CN211822370U

CN211822370U - Ejector for combustor

Info

Publication number: CN211822370U
Application number: CN202020088719.6U
Authority: CN
Inventors: 刘晓刚; 柯情; 王帅东; 俞瑜; 郑军妹
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2020-10-30
Anticipated expiration: 2030-01-15

Abstract

The utility model relates to an ejector for a burner, which comprises an ejector pipe, an air inlet end, a contraction section with a cross section gradually reduced from the air inlet end along the airflow flowing direction, and a downstream port of the contraction section being a roar; the nozzle seat is arranged at the position, adjacent to the air inlet end, of the injection pipe; the nozzle is arranged on the nozzle seat; the method is characterized in that: the number of the nozzles is at least two, and the nozzle orifice of each nozzle faces the throat. Compared with the prior art, the utility model has the advantages of: the gas air current that the nozzle jetted out does not interfere with each other, can inhale more air, has improved and has drawn efficiency, and the spout of each nozzle faces the roar mouth, makes the gas air current that the nozzle jetted out so enter into roar mouth more, has improved and has drawn the ability.

Description

Ejector for combustor

Technical Field

The utility model belongs to the technical field of cooking utensils, concretely relates to ejector for combustor.

Background

The gas-cooker is the kitchen utensils and appliances that people commonly used in daily life, and the ejector that sets up in the gas-cooker is an important part of gas-cooker, and its effect is: the gas and the air are mixed to form a certain pressure, so that the resistance loss of a channel is overcome, a certain speed is obtained at the outlet of a fire hole, and the stability of combustion flame is ensured; injecting low-energy air by high-energy fuel gas, and uniformly mixing the high-energy fuel gas and the low-energy air in an injector; a certain amount of fuel gas is delivered, and the heat flow required by the combustor is ensured.

The existing ejector basically comprises a gas nozzle and an ejector pipe, wherein the ejector pipe consists of a contraction section at the front end, a mixing section in the middle and a diffusion section at the rear end, and the gas nozzle is arranged aiming at a gas inlet of the contraction section. As for a Chinese invention patent 'an ejector pipe' previously applied by the applicant, the patent number of which is zl201310122553.x, and the publication number of which is CN103234201B, an ejector pipe is disclosed, the inner cavity of which is, along the direction from the inlet to the outlet, sequentially provided with a horn section, a transition section and a tail port matched with a burner head of a burner, and a throat is formed between the horn section and the transition section, the outer contour of the horn section is formed by intersecting a plurality of circles or a plurality of ellipses similar to circles, the centers of the circles or the centers of the ellipses are positioned on the same first circle and are uniformly distributed relative to the center of the first circle, nozzles matched with the ejector pipe are arranged at the centers, and the number of the nozzles is equal to the number of the circles or the ellipses; the cross section of the horn section is gradually reduced, and the cross section shape of the throat is the same as that of the horn section; the cross section area of the transition section is gradually increased, and the transition section is gradually changed from the same as the throat to the same as the cross section of the tail port. The ejector pipe avoids mutual interference between the primary air streams, increases the primary air supply amount, promotes the mutual mixing of the air streams entering the inner cavity of the ejector pipe and the air, and increases the ejection capacity.

However, in the above patent, the nozzle adapted to the ejector pipe is arranged at the center of a circle or at the center, the nozzle orifice may not face the throat, and the projection of the nozzle along the center line toward the throat may not be located in the throat, so that the air flow ejected from the nozzle is ejected through the horn section, but the ejected air flow impacts the inner wall of the horn section, and a backflow of the air flow may occur, so that the air flow entering the throat is reduced, the amount of the introduced air is reduced, and the ejection capability is reduced to some extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to the current situation of above-mentioned prior art, provide an increase to the introduction of air and then reach the ejector for combustor that improves and draw the ability purpose of penetrating.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: an injector for a combustor includes

The injection pipe is provided with an air inlet end and comprises a contraction section of which the cross section is gradually reduced from the air inlet end along the flowing direction of air flow, and the downstream port of the contraction section is a throat;

the nozzle seat is arranged at the position, adjacent to the air inlet end, of the injection pipe;

the nozzle is arranged on the nozzle seat;

the method is characterized in that:

the number of the nozzles is at least two, and the nozzle orifice of each nozzle faces the throat.

In order to improve ejection capacity, the nozzle orifices fall in the throat along a projection of the centre line of the ejector tube towards the throat, and the centre line of at least one of the nozzle orifices is substantially parallel to the centre line of the ejector tube. Thus, the air flow is prevented from flowing backwards, so that the air flow enters the throat more, and the air introduction is increased.

