Ejecting device and combustor comprising same
By setting a rotating anti-backflow part in the ejector device, the problem of gas backflow at the connection between the ejector tube and the gas chamber is solved, stable ejection of gas flow and combustion stability are achieved, and the use effect of the burner is improved.
Patent Information
- Application Number
- CN202422816462.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-11-19
AI Technical Summary
In existing burners, a sudden change in cross section at the connection between the ejector tube and the gas chamber leads to a gas recirculation zone, causing gas flow loss and unstable combustion.
A backflow prevention component is provided in the ejector device, which is connected by rotation around the ejector outlet. It conforms to the gas flow through viscosity and pressure difference, adapts to the change of gas flow rate, and reduces backflow.
Effectively reduce gas flow loss, ensure sufficient gas injection, improve combustion stability, and enhance user experience.
Smart Images
Figure CN223399768U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of burners, in particular to an ejection device and a burner comprising the same. Background Art
[0002] like Figure 1 As shown, in the prior art, a burner generally includes an ejector tube 1' and a gas chamber 3'. Gas is ejected from the ejector tube 1' into the gas chamber 3' for combustion. As combustion requirements change, the amount of gas ejected by the ejector tube 1' also changes.
[0003] To promote combustion, the gas chamber 3' is often larger, and the cross-sectional area of the ejection outlet 12' of the ejector tube 1' is smaller than the cross-sectional area of the inlet of the gas chamber 3'. The ejector tube 1' and the gas chamber 3' are usually eccentrically connected, so the cross-sectional area at the connection between the two will undergo an uneven mutation. This uneven mutation will cause a gas reflux zone 31' to appear on the side of the gas chamber 3' with the largest sudden change in cross-sectional size downstream of the ejector tube 1' outlet. When the gas flows through this position of the gas chamber 3', it will produce gas reflux, which will cause gas flow loss and insufficient gas injection due to the reflux, and then cause unstable combustion. Utility Model Content
[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that a gas reflux zone appears on the downstream side of the ejector tube outlet due to a sudden change in cross section at the connection between the ejector tube and the gas chamber, and to provide an ejector device and a burner including the same.
[0005] The utility model solves the above technical problems through the following technical solutions:
[0006] An ejection device, comprising an ejection pipe having an ejection outlet connected to a gas chamber, and a backflow prevention member, wherein a first end of the backflow prevention member is rotatably connected to a side of the ejection outlet facing the gas chamber, and a second end of the backflow prevention member faces the gas chamber;
[0007] The backflow prevention member is rotatable around a rotation axis passing through a first end of the backflow prevention member, and the rotation axis is arranged to match an edge of the ejection outlet.
[0008] In this technical solution, by providing the ejection device and setting a backflow prevention member connected to the ejection outlet and facing the gas chamber, the gas backflow area can be filled and the gas flow can be restricted, thereby reducing backflow and gas flow loss, ensuring sufficient gas ejection and more stable combustion. Furthermore, the backflow prevention member is configured to rotate around the first end connected to the ejection outlet. When the gas flows out of the ejection outlet, under the action of viscosity and pressure difference, the backflow prevention member will conform to the flowing gas, thereby allowing the backflow prevention member to adapt to changes in gas flow. When the gas flow rate increases, the gas impact on the side of the backflow prevention member near the gas increases, and thus the expansion angle (i.e., the angle between the expansion axis of the backflow prevention member from the first end to the second end and the surface where the ejection outlet is located) will spontaneously increase, reducing the restriction on the gas. When the gas flow rate decreases, the gas impact on the side of the backflow prevention member near the gas decreases, and thus the expansion angle will spontaneously decrease, increasing the restriction on the gas. In this way, the backflow prevention component can appropriately reduce the gas backflow under various gas flow rates and flow velocities.
[0009] Preferably, the backflow prevention member is an arc-shaped plate, and the inner arc surface of the arc-shaped plate is arranged toward the axis of the ejector tube.
[0010] In the present technical solution, through the above arrangement, the structure of the backflow prevention member can be made to fit the flowing gas more closely, thereby improving the adaptability to changes in gas flow and the gas restriction effect.
[0011] Preferably, there are multiple backflow prevention members, and the first ends of the multiple backflow prevention members are continuously arranged along the outlet edge of the ejector tube.
