JPH0674810U - Air volume control structure of pressure spray burner - Google Patents

Abstract

(57) [Summary] [Purpose] This is a pressure atomization burner with variable combustion amount, which is intended for stable combustion at low heat. [Composition] A fixed damper 5 having ventilation holes 5a and 6a having different opening ratios and a movable damper 6 are provided, and by rotating the movable damper 6, the ventilation amount can be changed to a large or small amount, and the air amount can be minimized. Ventilation hole 6a of movable damper 6 when squeezed
Since the control plate 7 is provided so as to face the above, it is a structure that suppresses the wind speed when the air volume is small.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure spray burner used for a hot water heater or the like, and relates to an air volume adjusting structure in which the fuel flow rate and the blown air volume can be varied depending on the amount of hot water supplied.

[0002]

[Prior art]

 The pressure spray burner guides the combustion air sent from the blower into the blower tube, positions the spray nozzle and the ignition electrode inside the blower tube, sprays the fuel from the spray nozzle, and ignites and burns by the spark of the ignition electrode. It is used as a heat source for water heaters and heaters.

In most burners, the number of rotations of the blower is constant, and therefore, the one that does not adjust the thermal power is the mainstream, and when used in a water heater of a direct water supply type, the fuel flow rate and the air flow rate are variable, although the number is small. Those that do have been adopted.

[0004]

[Problems to be solved by the device]

 The latter of the above prior arts is required to control, for example, the maximum thermal power of 40000 Kcal to the minimum of 10000 Kcal. The air flow rate from a constant speed blower is changed by changing the damper opening ratio, and the fuel flow rate is changed. A method of changing the capacity of the pump is used, but it has drawbacks such as excessive wind speed, uneven flame distribution, and a large amount of smoke, and it is particularly desirable to stabilize the air blow during small heat. .

[0005]

[Means for Solving the Problems]

 According to the present invention, the spray nozzle 3 and the ignition electrode 4 to which the fuel is sent from the fuel pump 8 are seen in front of the inside of the blower tube 2 to which the combustion air is sent from the blower 1, and the pressure for changing the fuel and the blown air amount is set. In the spray type burner, the fixed damper 5 and the movable damper 6 having the ventilation holes 5a and 6a each having a different opening shape are provided inside the blower tube 2 behind the spray nozzle 3, and the movable damper 6 is rotated. The present invention relates to an air volume control structure of a pressure spray burner in which the air volume can be changed to large and small, and a control plate 7 is provided so as to face the air hole 6a of the movable damper 6 when the air volume is minimized. It is a thing.

[0006]

[Action]

 According to the present invention, the combustion air is sent from the blower 1 into the blower tube 2 to the spray nozzle 3 by the fuel pump 8, and the discharge spark of the ignition electrode 4 ignites the fuel ejected from the spray nozzle 3 to blow the air. Combustion is started by mixing with air sent from No. 1.

Then, the combustion thermal power switches the capacity of the fuel pump 8 to adjust the fuel flow rate, and when the combustion air also rotates the movable damper 6, the ventilation holes 6 a of the movable damper 6 and the ventilation of the fixed damper 5 are changed. The aperture 5 changes due to the overlap with the holes 5a, and the amount of passing air is varied. Further, when the combustion amount is reduced in proportion to the hot water supply amount, the control plate 7 is provided so as to face the ventilation hole 6a portion of the movable damper 6 that restricts the air amount, and passes through the narrowed ventilation hole 6a. The wind hits the control plate 7 once and diffuses, and then is supplied toward the spray nozzle 3 for more stable control of combustion.

[0008]

【Example】

 The configuration will be described below with reference to the drawings showing the embodiments. 1 is a blower that supplies combustion air, 2 is a blower tube that guides the air supplied from the blower 1, and 3 is a front portion inside the blower tube 2. The desired spray nozzles 4 are ignition electrodes aimed at the tip of the spray nozzle 3, which ignite the fuel ejected from the spray nozzle 3 by spark discharge.

