JPH0324974Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a gas distributor for a pulse combustor used as a heating source for a hot water storage type water heater or the like.

[Conventional technology]

In a pulse combustor, a mixture of fuel gas and combustion air is sent to a combustion chamber and pulsatingly exploded and combusted.
For highly flammable gases such as Combustion flame enters the flame trap, causing a so-called backup fire phenomenon, and diffuse combustion tends to occur near the exit of the flame trap, making it difficult to achieve stable continuous combustion. Therefore, the applicant has filed an application first to solve the above drawback by adopting technical means to directly feed all or part of the fuel gas to the combustion chamber, mix it with combustion air in the combustion chamber, and cause explosive combustion. (Japanese Patent Application No. 59-98393), but as shown in FIG. The head 3' has a considerably thick wall (for example, the wall thickness is approximately 3 mm).
As a result, the mixing zone a′ of the fuel gas and combustion air increases significantly.In other words, the layer of fuel gas and the layer of combustion air mix only at this thickness, which causes backfire during ignition and ignition. Problems remained with regard to the stability of continuous combustion due to subsequent misfires (a phenomenon in which the air-fuel mixture stops detonating after several to tens of pulses are ignited) or knocking.

[The problem that the idea aims to solve]

This invention solves the above problems and provides a pulse combustor distributor that can provide stable continuous combustion at all times.

[Means to solve the problem]

This idea consists of a gas chamber 1 of a pulse combustor that feeds a mixture of fuel gas and combustion air to a combustion chamber and performs explosive combustion in a pulsating manner, and a distributor head 3 that is connected via a gas nozzle stand 2. Flame trap 6 interposed between chamber 4 and combustion chamber 5
The above problem was solved by taking technical measures to reduce the mixing zone a of fuel gas and combustion air by reducing the wall thickness of the tip of the gas distributor head 3. It is something.

[Effect]

Since this device has the above configuration, the mixing zone a of fuel gas and combustion air is reduced, and the mixing of fuel gas and combustion air in the combustion chamber 5 is performed at a location as far away from the flame trap 6 as possible. It accelerates ignition, prevents backfire during ignition, prevents misfires and knocking after ignition, and provides stable continuous combustion at all times.

〔Example〕

An embodiment of a gas distributor for a pulse combustor according to this invention will be described below with reference to the drawings.

In Fig. 1, 1 is a gas chamber provided in the gas supply system of the pulse combustor, 2 is a gas nozzle stand connected to the gas chamber 1, and 3 is a gas nozzle stand provided at the tip of the gas nozzle stand 2 so as to be freely attachable and detachable. In the distributor head, a thin end portion 3a is provided at the end to reduce the mixing zone a of the fuel gas and combustion air by reducing the wall thickness (for example, the wall thickness is preferably about 1 mm or less). established,
The end face of the thin end portion 3a is in contact with a frame trap 6 made of a thick porous plate interposed between the mixing chamber 4 and the combustion chamber 5. Note that if the thickness of the tip of the distributor head 3 is made thinner as in the embodiment, and at the same time the diameter is made smaller within a certain limit, the overall cross-sectional area will be reduced, so the mixing zone a
The reduction effect is doubled. At this time, the partition wall 7 of the gas nozzle stand 2 is
It is better to make the spatial cross-sectional area of the nozzle hole 8 larger.

In the figure, V ₁ is a disk-type vibrating valve for gas supply and disconnection in which a flapper valve 11 is interposed between a gas valve plate 9 and a back plate 10 that face each other with a very small gap, and V ₂ is a small gap. Air plate 12 and back plate 1 facing each other with
This is a disk-type vibrating valve for air supply/disconnection in which a flapper valve 14 is interposed between 3 and 3, and both the disk-type vibratory valve _V1 for gas supply/disconnection and the disk-type vibratory valve _V2 for air supply/disconnection are both The flapper valves 11 and 14 collide back and forth every cycle to automatically supply fuel gas and combustion air.

In the above configuration, the pulsating combustion mechanism of the pulse combustor is equalized in pressure in the gas chamber 1, and then the disk-type vibration valve V ₁ for gas supply/disconnection → the nozzle hole 8 of the gas nozzle stand 2 → the thin walled part 3a at the tip → the frame track The fuel gas is supplied to the combustion chamber 5 through the central path of the pump 6, and the fuel gas is supplied from the air supply blower to an air chamber (not shown), where the pressure is equalized and the air supply/disconnection disk is connected. type vibration valve
Combustion air supplied to the combustion chamber 5 along the path of V ₂ → mixing chamber 4 → the outer periphery of the flame trap 6 is mixed in a part of the combustion chamber 5 away from the flame trap 6, and at the beginning of combustion, Explosive combustion occurs in the combustion chamber 5 due to forced supply by an air supply blower etc. and forced ignition by a spark plug, but after a gradual period of time, the rotation of the air supply blower is stopped and the spark from the spark plug is also stopped. The cycle of air supply, explosive combustion, expansion, and exhaust is carried out through self-intake due to negative pressure and self-ignition due to exhaust heat, etc.
For example, the process shifts to steady combustion where self-combustion occurs continuously while repeating about 80 to 100 times per second, and the combustion exhaust gas is connected to the exhaust gas outlet of the combustion chamber 5 every cycle. This combustion method has characteristics such as high-load combustibility and high thermal conductivity, based on a combustion method in which the fuel is led to a heating source through a tail pipe connected to a hot water storage tank or the like.

[Effect of idea]

As explained above, this device has a simple structure in which the wall thickness of the gas distributor head 3 in the pulse combustor is reduced, and the mixing zone a of fuel gas and combustion air in the combustion chamber 5 is reduced. The mixing takes place at a location away from the flame trap 6, which speeds up ignition, prevents backfire, eliminates knocking and misfires after ignition, and stabilizes pulsating continuous combustion. It is.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of one embodiment of the gas distributor for a pulse combustor according to this invention, in use, Figure 2 is an enlarged front view of the flame trap, and Figure 3 is a cross-sectional view of a conventional example. be. 1... Gas chamber, 2... Gas nozzle stand,
3... Gas distributor head, 4... Mixing chamber, 5... Combustion chamber, 6... Flame trap,
a...Mixed zone.

Claims (1)

[Scope of utility model registration request] A mixture chamber 4 is connected to a gas chamber 1 of a pulse combustor which supplies a mixture of fuel gas and combustion air to a combustion chamber for explosive combustion in a pulsating manner, and a gas distributor head 3 connected via a gas nozzle stand 2. In the one that abuts the flame trap 6 interposed between the combustion chambers 5, the wall thickness of the tip of the gas distributor head 3 is thinned to reduce the mixing zone a of fuel gas and combustion air. A pulse combustor gas distributor characterized by: