JPS6093210A - Pulse burning type heating device - Google Patents

Abstract

PURPOSE:To improve the igniting ability of an ignition device at the starting of operation by a method wherein a mixing chamber connected to the upperstream side of a burning chamber is arranged at the outside of a vessel, and the ignition device for the firing at the starting of operation is provided in the mixing chamber. CONSTITUTION:A burning chamber 23 of a pulse burning device 21, a tail pipe 37, a coupler 38 and a heat exchanger 39 are arranged inside a hot-water tank 22, a mixing chamber 24 is arranged in detachably attached manner at the outside of the hot-water tank 22, while an igniting plug 30 and a flame rod 31 are respectively provided in the mixing chamber 24. Thereby, the deterioration of insulation and the like of the igniting plug 30 and the flame rod 31 can be reduced. Further, the igniting plug 30 is prevented from cooling due to the direct contacting to a water inside of the hot-water tank 22, accordingly, at the starting of the pulse burning device 21, the igniting plug 30 is prevented from unsteady operation, consequently, the operational reliability of the igniting plug 30 can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a pulse combustion type heating device that heats a fluid to be heated contained in a container using a pulse combustion device.

[7 Technical aspects of the invention and its problems 3 Figure 11 shows the schematic configuration of the entire pulse combustion device.
1 is a combustion chamber, and 2 is a cylindrical mixing chamber disposed upstream of this combustion chamber I. One end of each of an air supply pipe 3 and a fuel supply pipe 4 are connected to the mixing chamber 2.

Furthermore, air is supplied to the air supply pipe 3 via an air supply muffler 5, an air flapper valve 6, and the like. Furthermore, the fuel supply pipe 4 has a fuel flapper valve 8.
Fuel gas is supplied via the The air and fuel gas introduced into the mixing chamber 2 through the air supply pipe 3 and the fuel supply pipe 4 are mixed within the mixing chamber 2, and then exploded and combusted within the combustion chamber 1. . In this case, at the time of startup, air is supplied into the air supply pipe 3 by a blower fan (not shown), and the mixture of air and fuel gas mixed in the mixing chamber 2 is ignited by the ignition plug (ignition device) 9. , explosive combustion occurs within the combustion chamber 1. After starting, the air flapper valve 6 and the fuel flapper valve 8 are intermittently opened and closed by the explosion pressure of the mixture in the combustion chamber 1, and air and fuel are intermittently supplied, and the air inside the combustion chamber I is The air-fuel mixture supplied into the combustion chamber I is ignited by contact with the high-temperature residual gas, the inner wall, etc., and explosive combustion is repeated in a pulsed manner. Further, a tail pipe XO is connected to the combustion chamber I.

The exhaust gas in the combustion chamber 1 is discharged from the tail pipe SO to the outside via a decoupler 11, a heat exchanger 12, and an exhaust muffler 13. Note that 14 is a flame rod that detects the ignition state within the combustion chamber I.

By the way, conventionally, a pulse combustion device has been disposed inside a hot water storage tank (container) containing a fluid to be heated such as water.
A hot water storage type water heater (pulse combustion type heating device) has been developed that is configured to heat water in a hot water storage tank by heat exchange with combustion gas discharged from a combustion chamber l. However, in the conventional configuration described above, pulse pj 417. Since the combustion chamber 1 and the mixing chamber 2 of the device are arranged respectively, the insulation of the spark plug 9 and the flame rod I4 tends to deteriorate, which poses a problem in terms of manufacturability.
There was a problem in that the attachment/detachment procedure was troublesome, and maintenance and inspection work became troublesome. Furthermore, when the pulse combustion device is not operating, the spark plug 9 is cooled by the low-temperature water stored in the hot water storage tank, so the operation of the spark plug 9 tends to become unstable when the pulse combustion device is started. There was also the problem of poor ignitability.

[Purpose of the invention]

An object of the present invention is to provide a pulse combustion type heating device that can improve the ignition performance of the ignition device at the start of fjl+.

[Summary of the invention]

A combustion chamber of the pulse combustion device is disposed inside a container that accommodates the fluid to be heated, and a mixing chamber connected to the upstream side of the combustion chamber is disposed outside the container. It is characterized by being equipped with an ignition device for ignition.

[Embodiments of the invention]

FIGS. 2 to 7 show an embodiment of the present invention. Figure 2 shows the hot water storage tank (
2 shows a schematic configuration of the entire hot water storage type water heater (pulse combustion type heating device) that heats water (heated fluid) in a container) 22, and 23 is a combustion chamber of a pulse combustion device 21. This combustion chamber 23 is arranged at the inner bottom of the hot water storage tank 22.

Further, a cylindrical mixing chamber 24 with a bottom is connected to the upstream side of the combustion chamber 23 . A flange-shaped attachment portion 25 is formed at the open end of the mixing chamber 24 . and,
This mixing chamber 24 is arranged outside the hot water storage tank 22, and a mounting portion 25 is attached to the bottom plate 26 of the hot water storage tank 22 with screws 27.
1.・Removably attached.

