An ejector tube for a gas stove

Abstract

The present invention relates to an ejector tube for a gas stove, comprising an air inlet end and an ejector arranged corresponding to the air inlet end, wherein the ejector has at least two ejectors, and the ejector is characterized in that: corresponding to two adjacent ejectors in the ejector, at least two parallel guide vanes are arranged in the air inlet end of the ejector tube, the two guide vanes are perpendicular to the plane where the axis of the ejector is located, and are located between the plane and the peripheral wall of the corresponding ejector tube. Compared with the prior art, the advantage of the present invention is that the guide vanes are located above the respective ejectors, so that when two high-speed airflows located above the ejectors intersect, the airflow velocity of the mixed gas decreases rapidly due to the obvious momentum loss of the guide member, while at this time, the airflow below it does not pass through the guide vane, and its velocity does not change much, so that the upper and lower layers of airflow have a velocity difference, so that the upper and lower layers of airflow begin to be disturbed, so that the gas and primary air are further mixed.

Description

Technical Field

[0001] The invention relates to the field of gas stoves, and in particular to an ejector tube. Background Art

[0002] The core of improving the energy efficiency of atmospheric burners is to increase the primary air coefficient and enhance the ejection capacity. So how to improve the primary coefficient of atmospheric burners? Technicians have made many improvements to the structure and setting of the ejector tube. For example, the Chinese utility model "Ejector for Burner Head of Gas Appliance" with the authorization announcement number CN202392805U discloses an ejector, including an outer ring nozzle, an inner ring nozzle, a damper air regulating plate, a damper fixing plate, a damper spring and a burner head. The damper air regulating plate, the damper fixing plate and the damper spring are respectively installed on the outer ring nozzle and the inner ring nozzle, and the outer ring nozzle and the inner ring nozzle are connected to the burner head. It is characterized in that: an air hole is provided on the circumferential surface of the rear end of the burner head ejector. Although the utility model sets an air hole at the rear end of the ejector to increase the primary air volume to a certain extent, since the air inlet trajectory of the air hole and the injection trajectory of the ejector nozzle are on mutually perpendicular planes, the air will interfere with the ejection of the gas by the nozzle when it enters the ejector tube from the air hole, and the ability of the air hole to increase air is also limited.

[0003] Traditional atmospheric burners generally use a single-nozzle ejector tube, and the ejection coefficient of a single nozzle is generally only about 0.45 to 0.65, and the flame length is uneven and weak. In order to increase the ejection capacity of the ejector tube, a burner with a multi-nozzle ejector tube has appeared on the market. However, since the cross-section of the bell mouth and roar mouth of the ejector tube is still the traditional circular, the ejection of this type of multi-nozzle ejector tube will interfere with each other at the initial stage, affecting the ejection efficiency. After the gas enters the ejector tube through the ejection, it cannot be fully mixed with the air entering the ejector tube, thereby affecting the primary air coefficient and further affecting the combustion efficiency of the burner. For this purpose, the applicant has disclosed a Chinese invention patent "A kind of ejector tube" with patent number ZL201310122553.X (authorization announcement number CN103234201B). The cross section of the cavity surrounded by the bell mouth of the ejector tube is formed by the intersection of a plurality of circles or a plurality of ellipses that are approximately circles. The centers of these circles or the centers of the ellipses are located on the same first circle and are evenly distributed relative to the center of the first circle. The nozzles adapted to the ejector tube are arranged at the center of the circle or the center, and the number of the nozzles is equal to the number of these circles or ellipses. The ejector tube can be adapted to multiple nozzles, which is different from a single nozzle. Compared with the nozzle ejector tube, the ejection capacity of the ejector tube can be enhanced. If the two nozzles adapted to the ejector tube need to be tilted to each other at a certain angle, the high-speed combustion gases ejected from the two nozzles can collide and mix, so that the injected air and combustion gases can be mixed more fully, thereby achieving higher thermal efficiency and lower CO emissions. However, the nozzle inclination angle required by this structure can hardly be guaranteed in actual processing. In fact, during processing, the center holes of the two nozzles are in a parallel state, which weakens the mixing effect and fails to achieve the efficient mixing represented by the double jets, so that the expected effect of performance improvement is not achieved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an ejector tube for a gas stove with strong ejection capability and good gas mixing effect in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: the ejector tube includes an air inlet end and an ejector arranged corresponding to the air inlet end, and the ejector has at least two ejectors, which is characterized in that: corresponding to two adjacent ejectors among the ejectors, at least two parallel guide plates are arranged in the air inlet end of the ejector tube, and the two guide plates are perpendicular to the plane where the axis of the ejector is located, and are located between the plane and the surrounding wall of the corresponding ejector tube.

