JPH0120491Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a fuel gas supply path and a combustion air supply path through a backflow prevention valve mechanism at one end of the combustion chamber, and a combustion exhaust gas discharge path at the other end. Pulse combustion configured to connect a passageway to cause fuel gas and combustion air to flow into the combustion chamber by the dynamic inertia of combustion exhaust gas accompanying an explosion, and to cause an explosion by backflow of high-temperature combustion exhaust gas to the combustion chamber. Regarding equipment.

The above-mentioned pulse combustion device does not require energy for air supply or ignition other than starting, is capable of high-load combustion, and has an elongated exhaust path because the combustion exhaust gas pulsates and becomes extremely high pressure.
Although it has the advantage of efficiently heating the fluid using the exhaust path, conventionally the exhaust path 6 has been formed with a straight pipe as shown in FIG. It has the disadvantage that it takes a long time. In other words,
In the pulse combustion device, a resonance system for pressure fluctuations in the combustion chamber 1 is formed by the exhaust passage 6, and fuel gas and combustion air are supplied from the respective supply passages 3 and 5 through backflow prevention valve mechanisms 4a and 4b. The above-mentioned disadvantages arise because it is necessary to provide a reaction force for suction into the combustion chamber 1 through the flow resistance of the exhaust passage 6 in order to maintain good combustion.

Therefore, it is possible to make the pulse combustion device more compact by bending the discharge passage 6 vertically. , the problem arises that stable combustion cannot be continued due to clogging of the exhaust passage due to condensate.

In view of the above-mentioned circumstances, an object of the present invention is to avoid troubles caused by drain accumulation as described above while configuring the discharge passage to be vertically bent so that the pulse combustion device can be configured compactly.

The present invention provides the above-mentioned pulse combustion device in which the discharge passage is bent up and down, and a drainage passage is connected to the bent portion of the discharge passage from the descending passage portion to the ascending passage portion. The diameter of the flow path is 1/4 or less of the diameter of the discharge path.

In other words, if the condensate discharge flow passage is dimensioned as described above, the discharge passage can be easily opened without impairing the characteristics of the discharge passage necessary for combustion, such as forming a resonance system or imparting flow resistance. They discovered that it is possible to prevent combustion troubles caused by condensate accumulation at the bent part, and it has also become possible to reliably continue good pulse combustion while downsizing the pulse combustion device by vertically bending the discharge passage. .

Next, embodiments of the present invention will be described with reference to illustrative drawings.

As shown in FIG. 1, a combustion air supply path 3 equipped with an electric fan 2 is connected to the upper end side of the combustion chamber 1 via a backflow prevention valve mechanism 4a, and a backflow prevention valve mechanism 4b is connected to the upper end side of the combustion chamber 1. A fuel gas supply path 5 having a combustion chamber 1 is connected to the combustion chamber 1, a vertically bent exhaust path 6 forming a combustion exhaust gas exhaust path is connected to the lower end side of the combustion chamber 1, and a starting spark plug 7 is attached to the combustion chamber 1, Also,
A pulse combustion device is configured.

The operation of the above-mentioned pulse combustion device will be explained.
At startup, the electric fan 2 is operated to supply fuel gas and combustion air to the combustion chamber 1 at an appropriate mixing ratio,
Moreover, an explosion is caused within the combustion chamber 1 by the spark plug 7. As a result, appropriate amounts of fuel gas and combustion air are fed into the combustion chamber 1 from both supply paths 3 and 5 due to the dynamic inertia of the combustion exhaust gas accompanying the explosion, and then high-temperature combustion exhaust gas is fed into the combustion chamber 1 due to the reaction of the explosion. The combustion exhaust gas flows back into the combustion chamber 1 from the exhaust passage 6, causing another explosion due to the thermal energy of the combustion exhaust gas, and such an operation is repeated. Note that the operation of the electric fan 2 and the spark plug 7 is stopped when pulse combustion becomes stable.

A muffler 8 is connected to the discharge passage 6, and a case 9 is provided in which the combustion chamber 1, the discharge passage 6, the muffler 8, etc. are housed, a heated fluid supply passage 10 is provided at the lower end of the case 9, and the upper end of the case 9 A heated fluid discharge passage 11 is connected to each side to form a fluid heating chamber 12, thereby configuring a fluid heating device used in, for example, a water heater or a heater. In the figure, 13 is an exhaust path from the muffler 8.

Drain discharge flow passages 14 and 15 are connected to the bent portion 6c extending from the downward flow passage portion 6a to the upward flow passage 6b portion of the discharge passage 6 and the muffler 8, and the flow passages 14 and 15 are connected to the bent portion 6c. The diameter φ ₂ is set to be 1/4 or less of the diameter φ ₁ of the drain passage 6, preferably 3 mm or more in order to facilitate drainage.

Note that the number, shape, and dimensions of the discharge passages 6 can be changed arbitrarily, and the fuel gas supply passage 5 and the combustion air supply passage 3 may be connected on the upstream side of the backflow prevention valve mechanism 4a or 4b. , the mixed gas may be supplied to the combustion chamber 1.

The pulse combustion device according to the present invention can be used for various heating purposes or for utilizing exhaust energy.

[Brief explanation of drawings]

The drawings show an embodiment of the pulse combustion device according to the present invention, with FIG. 1 being a schematic longitudinal sectional view and FIG. 2 being a schematic longitudinal sectional view of a conventional example. 1... Combustion chamber, 3... Combustion air supply path, 4
a, 4b... Valve mechanism for backflow prevention, 5... Fuel gas supply path, 6... Discharge path, 6a... Downflow path portion,
6b...Rising flow path portion, 6c...Bending portion, 14...
...Flow path for drain discharge.

Claims (1)

[Scope of utility model registration request] On one end side of the combustion chamber 1, a backflow prevention valve mechanism 4a,
4b, the fuel gas supply path 5 and the combustion air supply path 3 are connected to the other end, and a combustion exhaust gas discharge path 6 is connected to the fuel gas supply path 5 and the combustion air supply path 3, and the combustion exhaust gas discharge path 6 is connected to the other end of the fuel gas supply path 5 and the combustion air supply path 3. A pulse combustion device configured to cause air to flow into the combustion chamber 1 and to cause an explosion by the backflow of high-temperature combustion exhaust gas into the combustion chamber 1, in which the exhaust passage 6 is bent vertically, A bent portion 6 extending from the descending passage portion 6a to the ascending passage portion 6b of the discharge passage 6
A drainage passage 14 is connected to c, and the diameter of the drainage passage 14 is 1/4 of the diameter of the discharge passage 6.
A pulse combustion device characterized by the following: