 512, pressure relief valve; 5121, drain pipe; 52, three-way ball valve; 6, exhaust hood; 61, blast hood; 62, exhaust pipe; 621, exhaust net; 7, controller. DETAILED DESCRIPTION

[0033] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the modules or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0036] like Figure 1-6 A motorhome water heater shown in the figure includes a shell 1 and a zero cold water device, a water outlet joint 11 is provided on one side of the shell 1, and a water inlet joint 12 is provided on the other side; the zero cold water device includes a constant temperature chamber 5 and a circulating water pump 4, the inlet end of the constant temperature chamber 5 is connected to the hot water pipe 22 of the water heater, and the outlet end of the constant temperature chamber 5 is connected to the water outlet joint 11 through the hot water outlet pipe 111; the water outlet end of the circulating water pump 4 is connected to the cold water pipe 21 of the water heater, and the cold water pipe 21 is connected to the water inlet joint 12 through the cold water inlet pipe 121; wherein, the zero cold water device also includes a return water joint 13 arranged on one side of the shell 1, and the water inlet end of the circulating water pump 4 is connected to the return water joint 13 and the hot water outlet pipe 111 through the return water pipe 131.

[0037] Based on the above structure, when using the RV water heater of the utility model, if Figure 6 The water inlet joint 12 is connected through an external water inlet pipeline, the water outlet joint 11 is connected to the water point through an external water outlet pipeline, and the return water joint 13 located on the same side of the water outlet is also connected to the external water outlet pipeline through an external return water pipeline. Cold water is input from the external water inlet pipeline and passes through the cold water inlet pipe 121 and then enters the water heater through the cold water pipe 21 for heating, and is discharged from the hot water pipe 22 into the constant temperature chamber 5. The hot water in the constant temperature chamber 5 passes through the hot water outlet pipe 111 and then through the return water pipe 131 to the circulating water pump 4 for circulation to the cold water The hot water is heated again through the water heater through the reciprocating circulation to achieve the desired hot water temperature and stored in the constant temperature chamber 5. When the water outlet joint 11 discharges water to the external water outlet pipeline, the hot water is output from the constant temperature chamber 5 to the water use point. However, the temperature of the hot water supplied to the water use point and not fully used and located in the external water outlet pipe is reduced. The hot water enters the circulating water pump 4 through the external return water pipeline from the return water joint 13 through the return water pipe 131 for circulating heating, thereby avoiding the reduction of the hot water temperature and achieving zero cold water at the water use point.

[0038] In addition, the return water joint 13 is arranged on the same side as the water outlet joint 11, and the water outlet end of the circulating water pump 4 is connected to the cold water pipe 21, which extends the distance between the water outlet end of the circulating water pump 4 and the water inlet joint 12. This not only avoids the formation of cold and hot water cross flow in the cold water inlet pipe 121, affecting the normal use of cold water, but also ensures the stability of the RV water supply system. At the same time, it also shortens the hot water circulation path, improves hot water circulation, and ensures the zero cold water effect.

[0039] Furthermore, the RV water heater of the utility model also includes a heat exchanger 2, which is provided with a hot water pipe 22 and a cold water pipe 21; the water outlet end of the circulating water pump 4 is provided with a first connecting pipe 42 and the first connecting pipe 42 is provided with a one-way valve 421 for preventing water backflow, the cold water pipe 21 is connected with a first three-way pipe, and the first connecting pipe 42 is communicated with the first three-way pipe; the water inlet end of the circulating water pump 4 is provided with a second connecting pipe 41, the return pipe 131 is connected with a second three-way pipe, and the second connecting pipe 41 is communicated with the second three-way pipe; wherein, the hot water outlet pipe 111 is connected with a third three-way pipe, and the second three-way pipe and the third three-way pipe are connected with a third connecting pipe 112 to connect the hot water outlet pipe 111, the return pipe 131 and the second connecting pipe 41.

