JP2709994B2 - Variable spray oil burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the amount of fuel in a spray amount variable petroleum burner used for domestic water heaters, bath kettles with water heaters, and the like.

[0002]

2. Description of the Related Art As a conventional example which is technically closest to the present invention, an electromagnetic pump which pumps oil sucked from an oil tank at a high pressure, and the oil pumped at a high pressure, a part of which is injected into a combustor from a spray port. There is a return nozzle that sprays and returns the rest to the oil feed pipe through the oil return path, and a spray quantity variable oil burner provided with an oil solenoid valve and a pressure regulating valve in the middle of the oil return pipe.

[0003]

However, in such a conventional example, the amount of oil sprayed from the return nozzle is adjusted only by adjusting the pressure on the return side of the return nozzle by the pressure adjusting valve. Therefore, the variable ratio (turndown ratio) of the spray amount is generally about 5: 1, and the spray amount required for home water heaters and the like is approximately 5.0 to 0.7 liter / hour. There was a problem that it was impossible to be satisfied.

The present invention has been made in view of such a conventional problem, and the amount of spray is adjusted by controlling the pressure of an electromagnetic pump in a low spray amount region while keeping the oil return pipe constant.
Open the solenoid valve provided in the middle of, and control the return side pressure of the return nozzle by the pressure adjustment valve provided in the middle of the oil return pipe,
In the high spray amount region, the oil solenoid valve provided in the middle of the oil return pipe is closed to control the discharge pressure of the electromagnetic pump.
The purpose of the present invention is to increase the variable ratio (turndown ratio) of the spray amount from the conventional 5: 1 to 7: 1 by using the step adjustment method. To achieve the above objective,
In the variable-volume petroleum burner of the present invention, the electromagnetic pump for high-pressure pumping the oil sucked from the oil tank and the oil high-pressure pumped from the electromagnetic pump are partially sprayed into the combustor from the spray port, and the remainder is A return nozzle for returning to the oil return pipe through the oil return path, one end connected to the oil return path, the other end connected to the suction side of the electromagnetic pump, and an oil return pipe provided in the middle of the oil return pipe; oil solenoid valve and a pressure regulating valve that is, the a spray amount variable oil burners comprising a controller for controlling the electromagnetic pump and the oil solenoid valve the pressure adjustment valve, by the controller, the low spray volume region , The pressure of the electromagnetic pump is kept constant, and the solenoid valve
Opening, the return pressure of the return nozzle is controlled by a pressure regulating valve provided in the middle of the oil return pipe, and in the high spray amount area, the oil solenoid valve provided in the middle of the oil return pipe is closed, and the discharge pressure of the electromagnetic pump is reduced. A configuration was adopted in which the amount of spray was controlled by controlling the amount of spray.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing one embodiment of the present invention.
First, the configuration will be described. Reference numeral 1 denotes an electromagnetic pump, the oil suction side of which is connected to an oil tank 4 via an oil feed pipe 7-1.
The oil discharge side is connected via an oil feed pipe 7-2 to the oil forward path 8 side of the nozzle holder 2 having an oil forward path 8 and an oil return path 9 inside. Pressure detecting means 11 is provided in the middle of the oil feed pipe 7-2.

The return nozzle 3 is connected to the tip of the nozzle holder 2, and the oil return path 9 of the nozzle holder 2 is connected to the middle of the oil feed pipe 7-1 via the oil return pipe 10. An oil solenoid valve 5 and a pressure adjustment valve 6 are connected in the middle of the oil return pipe 10, and the electromagnetic pump 1, the oil solenoid valve 5, and the pressure adjustment valve 6 adjust the amount of fuel with respect to the required heat amount.

[0007]

Next, the operation will be described. The oil sucked from the oil tank 4 by the electromagnetic pump 1 is pressurized and supplied to the return nozzle 3 through the oil feed pipe 7-2. Return nozzle 3
Then, a part of the oil is sprayed, and the rest passes through the oil solenoid valve 5, the pressure regulating valve 6, and the like, and is returned to the inlet side of the electromagnetic pump 1. Here, the adjustment of the spray amount will be described with reference to FIG.

FIG. 2 shows that the return nozzle 3 is set to 1.0 GPH.
The discharge pressure of the electromagnetic pump 1 is constant at 7 kgf / cm ² when the oil electromagnetic valve 5 is open, and 7 kgf / cm ^{2 to} 15 kgf / cm when the oil electromagnetic valve 5 is closed.
Relationship between the pressure in the oil return pipe 10 and the amount of oil sprayed from the return nozzle 3 when the pressure is varied up to ² (graph a), the discharge pressure of the electromagnetic pump 1 and the oil spray from the return nozzle 3 The relationship between the quantities (graph b) is shown.

