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 at least two ejectors arranged corresponding to the air inlet end, and is characterized in that: it also comprises at least one guide member, the guide member having a partition plate portion, the first end of the partition plate portion is at least partially inserted into the air inlet end of the ejector tube, and the ejector tube cavities located on both sides of the partition plate portion are respectively opposite to the corresponding two ejectors. Compared with the prior art, the advantage of the present invention is that the guide member is located in the middle or near the middle position of two adjacent ejectors, which can avoid mutual interference between air streams in the initial stage of ejection, increase the primary air supply amount, promote the mutual mixing between the air streams entering the inner cavity of the ejector tube and the air, so that the gas and air are mixed more fully. When the gas is ejected from the nozzle at a high speed, the surrounding primary air is ejected into the ejector tube, and the two begin to mix, and finally mix in advance when the mixed gas is still maintained at a relatively high speed.

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 at least two ejectors arranged corresponding to the air inlet end, and is characterized in that: it also includes at least one guide member, the guide member has a separator portion, and the first end of the separator portion is at least partially inserted into the air inlet end of the ejector tube, and the ejector tube cavities located on both sides of the separator portion are respectively opposite to the corresponding two ejectors.

[0006] Preferably, the separator portion of the guide member has a spacing between the second end away from the air inlet end of the ejector tube and the corresponding two ejectors. That is, along the airflow direction, the guide member is located at an upstream position between the two adjacent ejectors. When the gas is ejected from the ejector at a high speed, the surrounding primary air is ejected into the ejector tube, and the two begin to mix. When the highly mixed gas passes through the guide member, due to the wall attachment effect, the high-speed airflow ejection direction on both sides of the guide member begins to move toward the middle guide member. Finally, when the mixed gas is still maintained at a relatively high speed, it can be mixed in advance, so that the gas and primary air are better mixed.

[0007] Furthermore, the guide member is perpendicular to the plane where the axes of the two adjacent injectors are located.

[0008] 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.

[0009] In order to better place the anti-backfire hood, the pipe end face corresponding to the air inlet end of the ejector pipe is in an inverted T shape, with a horizontal pipe and a vertical pipe connected to each other. The ejector is arranged corresponding to the horizontal pipe, and the vertical pipe extends upward and supports the anti-backfire hood.

[0010] In order to better exert the wall attachment effect of the guide member, the U-shaped anti-backfire cover includes a horizontal portion, the root of the guide member is inserted on the horizontal portion, and the free ends of the guide member are located below the axes of two adjacent injectors.

[0011] Furthermore, the distance d1 between the lowest end of the free end of the guide and the axes of the two adjacent injectors satisfies: 3mm≤d1≤5.5mm. If the distance d1 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.

[0012] Preferably, the guide is arranged relative to the two adjacent ejectors in the airflow direction of the horizontal tube at a certain interval d2, and the interval d2 satisfies: 1.2mm≤d2≤2.8mm. The closer the guide is to the ejector, the more sensitive the performance of guiding the high-speed airflow on both sides of the ejector to the middle guide is.

[0013] The guide member can have a variety of structures. Considering the simplicity of the structure, the guide member is plate-shaped, and the horizontal width of the 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.

[0014] In order to ensure that the guide member is perpendicular to the plane where the axes of two adjacent injectors are located, the root of the guide member includes a first limiting foot extending along the axial direction of the horizontal pipe, and correspondingly, the inner wall of the vertical pipe has a first socket for inserting the first limiting foot.

[0015] In order to further effectively fix the guide member on the anti-backfire cover, the root of the guide member also includes a second limit foot and a third limit foot centered on the first limit foot and respectively arranged on both sides of the first limit foot. Correspondingly, the horizontal part has a second socket and a third socket for inserting the second limit foot and the third limit foot respectively.

[0016] Preferably, the second limiting leg further comprises a second bending portion that is left-leaning and bends upwards and / or the third limiting leg further comprises a third bending portion that is right-leaning and bends upwards. The second bending portion and / or the third bending portion can better insert the second limiting leg and the third limiting leg into the second socket and the third socket.

[0017] Compared with the prior art, the advantage of the present invention is that the first end of the guide member partition plate is at least partially inserted into the air inlet end of the ejector tube, which can avoid mutual interference between the airflow strands in the initial stage of injection, increase the primary air supply, and promote the mutual mixing between the airflow strands entering the inner cavity of the ejector tube and the air, so that the gas and air are mixed more fully, which is beneficial to improving the combustion performance of the burner. When the gas is ejected from the nozzle at a high speed, the surrounding primary air is injected into the ejector tube, and the two begin to mix. When the highly mixed gas passes through the guide member, due to the wall attachment effect, the injection direction of the high-speed airflow on both sides of the guide member begins to move toward the middle guide member. Finally, when the mixed gas is still maintained at a relatively high speed, it is mixed in advance, so that the gas and primary air are better mixed, which is beneficial to more complete combustion, higher thermal efficiency, and lower emissions of waste gases such as CO. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of an ejector adapted to the air inlet end of an ejector pipe according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A cross-sectional view at an angle;