[0040] When in use, the hot water in the hot water outlet pipe 111 enters the circulating water pump 4 from the second connecting pipe 41 through the third connecting pipe 112 and is transported to the heat exchanger 2 for heating, or the hot water in the return pipe 131 enters the circulating water pump 4 from the second connecting pipe 41 through the second connecting pipe 41 and is transported to the heat exchanger 2 for heating. Of course, the hot water in the hot water outlet pipe 111 enters the circulating water pump 4 from the second connecting pipe 41 through the third connecting pipe 112 and the hot water in the return pipe 131 enters the circulating water pump 4 from the second connecting pipe 41 through the second connecting pipe 41 at the same time and is transported to the heat exchanger 2 for heating.

[0041] Furthermore, the inlet end of the constant temperature chamber 5 is connected to a four-way valve 51, the hot water pipe 22 is connected to the four-way valve 51, and the four-way valve 51 is also connected to a pressure relief valve 512, and the pressure relief valve 512 is provided with a drain pipe 5121 connected to the outside. When the internal pressure of the water heater is high, the pressure can be released in time through the pressure relief valve 512, and the water in the water heater can be discharged to the outside of the water heater through the drain pipe 5121; wherein, the outlet end of the constant temperature chamber 5 is also provided with a three-way ball valve 52, and the hot water outlet pipe 111 is connected to the three-way ball valve 52. Specifically, hot water can also be drained or depressurized through the three-way ball valve 52.

[0042] Furthermore, the RV water heater of the utility model also includes a drain valve connected to the four-way valve 51, which is a mechanical low-temperature antifreeze valve 511 and has a built-in temperature sensing element for detecting water temperature. When the temperature is lower than a specific temperature, the mechanical low-temperature antifreeze valve 511 opens to drain water.

[0043] Specifically, the mechanical low-temperature antifreeze valve 511 has a built-in temperature sensing element, which can detect a temperature range of 1-6°C. Its working principle is to use the temperature sensing element to sense the change of water temperature and realize automatic opening and closing, so as to discharge the low-temperature water and prevent the low-temperature water from freezing in the water pipe of the water heater. When the ambient temperature drops and the water temperature is close to the freezing point, for example, at around 4°C, the temperature sensing element will trigger the valve to open, and the low-temperature water in the water heater will be quickly discharged. As the water temperature rises to the set value, the temperature sensing element will trigger the valve to close; in addition, the mechanical low-temperature antifreeze valve 511 can realize opening and closing without power supply, avoiding the limitations and potential failure risks brought by power dependence, ensuring normal operation in an environment without electricity, and effectively preventing the damage to the water pipe and internal structure caused by water freezing under low temperature conditions, thereby improving the durability and reliability of the water heater and reducing maintenance costs.

[0044] Furthermore, the cold water inlet pipe 121 is provided with a water flow sensor 212, a filter drain valve 213 for filtering and releasing cold water, and a first temperature probe 211 for detecting the temperature of cold water. The cold water pipe 21 is connected to the filter drain valve 213; the hot water pipe 22 is provided with a second temperature probe 221 for detecting the temperature of hot water.

[0045] Specifically, the RV water heater of the utility model also includes a controller 7, a first thermostat 23 is provided on the cold water pipe 21, a second thermostat 24 is provided on the hot water pipe 22, and the first temperature probe 211, the second temperature probe 221, the first thermostat 23 and the second thermostat 24 are all electrically connected to the controller 7.