In order to fully mix gas airflow and air, the injection pipe further comprises a straight pipe section and an expansion section which are sequentially arranged along the airflow flowing direction, the straight pipe section is located between the contraction section and the expansion section, the cross sections of all the parts of the straight pipe section are equal along the airflow flowing direction, and the cross section of the expansion section is gradually increased. So, can make the gas air current that gets into in the straight tube section and air intensive mixing, effectively improve the primary air supply that has this combustor of penetrating the pipe, improve the primary air coefficient.

Preferably, the cross section of each part of the injection pipe is non-circular.

In order to improve the injection, the cross section of the throat is elliptical, and the projection of the center of the nozzle along the center line of the injection pipe towards the throat is on the long axis of the ellipse.

In order to suck more air, one of the preferred modes is: the number of the nozzles is two, the size H2 of a long axis of the throat is 14-16 mm, the size H1 of a short axis is 9-11 mm, and the distance H between the centers of the two nozzles on the long axis of the throat is 5-8 mm. Therefore, the injection capacity of the injection pipe is enhanced.

To suck more air, the second preferred mode is: the number of the nozzles is three, the size H4 of the long axis of the throat is 14-22 mm, the size H3 of the short axis is 9-11 mm, and the distance H5 between the centers of two adjacent nozzles on the long axis of the throat is 4-8 mm. Therefore, the injection capacity of the injection pipe is enhanced.

In order to facilitate air injection, the nozzle is positioned at the upstream of the air inlet end of the injection pipe, and the nozzle orifice of the nozzle faces the air inlet end of the injection pipe and is spaced from the air inlet end. In this way, the supply of primary air to the burner with the ejector tube is improved.

The nozzle holder has various structural forms, but preferably comprises a main pipe section extending along the flowing direction of the gas flow, the tail end of the main pipe section is provided with an air outlet section, and the nozzle is arranged on the tail end face of the air outlet section.

In order to enable gas flow to enter the throat, the center line of the main pipe section is basically coincident with or basically parallel to the center line of the injection pipe.

Compared with the prior art, the utility model discloses a nozzle has two at least and interval arrangement on the nozzle block in the ejector for combustor, and nozzle spun gas air current is mutual noninterference, can inhale more air, has improved and has drawn penetrating efficiency, and the spout of each nozzle is towards roating the mouth, so makes nozzle spun gas air current enter into roating the mouth more, has improved the injection ability; furthermore, the jets fall within the throat, in a projection towards the throat along the centre line of the injector tube, and the centre line of at least one of the jets is substantially parallel to the centre line of the injector tube, so that the occurrence of air flow back is prevented, so that more air enters the throat, increasing the introduction of air.

Drawings

Fig. 1 is a partial schematic structural diagram of an embodiment of the present invention;

fig. 2 is a cross-sectional view of an embodiment of the present invention;

FIG. 3 is a plan view of a nozzle holder in the embodiment;

fig. 4 is a schematic structural view of the ejector pipe in this embodiment;

FIG. 5 is a schematic view of the structure of FIG. 4 at another angle;

FIG. 6 is an orthographic view of a cross section where two nozzles are located at the throat;

figure 7 is an orthographic view of a cross section where three nozzles are located at the throat.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 7, an injector for a burner according to an embodiment of the present invention includes an injection pipe 1 and a nozzle holder 2.

As shown in fig. 1, 2, 4 and 5, the ejector tube 1 in this embodiment has an air inlet end 1a, the ejector tube 2 sequentially includes a contraction section 11, a straight tube section 12 and an expansion section 13 along an airflow flowing direction, the cross section of the contraction section 11 is gradually reduced along the airflow flowing direction, the cross sections of the straight tube section 12 are equal, and the cross section of the expansion section 13 is gradually increased; the upstream port of the convergent section 11 is an air inlet end 1a of the injection pipe 2, the downstream port of the convergent section 11 is a throat 111, and the downstream port of the convergent section 11 is connected with the straight pipe section 12. The cross section of each part of the injection pipe 1 is non-circular, can be elliptical, can also be rectangular, and can also adopt other shapes, in this embodiment, the cross section of each part of the injection pipe 1 is elliptical, as shown in fig. 5 and 6.

As shown in fig. 1 and 2, the nozzle holder 2 is arranged on the ejector pipe 1 adjacent to the air inlet end 1a through the bracket 3, the nozzle holder 2 is communicated with the ejector pipe 1, along the airflow flow path, the nozzle holder 2 is located upstream of the air inlet end 1a, a gap d is left between the nozzle holder 2 and the air inlet end 1a, the nozzle holder 2 comprises a main pipe section 2a extending along the airflow flow direction, an air outlet section 2b is arranged at the tail end of the main pipe section 2a, at least two nozzles 21 are arranged on the tail end surface of the air outlet section 2b, a gap d is left between the nozzles 211 of the nozzles 21 and the air inlet end 1a, a nozzle 211 is arranged at the center of the nozzle 21, the nozzle 21 is in fluid communication with the ejector pipe 1, the nozzle 211 of each nozzle 21 faces the throat 111, and the center line of at least one nozzle 211 is substantially parallel to the center line of the ejector pipe 1, in this embodiment, the nozzle orifice 211 of the nozzle 21 faces the air inlet end 1a of the injector pipe 1, and the projection of the nozzle orifice 211 of the nozzle 21 along the center line of the injector pipe 1 toward the throat 111 falls in the throat 111, and in this embodiment, as shown in fig. 6 and 7, the projection of the nozzle orifice 211 of the nozzle 21 along the center line of the injector pipe 1 toward the throat 111 falls on the long axis of the cross section of the throat 111. The central line of the main pipe section 2a is substantially coincident with or substantially parallel to the central line of the ejector pipe 1, as shown in fig. 2.

