JPH0252908A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To stabilize the combustion state even if the combustion rate is changed, by returning a portion of oil, sent from a fuel pump, to the inlet of the fuel pump through a return port of a bypass nozzle and a return path, and providing a solenoid valve and an orifice on the return path. CONSTITUTION:Oil passes through a supply pipe 8 and an oil leveler 9, is sent by a pump 2 through a nozzle holder 3 to a bypass nozzle 1, and atomized from the tip of the bypass nozzle. Oil atomized is ignited by an ignitor, mixed with air sent by a fan 10, and burned in front of a burner head 12. A portion of oil from the bypass nozzle 1 passes through a return port of the bypass nozzle 1 and a return path 5 and, then is returned to the inlet side of the pump 2 through the oil leveler 9. The amount of oil to be returned through the return path 5 is controlled to an adequate amount by an orifice 7, and the spray rate is changed by on-of action of a solenoid valve 6, so that the combustion rate is changeable, causing the combustion performance to be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid fuel combustion device used as a heat source for oil hot water boilers and the like.

BACKGROUND OF THE INVENTION In recent years, liquid fuel combustion devices that vary the amount of combustion have been increasingly used.

Hereinafter, a conventional liquid fuel combustion device will be described with reference to the drawings.

In Figure 2, 21.21' is a nozzle, 22 is a pump that supplies liquid under pressure to the nozzle 21, 23.23' is a nozzle holder that fixes the nozzle, and 24.24' is a feeder that connects the nozzle holder and the fuel pump. Flow path, 25 is feed flow path 2
4' is a solenoid valve, 26 is an oil strainer, and 2 is an oil strainer.
7.27' is a burner head corresponding to the nozzle, 28 is a fan, and 29 is a motor that drives the fan.

The operation of the liquid fuel combustion apparatus configured as described above will be described below.

Oil supplied from an oil tank (not shown) passes through an oil strainer 26 and is sent to a feed channel 2 by a pump 22.
4.24', is sent from the nozzle holder 23.23' to the nozzle 21.21', is sprayed from the tip of the nozzle 21.21', is ignited by an igniter such as a high-pressure plug (not shown), and is ignited by the fan 28. The mixture is mixed with the air sent by and burned in front of the burner head 27.

By opening and closing a solenoid valve 25 provided in the feed channel 24', the amount of oil sprayed can be varied and the amount of combustion can be varied.

Problem to be Solved by the Invention However, in the above configuration, a plurality of nozzles 21, 21
' are provided with burner heads 27 and 27', respectively.
Not only the structure of the burner becomes complicated, but also the structure of the part for attaching the burner to the heat exchanger (not shown). Further, the pressure of the pump 22 is different depending on whether one nozzle is used or two nozzles are used, and the combustion performance changes. Additionally, there is a problem that combustion performance changes when one burner head is burning and when two burner heads are burning due to the influence of each other's flames and the influence of air blown out from the burner head that is not burning. there were.

The present invention solves the above problems and provides a liquid fuel combustion device that can maintain a stable combustion state even if the combustion amount is changed.

Means for Solving the Problems In order to solve the above problems, the liquid fuel combustion device of the present invention includes a bypass nozzle, a pump that supplies fuel oil under pressure to the bypass nozzle, a return port of the bypass nozzle, and an inlet of the pump. It is equipped with a return flow path connecting the two sides, and this return flow path is provided with a solenoid valve and an orifice.

Effect With the above configuration, a part of the oil sent from the fuel pump passes through the return port of the bypass nozzle and returns to the inlet side of the fuel pump through the return flow path, but there is a solenoid valve and an orifice in the return flow path. Therefore, by opening and closing the solenoid valve, the amount of spray from the bypass nozzle is varied and the amount of combustion changes.

EXAMPLE Hereinafter, a liquid fuel combustion apparatus showing an example of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a bypass nozzle, 2 is a pump that supplies liquid oil under pressure to the bypass nozzle, 3 is a nozzle holder that fixes the bypass nozzle, 4 is a feed channel connecting the nozzle holder 3 and the pump 2, and 5 is a return flow path that connects the return port of the bypass nozzle 1 and the inlet side of the pump 2 via the oil leveler 9, 6 is a solenoid valve provided in the return flow path 5, and 7 is the same (a solenoid valve provided in the return flow path 5). It is an orifice located closer to the pump 2 than the solenoid valve 6. 8 is an oil supply path connecting an oil tank (not shown) and the fuel pump, 9 is an oil leveler installed in the oil supply path, and 10 is a fan. , 11 is a motor 12 that drives the fan 10, and is a burner head.

The operation of the liquid fuel combustion device having the above configuration will be explained. Oil in an oil tank (not shown) passes through a supply path 8 and an oil leveler 9, is sent from a nozzle holder 3 to a bypass nozzle 1 by a pump 2, and is sprayed from the tip of the bypass nozzle. The sprayed oil is ignited by an igniter such as a high-pressure plug (not shown), mixes with air sent by the fan 10, and burns in front of the burner head 12. A portion of the oil from the bypass nozzle 1 passes through the return port of the bypass nozzle 1, passes through the return passage 5, and is returned from the oil leveler 9 to the inlet side of the fuel pump 2. The oil leveler 9 is for preventing air from entering the pump 2 by releasing the air sucked in from the tip of the bypass nozzle 1 through the return flow path 5 into the atmosphere. Instead of the oil leveler 9, an automatic air venting device may be provided in the middle of the return channel 5 to release air. The return flow rate passing through the return passage 5 is controlled to an appropriate amount by the orifice 7, and the amount of spray can be varied by opening and closing the solenoid valve 6, and the amount of combustion can be varied.

As described above, according to this embodiment, by providing a solenoid valve and an orifice in the return flow path connecting the return port of the bypass nozzle and the inlet side of the pump, the spray amount can be varied even in one nozzle by opening and closing the solenoid valve. The amount of combustion can be varied. Therefore, compared to the conventional example in which there are two nozzles and two burner heads, combustion performance is stabilized.

Effects of the Invention As is clear from the above description of the embodiments, the liquid fuel combustion device of the present invention has an electromagnetic return flow path connecting the return port of the bypass nozzle and the inlet side of the pump that supplies fuel oil under pressure to the bypass nozzle. By providing a valve and an orifice, the combustion amount can be varied with one nozzle and burner head, and they do not affect each other compared to the conventional case where there are two nozzles and two burner heads. Therefore, combustion performance is stabilized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a liquid fuel combustion apparatus showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional liquid fuel combustion apparatus. 1...Bypass nozzle, 2...Pump, 5...Return passage, 6...Solenoid valve, 7
...orifice. Name of agent: Patent attorney Shigetaka Awano and 1 other person! −
-Bypass No.9 Quiz

Claims (1)

[Claims] A bypass nozzle, a pump that supplies fuel oil under pressure to the bypass nozzle, and a return flow path connecting a return port of the bypass nozzle to an inlet side of the pump, and a solenoid valve and an orifice are provided in the return flow path. liquid fuel combustion equipment.