JPS59122817A - Combustion device - Google Patents

Abstract

PURPOSE:To enable the flame to be detected even at a non-conductive combustion plate by a method wherein a flame hole communicating with a combustion gas passage is formed at a part of conductive stopper plate for use in pushing down a circumference of the combustion plate so as to form a pilot flame. CONSTITUTION:Mixture gas is flowed through a recessed passage 9C at a flange part 9B, then passed through a flame hole 24 in a conductive annular stopper plate 23 placed at the outlet part of the passage so as to form a pilot flame 26. A conductive sensor rod 25 is arranged in such a way as it may be contacted with the pilot flame 26. With this condition, when a voltage is applied between the center rod 25 and an evaporating cylinder 6, a flame current is flowed through the flame hole 24 in the stopper plate 23 and the pilot flame 26 so as to enable a checking if a normal combustion is performed or not. Thereby, even at the non-conductive combustion plate, the flame can be detected by the conventional type of flame current sensor device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to combustion devices, and more particularly to a flame current detection device in a combustor using a non-conductive combustion plate.

Mix fuel and combustion air to create a mixed gas.

In the type of combustion device that burns this mixed gas, a flame port is generally formed between the combustion plate and the carburetor cylinder, or on the combustion plate itself, and the mixed gas is ejected from this flame port and combusted. It is true. However, in a combustion device such as a fire engine, a large amount of HOX is generated due to the high flame temperature.If the combustion device is an open type, the NOx will be released into the room, which is not good for health. If it is a closed type, the NOx will be released outdoors and cause pollution.

For this purpose, the combustion plate is made of a sintered body without any ventilation holes, and is generally called a flat plate-shaped Reyubank plate, which has many small linear flame ports from the surface on the side of the mixing chamber to the outer surface. By increasing the contact area between the flame and the Schwunk plate and lowering the flame temperature, the
It is also well known that the

However, even with a schbank plate, there is a limit to how many small flame ports can be formed, so it is difficult to achieve lower NOx compared to those formed between the combustion plate and the vaporization tube. No, it wasn't enough.

Therefore, the inventors proposed a combustion plate made of a porous sintered body to reduce NOx.

However, depending on the sintered material, this new combustion plate often becomes a non-conductive sintered plate, and in such cases, the conventional flame current detection device (conductive A device that connects a combustion plate to a grounded vaporization cylinder, uses the flame generated from the flame hole of this combustion plate to connect the sensor rod and the vaporization cylinder, and detects the combustion state using flame current) cannot be used. There were drawbacks.

This invention was made to solve the above-mentioned drawbacks, and when the combustion plate is non-conductive, a combustion gas passage is formed in a part of the periphery of the combustion plate.

A flame hole that communicates with the combustion gas passage is provided in a part of the conductive stop plate that presses the surrounding area of the combustion plate, and the combustion gas is guided from the passage to the flame hole to form a pilot flame. It is an object of the present invention to provide a flame current detection device in which the pilot frame is made to resemble a sensor rod, and the stopper and the sensor rod are electrically connected through the pilot frame.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In addition, this embodiment describes an embodiment in which a combustion device according to the present invention is incorporated into a hot air heater.

That is, in FIGS. 4 and 5, (11 is a box body with a hot air outlet (1A) on the upper front side and an intake hole (1B) on the upper back side, (2) is a box body (11 with an air intake hole). (IB) Department-
The blower installed in the box sucks indoor air through the intake hole (1B) and blows the warm air through the upper part of the box (1) to the hot air outlet (IA).
It blows air to the side. 131 is a combustion device (to be described later)
The combustion plate C9) of the combustor (5) in Al, in other words, the shift is the transparent heat-resistant glass provided in the front part of the box body (11) facing the flame, (A) is the box body (built-in below the The detailed structure of the combustion device will be described later with reference to Figures 1, 2, and 3. It is a hollow cylindrical reflector with a notch in the part facing the i4 thermal glass (31).

A window portion (4A) is formed in this portion.

Figures 1, 2, and 3 show the detailed structure of the above-mentioned combustion device, and in Figure 1, 151 is a combustor, (6) is a conductive cylindrical vaporization cylinder forming a mixing chamber (6A), Electrical connection is established by contacting with an annular stopper plate (c) to be described later.

(71 is a preheating heater embedded in the wall of this vaporization cylinder (6).

(8) is a diaphragm plate installed at the upper opening of the vaporizer cylinder (6).