The number of the nozzles 21 in this embodiment may be three, specifically, as shown in fig. 2, 3, and 6, wherein a center line of the nozzle 211 located in the middle position coincides with a center line of the ejector pipe 1, and center lines of the nozzles 211 of the other nozzles 21 are parallel to the center line of the ejector pipe 1; the long axis dimension H4 of the throat 111 is 14 cm-22 mm, the short axis dimension H3 is 9-11 mm, the distance H5 between the centers of the spouts 211 of two adjacent nozzles 21 on the long axis of the cross section of the throat 111 is 4-8 mm, and the radius R of a circle where the vertex of the long axis of the throat 111 is located is 3-8 mm.

As shown in fig. 7, two nozzles 21 can be provided, the center lines of the nozzles 211 of the two nozzles 21 are both parallel to the center line of the injection pipe 1, the major axis dimension H2 of the throat 111 is 14-16 mm, the minor axis dimension H1 is 9-11 mm, the distance H between the centers of the two nozzles 211 on the major axis of the cross section of the throat 111 is 5-8 mm, and the radius R of a circle where the vertex of the major axis of the throat 111 is located is 3-8 mm.

Claims

1. An injector for a combustor includes

The injection pipe (1) is provided with an air inlet end (1a) and comprises a contraction section (11) with the cross section gradually reduced from the air inlet end (1a) along the flowing direction of air flow, and the downstream port of the contraction section (11) is a throat (111);

the nozzle seat (2) is arranged at the position, adjacent to the air inlet end (1a), of the injection pipe (1);

a nozzle (21) provided on the nozzle holder (2);

the method is characterized in that:

the number of the nozzles (21) is at least two, and the spray opening (211) of each nozzle (21) faces the throat (111).

2. The eductor as defined in claim 1, wherein: the spray orifices (211) fall in the throat (111) along a projection of the centre line of the injector tube (1) towards the throat (111), and the centre line of at least one of the spray orifices (211) is substantially parallel to the centre line of the injector tube (1).

3. The eductor as defined in claim 1, wherein: the injection pipe (1) further comprises a straight pipe section (12) and an expansion section (13) which are sequentially arranged along the airflow flowing direction, the straight pipe section (12) is located between the contraction section (11) and the expansion section (13), the cross sections of all parts of the straight pipe section (12) are equal along the airflow flowing direction, and the cross section of the expansion section (13) is gradually increased.

4. The eductor as defined in claim 3, wherein: the cross sections of all parts of the injection pipe (1) are non-circular.

5. The eductor as defined in claim 4, wherein: the cross section of the throat (111) is oval, and the projection of the center of the nozzle (211) towards the throat (111) along the center line of the injection pipe (1) falls on the long axis of the oval.

6. The eductor as defined in claim 5, wherein: the number of the nozzles (21) is two, the size H2 of the long axis of the throat (111) is 14-16 mm, the size H1 of the short axis is 9-11 mm, and the distance H between the centers of the two nozzles (211) on the long axis of the throat (111) is 5-8 mm.

7. The eductor as defined in claim 5, wherein: the number of the nozzles (21) is three, the size H4 of the long axis of the throat (111) is 14-22 mm, the size H3 of the short axis is 9-11 mm, and the distance H5 between the centers of two adjacent nozzles (211) on the long axis of the throat (111) is 4-8 mm.

8. The eductor as defined in claim 1, wherein: along the airflow flow path, the nozzle (21) is positioned at the upstream of the air inlet end (1a) of the injection pipe (1), and the nozzle (211) of the nozzle (21) faces the air inlet end (1a) of the injection pipe (1) and is spaced from the air inlet end (1a) by a distance (d).

9. The eductor as defined in claim 1, wherein: the nozzle seat (2) comprises a main pipe section (2a) extending along the flowing direction of the airflow, an air outlet section (2b) is arranged at the tail end of the main pipe section (2a), and the nozzle (21) is arranged on the tail end face of the air outlet section (2 b).

10. The eductor as defined in claim 9, wherein: the central line of the main pipe section (2a) is basically coincident with or parallel to the central line of the injection pipe (1).