A burner ejector assembly and a gas stove using the same

Abstract

The present application relates to a kind of burner ejector assembly and the gas stove of application with the ejector assembly, the burner ejector assembly includes ejector pipe, with gas inlet end and throat mouth;Gas inlet seat, with gas flow outlet, gas flow outlet and gas inlet end are opposite, in the direction of gas flow, gas flow outlet is located in the upstream of gas inlet end;Ejector assembly is horizontally installed, the intersection of the horizontal plane where the center of gas flow outlet is and the throat mouth forms center line, the shape surrounded by the profile line of throat mouth cross section, the part above center line is S1, the part below center line is S2, and satisfy S1>S2.Compared with prior art, the advantages of the present application are that: in the upper part of gas and air less, provide larger flow area, increase the gas flow of gas and air into mixing section, and then the gas in the mixing section, the gas flow of upper and lower two parts can reach balance, so as to promote the uniformity of mixing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household kitchen utensils, in particular to a burner injection assembly and a gas stove applying the same. BACKGROUND

[0002] Currently, there are mainly two kinds of gas burners used in kitchen utensils, one of which is an injection type gas burner, which generally comprises a fire cover, an injection pipe and a nozzle. The injection pipe is provided with a first air inlet at one end corresponding to the nozzle. The injection pipe is in communication with the outside atmosphere through the first air inlet. The gas is injected into the injection pipe at high speed from the nozzle, forming strong injection in the injection pipe. The outside air is sucked into the injection pipe from the air inlet, and after mixing with the gas in the injection pipe, it is sent to the fire cover for combustion.

[0003] The advantages of this kind of burner are simple and compact structure, good effect of primary air injection, but also have some shortcomings, which requires higher gas supply pressure. Since the gas is ejected from the nozzle with small aperture, the jet enters the injection pipe at a very high speed, and under the turbulent diffusion of the jet, part of the surrounding air is sucked into the injection pipe. The existing injection pipe, such as the Chinese patent with patent number ZL201420180488.6 (authorized publication number CN203784951U) or patent number ZL201520363021.X (authorized publication CN204717683U), the inner cavity of the injection pipe is sequentially provided with a contraction section, a mixing section and an expansion section along the direction from the inlet to the outlet.

[0004] Since this kind of injection pipe is usually symmetrical structure (symmetrical with respect to the upper and lower sides of the horizontal plane where the nozzle center is located), however, when the burner is working, the air in the stove shell is heated, resulting in high ambient temperature, and the temperature increases more obviously as it approaches the burner. When the temperature is high, the gas ejected from the nozzle is rapidly heated, the volume rapidly increases, the density decreases, and the influence of buoyancy on the direction of gas injection cannot be ignored. The trajectory of the jet will be inclined upward to some extent, so that the air injection amount of the air below the horizontal plane where the nozzle center is located increases (the space for natural injection of air increases), while the air injection amount of the air above the horizontal plane where the nozzle center is located decreases (the space for natural injection of air decreases). In addition, the outside air naturally injected also has the tendency to float upward after being rapidly heated, further reducing the air above the horizontal plane where the nozzle center is located. Therefore, the mixed gas of the gas ejected from the nozzle and the outside air naturally injected into the injection pipe has the state that the gas flow above the horizontal plane where the nozzle center is located is less than the gas flow below the horizontal plane where the nozzle center is located, which will lead to uneven mixing, reduced injection efficiency, and even insufficient combustion. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide a burner injection assembly which can make the injection gas mix uniformly, improve the injection efficiency, and thus make the combustion sufficient.

[0006] The second technical problem to be solved by the present application is to provide a gas stove applying the above burner injection assembly.

