JPS62233612A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To provide an excellent combustion state during switching between high and low combustion, by a method wherein a ratio of an amount of primary air to an amount of secondary air is kept approximately at the same value even when the combustion state is varied. CONSTITUTION:Although, during high combustion, an electromagnetic solenoid 10 is demagnetized and a large opening 8 is released, during low combustion, which the solenoid 10 excited, the large opening 8 is closed by means of a variable damper 9, and air flowing in an intake chamber 3 through a small opening 7 is guided to a primary air duct 4 and secondary air duct 5. Thus, since the secondary air not flows through the large opening 8, an amount of the secondary air guided to both the two ducts 4 and 5 is decreased, and an amount of the secondary air is prohibited against too increase. This constitution stabilizes combustion, and prevents a burner body from being excessively cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to liquid fuel combustion devices such as oil fan heaters.

(B) Conventional technology As disclosed in Japanese Patent Application Laid-open No. 138312/1983, this type of conventional combustion apparatus supplies primary air sent from an air supply fan to the vaporization chamber in the burner body through a dedicated duct. At the same time, fuel is ejected from a nozzle via an oil feed pipe by a pump, vaporized in the vaporization chamber, and the mixture is ejected from a flame port at the top of the burner to ignite and burn. Further, the secondary air is supplied by the fan to the combustion flame at the flame opening through the secondary air-dedicated duct. In the case where the combustion state can be switched between strong and weak combustion states, a damper for switching between strong and weak combustion states is provided in the secondary air duct to adjust the amount of combustion air, especially the amount of secondary air supplied.

However, in such a combustion device, the ratio between the amount of secondary air and the amount of secondary air differs between strong combustion and weak combustion. However, there was a drawback that the amount of secondary air was too large and the burner body was cooled too much, resulting in insufficient vaporization and inability to achieve proper combustion.

(c) Problems to be Solved by the Invention In view of the problems of the prior art mentioned above, the present invention attempts to perform combustion favorably by maintaining a balance between the amounts of primary and secondary air for strong and weak combustion. The purpose is to

(d) Means for Solving the Problems For this purpose, the present invention provides an air supply path through which outside air sucked in by an air supply fan passes, a primary air duct for supplying combustion air to the combustion burner, and a primary air duct for supplying combustion air to the combustion burner. A secondary air duct, a combustion air intake chamber that communicates with the air supply passage through a plurality of openings and also communicates with any of the ducts, and a combustion air intake chamber that mainly leads to the primary air duct among the openings. and a variable air amount damper that opens and closes the opening according to the combustion state.

(*) When the action is in a strong combustion state, the electromagnetic solenoid (10) is demagnetized and the large opening (8) is opened, but when the state is in a weak combustion state, the solenoid (10) is energized,
The large opening (8) is closed by the variable damper (9). Therefore, the air flowing into the intake chamber (3) through the booth opening (7) is guided to the primary air duct (4) and the secondary air duct (5), but the large opening (8)
), both ducts (4) and (5)
Since the amount introduced together is reduced, the amount of secondary air is not too large, and combustion is stabilized and the burner body (15) is not cooled too much.

(f) Example An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) is an air supply path through which outside air sucked in through a filter (not shown) by an air supply fan (2) disposed midway through, and the inflow side of the air supply path (1) is A combustion air intake chamber (3) is formed in the upper part on the opposite side. The intake chamber (3) communicates with the primary air duct (4) and the secondary air duct (5), and the intake chamber (3)
) communicates with the air supply path (1) via the backflow prevention tube (6), the small opening (7), and the large opening for switching between strong and weak combustion (8>. That is, these prevention tubes (6) , the small opening (7) and the large opening (8) communicate with both of the ducts (4) and (5). (9) is a variable air volume damper, and the upper surface of the intake chamber (3) It is moved by a push-out electromagnetic solenoid (10) fixed to a combustion burner (11), which will be described later.
When strong combustion occurs, the large opening (8) is opened in a demagnetized state, and when weak combustion occurs, the large opening (8) is energized and closed. And this small opening (
7) and the large opening (8) also communicate with the secondary air duct (5), but mainly communicate with the primary air duct (4) to supply air.

The backflow prevention cylinder (6>) is erected above the air supply path (1), and its upper end faces the duct (5).

(11) is a combustion burner, and the flame rod (13
) and a burner case (1) in which the spark plug (14) is arranged.
2), and a burner body (15>) having a circumferential wall disposed inside the case (12>) with a space therebetween.

