JP3089841B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus using a bypass nozzle.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, in a proportional control burner or the like using a bypass nozzle 1, oil fuel is supplied to the bypass nozzle 1 by a pump 3 provided on an outward path 2 and a part of the fuel is sprayed. The fuel was adjusted by returning from the bypass nozzle 1 to the return path 4 without any trouble. The amount of return from the bypass nozzle 1 to the return path 4 is adjusted by providing an adjustment valve 5 in the return path 4 from which fuel is returned.

[0003]

However, in the case of the above-mentioned conventional combustion apparatus, since the return amount is controlled by an adjusting valve such as a needle valve, dust is easily caught by the narrow passage area, and the control is stable. There was a problem of low quality. In addition, there is a disadvantage that a large width fuel input cannot be adjusted by the valve adjustment. Japanese Patent Application Laid-Open No. 51-44322 discloses an oil supply pump using two pumps, an oil supply pump and a fuel spray pump. The amount of fuel returned from the nozzle is not specifically adjusted, and the amount of fuel returned from the nozzle is adjusted by a return valve. Therefore, similarly to the above, the problem of dust biting and the problem that large combustion input cannot be adjusted still remain.

Accordingly, an object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a combustion device using a bypass nozzle which can stably secure a high turndown ratio (TDR) without generating dust.

[0005]

In order to achieve the above object, a combustion apparatus according to the present invention uses a bypass nozzle 10 ,
Without ejecting supplying a part of fuel supplied to the bypass nozzle 10 through the forward path 20 to the forward, backward 50
A combustion device wherein the fuel input is adjusted by returning to the side, wherein a first nozzle ejection amount adjustment pump 30 and a second nozzle ejection amount adjustment pump 40 are arranged in series on the outward path 20 as a pair. Together with the return end 5 of the return path 50
1 is connected between the first and second nozzle ejection amount adjustment pump 30 and 40 of the forward path 20, the first nozzle ejection amount adjustment
Supply pressure of regulating pump 30 and second nozzle ejection amount regulating pump
By adjusting the supply pressure of 40 to have its total pressure
To adjust the primary pressure of the bypass nozzle 10, and
Adjusting the supply pressure of the second nozzle ejection amount adjustment pump 40
From the return path 50 to the bypass nozzle 10
By adjusting the bypass pressure, the bypass nozzle 1
0 secondary pressure is adjusted to reduce bypass noise.
It is characterized in that the amount of jet from the fuel tank 10 is controlled .

[0006]

The fuel supply pressure (primary pressure) applied to the bypass nozzle is the sum of the supply pressure by the first nozzle ejection amount adjustment pump and the supply pressure by the second nozzle ejection amount adjustment pump,
On the other hand, the return pressure (secondary pressure) as the return resistance applied to the bypass nozzle from the return path is the supply pressure of the second nozzle ejection amount adjustment pump located upstream of the connection point at the return end of the return path. Therefore, by changing the supply pressure of the second nozzle ejection amount adjusting pump, the width of the ejection amount from the nozzle can be greatly changed more than linearly. Further, since no valve for adjusting the return amount of fuel is provided on the return path, the disadvantage of biting dust is eliminated.

[0007]

FIG. 1 is a diagram showing the overall configuration of a device according to the present invention, and FIG. 2 is a diagram showing the relationship between the supply pressure of an ejection amount adjusting pump and the ejection amount and return amount of a nozzle.

[0008] Outgoing path for supplying oil to the bypass nozzle 10
20 is a first nozzle ejection amount adjusting pump 30 having a fixed supply pressure.
And a pair of a second nozzle ejection amount adjustment pump 40 that is variable in supply pressure and that is relatively close to the pump 30. The return path 50 of the oil that is returned without being ejected from the bypass nozzle 10 has a return end 51 corresponding to the forward path.
It is connected between the 20 first and second nozzle ejection amount adjusting pumps 30 and 40.

Now, the supply pressure of the supply pressure-fixed first nozzle ejection amount adjustment pump 30 is P _O , and the supply pressure of the supply pressure variable second nozzle ejection amount adjustment pump 40 is the minimum pressure P _min.
, The pressure (primary pressure) applied to the nozzle 10 from the outward path 20 is P _O + P _min , and
The return pressure (secondary pressure) as a return resistance applied to the pressure becomes _Pmin , and the amount of fuel injected from the nozzle, that is, the fuel input, is minimized. Conversely, the second nozzle ejection amount adjustment pump
Assuming that the supply pressure of 40 is the maximum pressure _Pmax , the pressure (primary pressure) applied to the nozzle 10 from the outward path 20 is P _O + _Pmax , and the return pressure (secondary pressure) applied to the nozzle 10 from the return path 50 as the return resistance. Side pressure) becomes _Pmax , and the ejection amount from the nozzle, that is, the fuel input becomes the maximum. That is, when the supply pressure of the second nozzle ejection amount adjustment pump 40 is increased,
The primary pressure increases, and the secondary pressure, which is the resistance of the return amount from the nozzle 10, increases, as shown in FIG.
The amount of eruption from 10 can be greatly increased. Conversely, when the supply pressure of the second nozzle ejection amount adjustment pump 40 is reduced, the ejection amount from the nozzle 10 can be greatly reduced.