[0006] Preferably, along the airflow direction, each of the guide vanes is located at a downstream position of the corresponding injector. When the two high-speed airflows above the injector meet, the airflow velocity of the mixed gas decreases rapidly due to the obvious momentum loss of the guide vane, while the airflow below it does not pass through the guide piece at this time, and its velocity does not change much, so the upper and lower layers of airflow produce a velocity difference, so that the upper and lower layers of airflow begin to disturb, so that the gas and primary air are further mixed, which is conducive to the full combustion of the gas, can improve thermal efficiency, and reduce the emission of waste gases such as CO in the flue gas.

[0007] Furthermore, each guide is located downstream of the corresponding ejector and is arranged at a certain interval d1, and the interval d1 satisfies: 1.2mm≤d2≤2.8mm. Too large or too small distance d1 is not conducive to the upper and lower airflow disturbances of the guide.

[0008] Furthermore, in order to achieve the goal of causing the guide member to produce an airflow difference between the upper and lower layers of airflow and generate disturbance, the injector has two, namely a first injector and a second injector, the guide plate is a part of the guide member, the guide member includes a first guide member located above the first injector and a second guide member located above the second injector, and the relationship between the distance D between the first guide member and the second guide member and the center distance d2 between the first injector and the second injector is: d2-10≤D≤d2+10.

[0009] The first flow guide member and the second flow guide member may be arranged parallel to each other or at a certain angle, and the angle α between the first flow guide member and the second flow guide member satisfies: 0≤α≤30°.

[0010] In order to prevent backfire, a backfire prevention cover is also included which is arranged on the end surface of the tube mouth corresponding to the air inlet end of the ejector tube, and the cross section of the backfire prevention cover is an inverted U shape.

[0011] In order to better achieve the connection between the anti-backfire hood and the guide piece, the U-shaped anti-backfire hood includes a horizontal portion, and the guide piece also includes a connecting rib connecting the root of the first guide piece and the root of the second guide piece, and the connecting rib is connected to the horizontal portion.

[0012] Furthermore, the distance d3 between the lowest end of the free end of the first guide and the central axis of the first injector satisfies: 0≤d3≤13mm. If the distance d3 is too large, it is not conducive to the high-speed airflow injection directions on both sides of the guide to start to move closer to the middle, and if it is too small, the guide cannot play a corresponding guiding role.

[0013] Furthermore, the distance d4 between the lowest end of the free end of the second guide and the central axis of the second injector satisfies: 0≤d4≤13mm. If the distance d4 is too large, it is not conducive to the high-speed airflow injection directions on both sides of the guide to start to move closer to the middle, and if it is too small, the guide cannot play a corresponding guiding role.

[0014] The guide member can have a variety of structures. Considering the simplicity of the structure, the first guide member and the second guide member are both plate-shaped, and the horizontal width of the first guide member and the second guide member is 3 to 12 mm. The closer the guide plate is to the injector, the more sensitive the performance is. The narrower the width of the guide member within a certain range, the better the effect and the more sensitive the performance is.