[0007] The technical solution adopted by the present application to solve the above first technical problem is a burner injection assembly, which comprises

[0008] The injection pipe has a gas inlet end and a throat;

[0009] The gas inlet seat has a gas flow outlet, and the gas flow outlet and the gas inlet end are opposite to each other, and the gas flow outlet is located upstream of the gas inlet end in the gas flow direction;

[0010] Characterized in that:

[0011] The injection assembly is horizontally installed, the intersection of the center of the gas flow outlet and the throat forms a center line, and the shape surrounded by the profile line of the cross section of the throat is divided into two parts above and below the center line, the flow area of the part above the center line is S1, and the flow area of the part below the center line is S2, and S1>S2 is satisfied.

[0012] By making the flow area of the part above the center line of the throat larger than the flow area of the part below the center line, the flow area of the upper part is expanded, even if there is the problem of uneven gas inlet caused by gas floating and air floating, the gas and injection air can enter the injection pipe, and when reaching the throat, a larger flow area is provided in the upper part where the gas and air are less, the gas flow into the mixing section is increased, and thus the gas flow into the mixing section can be balanced with respect to the plane where the center of the gas flow outlet is located, thereby promoting the uniformity of mixing, improving the injection efficiency, and thus making the combustion sufficient.

[0013] Preferably, in order to further make the upper and lower parts of the inlet uniform, the value range of S1:S2 is ≤1.45:.

[0014] Further, in order to expand the flow area of the upper part, the profile line of the cross section of the throat has at least one first protruding part above the center line, and the first protruding part is in the shape of upward protruding away from the center line.

[0015] In order to improve the gas injection capacity, the number of gas flow outlets corresponding to the same injection pipe is at least two, and the centers of each gas flow outlet are on the same horizontal plane.

[0016] Further, the profile line of the throat cross section has at least one second protruding part formed at the portion below the center line, the second protruding part is in the shape of upward protruding towards the center line, and the second protruding part is formed at the position corresponding to the adjacent two gas flow outlets. Thus, the influence of the increased air entrainment caused by the superposition of the negative pressure zones formed by the gas flow from the adjacent two gas flow outlets is reduced, and the air intake is made more uniform.

[0017] Further, in order to expand the flow area of the upper part and avoid the height of the ejector being too large, the number of gas flow outlets corresponding to the same ejector is two, and the profile line of the throat cross section has a first protruding part at the portion above the center line, the first protruding part is in the shape of upward protruding away from the center line.

[0018] The vertical distance from the highest point of the first protruding part to the center line is D1, the vertical distance from the highest point of the second protruding part to the center line is D2, and the range of D1:D2 is 1.25:1-2.15:1.

[0019] Further, the profile line of the throat cross section is symmetrical with respect to the axis at the portion on both sides of the axis, and thus the air flow on both sides is uniform.

[0020] Further, the profile line of the throat cross section has at least one first protruding part at the portion above the center line, the first protruding part is in the shape of upward protruding away from the center line, and / or the profile line of the throat has at least one second protruding part formed at the portion below the center line, the second protruding part is in the shape of upward protruding towards the center line.

[0021] The ejector includes a contraction section, a mixing section and a diffuser section arranged in sequence along the air flow direction, the throat is formed at the junction of the contraction section and the mixing section, and the contraction section has a first transition structure corresponding to the first protruding part and / or the second protruding part of the throat, the first transition structure gradually protrudes from the air inlet end to the throat, and thus the air flow can be gradually guided to the protruding part through the first transition structure, and the air flow impact caused by the sudden change of the flow channel is reduced.

[0022] Further, the profile line of the throat cross section has at least one first protruding part at the portion above the center line, the first protruding part is in the shape of upward protruding away from the center line, and / or the profile line of the throat cross section has at least one second protruding part formed at the portion below the center line, the second protruding part is in the shape of upward protruding towards the center line.

[0023] The ejector pipe comprises a contraction section, a mixing section and an expansion section arranged in sequence along the airflow direction, the throat is formed at the junction of the contraction section and the mixing section, and the mixing section is formed with a second transition structure corresponding to the first and / or second protruding portions of the throat, which can further promote the uniform mixing of the airflow in the mixing section.

[0024] The present application solves the second technical problem by using a gas stove with the burner ejector assembly as described above.