The second nozzle ejection amount adjusting pump 40
The minimum pressure P _min and the maximum pressure P _max are set as boundaries between the air bite generation region and the onion spray generation region of the bypass nozzle 10, respectively.

The first nozzle ejection amount adjusting pump 30 also includes:
A variable supply pressure pump may be used together with the second nozzle ejection amount adjustment pump 40. In this case, for example, the two pumps 30, 40 respectively to the pressure variable pump 3~10Kg / cm ^2, is set to the two pumps 30 and 40 are both 3 Kg / cm ^2, as the supply total pressure in the primary side of the bypass nozzle 10 pressure is applied in 6 kg / cm ^2, the secondary side of the bypass nozzle 10 pressure is applied to about 3 Kg / cm ² as a resistor, ejection amount from the bypass nozzle 10 is minimized. On the other hand, both pumps 30 and 40 are 10kg / cm
^When set to ² , the primary side of the bypass nozzle 10 receives a pressure of 20 kg / cm ² as the total supply pressure,
A pressure of about 10 kg / cm ² is applied to the secondary side of 10 as resistance, and the amount of jet from the bypass nozzle 10 is maximized.

[0012]

According to the present invention, according to the combustion apparatus of the first aspect, the bypass nozzle 10 is provided.
Without jetting and supplying a part of the fuel supplied to the bypass nozzle 10 through the outward path 20 ,
In a combustion apparatus that adjusts the fuel input as return back to 50, the first nozzle ejection amount adjustment pump 30 and the second nozzle ejection amount adjustment pump 4 to the forward path 20
0 is arranged in series as a pair, and the return end 51 of the return path 50 is connected between the first and second nozzle ejection amount adjustment pumps 30 and 40 of the forward path 20 , and the first nozzle
Supply pressure of ejection amount adjustment pump 30 and adjustment of ejection amount of second nozzle
By adjusting the supply pressure of the regulating pump 40, the total pressure
Adjust the primary pressure of the bypass nozzle 10 with force
Supply of the second nozzle ejection amount adjustment pump 40
The pressure is adjusted to apply a pressure from the return path 50 to the bypass nozzle 10.
Adjusting the return pressure
The secondary pressure of the nozzle 10 is adjusted, and
Since the amount of ejection from the pass nozzle 10 is controlled, the amount of ejection from the bypass nozzle 10, that is, the fuel input, can be largely changed and adjusted from a large input to a small input. In addition, since there is no need for a control valve for adjusting the fuel return amount, there is no possibility of adjustment failure or poor adjustment due to dust biting,
Stable and reliable fuel adjustment can be performed over a long period of time.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an apparatus according to the present invention.

FIG. 2 is a diagram showing a relationship between a supply pressure of an ejection amount adjustment pump, a nozzle ejection amount, and a return amount.

FIG. 3 is an overall configuration diagram of a conventional device.

[Explanation of symbols]

 10 Bypass nozzle 20 Outbound path 30 First nozzle ejection volume adjustment pump 40 Second nozzle ejection volume adjustment pump 50 Return path 51 Return end of return path

Continuation of front page (72) Inventor Shinji Sasaki 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Noritsu Co., Ltd. (56) References JP-A-2-110210 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 1/00 105 F23D 11/28 F23D 11/38 F23K 5/04

Claims (1)

(57) [Claims] With 1. A bypass nozzle 10, without jetting supplying a part of fuel supplied to the bypass nozzle 10 forwardly through the forward path 20 to adjust the fuel input in the back to the return 50 side A first nozzle ejection amount adjusting pump 30 in the forward path 20 .
And the second nozzle ejection amount adjustment pump 40 are arranged in series as a pair, and the return end 51 of the return path 50 is connected to the first and second nozzle ejection amount adjustment pumps 30 and 4 of the forward path 20 .
0 , the first nozzle ejection amount adjustment pump 3
Supply pressure of 0 and supply of the second nozzle ejection amount adjustment pump 40
By adjusting the pressure, the total pressure
Adjusting the primary side pressure of the pass nozzle 10;
Adjusting the supply pressure of the nozzle ejection amount adjusting pump 40 to return 5
From 0, the return pressure applied to the bypass nozzle 10 is
By adjusting the secondary side of the bypass nozzle 10
Adjust the pressure, which allows the bypass nozzle 10
A combustion device characterized in that the amount of fuel jet is controlled .