[0015] Compared with the prior art, the advantage of the present invention is that the guide vanes are located above the respective corresponding injectors, so that when the two high-speed airflows located above the injectors intersect, the airflow velocity of the mixed gas decreases rapidly due to the obvious momentum loss of the guide vanes, while the airflow below it does not pass through the guide member at this time, and its velocity does not change much, so that a velocity difference is generated between the upper and lower airflows, so that the upper and lower airflows begin to be disturbed, so that the fuel gas and the primary air are further mixed, which is beneficial to the full combustion of the fuel gas, can improve the thermal efficiency, and reduce the emission of waste gases such as CO in the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of an ejector adapted to the air inlet end of the ejector tube in Example 1 of the present invention;

[0017] Figure 2 for Figure 1 A cross-sectional view of

[0018] Figure 3 This is a schematic structural diagram of the anti-flashback cover in Example 1 of the present invention;

[0019] Figure 4 A cross-sectional view of an angle of the ejector tube as a whole in Example 1 of the present invention;

[0020] Figure 5 for Figure 4 Relative cross-sectional view.

[0021] Figure 6 Schematic diagram of the distribution of the ejector and the flow guide in Example 2 of the present invention;

[0022] Figure 7 Schematic diagram of the distribution of the injector and the guide member in Example 3 of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings.

[0024] Example 1

[0025] like Figures 1 to 5 As shown, this embodiment is the best embodiment of the present invention. The ejector tube 1 of this embodiment includes an air inlet end 11 and an ejector corresponding to the air inlet end 11, and the ejector has at least two ejectors, corresponding to two adjacent ejectors in the ejector, and at least two parallel guide vanes are arranged in the air inlet end 11 of the ejector tube 1, and the two guide vanes are perpendicular to the plane where the axis of the ejector is located, and are located between the plane and the peripheral wall of the corresponding ejector tube 1.

[0026] Preferably, along the airflow direction, each guide vane is located at a downstream position of the corresponding injector. Since the guide member is located above the injector and at a downstream position of the corresponding injector, when the two high-speed airflows above the injector intersect, the guide member will have obvious momentum loss, and the airflow velocity of the mixed gas will decrease rapidly. At this time, the airflow below it does not pass through the guide vane, and its speed does not change much. Therefore, a speed difference is generated between the upper and lower layers of airflow, so that the upper and lower layers of airflow begin to be disturbed, so that the fuel gas and the primary air are further mixed, which is beneficial to the full combustion of the fuel gas, can improve thermal efficiency, and reduce the emission of waste gases such as CO in the flue gas.

[0027] Furthermore, each guide vane is located at the downstream position of the corresponding ejector and is arranged at a certain interval d1, and the interval d1 satisfies: 1.2mm≤d2≤2.8mm. If the distance d1 is too large or too small, it is not conducive to the disturbance of the upper and lower layers of the airflow of the guide member. In order to achieve the guide member 4 so that the upper and lower layers of the airflow produce an airflow difference and generate disturbance, the ejector has two, namely the first ejector 2 and the second ejector 3, the guide vane is a part of the guide member, the guide member includes a first guide member 41 located on the first ejector 2 and a second guide member 42 located on the second ejector 3, and the relationship between the distance D between the first guide member 41 and the second guide member 42 and the center distance d2 of the first ejector 2 and the second ejector 3 is: d2-10≤D≤d2+10, wherein the first guide member 41 and the second guide member 42 can be arranged parallel to each other or at a certain angle, and the angle α between the first guide member 41 and the second guide member 42 satisfies: 0≤α≤30°.

