JPS58182021A - Burner for liquid fuel - Google Patents

Abstract

PURPOSE:To provide a flame detecting ability which is stable against a wide variation in a combustion quantity region and a scatter of an air-fuel ratio, by a method wherein a projection protruding toward a wire netting is formed on a part of a flow-uniforming cylinder, and a detecting electrode rod for a flame detector is located in the vicinity of the projection. CONSTITUTION:A projection 18 projecting outward is formed on a part of a flow-uniforming cylinder 8, and is firmly adhered to a wire netting 10. A detecting electrode rod 17 for a flame detector 16 is situated in the vicinity of the projection. An air-fuel premixture generated in a gasifying chamber 1 is exhausted to the outside of the wire netting 10 through a premixing chamber 12 and is fired by an igniter. Meanwhile, pores in the flow-uniforming cylinder 8, forming a flame-forming surface, takes the form of a pore-combustion, whereby a long flame being a secondary flame may be formed by a blue fire, and the detecting electrode rod 17 located in the vicinity of said flame is sufficiently heated by contact. This enables to perform a stable detection of a flame and permits the formation of a steady blue flame even if an irregularity of an air- fuel ratio occurs and a combustion quantity varies.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device that vaporizes liquid fuel and sends it together with primary air as a premixed gas to a wire gauze section for surface combustion.

As shown in FIG. 1, this conventional combustion apparatus has a length of 11 parts and a length of 1 part. That is, the heater 2 is embedded in a portion of the bottomed cylindrical vaporizing chamber 1.

At the seventh end of the vaporization chamber 1, a cylindrical cylinder 8 with a larger diameter end is attached, and the second end of the rectifying cylinder 8 has the same diameter as the first end, and a closing cap is installed inside. Further, a cylindrical wire mesh 10 is attached to the large diameter part of the 4-door, and a rectifying space 11 is provided between it and the small diameter part. In addition, the rectifier tube 8
A premixing chamber 12 is formed inside.

A fixed flange 13 with a sealed structure is provided at one end of the vaporization chamber 1, and an outer cylinder 15 is arranged around the outer periphery of the rectifying cylinder 8 and the wire mesh 10 with a combustion space 14 interposed therebetween. A flame detector 16 is provided at the 1' portion of the constant flange 13, and the flame detector 16 is disposed close to the pole rod 17 and the wire mesh 10.

In this case, the heater 2 of the vaporization chamber 1 is energized, and the vaporization chamber 1
After heating, combustion air is sent into the vaporizer 1 by driving the blower fan provided in the air passage 1.Next, the fuel pump is driven and the fuel tank is heated. Suction more fuel and burn it]) 1; Small tip nozzle 1
11, when the fuel is allowed to tIXll in the vaporization chamber 1, the fuel becomes vaporized residue on the warm wall surface, is mixed with the combustion air without being led to the premixing chamber 12, and is sent to the rectifier cylinder 8 as a premixture. It passes through a large number of pores, passes through the rectifying space 115f, and ejects outward from the periphery of the wire mesh 10. Therefore, the combustion space 1
When a blue flame is ignited by the igniter in step 4, a combustion flame is formed on the surface of the wire mesh 10. Here, a power circuit is constructed between the flame detection electrode 17 from the flame detector 16 installed near the combustion flame and the combustion part side, and a current is generated by the ion flow generated by the combustion flame. It detects the generation of flame and operates the fuel pump continuously to continue combustion. In this case, unlike a Bunsen flame or a blue combustion flame from a single flame hole, surface combustion is performed with the flame layer in close contact with the surface of the wire mesh 10, so slight fluctuations in the air-fuel ratio and the flame detection electrode Due to subtle variations in the positional relationship between the fuel pumps 17 and 17, the ion flow may not flow smoothly, causing malfunctions such as detecting an abnormal state and stopping the fuel pump. In addition, if the change in the combustion meter is large, no ion current is generated on the low calorie side, resulting in a combustion device with a very small calorie change range.

The present invention aims to eliminate these conventional drawbacks, and to provide a flame detection device that can vary the combustion range over a wide range and has a stable flame detection ability against disturbances in the air-fuel ratio. .