[0009] That is, adjustment of the spray amount when the oil solenoid valve 5 is open, due pressure regulating valve 6, a row Umono by adjusting the hydraulic pressure in the oil return pipe 10, that is, juicing pressure regulating valve 6 As the pressure is reduced , the pressure in the oil return pipe 10 increases and the spray amount increases . In this example, the return pressure is 1 kgf / cm ² , the spray amount is 0.7 liter / hour, and the return pressure is 3.5 kgf / cm ^{2.
In the case of 2} , the spray amount could be controlled almost proportionally up to 3.7 liter / hour (graph a).

When the oil solenoid valve 5 is closed, the electromagnetic pump 1
The spray amount is adjusted by changing the discharge pressure of
In this example, the discharge pressure of the electromagnetic pump 1 is 7 kgf / cm ² , the spray amount is 3.8 liter / hour, and the discharge pressure of the electromagnetic pump 1 is 15 kgf / cm ^2.
It became possible to change the spray volume in a proportion of approximately 5.0 liters / hour in cm ² almost proportionally (graph b).

The discharge pressure of the electromagnetic pump 1 is adjusted by the oil feed pipe 7.
The discharge pressure of the electromagnetic pump 1 was detected by the pressure detecting means 11 provided in the middle of -2, and the output value of the electromagnetic pump 1 was controlled by the controller 12. Electromagnetic pump 1
Is controlled by frequency control in this embodiment.

[0012]

As described above, according to the present invention, in the low spray amount region, the controller keeps the pressure of the electromagnetic pump constant and opens the electromagnetic valve provided in the middle of the oil return pipe.
The return pressure of the return nozzle is controlled by a pressure regulating valve provided in the middle of the oil return pipe, and in the high spray amount region,
Since the oil solenoid valve provided in the middle of the oil return pipe is closed and the discharge pressure of the electromagnetic pump is controlled to control the spray amount, the variable range of the spray amount is 5: 1 (3.7). Liter / hour to 0.7 liter / hour)
(5.0 liters / hour to 0.7 liters / hour). Further, in this invention, in the low spray amount region, the controller keeps the pressure of the electromagnetic pump constant, and controls the return-side pressure of the return nozzle by the pressure regulating valve provided in the middle of the oil return pipe. Therefore, one set of the solenoid valve and the pressure regulating valve may be used, so that the structure is simple and the manufacturing cost can be reduced.

With this, the calorie required for home water heaters and the like is about 4,500 kcal / hour (No. 3) to 38,000 kcal.
/ Hour (No.25) can be changed in a stepless manner. Conventionally, the ON-OFF control is adopted in the low calorie range, and about 30,000 kcal / hr (No.20) ) Can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the return pressure in an oil return pipe and the spray amount of oil from a return nozzle (a), and the relationship between the discharge pressure of an electromagnetic pump and the spray amount of oil from a return nozzle (b) in the present invention. .

FIG. 3 is a graph showing a relationship between a return pressure in a conventional oil return pipe and a spray amount of oil from a return nozzle.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electromagnetic pump 2 nozzle holder 3 return nozzle 4 oil tank 5 oil solenoid valve 6 pressure regulating valve 7 oil feed pipe 8 oil forward path 9 oil return path 10 oil return pipe 11 pressure detecting means 12 controller

Claims (1)

(57) [Claims] 1. An electromagnetic pump for high-pressure pumping oil sucked from an oil tank, and a part of the oil pumped from the electromagnetic pump for high-pressure pumping, which is sprayed into a combustor from a spray port, and the rest is provided with an oil return path. A return nozzle for returning to the oil return pipe, one end connected to the oil return path, the other end connected to the suction side of the electromagnetic pump, and an oil solenoid valve provided in the middle of the oil return pipe and the pressure regulating valve, wherein a spray amount variable oil burners comprising a controller for controlling the electromagnetic pump and the oil solenoid valve the pressure adjustment valve, by the controller, the low spray volume region, the pressure of the electromagnetic pump the set constant, electrostatic provided in the middle of the oil return pipe
The magnetic valve is opened, and the return pressure of the return nozzle is controlled by a pressure regulating valve provided in the middle of the oil return pipe. In a high spray amount area, the oil solenoid valve provided in the middle of the oil return pipe is closed, and the electromagnetic pump is closed. A spray amount variable oil burner characterized in that the spray amount is controlled by controlling the discharge pressure of the oil.