[0025] Compared with the prior art, the present application has the advantages that by making the flow area of the portion above the center line larger than that of the portion below the center line, the flow area of the upper portion is expanded, even if there is the problem of uneven intake of gas and air caused by gas floating and air floating, the gas and the ejecting air can enter the ejector pipe, and when reaching the throat, a larger flow area is provided in the upper portion where the gas and air are less, the gas flow into the mixing section is increased, and the gas entering the mixing section can be balanced in terms of the plane where the center of the gas flow outlet is, thereby promoting the uniformity of mixing, improving the ejecting efficiency, and further making the combustion sufficient. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a structural schematic diagram of a burner ejector assembly according to the first embodiment of the present application;

[0027] Figure 2 FIG. 2 is a schematic diagram of an ejector pipe of the burner ejector assembly according to the first embodiment of the present application;

[0028] Figure 3 FIG. 3 is a cross-sectional schematic diagram of a throat of the ejector pipe of the burner ejector assembly according to the first embodiment of the present application;

[0029] Figure 4 FIG. 4 is a schematic diagram of an air inlet seat of the burner ejector assembly according to the first embodiment of the present application;

[0030] Figure 5 FIG. 5 is a cross-sectional schematic diagram of a throat of an ejector pipe of a burner ejector assembly according to the second embodiment of the present application;

[0031] Figure 6 FIG. 6 is a cross-sectional schematic diagram of a throat of an ejector pipe of a burner ejector assembly according to the third embodiment of the present application;

[0032] Figure 7 FIG. 7 is a cross-sectional schematic diagram of a throat of an ejector pipe of a burner ejector assembly according to the fourth embodiment of the present application. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein like reference numerals refer to like elements or elements with similar functions throughout the figures. The description of the embodiments is intended to apply to all alternative embodiments, unless otherwise indicated.

[0034] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, since the disclosed embodiments of the present application can be arranged in different directions, so these orientation-indicating terms are only illustrative and should not be regarded as limiting, such as "upper", "lower" do not necessarily mean the direction opposite or consistent with the direction of gravity. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more of the features.

[0035] Embodiment one

[0036] Referring to Figures 1-4 , the first embodiment of the present application. The burner injection assembly of the present embodiment comprises an injection pipe 1 and an air inlet seat 2.

[0037] The injection pipe 1 of the present embodiment comprises, in order along the airflow direction according to the change of the cross section, a converging section 11, a mixing section 12 and a diffuser section 13, wherein the junction of the converging section 11 and the mixing section 12 forms a throat 14. The port of the converging section 11 away from the mixing section 12 is configured as an air inlet end 111, and the air inlet seat 1 is formed with a gas flow outlet 21, which is opposite to the air inlet end 111. In the installed state, the gas flow outlet 21 and the injection pipe 1 are horizontally installed, and the horizontal plane in which the center of the gas flow outlet 21 is located divides the gas flow outlet 21 into symmetric upper and lower parts, Figure 3 The horizontal straight line (center line X) in the above formula is the intersection line of the horizontal plane in which the center of the gas flow outlet 21 is located and the plane of the throat 14.

[0038] The cross section of the throat 14 is Figure 2The shape surrounded by the contour lines of the cross section (there are two contour lines in the figure, which are spaced apart inside and outside, because the injection pipe 1 has a certain wall thickness, and the contour lines described below are all the contour lines on the inside) of the cross section formed by the left-right vertical cross section shown in the figure, the over-flow area of the part above the center line X is S1, the over-flow area of the part below the center line X is S2, and S1>S2 is satisfied. That is, the over-flow area of the part above the center line X is larger than the over-flow area of the part below the center line X, so that the over-flow area of the upper part is enlarged relative to the symmetrical injection pipe structure, and even if there is a problem of uneven intake caused by gas floating and air floating, the gas and injection air can enter the injection pipe 1 and reach the throat 14, and a larger over-flow area is provided in the upper part where there is less gas and air, so that the gas flow into the mixing section 12 is increased, and the gas entering the mixing section 12 can be balanced in the upper and lower parts relative to the plane where the center of the gas flow outlet 21 is located, so that the uniformity of mixing is improved, and the combustion is sufficient. Preferably, the range of S1:S2 is ≤1.45.

