JP3008535B2 - Spray nozzle for combustion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray nozzle for combustion, and more particularly, to a spray nozzle for combustion which can return a part of a fuel liquid sent to the nozzle to a tank side through a return slit.

[0002]

2. Description of the Related Art As shown in FIG. 7, a fuel spray nozzle for adjusting a spray flow rate by returning a part of fuel to a tank is a liquid fuel fed from a tank 1 to a fuel spray nozzle 3 by a pump 2. , And a part thereof is returned to the tank 1 from the return path 4 through the return hole of the nozzle 3. Numeral 5 is an adjusting valve for adjusting the return amount to the tank 1. As shown in FIG. 8, the conventional spray nozzle for combustion has a spray nozzle main body 10 and a distributor 20 fitted in an inner hole 11 thereof. Spray nozzle body 1
0 has a spray hole 12 at the center of its tip.
The distributor 20 has a return hole 2 passing through the center thereof.
1 and a shoulder 22 in contact with the inner hole 11 of the nozzle body 10
Are provided with a plurality of distribution slits 23. The liquid fuel sent from pump 1 is spray nozzle body 1
Through the distribution slit 23, the air enters the spray standby chamber 30 through the inner hole 11, and is ejected from the spray hole 12.
A part is returned from the spray standby chamber 30 to the tank 1 through the return hole 21.

[0003]

However, in the above-mentioned conventional spray nozzle for combustion, the return hole 2 of the distributor 20 is not provided.
1 coincides with the position of the spray hole 12 of the spray nozzle body 10, and the center of the swirl vortex formed by the liquid fuel that has entered the spray standby chamber 30 through the slit 23 is the return hole 2
Therefore, when the return flow rate increases and the spray amount decreases, there is a problem that air from the outside passes through the center of the swirling vortex and enters the return hole 21 together with the fuel liquid. Was.

Therefore, the present invention solves the above-mentioned disadvantages of the prior art, and reduces the spray flow rate and increases the return flow rate,
An object of the present invention is to provide a spray nozzle for combustion in which air is not entrained in a return fuel liquid.

[0005]

In order to achieve the above object, a spray nozzle for combustion according to the present invention comprises a spray nozzle body 40.
And a distributor 50 fixedly fitted in the inner hole 41 of the spray nozzle main body 40 , and the fuel standby through the shoulder 52 of the distributor 50 in front of the distributor 50.該噴from fog antechamber 60 spewing fuel liquid through tip center of the spray hole 42 of the spray nozzle body 40, and a portion of the fuel fluid return slit 55 from the spray antechamber 60 together with the pivoted delivery to the chamber 60 Spray nozzle for returning to the tank side through the return slit
55 , the distributor displaced from a position immediately below the spray hole 42
It is characterized in that it is provided in the peripheral part of 50 .

[0006]

Since the return slit is provided in the peripheral portion of the distributor, which is displaced from a position immediately below the spray hole, even if the vortex air descends into the spray standby chamber through the spray hole, the vortex air flows around the distributor. It does not reach the return slit of the part. Therefore, even if the amount is reduced and the return amount is increased, the air is reliably prevented from being mixed into the return fuel liquid through the center of the swirling vortex from the spray pores.

[0007]

1 and 2 show a first embodiment of the present invention. FIG. 1 is a cross-sectional view of a main part of a spray nozzle for combustion, and FIG. 2 is a plan view of a distributor.

[0008] The spray nozzle for combustion is a spray nozzle body 40.
And a distributor 50 fitted in the inner hole 41. The spray nozzle body 40 has a spray hole 4 at the center of its tip.
2 are provided. Further, the distributor 50 is provided with a plurality of distribution slits 53 formed in a shoulder portion 52 that is in contact with the inner hole 41 of the nozzle body 40. The above points are the same as the conventional one.

In this embodiment, a plurality of return slits 55 are provided from the periphery of the upper flat surface 54 of the distributor 50 to the middle of the shoulder 52, and the return slits 55 are provided.
A connection narrow path 56 is provided to penetrate through the thickness of the spray nozzle body 40 so as to be connected to the nozzle. This connection narrow path 56 is connected to the return path 4 in FIG. The fuel liquid that has entered the spray standby chamber 60 from the distribution slit 53 forms a swirling flow there, whereby swirling air A is generated at the center of the swirling flow by the spray holes 4.
2 formed. Part of the fuel liquid in the spray standby chamber 60 is sprayed to the outside through the spray holes 42, and part of the fuel liquid passes from the outside of the swirling flow through the return slit 55,
To return to the tank via return path 4. Since the position of the return slit 55 is sufficiently away from the position where the swirling air A descends, the air of the swirling air A is prevented from entering the return slit 55.