[0012] In this technical solution, through the above settings, the gas backflow situation can be further reduced with a relatively simple structure.
[0013] Preferably, the distance between adjacent backflow prevention members is less than or equal to 0.5 mm.
[0014] In this technical solution, the above arrangement can prevent gas from escaping from the gaps between adjacent backflow prevention members, thereby causing turbulence outside the backflow prevention members, while at the same time achieving better gas backflow prevention with fewer backflow prevention members.
[0015] Preferably, an angle formed by both sides of the first end of all the backflow prevention members relative to the central axis of the ejection outlet is defined as a first central angle, and a value range of the first central angle is 85°-100°.
[0016] In the present technical solution, through the above arrangement, the structure of the backflow prevention member can be more adapted to the distribution of the gas backflow area.
[0017] Preferably, the first end of the backflow prevention member and the central axis of the ejection outlet form a backflow prevention distance, and the ratio of the length of the backflow prevention member perpendicular to the rotation axis to the backflow prevention distance is in the range of 3:1-4:1.
[0018] In this technical solution, through the above arrangement, the structure of the backflow prevention member can be more adapted to the structure outside the injection outlet.
[0019] Preferably, the width of the backflow prevention member along the direction of the rotation axis gradually decreases from the first end to the second end.
[0020] In this technical solution, through the above settings, it is possible to avoid collision between the second ends of adjacent backflow prevention components when the gas flow rate decreases and the expansion angle spontaneously shrinks; and the range of variation of the expansion angle is increased, so that the backflow prevention components can adapt to smaller gas flow rates.
[0021] Preferably, a clamping groove is provided on the downstream side surface of the outlet of the ejector tube, and a rotating shaft is provided on the first end of the backflow prevention member, and the rotating shaft is rotatably clamped in the clamping groove.
[0022] In the present technical solution, through the above arrangement, the effect of the backflow prevention member rotating around the rotation axis passing through the first end of the backflow prevention member can be achieved with a relatively simple structure.
[0023] Preferably, the backflow prevention member is made of metal; and / or
[0024] The material of the backflow prevention member is consistent with that of the ejector tube.
[0025] In this technical solution, by setting the backflow preventer to be made of metal, the durability of the backflow preventer can be improved. By setting the material of the backflow preventer to be the same as that of the ejector tube, the thermal expansion coefficients of the two are consistent. In usage scenarios with large temperature fluctuations, the backflow preventer can be prevented from being flexibly rotated relative to the ejector tube due to dimensional differences caused by thermal expansion.
[0026] A burner comprising:
[0027] The ejection device as described above;
[0028] The gas cavity, the ejection outlet is connected to the gas cavity, and the backflow prevention member is located on one side of the gas backflow area in the gas cavity.
[0029] In the present technical solution, by providing the burner, the flame of the burner can be kept stable even when the gas flow rate changes, thereby improving the user experience.
[0030] The positive and progressive effects of the present invention are as follows: by providing the ejection device and setting a backflow prevention member connected to the ejection outlet and facing the gas chamber, the gas backflow area can be filled and the gas flow can be restricted, thereby reducing backflow and gas flow loss, ensuring sufficient gas ejection and more stable combustion. Furthermore, the backflow prevention member is configured to rotate around the first end connected to the ejection outlet. When the gas flows out of the ejection outlet, under the action of viscosity and pressure difference, the backflow prevention member will conform to the flowing gas, thereby allowing the backflow prevention member to adapt to changes in gas flow rate. When the gas flow rate increases, the gas impact on the side of the backflow prevention member near the gas increases, and the expansion angle will spontaneously increase, reducing the restriction on the gas. When the gas flow rate decreases, the gas impact on the side of the backflow prevention member near the gas decreases, and the expansion angle will spontaneously decrease, increasing the restriction on the gas. In this way, the backflow prevention member can appropriately reduce gas backflow under various gas flow and flow rate conditions. By providing this burner, the flame of the burner can be kept stable even when the gas flow rate changes, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 It is a schematic diagram of the matching relationship between the ejector tube and the gas chamber in the prior art.
[0032] Figure 2 This is a schematic diagram of the three-dimensional structure of an ejection device according to an embodiment of the present invention.
[0033] Figure 3 for Figure 2 A partial enlarged view of .
