CN214791089U - Ejector for stove burner and stove burner - Google Patents

Abstract

The utility model relates to an ejector for a stove burner and the stove burner, wherein, the ejector for the stove burner comprises an ejector pipe, the ejector pipe comprises a contraction section and an air inlet, and the cross section area of the ejector pipe is gradually reduced from the air inlet along the airflow flowing direction; a mixing section downstream of the convergent section in the direction of flow of the gas stream; at least one extending piece which is positioned in the inner cavity of the mixing section, extends along the length direction of the mixing section and divides the inner cavity of the mixing section into at least two flow passages; the method is characterized in that: the extension piece is provided with an expansion section which gradually expands outwards along the airflow flowing direction, the expansion section is arranged adjacent to the air inlet, and the outer side surface of the expansion section facing the corresponding side flow passage is a flow guide surface which gradually inclines outwards along the airflow flowing direction. Make two strands of mixed air flows enter into the runner that corresponds the side respectively, reduce the mixed air flow and flow back to the possibility of air intake department, reduced the kinetic energy loss.

Description

Ejector for stove burner and stove burner

Technical Field

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

Background

The gas-cooker is the common kitchen utensils and appliances in people's daily life, the combustor is the important part of gas-cooker, current cooking utensils combustor generally all includes the base, the furnace end and install the inner ring fire lid on the furnace end, outer ring fire lid, set up two annular chambers on the base, be inner ring annular chamber and outer lane annular chamber respectively promptly, install inner ring fire lid on inner ring annular chamber, outer ring fire lid on outer lane annular chamber, inner ring annular chamber and outer lane annular chamber are equivalent to the gas-mixing chamber, need fully mix gas, when the combustor during operation, form inner ring fire and outer lane fire respectively on inner ring fire lid and outer ring fire lid.

The ejector is an important part of the gas stove and has the following functions: 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.

As for a multi-channel gas cooker ejector, a burner and a gas cooker in the Chinese utility model patent, the patent number 201721534378.5 (publication number CN207635341U) discloses a multi-channel gas cooker ejector, which comprises at least two nozzles and an ejector pipe which are arranged in sequence along the gas flowing direction, wherein the nozzles are butted with the ejector pipe; the injection pipe comprises a suction contraction pipe, a mixing pipe and a diffuser pipe which are sequentially connected according to cross section changes along the airflow direction, the mixing pipe comprises sub-mixing pipes with the same number of nozzles, each nozzle corresponds to one sub-mixing pipe, the mixing pipe of the injection pipe is divided into a plurality of sub-mixing pipes, each nozzle corresponds to one sub-mixing pipe, gas and primary air are prevented from being converged in different directions and colliding with each other, the primary air and the gas are mixed more uniformly, the injection capacity is improved, however, when the mixed airflow enters the sub-mixing pipes, the backflow condition can occur, and kinetic energy loss is caused.

Accordingly, further improvements to existing ejectors are needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the first technical problem to provide a reduce the ejector for cooking utensils combustor that flows back in order to reach and reduce kinetic energy loss purpose to the current situation of above-mentioned prior art.

The utility model aims to solve the second technical problem that a cooking utensils combustor for improving combustion efficiency is provided.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: an ejector for a stove burner comprises an ejector pipe, wherein the ejector pipe comprises

A contraction section having an air inlet, a cross-sectional area of which is gradually reduced from the air inlet along an air flow direction;

a mixing section downstream of the convergent section in the direction of flow of the gas stream;

at least one extending piece which is positioned in the inner cavity of the mixing section, extends along the length direction of the mixing section and divides the inner cavity of the mixing section into at least two flow passages;

the method is characterized in that: the extension piece is provided with an expansion section which gradually expands outwards along the airflow flowing direction, the expansion section is arranged adjacent to the air inlet, and the outer side surface of the expansion section facing the corresponding side flow passage is a flow guide surface which gradually inclines outwards along the airflow flowing direction.

In order to guide the mixed airflow, the two flow guide surfaces are in smooth transition, and the connecting part between the flow guide surface and the inner wall of the mixing section is in smooth transition.

In order to improve ejection, the cross sections of all parts of the ejection pipe are elliptical.

One of the structural forms of the extension piece: the extension piece is a partition plate and divides an inner cavity of the mixing section into two independent and non-communicated flow passages. So, avoid gas and primary air to be by the confluence of equidirectional and striking each other, improve the mixing ability.

Preferably, the partition plate is substantially perpendicular to the long axis of the cross section of the ejector tube.

In order to improve the turbulence at the rear end of the extension piece, a notch is formed in the first side edge of the partition plate, which is far away from one side of the expansion section, and the notch is formed in the position, close to the center, of the first side edge.

The second structure form of the extending piece: the extension piece is the extension strip, the extension strip has two, and along draw the minor axis direction interval arrangement of the cross section of penetrating the pipe.