[0028] Finally, in order to prevent backfire, a backfire protection cover 5 is also included, which is arranged on the end face 111 of the pipe mouth corresponding to the air inlet end 11 of the ejector pipe 1. The cross section of the backfire protection cover 5 is an inverted U-shape. In order to better realize the connection between the backfire protection cover 5 and the guide member 4, the U-shaped backfire protection cover 5 includes a horizontal portion 51. The guide member 4 also includes a connecting rib 43 connecting the root of the first guide member 41 and the root of the second guide member 42. The connecting rib 43 is connected to the horizontal portion 51. The distance d3 between the lowest end of the free end of the first guide member 41 of the guide member and the central axis of the first ejector 2 satisfies: 0≤d3≤13mm. If the distance d3 is too large, it is not conducive to the high-speed airflow injection direction on both sides of the guide member to start to approach the middle. If it is too small, the guide member will not play a corresponding guiding role. Similarly, the distance d4 between the lowest end of the free end of the second guide member 42 and the central axis of the second ejector 3 satisfies: 0≤d4≤13mm. If the distance d4 is too large, it is not conducive to the high-speed airflow jet directions on both sides of the guide piece to start to move closer to the middle. If the distance d4 is too small, the guide piece will not play a corresponding guiding role. The guide piece can have a variety of structures. Considering the simple structure, the first guide piece 41 and the second guide piece 42 are both plate-shaped, and the horizontal width of the first guide piece 41 and the second guide piece 42 is 3 to 12 mm. The closer the guide plate is to the ejector, the more sensitive the performance is. The narrower the width of the guide piece within a certain range, the better the effect and the more sensitive the performance. Since the guide piece is located above the ejector, when the two high-speed airflows located above the ejector meet, the guide piece will have obvious momentum loss, and the airflow velocity of the mixed gas will decrease rapidly. At this time, the airflow below it does not pass through the guide piece, and its velocity does not change much. Therefore, the upper and lower layers of airflow have a velocity difference, so that the upper and lower layers of airflow begin to disturb, so that the gas and primary air are further mixed, which is conducive to the full combustion of the gas, can improve thermal efficiency, and reduce the emission of waste gases such as CO in the flue gas.

[0029] Example 2

[0030] The structure is basically the same as that of the embodiment 1, except that: the ejector tube 1 of the embodiment includes an air inlet end 11 and three ejectors corresponding to the air inlet end 11, the three ejectors are a first ejector 2', a first ejector 3' and a third ejector 33', the first ejector 2', the first ejector 3' and the third ejector 33' are in a triangular shape, and a guide member 4 is provided between adjacent ejectors, such as Figure 6 shown.

[0031] Example 3

[0032] The structure is basically the same as that of the embodiment 1, except that: the ejector tube 1 of the embodiment includes an air inlet end 11 and five ejectors corresponding to the air inlet end 11, the five ejectors are a first ejector 2", a first ejector 3", a third ejector 33", a fourth ejector 34' and a fifth ejector 35', the first ejector 2", the first ejector 3", the third ejector 33', the fourth ejector 34' and the fifth ejector 35' are in a plum blossom shape, and a guide member 4 is provided between adjacent ejectors, such as Figure 7 shown.

Claims

1. An ejector tube for a gas stove, comprising an air inlet end (11) and an ejector (2, 3) arranged corresponding to the air inlet end (11), wherein there are at least two ejectors (2, 3), characterized in that: Corresponding to two adjacent ejectors (2, 3) among the ejectors (2, 3), at least two parallel guide vanes are arranged in the air inlet end (11) of the ejector tube (1), the guide vanes are parts of the guide members (41, 42), the two guide vanes are perpendicular to the plane where the axis of the ejectors (2, 3) is located, and are located between the plane and the peripheral wall of the corresponding ejector tube (1); along the air flow direction, each of the guide members (41, 42) is located at a downstream position of the corresponding ejector (2, 3); each of the guide vanes is located at a downstream position of the corresponding ejector (2, 3) and is arranged at a certain interval d1, and the interval d1 satisfies: 1.2mm≤d1≤2.8mm; and also includes an anti-flashback hood (5) arranged on the tube end face (111) corresponding to the air inlet end (11) of the ejector tube (1), and the cross section of the anti-flashback hood (5) is an inverted U-shape.

2. The ejector tube for a gas stove according to claim 1, characterized in that: The injectors (2, 3) have two, namely a first injector (2) and a second injector (3); the guide plate is a part of a guide member (41, 42); the guide member comprises a first guide member (41) located above the first injector (2) and a second guide member (42) located above the second injector (3); the relationship between a distance D between the first guide member (41) and the second guide member (42) and a center distance d2 between the first injector (2) and the second injector (3) is: d2-10≤D≤d2+10.