A vaporization heater (16) is installed on the peripheral side wall of the burner body (15).
) is buried, and the internal vaporization chamber (17) is connected to the heater (16
) is heated by In addition, the aforementioned secondary air duct (5
) communicates with the lower part of the burner case (12), and the L-shaped primary air duct (4) communicates with the lower part of the burner case (12).
) and is further fitted and held on the side of the burner body (15).

Then, kerosene is pumped up from the oil storage tank (19) by an electromagnetic pump (18), passes through the duct (4), and is injected from the tip of the nozzle (21) into the burner body (13). be done.

(22) is a throttle plate, and a hanging tube (24) forms a throttle passage (23) through which the premixed vaporized gas in the vaporization chamber (17) flows out.
) are integrally formed. (25) is the burner body (13
) and the burner head provided on the top of the diaphragm plate (22), and flame ports (26) are formed at multiple locations.
facing the flame rod (13) and the spark plug (
14) is provided.

Next, one operation based on the above configuration will be explained below. First, when the power is turned on, the vaporizing heater (16) is energized to heat the burner body (15), and when it reaches a temperature that allows vaporization, the air supply fan (2), electromagnetic pump (18), and ignition are turned on. The plug (14) and the hot air Suita fan (not shown) are energized.Then, the operation of the air supply fan (2) causes the outside air to flow through the air supply path (1) and the combustion air through the filter (not shown). Introduced into the intake room (3) and further connected to the primary air duct (
4) into the vaporization chamber (17). At this time, the electromagnetic pump (18) moves the oil storage tank (19)
The kerosene inside is pumped up and jetted into the vaporization chamber (17) from the tip of the nozzle (21) through the oil supply pipe (20). Therefore, the kerosene is immediately vaporized, becomes vaporized gas, and the combustion air and mixture are ejected from the flame port (26) of the burner head (25) through the throttle passage (23), and the kerosene is ejected from the flame port (26) of the burner head (25).
), it becomes significantly larger and burns.

To explain the combustion air in detail here, first of all, in the strong twist firing state, the variable air amount damper (9) is operated by an electromagnetic solenoid (
10) is demagnetized, the large aperture (8) is open. For this reason, the air from the air supply fan (2) is branched into primary air and secondary air via the backflow prevention cylinder (6) and the small frontage (7) and large opening (8). That is, the primary air enters the air intake chamber (3) and flows to the primary air duct (4) and the secondary air duct (5), while the secondary air passes through the backflow prevention tube (6) and flows into the secondary air duct (4) and the secondary air duct (5). The fuel flows into the secondary combustion duct (5) and is subjected to secondary combustion.

Therefore, in the highly twisted firing state, the amount of secondary air is large, resulting in proper combustion. Further, in a weak combustion state, the solenoid (10) is energized and the large opening (8) is closed by the variable damper (9). Therefore, the air flowing into the intake chamber (3) through the booth opening (7) will be guided to the primary air duct (4) and the secondary air duct (5). ), the amount introduced into both ducts (4) and (5) is reduced, so the amount of secondary air is not too large, and combustion is stabilized and the burner body (15) is The backflow prevention cylinder (6) is connected to the secondary air duct (6) at its upper end so that the air that has flowed to the secondary air duct (5) does not flow to the primary air duct (4). (5) and the duct (5) have a double pipe structure. Also, the small opening (7
) can be provided in the variable damper (9) to obtain the same effect.

(G) Effects of the Invention As described above, the present invention allows the ratio of the amount of secondary air to the amount of secondary air to be changed from strong twist firing to weak combustion or vice versa even if the combustion state changes. In this case, the combustion is carried out in a good manner, and the combustion burner body is not cooled too much more than necessary, and vaporization is carried out satisfactorily. In other words, in the conventional type, when changing from strong twist firing to weak combustion, the amount of secondary air decreased but the amount of secondary air did not change, so the amount of secondary air was too large and the burner body However, the present invention can solve these problems.

[Brief explanation of drawings]

The figure is a longitudinal sectional view of a combustion device showing one embodiment of the present invention. (1)...Air supply path, (2)...Air supply fan,
(3)... Air intake chamber, (4)... Primary air duct, (5)... Secondary air duct, (6)...
・Backflow prevention tube, (7)...small opening, (8)...
Large opening, (9)...Variable air volume damper.

Claims (1)

[Claims] (1) An air supply path through which outside air drawn in by an air supply fan passes, a primary air duct and a secondary air duct for supplying combustion air to the combustion burner, and the air supply path and a plurality of openings. a combustion air intake chamber that communicates with each of the ducts through the duct, and a variable air amount damper that opens and closes an opening mainly for leading to the primary air duct among the openings according to the combustion state. Liquid fuel combustion equipment with.