JPH0144882Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention is a pulse combustion device that repeatedly supplies air and fuel into a combustion chamber, burns an air-fuel mixture in the combustion chamber, and exhausts exhaust gas from the combustion chamber. Regarding improvements.

[Technical background of the invention]

Generally, air and fuel are supplied into the combustion chamber through an air supply passage and a fuel supply passage, respectively,
After the mixture of air and fuel is combusted in the combustion chamber, it is exhausted through an exhaust passage connected to the combustion chamber, and a flapper valve opens and closes based on the combustion state of the mixture in the combustion chamber. When the mixture is combusted, the flapper valve is closed to stop the supply of air and fuel into the combustion chamber, and when the mixture has finished combustion, the flapper valve is opened to supply air and fuel into the combustion chamber. Pulse combustion devices of this configuration are known. By the way, in this type of combustion chamber, a plate-shaped flame stabilizing member having a large number of pores has conventionally been disposed inside the combustion chamber. After the mixture in the combustion chamber is ignited by the spark plug during startup, the flame is held by this flame-holding member, and the mixture of air and fuel supplied into the combustion chamber is ignited by the flame-holding member. The structure was such that it could be ignited by

[Problems with background technology]

Since the plate-shaped flame stabilizing member was disposed within the combustion chamber, there was a problem in that the flow resistance of the air-fuel mixture within the combustion chamber became large. Therefore, when mufflers are installed before and after the combustion chamber to reduce the explosion noise generated when the air-fuel mixture is combusted in order to reduce noise, the amount of air supplied into the combustion chamber tends to be insufficient. This resulted in the disadvantage that the content of carbon monoxide in the exhaust gas increased. Furthermore, since the inside of the combustion chamber is partitioned by a flame-holding member, there is also the drawback that the combustion range is narrowed.

[Purpose of invention]

This idea can lower the flow resistance of the air-fuel mixture within the combustion chamber without impairing the flame-holding function, and even when mufflers etc. are installed before and after the combustion chamber, carbon monoxide in the exhaust gas can be reduced. It is an object of the present invention to provide a pulse combustion device that can prevent an increase in the amount of fuel and also make the combustion range relatively wide.

[Summary of the idea]

This device ignites a mixture of air and fuel guided through an air supply path and a fuel supply path in a fuel chamber to cause explosive combustion, and an exhaust path is provided to connect the combustion gas to the combustion chamber. In a pulse combustion device that continuously repeats pulsating combustion in which a new air-fuel mixture is exhausted through the combustion chamber and then is explosively combusted again after being introduced into the combustion chamber, a cylinder that can be ventilated in the direction of flow of the combustion gas in the combustion chamber. A flame holding device is provided, and a spark plug for starting explosive combustion is placed inside the flame holding device.

[Example of idea]

Figure 1 shows one embodiment of this invention.
is the main body of the pulse combustion device. The interior of the main body 1 is partitioned into a combustion chamber 3 and an air storage chamber 4 by a partition wall 2. Furthermore, the main body 1 has a combustion chamber 3.
A tail pipe 5 communicated with is connected, and
An air supply pipe 6 communicating with the air storage chamber 4 is connected. Further, an ignition device main body 7 is attached to the center of the partition wall 2. The ignition plug 8 of the ignition device main body 7 is disposed approximately in the center of the combustion chamber 3. Furthermore, a ring-shaped air introduction chamber 9 is formed in the partition wall 2, and this air introduction chamber 9
A ring-shaped combustion chamber 10 is formed outside of the combustion chamber 10 . The air introduction chamber 9 and the air storage chamber 4 are separated by a partition wall 11. Communication holes 12 are formed in this partition wall 11.
The air storage chamber 4 and the air introduction chamber 9 are communicated with each other via... In addition, the air introduction chamber 9 has an air passage 13.
It communicates with the inside of the combustion chamber 3 via. and,
Air storage chamber 4, air introduction chamber 9 and air passage 13
An air supply path 14 is formed which guides the air sent from the air supply pipe 6 into the combustion chamber 3. In addition, the combustion chamber 10 includes an orifice component 15.
A fuel supply pipe 17 is connected via a connecting member 16 provided with. Further, a ring-shaped fuel introduction chamber 18 is formed between the fuel storage chamber 10 and the combustion chamber 3. The fuel introduction chamber 18 and the fuel storage chamber 10 are separated by a partition wall 19. Communication holes 20 are formed in the partition wall 19, and the fuel storage chamber 10 is connected to the fuel storage chamber 10 through the communication holes 20.
and the fuel introduction chamber 18 are communicated with each other. Further, the fuel introduction chamber 18 is communicated with a large number of jet nozzles 21 formed in the partition wall 2 via fuel passages 22. These jet nozzles 21 are opened toward the inside of the combustion chamber 3, and guide the fuel sent from the fuel supply pipe 17 into the combustion chamber 3 through the fuel storage chamber 10, the fuel introduction chamber 18, and the fuel passage 22. A fuel supply path 23 is formed. Furthermore, an air flapper valve 2 is provided in the air introduction chamber 9 and the fuel introduction chamber 18.
4 and a fuel flapper valve 25 are respectively provided. These air flapper valve 24 and fuel flapper valve 25 are adapted to be moved and operated based on the combustion state of the air-fuel mixture within the combustion chamber 3. When the air-fuel mixture is combusted, the pressure inside the combustion chamber 3 causes the air flapper valve 24 to
is pressed against the partition wall 11, the communication holes 12... are closed, and the fuel flapper valve 25 is pressed against the partition wall 19.
, the communication holes 20 are closed, and the supply of air and fuel into the combustion chamber 3 is stopped. Further, at the end of combustion of the air-fuel mixture, the exhaust gas in the combustion chamber 3 is exhausted through the tail pipe 5, and the air flapper valve 24 and fuel flapper valve 25 are separated from the partition walls 11, 19, respectively, and the communication holes 12... , 20... are opened, and air and fuel are supplied into the combustion chamber 3.

