TECHNICAL FIELD

The present disclosure relates to the field of vehicle-mounted water heater, and in particular to a vehicle-mounted gas water heater.

BACKGROUND OF THE PRESENT INVENTION

Water heaters designed for home or commercial buildings are usually bulky, heavy, and not portable, and are not suitable for use in vehicles and ships where hot water is required, such as motorhomes, ambulances, fire engines, military vehicles, yachts, etc.

At present, vehicle-mounted water heater for vehicles and ships is classified into fuel water heater, electric water heater, gas water heater and solar water heater according to heat sources; among them, gas water heater is relatively environmentally friendly and/or energy-saving, easy to use, reliable and less costly compared with other types of water heater. Therefore, gas water heater is the main direction for the development of vehicle-mounted water heater in the future.

In the conventional vehicle-mounted gas water heater, the tube coil of the heat exchanger is generally a cold water tube coil, that is, a cold water tube wound around the heat exchanger case. This structure is particularly easy to form condensed water, and the formed condensed water is not easily volatilized and continuously accumulates. The accumulated condensed water will corrode the internal components of the water heater, affect the normal operation of the water heater, and cause dripping phenomenon of the water heater.

In case of a conventional vehicle-mounted gas water heater, on the one hand, there are situations that water is not hot enough in winter and overheated in summer, and that when the season changes in winter and summer, it is necessary to manually operate the water flow control valve; on the other hand, since the incoming water pressure of the vehicle-mounted gas-fired water heater varies from time to time, the water flow rate is not stable, resulting in a fluctuation on the actual temperature of the delivered water. It is often necessary to control the flow rate of water to ensure that the delivered water is at the desired temperature, which greatly increases inconvenience of use.

In case of a conventional vehicle-mounted gas water heater, the burner is generally an open type which exchanges gas with the atmosphere. Because the vehicle environment requires the water heater to be as small as possible, on the one hand, the outside air is difficult to smoothly enter the inside of the water heater, and on the other hand, the internal air flows irregularly and thus the fuel gas cannot be sufficiently mixed with air. As a result, combustion of the gas is insufficient, smoke index is high, and thermal efficiency is low. Formation and accumulation of condensed water is further promoted. Additionally, insufficient combustion of gas can produce carbon monoxide which can cause life danger. When it is necessary to increase the maximum heat load, merely increasing the heat load by expanding the gas nozzle without changing the size of the burner may lead to an even more insufficient combustion, the carbon monoxide content in the flue gas rises, and a yellow flame is generated. Due to the insufficient combustion of fuel gas, the existing vehicle-mounted gas water heater generally cannot supply hot water quickly and in large quantities. Due to the influence of the limited space of the vehicle environment on the volume of the burner, it is impossible to simply increase the dimension of the burner so as to increase the heat load and heat more water in the same amount of time.

In addition to the above deficiencies, the existing vehicle-mounted gas water heater has a complex structure, low utilization rate, is easily affected by the movement of the vehicle body and the hull, has a short service life, and has a high failure rate. As a result, it is not well suited for use with hard water, and for use in a situation when the water pipe in the exchanger is broken due to the expansion of water caused by icing in the pipe under a low ambient temperature. Therefore, it is necessary to improve the above deficiencies.

SUMMARY OF THE PRESENT INVENTION

In order to overcome the above-mentioned deficiencies of the prior art, the present disclosure provides a vehicle-mounted gas water heater capable of avoiding or at least to some extent avoiding the accumulation of condensed water. The present disclosure is realized by the following technical solutions: a vehicle-mounted gas water heater comprising a casing, a water delivering pipe, a heat exchanger, a combustion heating device, a smoke exhausting device, and a controller, the combustion heating device comprising a gas pipe, a gas valve, an ignition device and a burner, the water delivering pipe, from a water inlet to a water outlet, comprising a water inflow section, a first heating section, a second heating section and a water outflow section, wherein the water inflow section is shortened, wherein the water inflow section is shortened, the first heating section is rapidly heated directly by the combustion heating device, and the second heating section is heated by winding on the heat exchanger, so that during water flows in from the water inlet and flows out from the water outlet, formation of condensed water at the water inflow section is reduced, condensed water formed on the surface of the first heating section is rapidly evaporated, and it is difficult for condensed water to form on the surfaces of the second heating section and the outflow section.

Preferably, the vehicle-mounted gas water heater further comprises a gas mixing enhancing seat, the gas mixing enhancing seat comprising a port and a gas mixing enhancing chamber, wherein the burner and the ignition portion of the ignition device are located in the gas mixing enhancing chamber, the port is located adjacent to the burner for gas and air ingress, an upper portion of the gas mixing enhancing seat is connected to a lower portion of the heat exchanger, an upper portion of the heat exchanger is connected to the smoke exhausting device, so that the port, the gas mixing enhancing chamber, the combustion chamber of the heat exchanger, and the smoke exhausting passage of the smoke exhausting device are sequentially connected, and a gas flow passage is formed, the flow of gas is driven by the smoke exhausting device.

Preferably, the vehicle-mounted gas water heater further comprises a mechanical flow stabilizer, wherein the flow stabilizer is disposed in the water inflow section or the water outflow section for stabilizing water flow rate when water inflow pressure changes.

Preferably, the vehicle-mounted gas water heater further comprises a water flow rate regulating valve of a memory alloy type, wherein the water flow rate regulating valve is disposed in the water inflow section for automatically adjusting water flow rate in direct proportion to a change of water inflow temperature.

Preferably, the port comprises a gas vent and an air vent, the gas vent being located at a side of the gas mixing enhancing seat, the air vent being located at the bottom and/or side of the gas mixing enhancing seat.

Preferably, the vehicle-mounted gas water heater further comprises a temperature sensor electrically connected to the controller, the temperature sensor comprising an water inflow temperature sensor and/or an water outflow temperature sensor, the water inflow temperature sensor being disposed in the water inflow section, and the water outflow temperature sensor being disposed in the water outflow section.

Preferably, the gas valve is a gas proportional valve, the water delivering pipe comprises a water flow sensor, and the controller controls the gas proportional valve based on a temperature signal of the water inflow temperature sensor and/or the water outflow temperature sensor and a water flow rate signal of the water flow sensor, so that an input heat load of the water heater matches a current water inflow temperature and water flow rate to achieve or approach a setting value of an water outflow temperature.

Preferably, the vehicle-mounted gas water heater further comprises a filtering device for filtering air flowing in from an air inlet of the casing.

Preferably, the vehicle-mounted gas water heater further comprises a connecting wire and a wire controller, an end of the connecting wire is connected to the controller, another end of the connecting wire being drawn out from the casing and connected to the wire controller.

Preferably, the filtering device has a drainage structure for discharging water that has flowed in from the air inlet.

Preferably, the controller further comprises a programming interface for reprogramming the controller.

The water delivering pipe of the present disclosure effectively reduces the generation of condensed water, can avoid or at least to some extent avoid the accumulation of condensed water, and can reduce the formation of scale in the water delivering pipe, which is beneficial for prolonging the service life of the water heater, making the water heater safe and reliable. Through the setting of the gas mixing enhancing seat, the heat load of the burner can be increased without increasing the overall volume of the water heater, so that the combustion of the gas is more sufficient, more water can be heated in the same time, and the thermal efficiency is higher, which is the environmentally friendly. The setting of the mechanical stabilizer is favorable for stabilizing the water flow when the influent water pressure fluctuates, so that the control of the water outflow temperature is more accurate. The setting of the memory alloy water flow rate regulating valve automatically adjusts the water flow when the external temperature changes, so that regulation of water flow is more timely, efficient and accurate, and thus the control of the water outflow temperature is more accurate. Compared with the electronic type, the mechanical flow stabilizer or the memory alloy type water flow rate regulating valve is simpler and more reliable in structure, smoother in operation, lower in cost, can be well applied to the vehicle environment. Water yield is guaranteed, and at the same time, the actual temperature of the effluent can reach or approach the setting temperature of the effluent.