Furthermore, one end of each of an air supply pipe 28 and a fuel supply pipe 29 is connected to the peripheral wall surface of the closed end side of the mixing chamber 24, as shown in FIGS. 3 and 4. in this case,
The air supply '(f2s) is connected along the substantially circumferential direction of the mixing chamber 24, and the air introduced into the mixing chamber 24 from the air supply pipe 28 is mixed as shown by the solid line arrow in FIG. The fuel fJ(
The supply pipe 29 is connected approximately in the circumferential direction of the mixing chamber 24 with a yoke that faces the swirling direction of the vortex formed by the air introduced into the mixing chamber 24 from the air supply pipe 28 . Also,
An ignition plug (igniter) 30 for ignition during startup and a frame rod 31 for detecting the ignition state are respectively attached to the peripheral wall surface of the mixing chamber 24 (CG). Furthermore, as shown in FIG. The first position is the intersection of the air jetting direction N from the air supply 1 28 and the fuel jetting direction B from the fuel supply pipe 29.
Within the range from the limit position ①, a to the second limit `J￥ which is the fuel gas injection position from the fuel supply pipe 29, and as shown in FIG. 4, the center line O of the mixing chamber 24 For the direction,
Fuel gas injection position from fuel supply pipe 29 and combustion chamber 23
downstream side (distance g
) is placed at an appropriate position e within the mounting range. Further, an air supply muffler 33, an air flapper valve 34, etc. are connected to the air supply pipe 28, and a cushion tank 35 for absorbing the pulsation of the fuel gas flow due to pulse oscillation is connected to the fuel supply pipe 2g. Flapper valves 36 and the like are connected to each other.

In this case, the vibration caused by the pulse oscillation is absorbed by the cushion tank 35, and transmission of the vibration to other equipment is prevented.

The air introduced into the air supply pipe 28 is introduced into the mixing chamber 24 via the air muffler 33 and the air flapper valve 34, and the fuel gas introduced into the fuel supply Wzy is introduced into the cushion tank 35 and the air flapper valve 34. The fuel is introduced into the mixing chamber 24 via the fuel valve 36 and the like,
These air-poor e' and s materials are mixed in the mixing chamber 24, and at the time of starting, the ignition plug 3° ignites the air (combustion air) and explodes and burns it in the combustion chamber 23.
After startup, the air flapper valve 34 and the fuel flapper valve 36 are intermittently opened and closed by the explosion pressure, and air and fuel are intermittently supplied into the mixing chamber 24, causing combustion to occur in pulses within the combustion chamber 23. It's starting to turn around. Further, a tail pipe 3 is provided at the upper end of the combustion chamber 23.
One end of 7 is connected. The other end of this tail pipe 37 is connected to a large muffler 38. Furthermore, one end of a heat exchanger 39 is connected to this large muffler 38. These tail pipe 37, large muffler 38, and heat exchanger 39 are arranged in the hot water storage tank 22 together with the combustion chamber 23. Further, the other end of the heat exchanger 39 is connected to an exhaust muffler 4o disposed outside the hot water storage tank 22. Then, the combustion gas in the combustion chamber 23 was sequentially introduced into the tail pipe 37, the big muffler 38, and the heat exchanger 39, and heated the water in the hot water storage tank 22 by heat exchange with the water stored in the hot water storage tank 22. Afterwards, it is exhausted to the outside via an exhaust muffler 4σ. Note that 41 is a hot water supply port provided on the peripheral wall of the hot water storage tank 22, and a water supply receptacle 42 is provided on the upper part of the hot water storage tank 22.

Therefore, in the above configuration, the combustion chamber 23 of the pulse combustion device 21, the tail pipe 37, the deca muffler 38, and the heat exchanger 39 are respectively arranged inside the hot water storage tank 22, and the external mixture of the hot water storage tank 22 and Since the chamber 24 is arranged in a removable manner, the spark plug 3o and the flame rod 31 are respectively provided in the mixing chamber 24, so that insulation deterioration of the spark plug 30 and the flame rod 31 is reduced compared to the conventional one. In addition, the mixing chamber 24, the spark plug 3o, and the frame rod 31 can be easily attached and detached, and maintenance and inspection operations can be facilitated. Furthermore, as in the past, the spark plug 3
Since there is no risk that o will come into direct contact with the water in the hot water storage tank 22 and be cooled, there is no risk that the operation of the spark plug 30 will become unstable when the pulse combustion device 2I is started, and the operation of the spark plug 30 can be ensured. can be increased. Further, the spark plug 30 is moved from a first limit position a, which is the intersection position of the air flow jetted from the air supply pipe 28 and the fuel gas flow jetted from the fuel supply pipe 29, with respect to the circumferential direction of the mixing chamber 24. within the range up to the second limit position Hb, which is the fuel gas ejection position from the fuel supply pipe 29, and within the center line O of the mixing chamber 24.
Fuel gas ejection position ib from the fuel supply pipe 29 with respect to the direction
It is arranged at an appropriate position @e within the mounting range on the downstream side of the distance M or more between the connecting position d of the combustion chamber 23 and the combustion chamber 23 . In this case, the air supply pipes 28 are connected along the circumferential direction of the mixing chamber 24, and the air introduced into the mixing chamber 24 from the air supply pipes 28 flows as shown by the solid line arrow in FIG. It swirls along the inner wall surface of the mixing chamber 24, and a vortex flow in the clockwise direction in FIG. 5 is formed within the mixing chamber 24. Furthermore, the fuel supply pipe 29 is connected in the substantially circumferential direction of the mixing chamber 24 in a state opposite to the swirling direction of the vortex formed by the air introduced into the mixing chamber 24 from the air supply pipe 28, and is connected to the mixing chamber 24 in a substantially circumferential direction. The fuel gas introduced into the mixing chamber 24 from the pipe 29 turns counterclockwise in FIG. 5 along the inner wall surface of the mixing chamber 24, but is introduced into the mixing chamber 24 from the air supply pipe 28. Since the inflow amount of air is larger than the inflow amount of fuel gas introduced into the mixing chamber 24 from the fuel supply pipe 29, the mixture of air and fuel gas causes the mixing chamber 24 to flow into the mixing chamber 24 as shown in FIG. An offset position f slightly offset by a distance m from the center line 0 position to the side where the fuel gas is ejected from the fuel supply pipe 29
A vortex is formed that rotates clockwise around the center. It has also been found that this vortex of the air-fuel mixture is formed downstream (on the combustion chamber 23 side) of the air and fuel injection positions.