[0020] Figure 3 In the embodiment of the present invention, the flow guide members are respectively located at the upstream middle position of the adjacent first injector and the second injector;

[0021] Figure 4 It is a schematic diagram of the structure of the ejector tube in an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the structure of the flow guide member in the embodiment of the present invention;

[0023] Figure 6 It is a schematic structural diagram of the anti-flashback cover in an embodiment of the present invention;

[0024] Figure 7 for Figure 1 A schematic diagram of the structure from another angle;

[0025] Figure 8 Schematic diagram of the distribution of the ejector and the flow guide in Example 2 of the present invention;

[0026] Fig. 9 Schematic diagram of the distribution of the injector and the guide member in Example 3 of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings.

[0028] Example 1

[0029] like Figures 1 to 6 As shown, this embodiment is the best embodiment of the present invention. The ejector tube 1 for the gas stove of this embodiment includes an air inlet end 11 and at least two ejectors arranged corresponding to the air inlet end 11, and also includes at least one guide member 4, the guide member 4 has a separator portion, and the first end 401 of the separator portion is at least partially inserted into the air inlet end 11 of the ejector tube 1, and the ejector tube cavities located on both sides of the separator portion are respectively opposite to the corresponding two ejectors. This embodiment is described by taking two ejectors, namely the first ejector 2 and the second ejector 3, and a guide member 4 as examples, the separator portion of the guide member 4, its second end 402 away from the air inlet end 11 of the ejector tube 1 has a spacing with the corresponding two ejectors, that is, along the air flow direction, the guide member 4 is located in the upstream position between the two adjacent ejectors. When the gas is ejected from the injector at a high speed, the surrounding primary air is injected into the injector tube 1, and the two begin to mix. When the highly mixed gas passes through the guide member 4, due to the wall effect, the injection direction of the high-speed airflow on both sides of the guide member 4 begins to move toward the middle guide member 4. Finally, while the mixed gas is still maintained at a relatively high speed, it can be mixed in advance, so that the gas and primary air are better mixed. Preferably, the guide member 4 is perpendicular to the plane where the axes of the first injector 2 and the second injector 3 are located.

[0030] In order to prevent flashback, there is also a flashback hood 5 arranged on the pipe end face 111 corresponding to the air inlet end 11 of the ejector tube 1. The cross-section of the flashback hood 5 is an inverted U-shape. In order to better place the flashback hood 5, the pipe end face 111 corresponding to the air inlet end 11 of the first ejector tube 1 is an inverted T-shape, with a horizontal tube 1111 and a vertical tube 1112 interconnected. The ejector is arranged corresponding to the horizontal tube 1111, and the vertical tube 1112 extends upward and supports the flashback hood 5. In order to better play the wall attachment effect of the guide member 4, the U-shaped flashback hood 5 includes a horizontal portion 51, the root of the guide member 4 is inserted on the horizontal portion 51, and the free ends 41 of the guide member 4 are located below the axes of the adjacent first ejector 2 and the second ejector 3. In addition, the distance d1 between the lowest end of the free end 41 of the guide member 4 and the axis of the first ejector 2 or the second ejector 3 satisfies: 3mm≤d1≤5.5mm. If the distance d1 is too large, it is not conducive to the high-speed airflow ejection directions on both sides of the guide member 4 to start to move closer to the middle, and if it is too small, the guide member 4 cannot play a corresponding guiding role. Preferably, the guide member 4 is arranged relative to the first injector 2 and the second injector 3 in the airflow direction of the horizontal tube 1111 and at a certain interval d2, and the interval d2 satisfies: 1.2mm≤d2≤2.8mm, wherein, the closer the guide member 4 is to the injector, the more sensitive the performance of guiding the high-speed airflow on both sides of the injector to the middle guide member 4 is. The structure of the guide member 4 can be various. From the perspective of structural simplicity, the guide member 4 is plate-shaped, and the surface of the plate-shaped guide member 4 is smooth without burrs. The horizontal width of the guide member 4 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 4 within a certain range, the better the effect and the more sensitive the performance. The horizontal width of the guide member 4 is preferably 5 mm.