FIGS. 3 and 4 show a second embodiment of the present invention. FIG. 3 is a sectional configuration view of a main part of the spray nozzle for combustion, and FIG.
FIG. 3 is a plan view of a distributor of a spray nozzle for combustion. In this embodiment, the inner cylinder 43 is provided inside the spray nozzle body 40 to form a double pipe, and the distributor 50 is fitted to the upper end of the inner cylinder 43 and fitted inside the spray nozzle body 40. The inside of the inner cylinder 43 is used as a fuel supply passage 43a, and the outside is used as a fuel return passage 43b. A plurality of distribution holes 57 penetrating through the thickness of the distributor 50 from the supply passage 43a and opening in the middle of the shoulder portion 52 are provided. And a plurality of distribution slits 53 extending from the top to the periphery of the upper end flat surface 54. On the other hand, a return slit 55 is provided at a position different from the distribution slit 53.
Is provided on the shoulder 52. Fuel supply passage 43a in inner cylinder 43
The fuel liquid entering the spray standby chamber 60 through the distribution hole 57 and the distribution slit 53 forms a swirling flow, part of which is sprayed from the spray hole 42 and part of which passes through the return slit 55. The return path 43 outside the inner cylinder 43
b. Since the return slit 55 is located at the periphery of the upper flat surface 54 sufficiently away from the position where the swirling air A descends, the air of the swirling air A is prevented from entering the return slit 55. Is done.

FIGS. 5 and 6 show a third embodiment of the present invention. FIG. 5 is a sectional configuration view of a main part of the spray nozzle for combustion, and FIG.
FIG. 6 is a sectional view taken along line XX of FIG. 5. In this embodiment, the distributor 5
0, a plurality of slits 53 for distributing fuel liquid are formed between the shoulder 52 of the distributor 50 and the separation wall 70, and the outside of the distributor 70 and the inner hole 4 of the spray nozzle 40 are formed.
A plurality of return slits 55 are formed between them.
80 is a distributor presser. 58 is a fuel distribution alley, 5
9 is a return alley. The fuel liquid that has entered the spray standby chamber 60 from the fuel distribution path 58 through the distribution slit 53 forms a swirling flow, and a part thereof is sprayed from the spray hole 42,
A part passes through the return slit 55 and returns
Recovered from 9. Since the return slit 55 is located at the periphery of the upper flat surface 54 sufficiently away from the position where the swirling air A descends, the air of the swirling air A is prevented from entering the return slit 55. Is done.

[0012]

According to the present invention the above configuration consists of action, according to the combustion spray nozzle according to claim 1, near the distributor 50 to outside the return slit 55 from a position directly below the spray hole 42 since there is provided the parts, even vortex air a has dropped to spray standby chamber 60 through the spray hole 42, the return slit in the peripheral portion of the vortex air a distributor 50 5
5 does not reach. Therefore, even if the spray amount is reduced and the return amount is increased, it is possible to reliably prevent air from entering the return hole and being mixed into the return fuel liquid.

[Brief description of the drawings]

FIG. 1 is a sectional configuration view of a main part of a combustion spray nozzle according to a first embodiment of the present invention.

FIG. 2 is a plan view of the distributor in the first embodiment.

FIG. 3 is a sectional configuration diagram of a main part of a combustion spray nozzle according to a second embodiment of the present invention.

FIG. 4 is a plan view of a distributor according to a second embodiment.

FIG. 5 is a sectional view of a main part of a combustion spray nozzle according to a third embodiment of the present invention.

FIG. 6 is a sectional view taken along line XX of FIG. 5;

FIG. 7 is a configuration diagram showing an example of a combustor provided with a spray nozzle for combustion.

FIG. 8 is a sectional view showing an example of a conventional spray nozzle for combustion.

[Explanation of symbols]

 Reference Signs List 40 Spray nozzle body 42 Spray pore 50 Distributor 53 Distribution slit 55 Return slit 60 Spray standby chamber A Eddy air

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-240306 (JP, A) JP-A-1-102205 (JP, A) JP-A-2-217707 (JP, A) JP-A-49-49 16021 (JP, A) JP-B-56-47441 (JP, B2) JP-B-38-12073 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 11/38 F23D 11 / 28

Claims (1)

(57) [Claims] And 1. A spray nozzle body 40, and a distributor 50 which is fixedly Sohama the inner hole 41 of the spray nozzle body 40, the fuel solution through a shoulder 52 of the distributor 50 Distributor
The fuel is swirled and delivered to a spray standby chamber 60 in front of 50 , and the fuel liquid is ejected from the spray standby chamber 60 through a spray hole 42 at the center of the tip of the spray nozzle body 40 , and a part of the fuel is sprayed.
The fuel liquid is returned from the spray standby chamber 60 to the return slit 5.
5 through a combustion spray nozzles to return to the tank side, the spray hole 4 the return slit 55
2. A spray nozzle for combustion provided in a peripheral portion of the distributor 50 deviated from a position immediately below the spray nozzle.