Premixing apparatus

一种预混合、空气供应的技术，应用在气体燃料燃烧器、燃烧方法、燃烧类型等方向，能够解决燃料气体吸引力变弱、增大燃气供应路通气阻力、混合气体空燃比分布不均等问题，达到防止分布不均的效果

Active Publication Date: 2016-02-10
RINNAI CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the gas resistance switching mechanism is constituted by a valve that branches the downstream end of the gas supply path into two branch paths connected to the second air path, and controls the connection of the air supply path with respect to one branch path. In this way, the ventilation resistance of the gas supply path is increased by blocking the connection port.
[0008] However, according to this, when the ventilation resistance of the air supply path is increased, since the air flows only in the second air path, negative pressure is hardly generated, and the attractive force of the fuel gas becomes weak, making it difficult to introduce the gas stably.
In addition, in the case of reducing the ventilation resistance of the air supply path by letting air also flow in the first air passage, since the fuel gas is only introduced into the second air passage, the fuel gas does not flow well with the first air passage. The air in the channel is mixed, and the air-fuel ratio of the mixed gas is prone to uneven distribution

Method used

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Examples

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Embodiment Construction

[0022] refer to figure 1 , 1 is a burner composed of an all-primary combustion burner, etc., and the burner has a combustion surface 1a for ejecting and burning the mixed gas. The blower 2 is connected to the burner 1, and the fuel gas is mixed with the air by the premixing device A according to the embodiment of the present invention, and the mixed gas is supplied to the burner 1 through the blower 2 .

[0023] The premixing device A includes an air supply passage 3 on the upstream side of the blower 2 and a gas supply passage 4 for supplying fuel gas. On the upstream portion of the gas supply path 4, an on-off valve 5 and a flow rate regulating valve 6 composed of a proportional valve or a zero pressure regulator are provided. In addition, the premixing device A has: an air resistance conversion mechanism for converting the magnitude of the ventilation resistance of the air supply passage 3; Gas resistance conversion mechanism.

[0024] refer to figure 2 The air resista...

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PUM

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Abstract

A premixing apparatus for mixing a fuel gas with air has an air resistance changeover device for changing over a flow resistance in the air feed passage and a gas resistance changeover device for changing over a flow resistance in the gas feed passage. The air resistance changeover device includes a venturi portion provided in that part of the air feed passage which is on a downstream side of the butterfly valve. A gas chamber is provided in that part of the gas feed passage which is on a downstream side of the gas resistance changeover device. A gas suction portion is configured such that the fuel gas is sucked from the gas chamber into an entire circumference of that part of the air feed passage which is adjacent to a downstream side of the venturi portion.

Description

technical field [0001] The present invention relates to a premixing device for mixing fuel gas with air and supplying the mixed gas to a burner through a blower. Background technique [0002] Conventionally, as such a premixing device, according to Patent Document 1, there is known a premixing device including an air resistance conversion mechanism that connects the downstream end of a gas supply path that supplies fuel gas and is provided with a flow control valve to a blower. The air supply path on the upstream side of the air supply path, and converts the ventilation resistance of the air supply path; and the gas resistance conversion mechanism, which converts the ventilation resistance of the part of the gas supply path on the downstream side compared to the flow regulating valve. [0003] However, as a flow regulating valve, in the case of using a proportional valve, the proportional valve is controlled so as to supply the fuel gas in an amount corresponding to the requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/62
CPCF23D14/62F23D14/34
Inventor 中谷立好宇於崎充
Owner RINNAI CORP
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