JPH0367908A - Combustion rate control metchanism for gun type burner - Google Patents

Abstract

PURPOSE:To effectively prevent oil leakage from a nozzle when fire of a burner is extinguished by connecting a by-pass line of a by-pass nozzle to an oil feed line to the by-pass nozzle to a suitable point upstream of an electromagnetic pump and downstream of an oil tank through a solenoid proportional control valve, and by further providing an oil back flow check mechanism in the by-pass line. CONSTITUTION:For example, when an oil tank 8 is located higher than a solenoid proportional control valve 5, when fire of a burner 1 is extinguished and an electromagnetic pump 7 stops, even with the valve 5, oil in the oil tank 8 flows backward into a by-pass line 4 and flows into a by-pass nozzle 3 through the control valve 5, with the result that the oil leaks from an injection port 13 of said nozzle 3. However, since a back flow check mechanism 9 is provided in the line 4 in addition to the valve 5, even in such a case of mentioned above, back flow through the by-pass line 4 can be prevented by means of the mechanism 9. Consequently, oil leakage from the injection port 13 of the nozzle 3 at the fire extinguishing of the burner 1 can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mechanism for adjusting the combustion amount of a gun-type burner that sprays and burns fuel oil such as kerosene from a bypass nozzle.

(Prior Art) An example of a combustion amount adjustment mechanism for a gun type burner using a conventional bypass nozzle is shown in FIG. 2+al.

This adjustment mechanism a is a bypass path C of the bypass nozzle b.
is returned to the oil supply line e of the bypass nozzle b via the electromagnetic opening/closing valve d, and the gun This is to adjust the combustion amount of type burner h.

In the figure, the reference numeral i is an electromagnetic pump, j is an oil strainer, k is a fan motor for feeding combustion air to the burner h, and l is a spark plug.

(Problem to be Solved by the Invention) As described above, in the conventional combustion amount adjustment mechanism a of the gun type burner h, the combustion amount of the burner h is adjusted by opening and closing the ionization on-off valve d provided in the bypass path C. Therefore, there is a problem in that the combustion amount changes roughly and in stages, making it difficult to make fine adjustments.

Therefore, instead of the electromagnetic on-off valve d, there is a method to solve the above problem by providing an electromagnetic proportional control valve m as shown in Fig. 2(b), but the electromagnetic proportional control valve m does not have a check mechanism. For example, if the oil tank f is installed at a higher position than the electromagnetic proportional control valve m, if the electromagnetic pump j stops when the burner h is extinguished, the oil in the oil tank f will flow back into the bypass line C. However, there is a problem in that it flows into the bypass nozzle b through the electromagnetic proportional control valve m, and then leaks out from the injection port g.

The present invention aims to solve such problems.

Note that in FIG. 2 (in bl, n is the valve body, 0 is the magnet, and p is the excitation coil.

(Means for Solving the Problems) The configuration of the present invention will be explained based on FIG. A bypass nozzle 3 is provided as two oil spray nozzles, and the bypass line 4 of the bypass nozzle 3 is connected to the upstream side of the electromagnetic pump 7 in the oil supply line 6 to the high speed nozzle 3 via the electromagnetic proportional control valve 5. , the oil is returned to an appropriate position on the downstream side of the oil tank 8, and an oil backflow prevention mechanism 9 is further provided in the bypass yarn path 4.

Furthermore, the mechanism 2 described in item 2 is one in which the backflow prevention mechanism 9 described in item 1 is configured with an electromagnetic on-off valve 10.

The mechanism 2 described in item 3 is configured by constructing the backflow prevention mechanism 9 described in item 1 above with a check valve 11.

