Vehicle-mounted water heater with constant-temperature tank

Abstract

The utility model provides a vehicle-mounted water heater with constant temperature bin, including cold water inlet, heat exchanger, combustor, gas inlet, exhaust fan, hot water outlet and constant temperature bin, the cold water inlet is used for introducing outside cold water into the vehicle-mounted water heater, the heat exchanger is used for heating the cold water, the combustor is connected with heat exchanger, the gas inlet is connected with combustor and is used for inputting gas, the exhaust fan is used for discharging the waste gas generated after combustion, the hot water outlet is arranged at the water outlet end of heat exchanger, the constant temperature bin is arranged between heat exchanger and hot water outlet and is used for buffering and mixing the hot water after heating, the utility model discloses a constant temperature bin, and adopts double space separation structure inside, the hot water after heating needs first entering the space far from the water outlet end and then entering the water outlet area through the water hole, effectively changes the water flow path, makes the water fully mix, restrains temperature transient, makes the water outlet temperature more constant, and improves the use comfort.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted water heater technology, and more specifically to a vehicle-mounted water heater with a constant temperature chamber. Background Technology

[0002] With the increasing diversification of lifestyles, mobile homes, camping vehicles, and mobile medical vehicles are becoming more common in vehicles, leading to a growing demand for in-vehicle hot water systems. Traditional water heaters, mostly household or stationary units, are bulky, lack precise temperature control, and are ill-suited to the complex conditions of a vehicle environment, such as fluctuating water pressure and varying gas flow rates. This results in large temperature fluctuations, low heating efficiency, and high maintenance complexity. Especially in existing direct-flow water heaters, the water temperature is easily affected by changes in combustion intensity and water flow rate, leading to inconsistent hot and cold water experiences. Furthermore, traditional water heaters generally lack water softening treatment, particularly in areas with hard water. Calcium and magnesium ions in the water easily form scale inside the heat exchanger, severely impacting heating efficiency and equipment lifespan, increasing maintenance costs. Therefore, there is an urgent need for a compact, highly efficient, and stable water heater suitable for in-vehicle use to meet the practical needs of mobile hot water supply. Utility Model Content

[0003] In view of this, the present invention provides a vehicle-mounted water heater with a constant temperature chamber.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A vehicle-mounted water heater with a constant temperature chamber includes a cold water inlet, a heat exchanger, a burner, a gas inlet, an exhaust fan, a hot water outlet, and a constant temperature chamber. The cold water inlet introduces external cold water into the water heater. The heat exchanger heats the cold water into hot water. The burner is thermally connected to the heat exchanger. The gas inlet is connected to the burner for inputting gas. The exhaust fan discharges exhaust gases produced after combustion. The hot water outlet is located at the outlet end of the heat exchanger. The constant temperature chamber is located between the heat exchanger and the hot water outlet to regulate the temperature of the heated water. The water is buffered and mixed. The constant temperature chamber includes a chamber body with an internal partition, as well as an inlet pipe and an outlet pipe. The partition divides the chamber body into a first cavity and a second cavity. The inlet pipe enters the first cavity from outside the chamber body and passes through the partition to extend to the second cavity. The partition has a water passage hole for connecting the first cavity and the second cavity. The outlet pipe enters and exits the second cavity from outside the chamber body and passes through the partition to extend to the first cavity. The hot water flows out from the heat exchanger and enters the second cavity of the constant temperature chamber through the inlet pipe, enters the first cavity through the water passage hole, and then flows out through the outlet pipe.

[0006] In a preferred embodiment, a filtration device is also included. The filtration device is located between the cold water inlet and the heat exchanger. The filtration device is equipped with a stainless steel filter screen, which divides the interior of the filtration device into a water inlet channel and a filter cartridge chamber. The filter cartridge chamber is filled with a water softener for filtering impurities and softening the water.

[0007] In a preferred embodiment, a housing is further included, which encloses the filter, heat exchanger, burner, exhaust fan, and constant temperature chamber. The cold water inlet, gas inlet, and hot water outlet are located on the outside of the housing and are respectively connected to the filter, burner, and constant temperature chamber via pipes.

[0008] In a preferred embodiment, the partition divides the chamber into a first space and a second space; the inlet pipe enters from the side wall of the chamber and passes through the partition, extending to the second space; the partition is provided with at least one water passage hole, and the outlet pipe enters from the other side wall of the chamber and extends to the first space, so that water flows through the inlet pipe into the second space, then through the water passage hole into the first space, and finally is discharged through the outlet pipe, thereby achieving a constant temperature chamber to mix and buffer the heated water, reducing water temperature fluctuations and improving the stability of the outlet water temperature and user comfort.

