Separate flow path type of gas-air mixing device

Abstract

According to the present invention, a gas-air mixing device used in a gas boiler comprises: a gas supply tube branched into a first gas flow path and a second gas flow path; an air supply tube branched into a first air flow path and a second air flow path by means of an air-flow-path branching apparatus; a pressure valve which is connected to the inlet port side of the gas supply tube in order to adjust the supply rate of gas being supplied to the gas supply tube; and a drive unit in which two valve bodies are connected to a rod that moves vertically up and down due to the magnetic force of an electromagnet; and the air-flow-path branching apparatus is formed so as to have a slot that can link through to either the first air flow path or the second air flow path, and so as to have a joining part which the rod can pass through in a position corresponding to the slot.

Description

technical field [0001] The present invention relates to a gas-air mixing device of a gas boiler, more specifically, to a flow path separation type gas-air mixing device for improving the regulation ratio. Background technique [0002] Generally, various types of boilers for heating are developed and used according to the required area or installation purpose, and there are gasoline boilers, gas boilers, and electric boilers depending on the fuel supplied. [0003] In such boilers, especially gas-fired boilers, as a method of burning gas fuel, in the case of premix burners, the combustion method is as follows: pre-mixing gas and air in a mixing ratio that is optimal for combustion After that, the mixed gas (air+gas) is supplied to the surface of the flame hole and combusted. [0004] In addition, the turn-down ratio (Turn-Down Ratio; TDR) is set in the gas boiler. The so-called turn-down ratio (TDR) refers to the difference between the maximum gas consumption and the minimum...

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Problems solved by technology

Therefore, in order to make the regulation ratio (TDR) 3:1, the differential pressure ratio needs to be 9:1, and in order to make the regulation ratio (TDR) 10:1, the differential pressure ratio needs to be 100:1. Problem: It is impossible to increase the gas supply pressure infinitely

[0022] In addition, since the temperature of the excess air is raised to the temperature of the exhaust gas, a part of the heat generated by fuel combustion is used to increase the temperature of the excess air, so that heat loss occurs

[0023] Therefore, when the figure 2 When the combustion device shown above is applied to a condensing boiler, there is a problem that it is difficult to expect high efficiency in a low output power range (that is, when combustion is performed only in the 1-stage region or 2-stage region).

However, in the above-mentioned manner, the other end falls in free fall due to its own weight, and when a negative pressure is applied by a blower, air flows in according to the pressure difference, and the separation membrane A is lifted up due to the speed of the inflowing air; The following problems: When the amount of air changes, the separation membrane vibrates up and down, and the operation is unstable

In addition, when dust or foreign matter etc. accumulate on the hinge, there is a problem of not running smoothly

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