[0039] In the present embodiment, in order to facilitate the formation of S1>S2, the contour line of the cross section of the throat 14 has at least one first protruding portion 141, which is in the shape of protruding upward in the direction away from the center line X. Corresponding to each injection pipe 1, the number of gas flow outlets 21 can be at least two, so as to solve the problem of insufficient natural injection of air outside a single gas flow outlet 21. The centers of the gas flow outlets 21 are in the same horizontal plane, that is, the gas flow outlets 21 are arranged in a spaced apart manner in the horizontal direction. In the present embodiment, the gas flow outlet 21 has two.

[0040] When at least two gas flow outlets 21 are provided, the negative pressure zones formed by the two gas flow outlets 21 are superimposed in the region between the two gas flow outlets 21, and thus the contour line of the cross section of the throat 14 has at least one second protruding portion 142, which is in the shape of protruding upward in the direction close to the center line X, and the second protruding portion 142 is formed at a position corresponding to between the adjacent two gas flow outlets 21, so as to reduce the influence of the increase of injection air caused by the superposition of negative pressure zones, and reduce the uneven intake.

[0041] The vertical distance from the highest point of the first protruding portion 141 to the center line X is D1, and the vertical distance from the highest point of the second protruding portion 142 to the center line X is D2, and the range of D1:D2 is 1.25:1-2.15:1.

[0042] Reference is made to Figure 3In this embodiment, the outline of the throat 14 cross-section is preferably formed by several circles or ellipses (in this embodiment, two circles with equal radii, such as...). Figure 3 The two points where the center line X intersects with the outline of the throat 14 cross section are two points where two circles are far apart. The centers O1 and O2 of the two circles are located on the center line X. The part below the center line X is the non-intersecting part of the two circles, and a chamfer is formed at the intersection point. The chamfer position is the second protrusion 142 mentioned above. The part above the center line X is formed by connecting the points of each non-intersecting part of each circle with an arc and the line segments of the two circles on both sides of the arc. The arc connecting the two circles constitutes the first protrusion 141 mentioned above. Preferably, the vertical line passing through the center line X and located at the center between the two intersection points of the outline and the center line is taken as the axis Y. The axis Y is perpendicular to the center line X. The part of the outline of the throat 14 cross section located on both sides of the axis Y is symmetrical with respect to the axis Y. The intersection point of the two circles is located on the axis Y.

[0043] Within the contraction section 11, a first transition structure 112 is formed gradually from the air inlet end 111 towards the mixing section 12, corresponding to the first protrusion 141 and the second protrusion 142 of the throat 14. Within the mixing section 12, a second transition structure 121 is formed, corresponding to the first protrusion 141 and the second protrusion 142 of the throat 14.

[0044] Example 2

[0045] See Figure 5 In this embodiment, unlike the above embodiment, the second protrusion 142 may not be provided. The outline of the throat 14 cross section is formed by connecting each non-intersecting point of each circle below the center line X with a straight line and the line segments of the two circles on both sides of the arc, as long as S1 > S2 is ensured.

[0046] Example 3

[0047] See Figure 6 In this embodiment, the difference from the first embodiment is that the outline of the throat 14 cross section, the part below the center line X, is formed by taking a point on each non-intersecting part of each circle and connecting it with an upwardly convex arc and the line segments of the two circles on both sides of the arc, as long as S1>S2 is ensured.

[0048] Example 4

[0049] See Figure 7In this embodiment, the difference from the above-mentioned embodiment one is that the contour line of the throat 14 cross section has two second protruding parts 142 arranged on the left and right sides, thereby being able to adapt to the structure of the three gas flow outlets 112. Optionally, the second protruding parts 142 can also be arranged in this way in a larger number.

