JPS61101706A - Pulse burner - Google Patents

Abstract

PURPOSE:To provide a small-sized pulse burner of which operation is calm and of which composition is simple by a method wherein an ejector producing an effect of ejector is arranged at the downstream side of tail pipes of a plurality of pulse burners. CONSTITUTION:When a pulse burner 1 is ignited, combustion air 24 is passed through an air supplying part 18, air supplying decoupler 17 and an air check valve 7 under an operation of a blower fan and then it is supplied to the combustion chamber 3. Then, a pulse burner 2 is ignited. The ignited gas is flowed out of an outer cylinder 21 connected to the extremity ends of the tail pipes 6 into the discharging decoupler 22. At this time, the combustion gas flowed out of the inner cylinder 20 of the burner 1 shows a high speed and produces a negative pressure area in the outer cylinder 21. The combustion gas of the burner 2 is sucked by this negative pressure. In case that a different frequency is found in the burners 1 and 2 upon ignition, the burner 2 shows that the timing of ignition for the pulse type combustion gradually approaches to the timing of ignition of the burner 1 under an action of the sucking in the burner 1. That is, the pulse frequency of the burner 2 approaches to the pulse frequency of the burner 1, resulting in showing a synchronous combustion.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a pulse combustor that serves as a heat source for water heaters and space heaters for domestic, commercial or industrial use.

Conventional technology Conventionally, pulse combustors have a high flow rate of combustion gas and are pulsating, so they can be used as water heaters and space heaters with high heat exchange efficiency.Furthermore, they do not require a power source except when starting. It was attracting attention as an energy-saving device. However, combustion noise is large, and various noise reduction methods have been investigated. Among these, the method of dividing the burner and burning in multiple burners is often used as a method of reducing combustion noise because the combustion noise in the same combustion chamber is lower than that of a single burner. n has arrived. In other words, the method of burning in parallel with multiple burners is promising as a method of reducing combustion noise in a pulse combustor. In the case of combustion with a burner, the combustion sound was reduced to 4.6 dB in the latter case.

Problems to be Solved by the Invention However, each pulse burner has a different combustion amount, suction air amount,
A slight difference in purchasing dimensions, etc. will cause a difference in pulse frequency. As a result, the combustion noise of each pulse burner interfered with each other, producing a harsh humming sound.

Furthermore, if a single co-air decoupler is provided in common for each pulse burner, there is a drawback that pressure acts through the exhaust decoupler, making combustion unstable. On the other hand, if an n-exhaust decasopra is provided for each pulse burner, the structure would be complicated and larger than that of a single burner.

The present invention eliminates the above-mentioned conventional drawbacks, prevents the generation of whining noise, and shares an exhaust decoupler for each pulse burner, thereby providing a compact pulse combustion device with quiet operation and simple configuration. This is what we provide.

Means for Solving All Problems The present invention provides a number of pulse burners each having an air check valve and a fuel supply passage at one end of the combustion chamber and a tail pipe at the other end, and a common exhaust decoupler for each pulse burner. An ejector is provided upstream of this exhaust decoupler, and this ejector has a groove formed from the inner cylinder and the outer cylinder, and the tail pipe of each pulse burner is connected to the inner cylinder and the outer cylinder, respectively. It is something.

Effect Based on the above configuration, when the pulse bar connected to the inner cylinder is ignited, and then the pulse burner connected to the outer cylinder is ignited,
The combustion gas ejected from the inner cylinder forcibly discharges the combustion gas from the outer cylinder due to the ejector effect. As a result, each pulse burner burns synchronously, and no humming noise is generated.

Real sister example Hereinafter, an example of the present invention will be explained with reference to the drawings.