[0034] Figure 4 This is a schematic diagram of the position of a single backflow prevention component under a high flow state according to an embodiment of the present invention.
[0035] Figure 5 This is a schematic diagram of the position of a single backflow prevention component in a low flow state according to an embodiment of the present invention.
[0036] Description of reference numerals:
[0037] exist Figure 1 middle:
[0038] Ejector tube 1'
[0039] Injection outlet 12'
[0040] Gas chamber 3'
[0041] Gas recirculation zone 31'
[0042] exist Figures 2 to 5 middle:
[0043] Ejector tube 1
[0044] Card slot 11
[0045] Injection outlet 12
[0046] Backflow prevention device 2
[0047] Rotation axis 201
[0048] Expansion axis 202
[0049] Shaft 21
[0050] Gas chamber 3 DETAILED DESCRIPTION
[0051] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.
[0052] like Figure 2 、 Figure 3 As shown, this embodiment provides an ejection device, which includes an ejection tube 1 having an ejection outlet 12 that docks with the gas chamber 3. The ejection device also includes a backflow prevention member 2, the first end of which is rotatably connected to the side of the ejection outlet 12 that faces the gas chamber 3, and the second end of which faces the gas chamber 3. In this way, the gas backflow zone can be filled and the gas flow can be restricted, thereby reducing backflow and gas flow loss, ensuring sufficient gas injection and more stable combustion.
[0053] The backflow prevention member 2 is configured to rotate around a rotation axis 201 passing through the first end of the backflow prevention member 2. The rotation axis 201 is configured to cooperate with the edge of the injection outlet 12. When the gas flows out of the injection outlet 12, under the action of viscosity and pressure difference, the backflow prevention member 2 will adhere to the flowing gas, so that the backflow prevention member 2 can adapt to changes in gas flow.
[0054] See also Figure 4 、 Figure 5 When the gas flow rate increases, the gas impact on the surface of the backflow preventer 2 closest to the gas increases, causing the expansion angle α (i.e., the angle between the expansion axis 202 from the first end to the second end of the backflow preventer 2 and the surface where the ejection outlet 12 is located) to spontaneously increase, reducing the gas restriction. When the gas flow rate decreases, the gas impact on the surface of the backflow preventer 2 closest to the gas decreases, causing the expansion angle α to spontaneously decrease, increasing the gas restriction. In this way, the backflow preventer 2 can appropriately reduce gas backflow under various gas flow and flow rate conditions.
[0055] In this embodiment, the backflow prevention member 2 is an arc-shaped plate, and the inner arc surface of the arc-shaped plate is arranged toward the axis of the ejector tube 1. In this way, the structure of the backflow prevention member 2 can be more closely aligned with the flowing gas, thereby improving the adaptability to gas flow changes and the gas control effect.
[0056] Please refer back to Figure 2 In this embodiment, the number of the backflow prevention members 2 is multiple, and the first ends of the backflow prevention members 2 are continuously arranged along the outlet edge of the ejector tube 1. In this way, the gas backflow can be further reduced with a relatively simple structure.
[0057] In this embodiment, the spacing D between adjacent backflow preventers 2 is 0.11 mm. This prevents gas from escaping through the gaps between adjacent backflow preventers 2, thereby preventing turbulence outside the backflow preventers 2. Furthermore, a relatively small number of backflow preventers 2 can be used to achieve better gas backflow prevention. Of course, in other embodiments, the spacing between adjacent backflow preventers can also be set to other values within the range of less than or equal to 0.5 mm.
[0058] In this embodiment, the angle formed by the two sides of the first end of all backflow prevention members 2 relative to the central axis of the ejection outlet is a first central angle θ1, where θ1 = 85°. The angle formed by the two sides of the first end of a single backflow prevention member 2 relative to the central axis of the ejection outlet is a second central angle θ2, where θ2 = 12°. This allows the structure of the backflow prevention member 2 to be more adaptable to the distribution of the gas backflow zone. Of course, in other embodiments, the first central angle can also take other values within the range of 85°-100°, and the second central angle can correspondingly take other values within the range of less than or equal to the first central angle.
[0059] In this embodiment, the first end of the backflow prevention member 2 and the central axis of the ejection outlet define a backflow prevention distance R, and the length of the backflow prevention member 2 perpendicular to the rotation axis 201, L, equals 3R. This allows the structure of the backflow prevention member 2 to better adapt to the structure outside the ejection outlet 12. Of course, in other embodiments, the ratio of the backflow prevention member's length perpendicular to the rotation axis to the backflow prevention distance can also be set to other values within the range of 3:1 to 4:1.