Reference numeral 5 denotes a fixed damper provided in the blower tube 2 between the spray nozzle 3 and the blower 1, and has a fan-shaped ventilation hole 5a. Reference numeral 6 denotes a movable damper that is concentrically slidably in contact with the fixed damper 5 and is rotatable. The movable damper 6 is provided with a small hole shape or a ventilation hole 6a with an acute angled end. By changing the opening shape from the ventilation hole 5a and rotating the movable damper 6, the amount of ventilation can be varied.

Reference numeral 7 denotes a control plate to which the wind that has passed through the ventilation holes 5a and 6a when the movable damper 6 is rotated to reduce the aperture ratio hits, and the wind blown out from the ventilation hole 6a once hits the control plate 7. It diffuses to the surroundings and is supplied toward the spray nozzle 3 so as to prevent uneven displacement of the combustion flame and incomplete combustion. Of course, when the opening ratio is increased, the wind that has passed through the ventilation holes 5a and 6a also hits the control plate 7, but since the amount of air that passes through the ventilation holes 5a and 6a is large, the influence of the control plate 7 is not great.

Reference numeral 8 denotes a fuel pump directly connected to the spray nozzle 3, which pumps fuel toward the spray nozzle 3. Reference numeral 9 is an electromagnetic opening / closing valve provided in the bypass path 10 for returning the fuel from the spray nozzle 3 according to the change in the combustion amount, 11 is a shaft connected to the movable damper 6, and rotating the movable damper according to the combustion amount. It is rotated by the motor 12 or manually to change the air flow rate according to the intersecting ratio of the ventilation hole 5a of the fixed damper 5 and the ventilation hole 6a of the movable damper 6.

[0012]

[Effect of device]

 The present invention has the above-described structure and operation, and the amount of air can be changed by changing the area through which the air passes, by intersecting the ventilation holes 5a and 6a of the fixed damper 5 and the movable damper 6, respectively. However, since the blowing capacity of the blower 1 is always constant, the wind velocity passing through the ventilation holes 6a when the aperture ratio is reduced is increased and is supplied to the spray nozzle 3 side. Since it suppresses and diffuses, it does not cause problems such as uneven combustion flame and generation of oil smoke.

[Brief description of drawings]

FIG. 1 is a sectional view of essential parts showing an embodiment in which a pressure spray burner according to the present invention is attached to a combustion chamber of a water heater.

FIG. 2 is a cross-sectional view showing a state in which a ventilation hole of a movable damper and a control plate face each other at the minimum air volume.

FIG. 3 is a cross-sectional view showing a state in which a ventilation hole of a movable damper and a control plate face each other at the maximum air volume.

FIG. 4 is a bottom view of the damper part showing a superposed state of ventilation holes of the movable damper and the fixed damper at the minimum air volume.

FIG. 5 is a bottom view of the damper part showing a superposed state of the ventilation holes of the movable damper and the fixed damper at the maximum air volume.

[Explanation of symbols]

 1 Blower 2 Blower 3 Spray nozzle 4 Ignition electrode 5 Fixed damper 5a Ventilation hole 6 Movable damper 6a Ventilation hole 7 Control plate 8 Fuel pump

Claims (1)

[Scope of utility model registration request] 1. A pressure for causing a spray nozzle 3 and an ignition electrode 4 to which fuel is sent from a fuel pump 8 to be seen in front of an inside of a blower tube 2 to which combustion air is sent from a blower 1 and for varying a fuel amount and an air flow rate. In the spray-type burner, the fixed damper 5 and the movable damper 6 having the ventilation holes 5a and 6a each having a different opening shape are provided inside the blower tube 2 behind the spray nozzle 3, and by rotating the movable damper 6, An air flow rate adjusting structure for a pressure spray burner in which the air flow rate can be varied between large and small, and a control plate 7 is provided facing the air flow hole 6a of the movable damper 6 when the air flow rate is minimized.