Gas water heater and control method thereof

Abstract

The invention discloses a gas water heater. The gas water heater comprises a heat exchanger and a water mixing water path; the heat exchanger is connected with a water incoming pipe and a water outgoing pipe, so that a water path can be formed; the water mixing water path is connected with the heat exchanger in parallel and provided with a control valve for controlling the opening and closing of the water path; and the water incoming pipe is provided with a pump for adjusting water incoming flow speed. The invention further discloses a control method of the gas water heater. According to the gas water heater of the invention, when the required heat load of the gas water heater is smaller than the minimum set value of the heat load, inflow water of the heat exchanger of the gas water heateris shunted, or the flow speed of the heat exchanger of the gas water heater is increased; and the gas water heater is controlled to operate at temperature larger than the minimum set value of the heat load. With the control method adopted, the gas water heater can adjust the temperature of outflow water which has been subjected to combustion heat exchange through the increased water flow speed, and therefore, the gas water heater is suitable for a working condition having a low-heat-load requirement, and the use range of the gas water heater is widened.

Description

technical field [0001] The present invention relates to a gas water heater in the field of water heaters, in particular to a gas water heater applicable to low heat load requirements, and in particular to a control method applied to the gas water heater. Background technique [0002] With the improvement of users' requirements for bathing water experience, more and more users hope to use lower temperature for bathing in summer. Working under the condition of high power and minimum heat load will still cause the problem of high outlet water temperature. Generally, the outlet water temperature of gas water heaters will exceed 40 degrees, which will seriously affect the user experience. [0003] In order to reduce the outlet water temperature of gas water heaters, the current common practice in the industry is to increase the number of fire row segments of gas water heaters, and use as few fire rows as possible to burn, so as to reduce combustion load and heat load. However, t...

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Problems solved by technology

[0004] 1. In order to increase the number of fire platoon segments (for example: from three segments to four segments or five segments), it is necessary to increase the solenoid valve of the gas proportional valve, resulting in poor versatility of the proportional valve and increasing production costs;

[0005] 2. Excessively reduce the combustion of the fire exhaust of the gas water heater, and it is easy to generate condensed water in the combustion chamber, which will corrode the heat exchanger, burner, and even the display and other components, and reduce the reliability of the product;

[0006] 3. With the increase in the number of burner segments and the reduction of the burning fire row in the minimum state, the possibility of fire transmission failure will increase, causing the smoke to exceed the standard and causing danger;

[0007] 4. When the user's water flow is low, the load of the ignition process is very large, which will cause the instantaneous temperature of the water outlet to be high, which may easily cause the risk of burns

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