[0031] In order to ensure that the guide member 4 is perpendicular to the plane where the axes of the first injector 2 and the second injector 3 are located, the root of the guide member 4 includes a first limit foot 42 extending along the axial direction of the horizontal tube 1111, and correspondingly, the inner wall of the vertical tube 1112 has a first socket 1113 for inserting the first limit foot 42. In order to further effectively fix the guide member 4 on the anti-backfire hood 5, the root of the guide member 4 also includes a second limit foot 43 and a third limit foot 44 centered on the first limit foot 42 and respectively arranged on both sides of the first limit foot 42. Correspondingly, the horizontal part 51 has a second socket 511 and a third socket 512 for inserting the second limit foot 43 and the third limit foot 44 respectively. Preferably, the second limiting foot 43 also has a second bending portion 431 that is inclined to the left and bent upward, and / or the third limiting foot 44 also has a third bending portion 441 that is inclined to the right and bent upward. The second bending portion 431 and / or the third bending portion 441 can better insert the second limiting foot 43 and the third limiting foot 44 into the second socket 511 and the third socket 512. Since the guide member 4 is located in the middle or near the middle of two adjacent ejectors, mutual interference between the airflow strands in the initial stage of the ejection can be avoided, the primary air supply amount can be increased, and the airflow strands entering the inner cavity of the ejection tube 1 can be promoted. The mutual mixing with air makes the gas and air mix more fully, which is beneficial to improving the combustion performance of the burner. When the gas is ejected from the nozzle at a high speed, the surrounding primary air is injected into the injection tube 1, and the two begin to mix. When the highly mixed gas passes through the guide member 4, due to the wall effect, the high-speed airflow injection direction on both sides of the guide member 4 begins to move toward the middle guide member 4. Finally, when the mixed gas is still maintained at a relatively high speed, it is mixed in advance, so that the gas and primary air are better mixed, which is beneficial to more complete combustion, higher thermal efficiency, and lower emissions of waste gases such as CO.

[0032] Example 2

[0033] 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 8 shown.

[0034] Example 3

[0035] 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 Fig. 9 shown.

Claims

1. An ejector tube for a gas stove, comprising an air inlet end (11) and at least two ejectors (2, 3) arranged corresponding to the air inlet end (11), characterized in that: The invention also comprises at least one guide member (4), the guide member (4) having a separator portion, and the first end (401) of the separator portion is at least partially inserted into the air inlet end (11) of the ejector tube (1), and the ejector tube cavities located on both sides of the separator portion are respectively opposite to the corresponding two ejectors (2, 3); the separator portion of the guide member (4), the second end (402) of which is away from the air inlet end (11) of the ejector tube, is spaced from the corresponding two ejectors (2, 3); the guide member (4) and the two adjacent ejectors (2 , 3) are perpendicular to the plane where the axis is located; the pipe end face (111) corresponding to the air inlet end (11) of the ejector pipe (1) is in an inverted T-shape, and has a horizontal pipe (1111) and a vertical pipe (1112) that are interconnected; the guide member (4) is arranged relative to the two adjacent ejectors (2, 3) in the airflow direction of the horizontal pipe (1111) and at a certain interval d2, and the interval d2 satisfies: 1.2mm≤d2≤2.8mm; the guide member (4) is plate-shaped, and the horizontal width of the guide member (4) is 3~12mm.

2. The ejector tube for a gas stove according to claim 1, characterized in that: It also includes a backfire prevention cover (5) arranged on a pipe end surface (111) corresponding to the air inlet end (11) of the ejector pipe (1), wherein the backfire prevention cover (5) is in an inverted U shape.

3. The ejector tube for a gas stove according to claim 2, characterized in that: The ejector is arranged corresponding to the horizontal pipe (1111), and the vertical pipe (1112) extends upward and supports the anti-backfire cover (5).

4. The ejector tube for a gas stove according to claim 3, characterized in that: The inverted U-shaped backfire protection cover (5) comprises a horizontal portion (51), the root of the flow guide (4) is inserted into the horizontal portion (51), and the free end (41) of the flow guide (4) is located below the axis of two adjacent injectors (2, 3).

5. The ejector tube for a gas stove according to claim 4, characterized in that: The distance d1 between the lowest end of the free end (41) of the guide member (4) and the axes of the two adjacent injectors satisfies: 3mm≤d1≤5.5mm.

6. The ejector tube for a gas stove according to claim 4 or 5, characterized in that: The root of the flow guide (4) comprises a first limiting foot (42) extending along the axial direction of the horizontal tube (1111), and correspondingly, the inner side wall of the vertical tube (1112) has a first socket (1113) for inserting the first limiting foot (42).

7. The ejector tube for a gas stove according to claim 6, characterized in that: The root of the guide member (4) further comprises a second limiting foot (43) and a third limiting foot (44) centered on the first limiting foot (42) and respectively arranged on both sides of the first limiting foot (42); correspondingly, the horizontal portion (51) comprises a second socket (511) and a third socket (512) for inserting the second limiting foot (43) and the third limiting foot (44) respectively.

8. The ejector tube for a gas stove according to claim 7, characterized in that: The second limiting leg (43) further comprises a second bending portion (431) which is inclined to the left and bent upwards, and / or the third limiting leg (44) further comprises a third bending portion (441) which is inclined to the right and bent upwards.

Images