It has an aperture hole (8A) in the center. (Ql is the mixing chamber (6A
), that is, the upper opening of the carburetor (6), is a substantially hollow conical non-conductive combustion plate that is arranged at the upper opening of the carburetor (6), the heater (71), and the aperture plate (8). ) constitutes a combustor (5).

Furthermore, this combustion plate +91 is made of a non-conductive porous sintered body, which is made by hardening a sponge made by sintering silicon oxide particles or particles containing 69- or less aluminum oxide with a binder. Unlike conventional combustion plates, there is no linear flame port from the mixing chamber side surface to the outer surface, but there is one in the sintered body itself.

A labyrinth of extremely small ventilation holes that run intricately from the mixing chamber side surface to the outside surface are used as flame ports.

Furthermore, this combustion plate (91) has an annular 7 flange portion (9B) around the opening (9A) side as shown in detail in FIGS. 2 and 3.
) is provided integrally, and the 7 rank part (9B) with
is provided with a partially cut-out combustion gas passage (9C) d, and a conductive annular stop plate 123 having a cross-sectional shape.
By pressing the flange portion (9B) toward the vaporization tube (6) at step 1, the vaporization tube (6) is airtightly attached to the upper opening of the vaporization tube (6). In addition, the annular stop plate G has a flange part (9B).
A round hole or slit flame hole is provided at the exit of the passageway (9C), and a sensor rod made of conductive metal strip is placed above the flame hole. ) is located.

In addition, Oe is a vaporizer cylinder (6A) with one end facing into the mixing chamber (6A).
) Nozzle connected to the wall, α11 is the air y connected to this nozzle 6Q, 0% is the wind 1 Taibushi valve installed in the middle of this air pipe i11, (13 is the combustion air connected to the air gap The blower (inserted is a needle coaxially provided in the nozzle QfI, one end faces into the mixing chamber (6A) through the feed opening of the combustor (5) of the nozzle 01, and the other end faces into the mixing chamber (6A) through the feed opening of the combustor (5) of the nozzle 01, and the other end is connected to the Oriais tube Oe described later. Connected to one end (151
is an oil level regulator that stores a predetermined amount of liquid fuel to be supplied to the combustor (5), and an oil reservoir is formed inside by a partition (1sA). Q? + is a static pressure return pipe, one end of which extends upward within the oil level regulator 09, and the other end connected to the air pipe anK. The cod is an oil pipe, and one end is connected to the bottom of the oil reservoir of the oil level regulator a9, and the other end is connected to the bottom of the sub-tank t19. (To) is an electromagnetic pump for oil feeding installed in the middle of the oil feeding pipe side, 12n+'z oil level regulator aS on the bottom of the part other than the oil sump part, and the other end is connected to the oil feeding control.
4-tube, @ is a cartridge tank that holds liquid fuel,
It is placed on top of Subtank A.

The combustion device is configured as described above.

Next, to explain the operation of this device, first, turn on the power switch (
The ONtCL (not shown) is used to energize the heater (71) to preheat the wall of the vaporization cylinder (6) to a temperature required for vaporization of the liquid fuel. When preheating is completed, the blower o3 is driven.

Air pipe a1), and a constant oil level device aS through the static pressure return pipe surface
Blow air inside. The combustion air blown into the air pipe I is ejected into the mixing chamber (6A) through the nozzle frame.

On the other hand, the magnetic pump handle is also driven, and the sub tank is 0 from the tank device.
The liquid fuel stored in 9 is supplied to the oil sump in the oil level regulator aS through the oil feed pipe. The liquid fuel supplied to the oil sump S to the leveling device overflows when it exceeds the height of the partition (1sA).

The oil returns to the oil supply pipe - through the overflow pipe r21), is pumped up again by the electromagnetic pump (2), and the fuel consumed by combustion, which will be described later, is supplied from the tank c12 to keep the oil level constant.

At this time, air is blown into the oil level regulator aS through the static pressure return pipe surface, so this air applies pressure (P) to the oil level, presses the oil level, and supplies liquid fuel to the needle U through the Orice pipe aQ. do. Since the combustion air is ejected from the nozzle head, the liquid fuel supplied to the needle Oa is atomized by the shear force of this airflow, mixes with the combustion air, and spreads out into a conical shape until it reaches the vaporization tube (6). It collides with the inner wall and is vaporized.

The heated and vaporized liquid fuel gathers in the throttle hole (8A) of the throttle plate (8) while mixing with the surrounding combustion air, and the mixture concentration is made uniform, and this mixed gas is...