In addition, FIG. 6 shows the ignition rate (%) at each ignition position in the circumferential direction of the mixing chamber 24 (g is the air injection position);
FIG. 7 shows the results of an experiment in which the ignition rate (%) at each ignition position in the 0 direction of the center line of the mixing chamber 24 was investigated. Therefore, as is clear from these FIGS. 6 and 7, by arranging the mounting position of the ignition plug 30 at an appropriate position e within the above-mentioned mounting range, the mixing chamber at the time of starting the pulse combustion device 21 is The air-fuel mixture in 24 can be reliably ignited, and starting performance can be improved.

Furthermore, since the mixing chamber 24 is disposed outside the hot water storage tank 22, manufacturing is easier than when the mixing chamber 24 is disposed inside the hot water storage tank 22, which is advantageous in reducing costs. be.

It should be noted that the present 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 the present invention.

〔Effect of the invention〕

According to this invention, a combustion chamber of a pulse combustion device is disposed inside a container containing a fluid to be heated, and a mixing chamber connected to the combustion chamber is disposed outside the container,
Since the mixing chamber is provided with an ignition device for ignition at startup, the ignition performance of the ignition device at startup can be improved.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of the pulse combustion device, Figures 2 to 7
The figures show one embodiment of the present invention, in which Fig. 2 is a schematic diagram of a hot water storage type water heater, Fig. 3 is a cross-sectional view of a mixing chamber, and Fig. 4 is a cross-sectional view of a mixing chamber.
The figure is a side view, Figure 5 is a cross-sectional view showing the state of vortex flow inside the mixing chamber, Figure 6 is a relationship diagram showing the ignition rate at each position around the mixing chamber, and Figure 7 is in the direction of the center line of the mixing chamber. FIG. 3 is a relational diagram showing ignition rates at each position. 21... Pulse combustion device, 22... Hot water storage tank (container), 23... Combustion chamber, 24... Mixing chamber, 28...
- Air supply pipe, 29... Fuel supply pipe, 30... Spark plug (ignition device). Applicant's representative Patent attorney Takehiko Suzue Figure 3 Figure 6 Figure 7

Claims (2)

[Claims] (1) A combustion chamber of the pulse combustion device is disposed inside a container that accommodates the fluid to be heated, and a cylindrical mixing chamber is disposed upstream of this combustion chamber. An air supply pipe and a fuel supply pipe are respectively connected to the mixing chamber, and air and fuel are intermittently introduced into the mixing chamber and mixed through these air supply pipes and fuel supply pipes, respectively,
In a pulse combustion type heating device in which a fluid to be heated in the container is heated by intermittently explosive combustion in the combustion chamber and heat exchange with the combustion gas, the mixing chamber is disposed outside the container. , a pulse combustion type heating family, characterized in that the mixing chamber is provided with an ignition device for ignition at the time of starting. (2) The ignition device generates an air flow that is ejected from the air supply pipe and forms a vortex along the inner wall surface of the mixing chamber in the circumferential direction of the mixing chamber, and the swirling direction of this vortex. A range from a first limit position corresponding to the intersection position with the fuel gas flow ejected in the direction opposite to the fuel gas flow to a second limit position which is the fuel gas ejection position from the fuel supply pipe. and within a mounting range downstream of a distance W or more between the fuel gas injection position from the fuel supply pipe and the connection position with the combustion chamber with respect to the centerline direction of the mixing chamber. A pulse combustion type heating device according to claim (1), characterized in that the mixing chamber is removably installed in the container (vH). A pulse combustion type heating device according to claim 11 or claim 2.