On the other hand, inside the combustion chamber 3, a constriction part 26 that constricts the flow path of the air-fuel mixture and a cylindrical flame stabilizer 27 integrally formed with the constriction part 26 are provided. The cylindrical flame stabilizer 27 has a larger opening area than the throttle part 26, and is arranged downstream of the throttle part 26 in the air-fuel mixture flow path in the combustion chamber 3. An ignition plug 8 is disposed inside this cylindrical flame holder 27, and after the air-fuel mixture in the combustion chamber 3 is ignited by the ignition plug 8 during startup, the cylindrical flame holder 27 As a result, the air-fuel mixture combusted within the combustion chamber 3 is flame-stabilized.

Therefore, in the case of the above structure, the air and fuel supplied through the air supply path 14 and the fuel supply path 23 are mixed on the partition wall 2 side in the combustion chamber 3, and then passed through the throttle section 26. Cylindrical flame stabilizer 27
sent to. Then, at the time of starting, this mixture is ignited by the spark plug 8. When the air-fuel mixture is ignited, an explosion occurs within the combustion chamber 3.
The internal pressure rises rapidly, the air flapper valve 24 and the fuel flapper valve 25 are closed, and high-temperature exhaust gas is exhausted through the tail pipe 5. In this case, a part of the exhaust gas in the combustion chamber 3 remains in the combustion chamber 3 and is flame stabilized by the cylindrical flame stabilizer 27 . Then, when the air flapper valve 24 and the fuel flapper valve 25 are opened to supply air and fuel into the combustion chamber 3, this new air-fuel mixture is heated to a high temperature that is flame-stabilized by the cylindrical flame stabilizer 27. It is ignited by the residual gas, and thereafter the explosion and expansion are repeated at a frequency of about 50 to 100 Hz.

Thus, in the case of the above configuration, the combustion chamber 3
A cylindrical flame stabilizer 27 is used to stabilize the flame of the air-fuel mixture combusted within the cylindrical flame stabilizer 27.
Since this is done by , the flow resistance of the air-fuel mixture in the combustion chamber 3 can be lowered compared to the case where a plate-shaped flame stabilizing member is provided in the combustion chamber.
Further, since the air-fuel mixture mixed in the combustion chamber 3 is guided to the cylindrical flame stabilizer 27 through the throttle section 26, the flow velocity of the air-fuel mixture can be increased above the combustion speed. Therefore, the air-fuel mixture supplied into the combustion chamber 3 can be smoothly guided to the cylindrical flame stabilizer 27 through the throttle part 26, so even when a muffler or the like is installed before and after the combustion chamber 3. However, unlike conventional systems, there is no shortage of air, and an increase in carbon monoxide in the exhaust gas can be reliably prevented. In addition, a cylindrical flame stabilizer 27 is provided with the axis line along the flow direction of combustion gas, and the spark plug 8 is placed inside this cylindrical flame stabilizer 27, making it easier to start explosive combustion. Not only this, but also the force applied to the cylindrical flame stabilizer 27 during explosive combustion can be suppressed to a small value, and the durability of the cylindrical flame stabilizer 27 can be improved. Furthermore, combustion chamber 3
Since a plate-shaped flame stabilizing member unlike the conventional one is not disposed inside the combustion chamber 3, the interior of the combustion chamber 3 can be effectively used, and the combustion range can be expanded compared to the conventional one. Furthermore, since the air flapper valve 24 and the fuel flapper valve 25 are provided in the air supply passage 14 and the fuel supply passage 23 outside the combustion chamber 3, respectively, compared to the case where the flapper valve is provided inside the combustion chamber 3, The influence of heat within the combustion chamber 3 can be reduced, and the durability of the air flapper valve 24 and the fuel flapper valve 25 can be improved.