[0009] In a preferred embodiment, the stainless steel filter screen divides the interior of the filtration device into a water inlet channel and a filter cartridge compartment, the filter cartridge compartment being used to contain the water softener; the water softener is an ion exchange resin or polyphosphate particles.

[0010] In a preferred embodiment, the outer casing is made of metal and has ventilation holes or louvered structures for ventilation and heat dissipation.

[0011] In the preferred embodiment, the cold water inlet, gas inlet, and hot water outlet all adopt a quick-connect interface structure, which facilitates installation and disassembly.

[0012] In the preferred embodiment, the heat exchanger is a fast heat exchanger.

[0013] As can be seen from the above technical solution, compared with the prior art, the present invention has the following beneficial technical effects:

[0014] This invention features a thermostatic chamber with a dual-space partition structure connected by water passages, forming a "secondary buffer" and a "dynamic mixing zone." Heated hot water first enters the space furthest from the outlet before flowing through the water passages into the outlet area. This effectively alters the water flow path, thoroughly mixes the water, suppresses temperature fluctuations, and ensures a more constant outlet temperature, preventing sudden temperature changes and improving user comfort. The thermostatic chamber's temperature buffering and mixing functions are achieved through its physical structure, eliminating the need for additional electronic temperature control components. It can operate stably in complex environments such as fluctuating vehicle water pressure and frequent start-stop cycles, demonstrating high reliability and making it suitable for mobile applications such as RVs, camping vehicles, and mobile medical vehicles.

[0015] The cold water inlet is equipped with a filtration device containing a stainless steel filter screen and a water softener (such as ion exchange resin or polyphosphate granules). This dual treatment of impurity filtration and hard water softening significantly reduces the scaling rate of the heat exchanger, extends the equipment's lifespan, and improves heating efficiency. The cold water inlet, hot water outlet, and gas inlet all use quick-connect interfaces for easy installation and disassembly. The outer casing is made of metal or high-strength engineering plastic, featuring a compact structure, ventilation, and heat dissipation, making it suitable for vehicle installation and easy maintenance. This invention optimizes the water circuit structure, heating process, and temperature control method, ensuring a compact structure while meeting the requirements for efficient heating and constant-temperature water output. This enhances the practicality, safety, and comfort of the water heater, demonstrating broad application prospects and significant market value. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of a constant temperature chamber.

[0019] Reference numerals: 1. Cold water inlet; 2. Filter device; 3. Exhaust fan; 4. Heat exchanger; 5. Burner; 6. Gas inlet; 7. Hot water outlet; 8. Constant temperature chamber; 9. Outer shell; 80. Chamber body; 81. Partition; 82. Water inlet pipe; 83. Water passage hole; 84. Water outlet pipe; 85. First chamber; 86. Second chamber. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0021] In the description of this application, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] like Figure 1 , Figure 2 As shown, this invention provides a vehicle-mounted water heater with a constant temperature chamber, comprising: a cold water inlet 1, a filter device 2, a flue fan 3, a heat exchanger 4, a burner 5, a gas inlet 6, a hot water outlet 7, a constant temperature chamber 8, and a casing 9. The cold water inlet 1 is located outside the water heater and is used to connect to an external cold water source. Cold water enters the filter device 2 through the cold water inlet 1. The filter device 2 has a stainless steel filter screen inside, which effectively intercepts impurities, preventing scale buildup or blockage inside the heat exchanger. The filter screen divides its interior into an inlet channel and a filter cartridge chamber, which is filled with a water softener. This water softener can adsorb and exchange calcium and magnesium ions in the water, effectively preventing scale buildup inside the heating system and improving the durability and thermal efficiency of the water heater. Recommended water softeners include cation exchange resin and polyphosphate particles; these can effectively remove Ca²⁺ and Mg²⁺ ions from the water, reduce the scaling rate on the heat exchange surface, and extend the service life of the equipment. The softened and filtered cold water enters the heat exchanger 4. The heat exchanger 4 can be a plate type or a shell-and-tube type, and its heat source is provided by the burner 5. The burner 5 receives gas through the gas inlet 6, and the heat generated by combustion is transferred to the heat exchanger 4, thereby heating the water flow. The exhaust gas generated during combustion is extracted by the exhaust fan 3 and guided out of the vehicle to ensure combustion efficiency and operational safety.