[0046] It should be noted that, in this embodiment, the other side of the housing 1 is also provided with a wire connector 15 for leading out the internal wires of the water heater, such as the power supply wire of the controller 7. The water flow sensor 212 and the circulating water pump 4 are both connected to the controller 7 to realize the signal feedback of the water flow sensor 212 to the controller 7 and the control of the circulating water pump 4. When in use, the first temperature probe 211 detects the temperature of the cold water entering the heat exchanger 2 and feeds back the signal to the controller 7, and the second temperature probe 221 detects the temperature of the hot water output by the heat exchanger 2 and feeds back the signal to the controller 7 to realize the detection of cold water and hot water, and at the same time, it can ensure that the output hot water meets the needs of the user, wherein the first thermostat 23 and the second thermostat 24 are used to detect the operating state of the heat exchanger 2 to ensure the normal operation of the water heater and the stability of the water heater when it is working.

[0047] See also Figure 3-4 The RV water heater of the utility model also includes a burner 3 arranged at the bottom of the heat exchanger 2, and the air inlet end of the burner 3 is provided with a proportional valve 32 connected thereto; the shell 1 is also provided with an air inlet connector 14, and the air inlet port of the proportional valve 32 is connected to the air inlet connector 14 through a gas pipe 141.

[0048] Specifically, in the present embodiment, the burner 3 is further provided with a gas dividing rod assembly 31, the gas inlet of the gas dividing rod assembly 31 forms the gas inlet end of the burner 3, the gas outlet of the proportional valve 32 is connected to the gas inlet of the gas dividing rod assembly 31, the gas inlet of the proportional valve 32 is connected to the gas inlet connector 14 through the gas pipe 141, the gas inlet connector 14 is connected to an external gas tank or gas cylinder to realize gas supply, and of course the gas inlet connector 14 can also be connected to an external gas pipeline for gas supply.

[0049] Furthermore, the RV water heater of the utility model also includes a smoke exhaust assembly, which includes a smoke exhaust hood 6 and a smoke exhaust tube 62, and a blasting member is also provided between the smoke exhaust hood 6 and the smoke exhaust tube 62, and the blasting member includes a blasting hood 61 and a fan, the smoke exhaust hood 6 is arranged on the top of the heat exchanger 2, and the smoke inlet end of the smoke exhaust hood 6 is connected to the smoke outlet of the heat exchanger 2, the smoke outlet end of the smoke exhaust hood 6 is connected to the smoke inlet of the smoke exhaust tube 62 through the blasting hood 61, and the smoke outlet of the smoke exhaust tube 62 is connected to the outside. When in use, the fan rotates and sucks the smoke from the smoke outlet of the heat exchanger 2 into the blasting hood 61 through the smoke exhaust hood 6, and discharges it to the outside through the smoke outlet of the smoke exhaust tube 62.

[0050] It should be noted that, in the present embodiment, the smoke exhaust port of the smoke exhaust tube 62 is further provided with a smoke exhaust net 621 for preventing foreign matter from entering the smoke exhaust tube 62 .

[0051] In summary, the RV water heater of the utility model realizes that hot water is available at any time by setting a zero cold water device, avoiding the need to drain cold water before hot water can be produced, thereby reducing water resource waste. At the same time, the return water joint 13 is arranged on the same side as the outlet water joint, and the outlet end of the circulating water pump 4 is connected to the cold water pipe, extending the distance between the outlet end of the circulating water pump 4 and the water inlet joint 12, which not only avoids the formation of cold and hot water cross flow in the cold water inlet pipe 121, affecting the normal use of cold water, but also ensures the stability of the RV water supply system, and at the same time shortens the hot water circulation path, improves hot water circulation, and ensures the zero cold water effect.

[0052] The RV water heater of the utility model provides reliable antifreeze protection for drainage when the ambient temperature is low by setting a mechanical low-temperature antifreeze valve 511, thereby ensuring that the water in the water heater can be discharged. At the same time, the mechanical low-temperature antifreeze valve 511 can realize the drainage function at low temperatures without the need for electricity supply, thereby ensuring that the water in the water heater is quickly discharged, and effectively preventing damage to the water pipes and internal structures caused by water freezing under low temperature conditions, thereby improving the reliability of the water heater and reducing maintenance costs.