Next, another embodiment shown in FIG. 2 will be described. This consists of the base plate 31 and cylinder 32.
The main body of the pulse combustion device is formed by the above. A combustion chamber 33 is formed inside the cylinder 32 . Further, a control plate 3 is provided on the base plate 31 to face the combustion chamber 33.
4 are arranged to be replaceable as appropriate, and an ignition device main body 35 is attached to the center. The spark plug 36 of this ignition device main body 35 is connected to the combustion chamber 33.
It is located approximately in the center of the Furthermore, a ring-shaped fuel introduction chamber 37 and a ring-shaped air introduction chamber 38 are formed in the base plate 31, respectively. The fuel introduction chamber 37 is connected to a fuel supply pipe 40 via a first fuel introduction hole 39, and
Second fuel introduction hole 41... and control plate 34
It communicates with the inside of the combustion chamber 33 through the injection holes 42 . The air introduction chamber 38 is connected to an air supply pipe 44 via a first air introduction hole 43, and is connected to the combustion chamber via a second air introduction hole 45 and an ejection port 46 of the control plate 34. It is connected to the inside of 34. Furthermore, the first fuel introduction hole 3
A fuel flapper valve 47 is disposed within the first air introduction hole 43, and an air flapper valve 48 is disposed within the first air introduction hole 43. Also, inside the combustion chamber 33, there is a constriction part 49 that restricts the flow path of the air-fuel mixture, and a cylindrical retainer whose opening area is expanded larger than the constriction part 49 to stabilize the flame of the air-fuel mixture combusted within the combustion chamber 33. A flame body 50 is provided, and the cylindrical flame stabilizer 50 is arranged downstream of the throttle part 49 in the air-fuel mixture flow path.

Even with this configuration, since the throttle part 49 and the cylindrical flame stabilizer 50 are provided in the combustion chamber 33, the flow resistance of the air-fuel mixture can be lowered as in the previous embodiment. At the same time, the combustion range can be widened. Furthermore, in this case, a ring-shaped fuel introduction chamber 37 and a fuel supply pipe 4 are provided.
A fuel flapper valve 47 is disposed in the first fuel introduction hole 39 that communicates between the ring-shaped air introduction chamber 38 and the air supply pipe 44. Since the air flapper valve 48 is disposed within the introduction hole 43, it can be made less susceptible to the influence of heat within the combustion chamber 33. Furthermore, the shapes of the flapper valves 47 and 48 can be simplified compared to the case where the fuel flapper valve 47 and the air flapper valve 48 are arranged in the fuel introduction chamber and the air introduction chamber, and the shape of the pulse combustion apparatus body can be simplified. Both flapper valves 47, 48 due to the vibration of
It is possible to prevent malfunctions, increase the reliability of operation, and increase the reliability of the entire pulse combustion device. Further, since the control plate 34 is provided in a replaceable manner, the size of the jet ports 42 can be changed as appropriate depending on the type of fuel, and it can be used regardless of the type of fuel.

It should be noted that this invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of this invention.

[Effect of idea]

According to this invention, a cylindrical flame holding device that can be ventilated in the direction of flow of combustion gas is provided inside the combustion chamber, and a spark plug for starting explosive combustion is placed inside the flame holding device. It is possible to lower the flow resistance of the air-fuel mixture within the combustion chamber without sacrificing functionality, reliably prevent an increase in carbon monoxide in the exhaust gas, and widen the combustion range compared to conventional models. Moreover, it is possible to improve the starting characteristics and the durability of the flame stabilizing device.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the overall schematic structure of one embodiment of this invention, and FIG. 2 is a longitudinal cross-sectional view showing the schematic structure of another embodiment. 3, 33... Combustion chamber, 14... Air supply path, 2
3... Fuel supply path, 24, 48... Air flap valve, 25, 47... Fuel flap valve, 26, 49
...Aperture part, 27,50...Cylindrical flame stabilizer.

Claims (1)

[Scope of utility model registration request] The mixture of air and fuel guided through the air supply path and the fuel supply path is ignited in the combustion chamber to cause explosive combustion, and the combustion gas is exhausted through an exhaust path provided in connection with the combustion chamber. In a pulse combustion device that continuously repeats pulsating combustion in which a new air-fuel mixture is introduced into the combustion chamber and then exploded and combusted again, a cylindrical flame-holding device that can be ventilated in the direction of flow of the combustion gas in the combustion chamber is used. What is claimed is: 1. A pulse combustion device characterized in that a spark plug for starting explosive combustion is arranged inside the flame holding device.