[0024] Furthermore, after the hot water is heated, it enters the constant-temperature chamber 8 located downstream of the heat exchanger 4. The constant-temperature chamber 8 includes a sealed chamber body 80, inside which a partition 81 is provided, dividing the chamber body 80 into two opposing spaces, namely a first chamber 85 and a second chamber 86. One end of a water inlet pipe 82 protrudes from the upper side wall of the chamber body 80, serving as the water inlet of the constant-temperature chamber 8. The water inlet end connects to the water outlet structure of the heat exchanger 4. The water inlet pipe 82 is introduced from the side wall of the chamber body 80, passes through the partition 81, and extends into the second chamber 86, realizing communication between the outside and the second chamber 86. The partition 81 is provided with at least one water passage hole 83 connecting the first chamber 85 and the second chamber 86, through which water can flow from the second chamber 86 into the first chamber 85. The water outlet pipe 84 enters from the lower side of the chamber 80. One end of the water outlet pipe 84 protrudes from the lower wall of the chamber 80, which is the water outlet of the constant temperature chamber 8. This end is connected to the hot water outlet 7. The other end passes through the second cavity 86 and extends into the first cavity 85, realizing communication between the outside and the first cavity 85. The water outlet pipe 84 is used to guide the water flow to the hot water outlet 7. Through the above-mentioned constant temperature chamber structure design, the water flow path is effectively changed and segmented, forming a "secondary buffer" and a "dynamic mixing zone". Its working principle is as follows: After being heated by the heat exchanger, the water enters the end of the constant temperature chamber away from the water outlet, i.e., the second space. In this area, a primary buffer volume is formed, which delays the water outlet time and suppresses temperature fluctuations. Then, during the process of the water flowing through the water passage to the first space, turbulence is generated due to factors such as flow rate control and cavity disturbance, which promotes the mixing of water at different temperatures, thereby achieving temperature uniformity. Finally, the water flows out from the first space through the water outlet pipe. This design avoids the problem of drastic temperature fluctuations caused by the "instantaneous water output" of traditional direct-flow water heaters. The secondary buffering mechanism includes a first buffer and a second buffer. The first buffer involves water entering the chamber but not immediately flowing out, instead entering a space away from the outlet pipe, effectively suppressing drastic temperature changes in a short period. The second buffer requires the water flow to pass through both spaces via the water passage, increasing the hot water's residence time and the opportunity for disturbance. The dynamic mixing zone works as follows: the water passage size is designed to control the water flow rate, promoting thorough mixing of newly entering hot water and old water, forming a dynamic temperature equilibrium zone. Furthermore, the turbulence created by the water passage not only enhances the uniformity of hot water but also suppresses water temperature stratification, preventing localized overheating or undercooling, thus further improving temperature stability. Compared to the direct-flow structure, it significantly reduces sudden temperature changes caused by fluctuations in the combustion heat source and frequent start-stop cycles. Users can avoid "sudden hot and cold" phenomena caused by instantaneous gas fluctuations or water flow interruptions when showering or using hot water. It is particularly suitable for water pressure fluctuation environments in vehicles.

[0025] Furthermore, the internal structure design of the constant temperature chamber 8 enables a constant and stable outlet water temperature curve to be formed in complex working environments such as frequent start-stop of the water heater and fluctuations in vehicle water pressure, significantly improving the comfort of users when bathing or using hot water. Simultaneously, the spatial partitioning and water flow path design of the constant temperature chamber 8 does not rely on additional electronic components, achieving "physical temperature regulation" without power assistance, thus improving structural reliability and adaptability. In addition, the outer shell 9 is used to enclose the aforementioned components, providing structural protection and heat dissipation. The outer shell 9 is made of metal and features ventilation holes or louvers to facilitate heat dissipation from heat exchangers, burners, and other heat-generating components. The cold water inlet 1, gas inlet 6, and hot water outlet 7 are located on the outside of the outer shell 9, all using quick-connect interfaces for convenient installation, disassembly, and maintenance during vehicle use. Through the above structure and process, this invention provides a water heater system suitable for vehicle environments, with excellent constant temperature performance and anti-scaling capabilities, particularly suitable for use in RVs, mobile medical vehicles, and camping vehicles, demonstrating significant application prospects and promotional value.

[0026] Figure 1 This is a schematic diagram of the overall structure of the vehicle-mounted water heater of the present invention. The components are connected in sequence, with the following path: cold water inlet 1 → filter device 2 → heat exchanger 4 → constant temperature chamber 8 → hot water outlet 7; gas inlet 6 is connected to burner 5, and exhaust fan 3 is located at the end of the combustion system. Figure 2 This is a cross-sectional schematic diagram of the constant temperature chamber 8. It shows that the water inlet pipe 82 passes through the partition 81 and enters the second chamber 86. Water flows through the water passage 83 into the first chamber 85 and then exits from the outlet pipe 84. Figure 2 Inside the central chamber 80, the dotted arrow indicates the direction of water flow; the end of the inlet pipe 82 furthest from the chamber 80 is connected to the heat exchanger 4 via a pipe, and the end of the outlet pipe 84 furthest from the chamber 80 is connected to the hot water outlet 7.