In order to increase the introduction of air, two nozzles are arranged at the position of the contraction section adjacent to the air inlet, and the extension piece is positioned between the center lines of the nozzles of the two nozzles. Therefore, the fuel gas sprayed by the two nozzles is not interfered with each other, more air can be sucked, and the injection capacity is improved.

Preferably, the distance between the extension and the centre line of each of the jets is equal.

Preferably, the distance between the centers of the two nozzle spouts is X, the distance between the nozzle and the extension piece is Y, and the distance Y satisfies: 150/X < Y < 250/X. When the distance Y is too large, the mixing of the two air flows can be influenced, and the ejection capacity can be influenced when the distance Y is too small.

The utility model provides a technical scheme that above-mentioned second technical problem adopted does: the utility model provides a cooking utensils combustor with foretell ejector which characterized in that: the injection tube is characterized by comprising a base, wherein a cavity which is annular and has an open top is arranged on the base, a fire cover covers the open top of the cavity, a gas mixing chamber is formed by enclosing the fire cover and the base, and the injection tube is communicated with the gas mixing chamber in a fluid mode.

Compared with the prior art, the utility model has the advantages of: the existence of expansion section and water conservancy diversion face on this ejector's the extension, can lead the air current to the runner of corresponding side in for two strands of air current enter into respectively to the runner of corresponding side in, reduce the possibility that the air current flows back to air intake department, reduced the kinetic energy loss.

Drawings

Fig. 1 is a schematic structural view of an ejector according to the first embodiment;

FIG. 2 is a schematic view of the structure of FIG. 1 from another angle;

FIG. 3 is a cross-sectional view of FIG. 1;

FIG. 4 is a schematic view of the structure of FIG. 3 at another angle;

FIG. 5 is a cross-sectional view at another angle of FIG. 1;

FIG. 6 is a schematic structural view of the ejector tube of FIG. 1;

FIG. 7 is a sectional view of the second embodiment;

FIG. 8 is a schematic structural diagram of a third embodiment;

FIG. 9 is a cross-sectional view of FIG. 8;

FIG. 10 is a schematic structural view of a burner according to the first embodiment;

FIG. 11 is a cross-sectional view of FIG. 10;

FIG. 12 is a graph showing a simulation of the flow rate in the ejector tube of FIG. 10;

FIG. 13 is an enlarged view of a portion of FIG. 12;

FIG. 14 is a flow simulation diagram in an ejector tube in the background art;

fig. 15 is a partially enlarged view of fig. 14.

Detailed Description

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

The first embodiment is as follows:

as shown in fig. 1 to 6 and fig. 10 and 11, it is a first preferred embodiment of the present invention.

As shown in fig. 10 and 11, the stove burner of the present embodiment includes a base 41, a cavity 411 having an annular shape and an open top is formed on the base 41, a fire cover 42 covers the open top of the cavity 411, and a gas mixing chamber 43 is formed between the fire cover 42 and the base 41.

As shown in fig. 1 to 6, the ejector of the present embodiment includes an ejector pipe 1, an extension member, and a nozzle 3, where the ejector pipe 1 is in fluid communication with the gas mixing chamber 43, the ejector pipe 1 may be an outer ring ejector pipe or an inner ring ejector pipe, and the ejector pipe 1 in the present embodiment is an inner ring ejector pipe.

As shown in fig. 6, the cross section of each part of the injection pipe 1 is oval, the injection pipe 1 sequentially comprises a contraction section 11, a mixing section 12 and a diffusion section 13 along the airflow flowing direction, the contraction section 11 is provided with an air inlet 111, and the cross section area of the contraction section 11 is gradually reduced from the air inlet 111 along the airflow flowing direction; the mixing section 12 has equal cross-sectional area everywhere along the airflow direction; the diffuser section 13 has a gradually increasing cross-sectional area along the direction of gas flow.

As shown in fig. 2 to 6, the extending part is a partition plate 21 located in the inner cavity of the mixing section 12 and extending along the length direction of the mixing section 12, the partition plate 21 partially extends into the diffuser section 13, and the partition plate 21 is substantially perpendicular to the long axis of the cross section of the ejector pipe 1. In addition, the partition plate 21 divides the inner cavity of the mixing section 12 into two flow passages 100 which are independent from each other and are not communicated with each other. The extension piece has an expanding section 200 gradually expanding outwards along the airflow flowing direction, the expanding section 200 is arranged adjacent to the air inlet, and the outer side surface of the expanding section 200 facing the corresponding side flow passage 100 is a flow guide surface 201 gradually inclining outwards along the airflow flowing direction. The two guide surfaces 201 are in smooth transition, and the connection between the guide surfaces 201 and the inner wall of the mixing section 12 is in smooth transition.