In order to achieve this object, the present invention provides a part of the rectifier tube with a protrusion protruding from the wire mesh, and a flame detection electrode of a flame detector is provided adjacent to this part. .

With this configuration, there is no rectifying space at the protrusion part - the premixture will be ejected directly from the pores of the rectifying tube, forming a blue flame of multiple pore combustion.
The blue flame comes into contact with the flame detection electrode rod provided close to this, and a sufficient ion flow is generated, so that a stable state can be obtained in the ion flow. For this reason, even if there is some disturbance in the air-fuel ratio, the blue flame will not disappear and will always heat the flame detection pole rod, generating a flow of ions. In addition, even when the combustion slip range is varied, a blue flame is always maintained, so stable combustion can be achieved.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 and 3. Note that parts that are the same as those in FIG. 1 are given the same reference numerals to simplify the explanation. 2 and 3, what is particularly different from the conventional example shown in FIG. 1 is that a part of the straightening tube 8 is provided with an outwardly protruding protrusion 18 that is brought into close contact with the wire mesh 10, and this part is exposed to the flame. The point is that the detection electrode rod 17 of the detector 16 is placed close to the sensor. A base circuit 19 is provided between the burner side and the detection electrode 1Y, and both ends of the resistor 2o are connected to the fuel pump 6 via a controller 21.

Here, the premixture generated in the vaporization chamber 1 is discharged to the outside of the wire mesh 10 through the premixing chamber 12 and ignited by the igniter. At this time, either the wire mesh 10 forms a thin flame layer due to surface combustion, or the flame hole load is extremely small, and the flame itself has an extremely short flame length. For this purpose, □ In this embodiment, some of the protrusions 18 of the rectifier tube 8 are brought into close contact with the wire mesh 10, or by removing the wire mesh 10 that is in close contact with the protrusions 18, the pores of the rectifier tube 8 are made into a flame forming surface. Since the pore combustion is carried out, a long flame with a secondary flame can be formed using blue flame, and the detection electrode rod 17 provided close to the flame can be sufficiently contacted and heated.

For this reason, the ionic current generated in the flame is sufficiently
Since the current flows through the resistor 20, a sufficient current is obtained between both terminals of the resistor 20, and the fuel pump 6 can be stably driven via the controller 21.

In addition, in FIGS. 2 and 3, 3 is a ventilation passage, 4 is a ventilation fan, 6 is a fuel capillary, and 7 is a fuel tank, which have been used in the past.

According to the liquid fuel combustion device of the present invention, as shown below,
Since the flame can be brought into sufficient contact with the flame detection electrode rod, stable flame detection can be performed. In addition, it is possible to form a stable blue flame even when the air-fuel ratio varies or the combustion amount is varied, so there is no misfire or false fire malfunction, and stable flame detection and stability 1-
The combustion amount can be varied over a wide range.

[Brief explanation of the drawing]

Section 1 is a sectional view of a main part of a conventional liquid fuel combustion device, FIG. 2 is a sectional view of a main part of a liquid fuel combustion device according to an embodiment of the present invention, and FIG. 3 is a sectional view of a main part of a conventional liquid fuel combustion device. FIG. 8 rectifying tube, 10... wire mesh, 11... rectifying space, 17-- flame detection electrode rod, 18... protrusion. Name of agent: Left side 1 Toshio Nakao and 1 other person Figure 1 Suku 107- \ \-ω Q, + Aji

Claims (3)

[Claims] (1) Attach a heat-resistant wire mesh to the outer periphery of a rectifier tube having a large number of pores, with a rectification space provided between the rectifier tube and the wire mesh, and place a part of the rectifier tube on the wire mesh side. A liquid fuel combustion device in which a flame detection sensor is placed close to the protrusion. (2) Attached to the protrusion of the rectifying cylinder. The liquid fuel combustion device according to claim 1, which eliminates the 15-minute wire mesh. (3) The liquid fuel combustion device according to claim 1, wherein the protrusion 1η≦ of the straightening tube is brought into contact with the wire mesh.