[0027] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vehicle-mounted water heater with a constant temperature chamber, characterized in that: It includes a cold water inlet (1), a heat exchanger (4), a burner (5), a gas inlet (6), a flue gas fan (3), a hot water outlet (7), and a constant temperature chamber (8); The cold water inlet (1) is used to introduce external cold water into the water heater. The heat exchanger (4) is used to heat the cold water into hot water. The burner (5) is thermally connected to the heat exchanger (4). The gas inlet (6) is connected to the burner (5) to input gas. The exhaust fan (3) is used to discharge the exhaust gas generated after combustion. The hot water outlet (7) is located at the outlet end of the heat exchanger (4). The constant temperature chamber (8) is located between the heat exchanger (4) and the hot water outlet (7) for buffering and mixing the heated hot water. The constant temperature chamber (8) includes a chamber body (80) with an internal partition (81), an inlet pipe (82), and an outlet pipe (84). The partition (81) divides the chamber body (80) into a first cavity (85) and a second cavity (86). The inlet pipe (82) enters the first cavity (85) from outside the chamber body (80) and passes through the partition (81) to extend to the second cavity (86). The cavity (86) has a partition (81) with a water passage hole (83) for connecting the first cavity (85) and the second cavity (86). The water outlet pipe (84) enters and exits the second cavity (86) from outside the chamber (80) and passes through the partition (81) to extend to the first cavity (85). The hot water flows out from the heat exchanger (4) and enters the second cavity (86) of the constant temperature chamber (8) through the water inlet pipe (82), enters the first cavity (85) through the water passage hole (83), and then flows out through the water outlet pipe (84).

2. A vehicle-mounted water heater with a constant temperature chamber according to claim 1, characterized in that: It also includes a filter device (2), which is located between the cold water inlet (1) and the heat exchanger (4). The filter device (2) is equipped with a stainless steel filter screen inside, which divides the interior of the filter device (2) into a water inlet channel and a filter cartridge chamber. The filter cartridge chamber is filled with a water softener for filtering impurities and softening the water.

3. A vehicle-mounted water heater with a constant temperature chamber according to claim 2, characterized in that: It also includes an outer shell (9), which covers the filter device (2), heat exchanger (4), burner (5), exhaust fan (3) and constant temperature chamber (8). The cold water inlet (1), gas inlet (6) and hot water outlet (7) are located on the outside of the outer shell (9) and are respectively connected to the filter device (2), burner (5) and constant temperature chamber (8) through pipes.

4. A vehicle-mounted water heater with a constant temperature chamber according to claim 1, characterized in that: The water inlet pipe (82) has one end protruding from the outer side of the chamber body (80) as the water inlet of the constant temperature chamber (8), which is connected to the heat exchanger (4). The water outlet pipe (84) has one end protruding from the outer side of the chamber body (80) as the water outlet of the constant temperature chamber (8), which is connected to the hot water outlet (7). The partition plate (81) has at least one water passage hole (83). After the water flows through the water inlet pipe (82) into the second chamber (86), the water flows through the water inlet into the second chamber (86) and then through the water passage hole (83) into the first chamber (85), and finally is discharged from the water outlet. This allows the constant temperature chamber (8) to mix and buffer the heated water to reduce water temperature fluctuations and improve the stability of the outlet water temperature and the comfort of use.

5. A vehicle-mounted water heater with a constant temperature chamber according to claim 2, characterized in that: The stainless steel filter screen described above divides the interior of the filter device (2) into a water inlet channel and a filter cartridge chamber. The filter cartridge chamber is used to hold the water softener. The water softener is an ion exchange resin or polyphosphate particles.

6. A vehicle-mounted water heater with a constant temperature chamber according to claim 3, characterized in that: The outer shell (9) is made of metal and has ventilation holes or louvered structures for ventilation and heat dissipation.

7. A vehicle-mounted water heater with a constant temperature chamber according to claim 3, characterized in that: The cold water inlet (1), gas inlet (6) and hot water outlet (7) all adopt a quick-connect interface structure, which is convenient for installation and disassembly.

8. A vehicle-mounted water heater with a constant temperature chamber according to claim 1, characterized in that: The heat exchanger (4) is a fast heat exchanger.

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