In the figure, 1 and 2 are pulse burners, 3 and 4 are twisting chambers, and 6
, 6 is a tail pipe, 7 and 8 are air check valves, 9.10 is a fuel supply path, 11.12 is a gas pulp, -13,1
4 is a gas distributor, 15.16 is an igniter, 1
7 is a supply air decoupler, 18 is an air connection part, 19 is an ejector,
2Q is the inner cylinder, 21 is the external cylinder, 22 is the exhaust decasogura, 23
is the exhaust part, 24 is the combustion air, 25.26 is the fuel gas,
27 is exhaust gas, and the above constitutes a pulse combustion device.

The pulse burners 1, 2 are connected to a common supply decasoplar 13 and exhaust decasoplar 22. exhaust big
An ejector 19 is provided upstream of the single puller 22.

The inner cylinder 20 is a nozzle, the outer cylinder 21 is a diffuser, and the outer cylinder 21 is located around the inner cylinder 20.

A tail pipe 6 of the pulse burner 1 is connected to the inner cylinder 20, a tail pipe 6 of the pulse burner 2 is connected to the outer pipe 21, and further connected to an exhaust decoupler 22. Air supply section 18. The exhaust section 23 has air supply 77 (not shown) for reducing combustion noise.

Equipped with 77 exhaust vents.

In the above configuration, first the pulse burner 11t.

Burn it. Combustion air 22 is supplied by a blower fan (not shown)
From the air supply section 18. Air supply decanogler 17° air check valve 7
through which it is supplied to the combustion chamber 3.

The fuel gas 26 passes through a gas valve 11 provided in the fuel supply path 9 and flows into the combustion chamber 3 from the gas distributor 13 . When ignited by the igniter 15, a pulse combustion occurs, and the exhaust gas is discharged at a high speed, passing through the inner cylinder 2o provided in the ejector 19 at the tip of the tail pipe 5 and flowing out to the exhaust decoupler 22. do. Exhaust decoupler 2
In case 2, the pressure fluctuation of the exhaust gas becomes small and the exhaust gas is discharged from the exhaust section 23.

Next, the pulse burner 2 is fired. Combustion gas flows out from an outer cylinder 21 connected to the tip of the tail pipe 6 to an exhaust decoupler 23. At this time, the combustion gas flowing out from the inner cylinder 2o of the pulse burner 1 is at a high speed and generates a negative pressure region in the outer cylinder 21. By this negative pressure, all of the combustion gas from the pulse burner 2 is sucked. After ignition, if the pulse frequencies differ between the pulse burners 1 and 2, the ignition timing of pulse combustion in the pulse burner 2 gradually approaches the ignition timing of the pulse burner 1 due to the suction action of the pulse burner 1.

That is, the pulse frequency of pulse burner 2 is the same as that of pulse burner 1.
The pulse frequency approaches , and the combustion transitions to synchronous combustion.

As a result, the pulse burners 1 and 2 maintain combustion without buzzing noise, and the combustion noise is smaller than when one pulse burner is burned with the same combustion amount. Furthermore, since the exhaust decoupler is shared, the structure is simple and can be made compact.

Effects of the Invention As is clear from the above explanation, according to the present invention, by providing an ejector that produces an ejector effect on the downstream side of the tail pipe of a plurality of pulse burners, it is possible to synchronously burn a plurality of burners. , Moreover, the exhaust decanogram can be shared, and as a result, the combustion/combustion sound Fo
It is possible to provide a compact pulse combustion device.

[Brief explanation of the drawing]

The figure is a sectional view of a pulse combustion device showing an example of the present invention. 1.2... Pulse burner, 17... Ejector, 18... Inner cylinder, 19... Outer cylinder,
20...Exhaust decoupler.

Claims (1)

[Claims] A plurality of burners having an air check valve and a fuel supply passage at one end of the combustion chamber and a tail pipe at the other end are arranged in parallel, a common exhaust decoupler is provided downstream of each pulse burner, and an ejector is provided upstream of the exhaust decoupler. The ejector is a pulse combustion device consisting of an inner cylinder and an outer cylinder that communicate with the tail pipe.