A gas distribution device and a gas water heater using the device

Abstract

The invention relates to a gas distribution device and a gas water heater using the device, wherein the gas distribution device includes a casing, a nozzle, a rotating shaft, a power mechanism and a blocking member, and at least one first valve for supplying gas into the casing is provided on the casing. There are at least two air inlets and nozzles arranged at intervals on the side wall of the housing. The rotating shaft extends axially along the direction in which the nozzles are arranged at intervals. The power mechanism is used to drive the rotating shaft to rotate around its own axis, and the blocking member is used to block the nozzles. There are at least two blocking members and each blocking member corresponds to a nozzle, and the blocking members at different positions and in different numbers move toward the nozzle with the rotation of the rotating shaft to block the gas flow entering the corresponding nozzle or move away from the nozzle to Open the corresponding nozzle. There are multiple blocking parts in this way, even if one of the blocking parts is worn out, the other blocking parts can still work normally, and the adjustment of the gas flow can still be carried out, and the fault tolerance rate is high.

Description

technical field [0001] The invention belongs to the technical field of fluid heaters with heat generating devices, and in particular relates to a gas distribution device and a gas water heater using the device. Background technique [0002] There is a defect in the use of gas water heaters or wall-hung boilers, that is, in summer, even if the gas is adjusted to the minimum gas supply, the water temperature is still too hot when showering, and the water temperature is not hot enough in winter. In order to solve the aforementioned problems, many manufacturers have adopted gas distributors (also known as gas sectionalizers or front pipes), that is, control valves are used to control the combustion of different nozzles on the gas distribution pipes, so as to achieve the size of the combustion firepower of water heaters and improve the efficiency of water heaters. range of adaptation. [0003] As shown in "A Gas Water Heater" disclosed by the Chinese Utility Model Patent No. ZL2...

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Problems solved by technology

[0004] The defects of the above-mentioned patents are: the number of stages that can be adjusted for combustion firepower is small (that is, the firepower adjustment level is small), and the adjustment gradient is too large, the control of the gas flow is not precise enough, and it is still easy to cause the minimum water temperature to be too high or the maximum water temperature to be too low phenomenon, it is difficult to meet the problems of regional differences, seasonal differences, and individual differences of people, which affects the comfort of users; in addition, the solenoid valve is large in size and high in cost. Considering the internal space and cost of the water heater, the existing gas flow distribution The device also needs to be further improved

[0007] However, this patent opens the nozzles in sequence from right to left through the translation of the piston, that is, the nozzles can only be opened or closed one by one, and cannot be opened or closed multiple times at one time, so the adjustment of the gas flow is not flexible and convenient; in addition, because The number of different nozzles can be opened through the translation of a piston. In order to prevent gas from entering the nozzle on the left side of the piston from the piston or sealing ring, there must be no gap between the outer wall of the piston or the sealing ring and the inner wall of the gas main pipe, and the gas flow rate The adjustment can only be realized by the movement of the one piston, and the piston or sealing ring is easy to wear, resulting in poor sealing; in addition, in order to make the piston or sealing ring move smoothly, lubricating grease is usually applied on the piston and sealing ring, but the grease is easy to Blockage of the nozzle; and, if the piston is worn out and loses its plugging effect, the gas flow regulation of the entire device fails

[0008] In addition, the method of opening the nozzles in sequence makes the fire power concentrated in a certain area, resulting in uneven combustion on one side of the heat exchanger, local high temperature problems, condensed water, and accelerated aging in parts with high frequency of use; in addition , the gas needs to be mixed with air to carry out the combustion reaction, and the air inlets supplying the air are evenly distributed. When burning on one side, the fresh air on the other side does not participate in the combustion, but is directly discharged through the heat exchanger. Outdoor, reducing the thermal efficiency when burning on one side

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