[0060] In this embodiment, the width of the backflow prevention member 2 along the rotation axis 201 gradually decreases from the first end to the second end. This prevents the second ends of adjacent backflow prevention members 2 from colliding when the gas flow rate decreases and the expansion angle α spontaneously decreases. Furthermore, the range of the expansion angle α is increased, allowing the backflow prevention member 2 to adapt to smaller gas flow rates.
[0061] In this embodiment, the backflow prevention member 2 is in a trapezoidal shape; in other embodiments, other suitable shapes may be selected according to the situation of the ejection device.
[0062] In this embodiment, a slot 11 is provided on the downstream surface of the outlet of the ejector tube 1, and a rotating shaft 21 is provided at the first end of the backflow prevention member 2. The rotating shaft 21 is rotatably mounted in the slot 11. In this way, the backflow prevention member 2 can rotate about the rotation axis 201 passing through the first end of the backflow prevention member 2 with a relatively simple structure.
[0063] In this embodiment, the backflow prevention member 2 is made of metal, which can improve the durability of the backflow prevention member 2.
[0064] In this embodiment, the material of the backflow prevention member 2 is the same as that of the ejector tube 1. This ensures that the thermal expansion coefficients of the two are consistent, thus preventing the backflow prevention member 2 from being unable to flexibly rotate relative to the ejector tube 1 due to dimensional differences caused by thermal expansion in usage scenarios with large temperature fluctuations.
[0065] This embodiment also provides a burner, which includes:
[0066] The ejection device as described above;
[0067] The gas cavity (not shown in the figure), the ejection outlet 12 is connected to the gas cavity, and the backflow prevention member 2 is located on the side of the gas backflow area in the gas cavity.
[0068] In this way, the burner flame can be kept stable even when the gas flow rate changes, thereby improving the user experience.
[0069] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.
Claims
1. An ejection device, comprising an ejection tube, wherein the ejection tube has an ejection outlet connected to a gas chamber, characterized in that: The ejection device further includes a backflow prevention member, wherein a first end of the backflow prevention member is rotatably connected to a side of the ejection outlet facing the gas chamber, and a second end of the backflow prevention member faces the gas chamber; The backflow prevention member is rotatable around a rotation axis passing through a first end of the backflow prevention member, and the rotation axis is arranged to match an edge of the ejection outlet.
2. The ejection device according to claim 1, wherein: The backflow prevention component is an arc-shaped plate, and the inner arc surface of the arc-shaped plate is arranged toward the axis of the ejector tube.
3. The ejection device according to claim 1, wherein: There are multiple backflow prevention members, and the first ends of the multiple backflow prevention members are continuously arranged along the outlet edge of the ejector tube.
4. The ejection device according to claim 3, wherein: The distance between adjacent backflow prevention members is less than or equal to 0.5 mm.
5. The ejection device according to claim 3, wherein: Assume that the angle formed by both sides of the first end of all the backflow prevention members relative to the central axis of the ejection outlet is a first central angle, and the value range of the first central angle is 85°-100°.
6. The ejection device according to claim 1, wherein The first end of the backflow prevention member and the central axis of the ejection outlet form a backflow prevention distance, and the ratio of the length of the backflow prevention member perpendicular to the rotation axis to the backflow prevention distance is in a range of 3:1-4:
1.
7. The ejection device according to claim 1, wherein: The width of the backflow prevention member along the direction of the rotation axis gradually decreases from the first end to the second end.
8. The ejection device according to claim 1, wherein: A clamping groove is provided on the downstream side surface of the outlet of the ejector tube, and a rotating shaft is provided on the first end of the backflow prevention member. The rotating shaft is rotatably clamped in the clamping groove.
9. The ejection device according to claim 1, wherein: The backflow prevention member is made of metal; and / or The material of the backflow prevention member is consistent with that of the ejector tube.
10. A burner, characterized in that: It includes: The ejection device according to any one of claims 1 to 9; The gas cavity, the ejection outlet is connected to the gas cavity, and the backflow prevention member is located on one side of the gas backflow area in the gas cavity.