3. The ejector tube for a gas stove according to claim 2, characterized in that: The included angle α between the first flow guide (41) and the second flow guide (42) satisfies the following condition: 0≤α≤30°.

4. The ejector tube for a gas stove according to claim 2, characterized in that: The U-shaped anti-backfire cover (5) comprises a horizontal portion (51), and the flow guides (41, 42) further comprise a connecting rib (43) connecting the root of the first flow guide (41) and the root of the second flow guide (42), and the connecting rib (43) is connected to the horizontal portion (51).

5. The ejector tube for a gas stove according to claim 4, characterized in that: The distance d3 between the lowest end of the free end of the first flow guide (41) and the central axis of the first injector (2) satisfies the following condition: 0≤d3≤13mm.

6. The ejector tube for a gas stove according to claim 4 or 5, characterized in that: The distance d4 between the lowest end of the free end of the second flow guide (42) and the central axis of the second injector (3) satisfies: 0≤d4≤13mm.

7. The ejector tube for a gas stove according to claim 6, characterized in that: The first flow guide (41) and the second flow guide (42) are both plate-shaped, and the horizontal width of the first flow guide (41) and the second flow guide (42) is 3-12 mm.

1. An ejector tube for a gas stove, comprising an air inlet end (11) and an ejector (2, 3) arranged corresponding to the air inlet end (11), wherein there are at least two ejectors (2, 3), characterized in that: corresponding to two adjacent ejectors (2, 3) among the ejectors (2, 3), at least two parallel flow guide plates are arranged in the air inlet end (11) of the ejector tube (1), and the flow guide plates are parts of the flow guide (41, 42). The guide vane is perpendicular to the plane where the axis of the ejector (2, 3) is located, and is located between the plane and the peripheral wall of the corresponding ejector tube (1); along the airflow direction, each of the guide members (41, 42) is located at a downstream position of the corresponding ejector (2, 3); each of the guide vanes is located at a downstream position of the corresponding ejector (2, 3) and is arranged at a certain interval d1, and the interval d1 satisfies: 1.2mm≤d1≤2.8mm; and also includes an anti-flashback hood (5) arranged on the tube end surface (111) corresponding to the air inlet end (11) of the ejector tube (1), and the cross-section of the anti-flashback hood (5) is an inverted U-shape.

8. The ejector tube for a gas stove according to claim 1, characterized in that: The injectors (2, 3) have two, namely a first injector (2) and a second injector (3); the guide plate is a part of a guide member (41, 42); the guide member comprises a first guide member (41) located above the first injector (2) and a second guide member (42) located above the second injector (3); the relationship between a distance D between the first guide member (41) and the second guide member (42) and a center distance d2 between the first injector (2) and the second injector (3) is: d2-10≤D≤d2+10.

9. The ejector tube for a gas stove according to claim 2, characterized in that: The included angle α between the first flow guide (41) and the second flow guide (42) satisfies the following condition: 0≤α≤30°.

10. The ejector tube for a gas stove according to claim 2, characterized in that: The U-shaped anti-backfire cover (5) comprises a horizontal portion (51), and the flow guides (41, 42) further comprise a connecting rib (43) connecting the root of the first flow guide (41) and the root of the second flow guide (42), and the connecting rib (43) is connected to the horizontal portion (51).

11. The ejector tube for a gas stove according to claim 4, characterized in that: The distance d3 between the lowest end of the free end of the first flow guide (41) and the central axis of the first injector (2) satisfies the following condition: 0≤d3≤13mm.

12. The ejector tube for a gas stove according to claim 4 or 5, characterized in that: The distance d4 between the lowest end of the free end of the second flow guide (42) and the central axis of the second injector (3) satisfies: 0≤d4≤13mm.

13. The ejector tube for a gas stove according to claim 6, characterized in that: The first flow guide (41) and the second flow guide (42) are both plate-shaped, and the horizontal width of the first flow guide (41) and the second flow guide (42) is 3 to 12 mm.

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