(Operation and Examples) Fuel oil such as kerosene stored in the oil tank 8 is filtered by an oil strainer 12 provided in the oil supply line 6, then pressurized by the electromagnetic pump 7 and supplied to the bypass nozzle 3. A part of the fuel oil supplied to the pihas nozzle 3 is injected from the injection port 13 of the nozzle 3, and is ignited and burned by the discharge of the spark plug 14.
What is not injected from the
The oil flows into the oil supply line 6 via the electromagnetic proportional control valve 5 and the backflow prevention mechanism 9, and is again supplied to the nozzle 3 by the electromagnetic pump 7.

The electromagnetic proportional control valve 5 can linearly change the opening degree by changing the voltage applied to its excitation coil, and in the present invention, since it is provided in the bypass yarn path 4, The amount of recirculated oil from the nozzle 3, and therefore the combustion amount of the burner 1, can be adjusted steplessly over a wide range.

However, the electromagnetic proportional control valve 5 does not have a check mechanism, and this alone cannot prevent backflow in the bypass line 4. Therefore, for example, if the oil tank 8 is located higher than the electromagnetic proportional control valve 5, etc., when the electromagnetic pump 7 is stopped when the burner 1 is extinguished with only the electromagnetic proportional control valve 5, the oil in the oil tank 8 flows back into the bypass line 4, passes through the electromagnetic proportional control valve 5, and is transferred to the bypass nozzle 3. and leaks out from the injection port 13.

However, in the present invention, in addition to providing such an electromagnetic proportional control valve 5 in the bypass yarn path 4, a backflow prevention mechanism 9 is provided, so that even in the above-mentioned case, the bypass Backflow in the yarn path 4 can be prevented, and therefore oil leakage from the injection port 13 of the nozzle 3 when the burner 1 is extinguished can be prevented.

The backflow prevention mechanism 9 may be configured as appropriate as long as it can prevent backflow through the bypass yarn path 4 at least when the burner 1 is extinguished, for example, as in the embodiment of the present invention.
It may be constructed with an electromagnetic on-off valve 10 which is opened when the burner 1 is in combustion and closed when the burner 1 is extinguished, or it may be constructed with a check valve.

In the embodiment of the present invention, the backflow prevention mechanism 9 is provided on the downstream side of the electromagnetic proportional control valve 5, that is, on the oil supply line 6 side, but it is of course possible to provide it on the upstream side, that is, on the nozzle 3 side. It is.

(Effects of the Invention) As mentioned above, even if the oil tank is located higher than the electromagnetic proportional control valve, the mechanism of the present invention can effectively prevent oil leakage from the nozzle when the burner is extinguished. ,
This has the effect of easing the installation conditions not only for the oil tank but also for the entire burner, and reducing wasteful oil consumption.

[Brief explanation of drawings]

FIG. 1 is an overall system diagram corresponding to an embodiment of the present invention, and FIG.
Figures (al and bl are respectively an overall system diagram and an explanatory diagram of main parts of a conventional example. Reference numeral 1... gun type burner, 2... combustion amount adjustment mechanism, 3... bypass nozzle, 4...・Bypass route,
5... Solenoid proportional control valve, 6... Oil supply line, 7
... Electromagnetic pump, 8 ... Oil tank, 9 ... Backflow prevention mechanism, 10 ... Solenoid on-off valve, 11 ... Check valve, 12 ... Oil strainer, 13 ... Injection port . 9- Go to M

Claims (3)

[Claims] (1) A bypass nozzle is provided as an oil spray nozzle, and a bypass line of the bypass nozzle connects an oil supply path to the bypass nozzle via an electromagnetic proportional control valve.
A combustion amount adjustment mechanism for the gun-type burner, characterized in that the gun-type burner is returned to a proper position upstream of the electromagnetic pump and downstream of the oil tank, and the bypass path is provided with an oil backflow prevention mechanism. . (2) A combustion amount adjusting mechanism for a gun-type burner, wherein the oil backflow prevention mechanism described in item 1 is constituted by an electromagnetic on-off valve. (3) A combustion amount adjusting mechanism for a gun-type burner, wherein the oil backflow prevention mechanism described in item 1 is constituted by a check valve.