Claims

1. A burner-ejector assembly comprising an ejector pipe (1) having an inlet end (111) and a throat (14); an inlet seat (2) having gas flow outlets (21) opposite the inlet end (111) and upstream of the inlet end (111) in the direction of gas flow; characterized in that: the ejector assembly is horizontally installed, a horizontal plane where the centers of the gas flow outlets (21) are located intersects the throat (14) to form a center line (X), the shape enclosed by the profile line of the cross section of the throat (14) has a part above the center line (X) with a flow area S1 and a part below the center line (X) with a flow area S2, and S1 > S2 is satisfied; the profile line of the cross section of the throat (14) has at least one first convex part (141) above the center line (X), the first convex part (141) is convex upward in a direction away from the center line (X); the profile line of the cross section of the throat (14) has at least one second convex part (142) below the center line (X), the second convex part (142) is convex upward in a direction close to the center line (X).

2. The combustor-ejector assembly of claim 1, wherein The value range of S1:S2 is ≤1.

45.

3. The combustor-ejector assembly of claim 1, wherein: The number of gas flow outlets (21) corresponding to the same ejector pipe (1) is at least two, and the centers of each gas flow outlet (21) are on the same horizontal plane.

4. The combustor-ejector assembly of claim 3, wherein: The profile line of the cross section of the throat (14) has at least one second convex part (142) below the center line (X), the second convex part (142) is convex upward in a direction close to the center line (X), and the second convex part (142) is formed at a position corresponding to between adjacent two gas flow outlets (21).

5. The combustor-ejector assembly of claim 4, wherein: The number of gas flow outlets (21) corresponding to the same ejector pipe (1) is two, the profile line of the cross section of the throat (14) has one first convex part (141) above the center line (X), the first convex part (141) is convex upward in a direction away from the center line (X); The vertical distance from the highest point of the first convex part (141) to the center line (X) is D1, the vertical distance from the highest point of the second convex part (142) to the center line (X) is D2, and the range of D1:D2 is 1.25:1~2.15:

1.

6. The combustor-ejector assembly of claim 1, wherein: Taking a vertical line through the center of the two intersection points of the center line (X) and the profile line as an axis (Y), the axis (Y) is perpendicular to the center line (X), and the parts of the profile line of the cross section of the throat (14) on both sides of the axis (Y) are symmetrical relative to the axis (Y).

7. The combustor-ejector assembly of claim 1, wherein: The contour line of the throat (14) cross section has at least one first convex portion (141) in the portion above the center line (X), which is convex upward in the direction away from the center line (X); and / or the contour line of the throat (14) cross section has at least one second convex portion (142) in the portion below the center line (X), which is convex upward in the direction close to the center line (X); The ejector pipe (1) comprises a contraction section (11), a mixing section (12) and a diffuser section (13) arranged in sequence along the airflow direction, the throat (14) is formed at the junction of the contraction section (11) and the mixing section (12), and the contraction section (11) is formed with a first transition structure (112) corresponding to the first convex portion (141) and / or the second convex portion (142) of the throat (14), which gradually protrudes from the gas inlet end (111) to the throat (14).

8. The combustor-ejector assembly of claim 1, wherein: The contour line of the throat (14) cross section has at least one first convex portion (141) in the portion above the center line (X), which is convex upward in the direction away from the center line (X); and / or the contour line of the throat (14) cross section has at least one second convex portion (142) in the portion below the center line (X), which is convex upward in the direction close to the center line (X); The ejector pipe (1) comprises a contraction section (11), a mixing section (12) and a diffuser section (13) arranged in sequence along the airflow direction, the throat (14) is formed at the junction of the contraction section (11) and the mixing section (12), and the mixing section (12) is formed with a second transition structure (121) corresponding to the first convex portion (141) and / or the second convex portion (142) of the throat (14).

9. A gas hob, characterized in that: A gas stove using the burner ejector assembly according to any one of claims 1-8.

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