[0053] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0054] It should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the modules or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In addition, in the description of the present utility model, "plurality" and "several" mean two or more than two, unless otherwise clearly and specifically defined.

[0056] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A motorhome water heater, characterized in that: include: A shell having a water outlet joint on one side and a water inlet joint on the other side; A zero cold water device, comprising a constant temperature chamber and a circulating water pump, wherein the inlet end of the constant temperature chamber is connected to the hot water pipe of the water heater, and the outlet end of the constant temperature chamber is connected to the water outlet joint through a hot water outlet pipe; the outlet end of the circulating water pump is connected to the cold water pipe of the water heater, and the cold water pipe is connected to the water inlet joint through a cold water inlet pipe; Wherein, the zero cooling water device also includes a return water joint arranged on one side of the shell, and the water inlet end of the circulating water pump is connected with the return water joint and the hot water outlet pipe through a return water pipe.

2. The RV water heater according to claim 1, characterized in that: It also includes a heat exchanger, on which the hot water pipe and the cold water pipe are provided; The water outlet of the circulating water pump is provided with a first connecting pipe and the first connecting pipe is provided with a one-way valve to prevent water backflow; the cold water pipe is connected with a first three-way pipe, and the first connecting pipe is in communication with the first three-way pipe; A second connecting pipe is provided at the water inlet end of the circulating water pump, a second three-way pipe is connected to the return pipe, and the second connecting pipe is communicated with the second three-way pipe.

3. The RV water heater according to claim 2, characterized in that: The hot water outlet pipe is connected to a third three-way pipe, and the second three-way pipe and the third three-way pipe are connected to a third connecting pipe to connect the hot water outlet pipe, the return pipe and the second connecting pipe.

4. The RV water heater according to any one of claims 1 to 3, characterized in that: The inlet end of the constant temperature chamber is connected with a four-way valve, the hot water pipe is communicated with the four-way valve, the four-way valve is also connected with a pressure relief valve, and the pressure relief valve is provided with a drainage pipe communicated with the outside.

5. The RV water heater according to claim 4, characterized in that: The outlet end of the constant temperature chamber is also provided with a three-way ball valve, and the hot water outlet pipe is connected to the three-way ball valve.

6. The RV water heater according to claim 4, characterized in that: It also includes a drain valve connected to the four-way valve. The drain valve is a mechanical low-temperature antifreeze valve and has a built-in temperature sensing element for detecting water temperature. When the temperature is lower than a specific temperature, the mechanical low-temperature antifreeze valve opens to drain water.

7. The RV water heater according to any one of claims 1 to 3, characterized in that: The cold water inlet pipe is provided with a water flow sensor, a filter drain valve and a first temperature probe for detecting the cold water temperature. The cold water pipe is connected to the filter drain valve; the hot water pipe is provided with a second temperature probe for detecting the hot water temperature.

8. The RV water heater according to claim 7, characterized in that: It also includes a controller. The cold water pipe is provided with a first thermostat, the hot water pipe is provided with a second thermostat, and the first temperature probe, the second temperature probe, the first thermostat and the second thermostat are all electrically connected to the controller.

9. The RV water heater according to claim 2, characterized in that: It also includes a burner arranged at the bottom of the heat exchanger, and an air inlet end of the burner is provided with a proportional valve communicating therewith; The shell is also provided with an air inlet connector, and the air inlet of the proportional valve is communicated with the air inlet connector through a gas pipe.

10. The RV water heater according to claim 2, characterized in that: It also includes a smoke exhaust component, which includes a smoke exhaust hood and a smoke exhaust tube. The smoke exhaust hood is arranged on the top of the heat exchanger, and the smoke inlet end of the smoke exhaust hood is connected to the smoke outlet of the heat exchanger, the smoke outlet end of the smoke exhaust hood is connected to the smoke inlet of the smoke exhaust tube, and the smoke exhaust outlet of the smoke exhaust tube is connected to the outside.

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