Condensate type fuel gas fast water heater

Abstract

The invention relates to the technical field of fuel gas water heaters, in particular to a condensate water heater. The condensate type fuel gas fast water heater comprises a main heat exchanger, a fan and a condensate heat exchanger. The fan is arranged on the main heat exchanger, and the fan is connected with the condensate heat exchanger. A sealing pad is arranged between an upper water sealingcover and a lower water sealing cover of a heat exchange body and the heat exchange body, and the heat exchange body comprises a first water inlet flow channel, a second water inlet flow channel, a first water outlet flow channel and a second water outlet flow channel. Due to the fact that the upper water sealing cover is provided with a first water passing groove and a second water passing groove, water flow can flow to the first water outlet flow channel from the first water inlet flow channel and flows to the second water outlet flow channel from the second water inlet flow channel, and two ways of water flow flow into a water outlet groove of the lower water sealing cover from the first water outlet flow channel and the second water outlet flow channel and combined. The heat exchangebody is simple in waterway, end face sealing of the heat exchange body is achieved in a non-welding manner, and heat exchange body water inlet and outlet channels are provided.

Description

technical field [0001] The invention relates to the technical field of gas water heaters, in particular to condensing water heaters. Background technique [0002] In the existing condensing gas instant water heaters, the condensing heat exchanger is mostly welded with sheet metal to form a sealed cavity, and the flue gas flow path is designed in the sealed cavity. Due to the formability of the sheet metal, the flue gas flow path cannot It is too complicated. Therefore, most of the condensing heat exchangers currently use flue gas to enter the condensing heat exchanger, then enter the heat exchanger from the lower space of the condensing heat exchanger shell, and the flue gas is directly discharged after heat exchange through the heat exchanger. During the heating process, the flue gas will produce condensed water when it is cold, and the condensed water will drip along the heat transfer surface in the direction of gravity. When the condensed water dripping direction is oppos...

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Problems solved by technology

[0002] In the existing condensing gas instant water heaters, the condensing heat exchanger is mostly welded with sheet metal to form a sealed cavity, and the flue gas flow path is designed in the sealed cavity. Due to the formability of the sheet metal, the flue gas flow path cannot It is too complicated. Therefore, most of the condensing heat exchangers currently use flue gas to enter the condensing heat exchanger, then enter the heat exchanger from the lower space of the condensing heat exchanger shell, and the flue gas is directly discharged after heat exchange through the heat exchanger. During the heating process, the flue gas will produce condensed water when it is cold, and the condensed water will drip along the heat transfer surface in the direction of gravity. When the condensed water dripping direction is opposite to the flue gas flow direction, it is easy to form a liquid film on the heat transfer surface, and the flue gas cannot directly In contact with the heat exchange surface, the heat exchange efficiency of the heat exchange body is bound to decrease

In addition, the water inlet and outlet joints of the existing shell-and-tube ordinary aluminum heat exchanger are welded with aluminum material and the heat exchanger. When an aluminum condensation heat exchanger is used, a potential difference is likely to occur between the metal shell and the heat exchanger, resulting in The electrochemical corrosion of the heat exchange body is serious, and it is easy to cause water leakage in the condensing heat exchanger. This phenomenon is particularly prominent in areas with poor water quality in my country, such as the Northwest and Northeast and the Huaihe River Basin. Finally, stainless steel with high corrosion resistance is used. The material is used as the base material of the heat exchange body. This solution has better performance in terms of corrosion resistance. However, if stainless steel is to be made into a closed space, welding methods are required, including heat exchange body welding and shell welding. The process guarantee requirements are relatively high, and Due to the presence of impurities in the weld, the stress at the weld is relatively concentrated, and it is easy to become the weak link of the condensing heat exchanger

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