The air is ejected from the throttle hole (8A) of the throttle plate (81), reaches the outer surface of the combustion plate (9) through the labyrinth-like extremely small ventilation holes of the combustion plate, and is ignited by a predetermined ignition means.
) starts red-hot combustion so as to envelop this entire surface.

9 In the present invention, part of the mixed gas is converted into a 7 rank part (9B
) is passed through the notch-shaped passage (9), and then passed through the flame hole of the conductive annular stop plate @ at the outlet thereof, forming a pilot flame there.
Place the conductive sensor rod (to) so that it hits this pilot frame (a).

In this state, when a voltage is applied between the sensor rod (to) and the vaporizer tube (6), flame current flows through the flame hole part of the stop plate (to) and the pimit frame (a), causing normal combustion. It is possible to detect whether or not this is being done.

The device according to Jin's invention operates as described above.

As shown in FIGS. 4 and 5, the heat generated by this combustion is blown out from the warm air outlet (IA) by the air sent by the blower till, and is also blown out from the combustor (511).
It is reflected by the surrounding reflector (4) and the window of the reflector (4) (
4A) and transparent glass (31).

Heat the room. In the above embodiment, in order to significantly increase the contact area between the flame and the combustion plate (9),
In addition, for the purpose of increasing the combustion area within a limited space, a combustion plate (91 is shaped like a container, but it goes without saying that it may be shaped like a flat plate, etc.). Although it is electrically connected by bringing the and vaporizing cylinder (6) into contact, it is not necessarily necessary to electrically connect the two, and the lead wire is drawn out from the stop plate (c).

The combustion state may be detected by applying a voltage between the stop plate and the sensor rod. Further, the fuel may be gas fuel instead of liquid fuel.

As described above, according to the present invention, the non-conductive combustion plate is
A device provided at the opening of a conductive vaporization cylinder that forms a mixing chamber for mixing fuel and combustion air, in which an amount of combustion gas that can form a pilot frame is passed through a part of the periphery of the combustion plate. The periphery of the combustion plate is suppressed and fixed to the vaporization cylinder by a conductive stop plate having a pilot flame forming flame port communicating with this passage, and corresponding to the flame port of the stop plate. A flame current sensor rod is installed at a predetermined distance from the flame port, and a voltage is applied between the sensor rod and the six stopper plate to detect the combustion state. Even if it is non-conductive, the combustion state can be detected reliably as in the case of a conductive combustion plate.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an apparatus according to an embodiment of the present invention, and FIG.
The figures are an enlarged sectional view of the combustor shown in Fig. 1, Fig. 3 is an exploded external perspective view of the combustion plate, annular stop plate, and sensor rod, and Fig. 4 is a heating system incorporating a device according to an embodiment of the present invention. FIG. 5 is a front view showing the wind heater, and FIG. 5 is a sectional view taken along the line V-V in FIG. 4. In the figures, the same symbols indicate the same parts, (5+ is the combustor, (6) is the carburetor, (6A) is the mixing chamber, (9) is the combustion plate. (9A) is the opening, (9B) is 7 lunge section, (
9G) is the 7 flange passage, 12a is the flame opening of the annular holding plate, @ is the pilot frame, and @ is the sensor rod. Agent Shin Kuzuno - Figure 4 Figure 5

Claims (1)

[Claims] (11) A non-conductive combustion plate provided at the opening of a carburetor forming a mixing chamber for mixing fuel and combustion air, a part of the periphery of the combustion plate A passage is formed through which combustion gas can pass in an amount sufficient to form a pilot frame, and the area around the combustion plate is pressed against the vaporizing cylinder by a conductive stop plate that communicates with this passage and has a pilot frame forming hole. A flame current sensor rod is placed at a portion of the stop plate corresponding to the flame port with a predetermined gap between the flame port and the flame current sensor rod, and a voltage is applied between the sensor rod and the stop plate to cause combustion. A combustion device characterized by detecting the state. (2) A patent characterized in that the combustion plate is made of a porous sintered body and burns the combustion gas ejected from the pores on the surface. The combustion device according to claim 1. (3) Claim 1, characterized in that the vaporization cylinder is made of an electrically conductive material, and the stop plate is electrically connected to the vaporization cylinder. or the combustion device described in paragraph 2. (4) The combustion plate is in the shape of a container with an opening on the side of the mixing chamber, and has a flange portion extending outward around the opening, and has a 7-rank portion with a flange portion. The combustion device according to any one of claims 1 to 3, characterized in that a part thereof has a passage through which a quantity of combustion gas that can form a pilot frame is passed. 5. The combustion device according to claim 4, wherein the combustion plate has a conical shape.