As shown in fig. 2 to 5, the nozzle 3 is disposed at a position adjacent to the air inlet 111 of the constricted section 11 through the nozzle holder 5, and the nozzle holder 5 is provided with a mounting bracket 51 attached to the outer peripheral wall of the constricted section 11, as shown in fig. 10 and 11. A space is left between the nozzle 3 and the air inlet 111. The number of the nozzles 3 in this embodiment is two, and the partition plates are located between the center lines A of the nozzle orifices of the two nozzles 3 and are equally spaced from the center lines A of the respective nozzle orifices. Specifically, as shown in fig. 5, the distance between the centers of the nozzles of the two nozzles 3 is X, the distance between the nozzle 3 and the extension member is Y, and the distance Y satisfies: 150/X < Y < 250/X.

As shown in fig. 14 and 15, only the extension member is provided, and a part of the mixed gas flow has backflow, so that kinetic energy loss is caused, and the ejection capability is also affected. As shown in fig. 12 and 13, the existence of the expansion section and the flow guide surface can guide the two mixed air flows into the flow channel on the corresponding side respectively, so that the two mixed air flows enter the flow channel on the corresponding side respectively, the possibility that the mixed air flows flow back to the air inlet is reduced, and the kinetic energy loss is reduced.

Example two:

fig. 7 shows a second preferred embodiment of the present invention.

The present embodiment is different from the first embodiment only in that: the partition plate 21 has a notch 211 formed on a first side 21a on a side away from the expansion section 200, the first side 21a is disposed adjacent to the diffuser section 13, and the notch 211 is formed on a position of the first side 21a adjacent to the center. The notch 211 in this embodiment is V-shaped, and the opening of the notch 211 gradually increases along the airflow flowing direction, so that the existence of the notch 211 slows down the turbulence at the rear end of the partition plate 21.

Example three:

as shown in fig. 8 and 9, it is a third preferred embodiment of the present invention. This embodiment differs from the first embodiment only in that: the extending pieces are extending strips 22, and two extending strips 22 are arranged at intervals along the short axis direction of the cross section of the injection pipe 1. The extension strip 22 in this embodiment also has the above-mentioned expansion section 200 and the diversion surface 201.

The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter collectively referred to as a first portion and a second portion), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion or/and be transported to the second portion, and may be directly communicated between the first portion and the second portion, or indirectly communicated between the first portion and the second portion via at least one third member, which may be a fluid passage such as a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber allowing the fluid to flow therethrough, or a combination thereof.

Claims (11)

1. An ejector for a stove burner comprises an ejector pipe (1), wherein the ejector pipe (1) comprises

A convergent section (11) having an air inlet (111) and having a cross-sectional area gradually decreasing from the air inlet (111) in an air flow direction;

a mixing section (12) located downstream of the constriction section (11) in the direction of flow of the gas stream;

at least one extension located in the inner cavity of the mixing section (12) and extending in the length direction of the mixing section (12) and dividing the inner cavity of the mixing section (12) into at least two flow channels (100);

the method is characterized in that: the extension piece is provided with an expansion section (200) which gradually expands outwards along the airflow flowing direction, the expansion section (200) is arranged adjacent to the air inlet (111), and the outer side surface of the expansion section (200) facing the corresponding side flow channel (100) is a flow guide surface (201) which gradually inclines outwards along the airflow flowing direction.

2. The eductor as defined in claim 1, wherein: the two flow guide surfaces (201) are in smooth transition, and the connecting part between the flow guide surface (201) and the inner wall of the mixing section (12) is in smooth transition.

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

4. The eductor as defined in claim 3, wherein: the extension piece is a partition plate (21), and an inner cavity of the mixing section (12) is partitioned to form two independent and non-communicated flow channels (100).

5. The eductor as defined in claim 4, wherein: the partition plate (21) is substantially perpendicular to the long axis of the cross section of the injection pipe (1).

6. The eductor as defined in claim 5, wherein: a notch (211) is formed in a first side edge (21a) of the partition plate (21) far away from one side of the expansion section (200), and the notch (211) is formed in the position, close to the center, of the first side edge (21 a).

7. The eductor as defined in claim 3, wherein: the extension piece is extension strip (22), and there are two extension strips (22), and along the injection pipe (1) the minor axis direction of cross section is at interval arrangement.

8. The eductor as defined in any one of claims 1 to 7 wherein: and two nozzles (3) are arranged at the position of the contraction section (11) adjacent to the air inlet, and the extension piece is positioned between the central lines (A) of the nozzles of the two nozzles (3).

9. The eductor as defined in claim 8, wherein: the distance between the extension and the central line (A) of each spout is equal.

10. The eductor as defined in claim 8, wherein: the distance between the centers of the spouts of the two nozzles (3) is X, the distance between the nozzle (3) and the extension piece is Y, and the distance Y satisfies the following conditions: 150/X < Y < 250/X.

11. A cooktop burner with the injector of any one of claims 1 to 10, characterized in that: including base (41), have on base (41) and be annular and open-top cavity (411), the open-top department in top of cavity (411) covers has fire lid (42), fire lid (42) with it has gas mixing chamber (43) to enclose between base (41), draw injection pipe (1) with gas mixing chamber (43) looks fluid intercommunication.

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