Premixer and fuel gas premixing device

Abstract

The utility model discloses a premixer and premixing fuel gas device, including shell, flap mechanism and regulating valve, shell has air flow channel and fuel gas flow channel, air flow channel has first intake runner, second intake runner and air outlet runner, fuel gas flow channel has fuel gas intake runner, first fuel gas output runner and second fuel gas output runner, and the flap mechanism is provided with the regulating valve. The first fuel gas output flow channel is communicated with the first gas inlet flow channel, the second fuel gas output flow channel is communicated with the second gas inlet flow channel, and the turning plate mechanism is rotatably arranged on the shell and located between the first gas inlet flow channel and the air outlet flow channel and can close the first gas inlet flow channel and the air outlet flow channel. When the gas inlet pressure of the first gas inlet flow channel reaches a preset value, the turning plate mechanism can rotate and communicate the first gas inlet flow channel with the air outlet flow channel, and the adjusting valve is arranged on the gas inlet flow channel and used for adjusting the gas inlet amount. And under the low-load working condition, the mixing effect can be improved, and the mixing effect can be dynamically adjusted.

Description

Premixer and premixed gas device Technical Field

[0001] This utility model relates to the technical field of gas water heaters, and in particular to a premixer and a premixed gas device. Background Technology

[0002] In premixed gas systems, the premixer, as a key component, is primarily used to premix fuel gas (such as natural gas or liquefied petroleum gas) with air to form a homogeneous combustible mixture, thereby achieving efficient and clean combustion. Currently, controlling the air-fuel ratio under low-load conditions is a critical technical challenge in combustion systems, with the core difficulty lying in maintaining mixing uniformity under low flow conditions. Existing technologies typically employ a venturi tube design for premixers, using valves to separately control the flow rates of fuel gas and air to achieve proportional mixing. However, under low-load conditions, the fluid velocity and flow rate are low, leading to decreased mixing efficiency and a higher likelihood of uneven mixing. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a premixer that can solve the problem of poor mixing effect under low load conditions.

[0004] A premixer according to a first aspect of the present invention includes: a housing, a flap mechanism, and a regulating valve. The housing has an air passage and a gas passage. The air passage has a first inlet passage, a second inlet passage, and an air outlet passage. Both the first inlet passage and the second inlet passage are connected to the air outlet passage. The gas passage has a gas inlet passage, a first gas outlet passage, and a second gas outlet passage. Both the first gas outlet passage and the second gas outlet passage are connected to the gas inlet passage, and the first gas outlet passage is connected to the first inlet passage, and the second gas outlet passage is connected to the second inlet passage. The flap mechanism is rotatably disposed on the housing and located between the first inlet passage and the air outlet passage. The flap mechanism can close the first inlet passage and the air outlet passage under its own gravity. When the gas pressure in the first inlet passage reaches a predetermined value, the flap mechanism can rotate and connect the first inlet passage and the air outlet passage. The regulating valve is disposed on the gas inlet passage and is used to regulate the gas intake volume.

[0005] The premixer according to the embodiments of the present invention has at least the following beneficial effects: the flap mechanism can open and close according to the load level. Under low load conditions, it can close the first inlet air passage. The blocked first inlet air passage can form turbulent mixed gas, which can improve the mixing effect. Moreover, the air intake is only from the second inlet air passage, which can reduce the cross-sectional area of ​​the air inlet, increase the flow velocity, and reduce the stagnation zone or short-circuit flow, thereby improving the mixing effect under low load conditions. Furthermore, the flap mechanism can also open and close according to the working conditions, which can dynamically adjust the mixing effect.

[0006] According to some embodiments of the present invention, the housing includes an air intake pipe housing and a partition. The air intake pipe housing is provided with the air flow channel. The partition is provided on the inner wall of the air intake pipe housing. The partition extends along the axial direction of the air intake pipe housing and is provided near the air intake end of the air intake pipe housing. The partition can separate a portion of the air flow channel into a first air intake channel and a second air intake channel. The portion of the air flow channel near the air outlet end of the air intake pipe housing is provided as the air outlet channel.

[0007] According to some embodiments of the present invention, the housing further includes a gas intake pipe housing, which is connected to the air intake pipe housing and can define the gas intake flow channel and the annular flow channel. The annular flow channel is arranged around the air intake pipe housing. The side wall of the air intake pipe housing is provided with a first opening communicating with the first intake flow channel and a second opening communicating with the second intake flow channel. The first opening communicates with the annular flow channel and defines the first gas output flow channel. The second opening communicates with the annular flow channel and defines the second gas output flow channel. The gas intake flow channel extends radially along the air intake pipe housing to connect with the annular flow channel.

[0008] According to some embodiments of this utility model, the air intake pipe shell and the gas intake pipe shell are an integral structure.

[0009] According to some embodiments of the present invention, the air intake pipe shell includes a first air intake pipe shell and a second air intake pipe shell, the second air intake pipe shell being detachably connected to the first air intake pipe shell, the partition being disposed on the first air intake pipe shell, and the flapping mechanism being installed on the second air intake pipe shell.

[0010] According to some embodiments of the present invention, the first intake pipe shell is provided with a first notch and a second notch at the end near the air outlet end of the air flow channel. An annular groove can be defined between the first intake pipe shell and the gas intake pipe shell. When the second intake pipe shell is installed on the first intake pipe shell, the second intake pipe shell can cooperate with the first notch to define the first opening, cooperate with the second notch to define the second opening, and cooperate with the annular groove to define the annular flow channel.

[0011] According to some embodiments of the present invention, the flip-plate mechanism includes a cover plate, the cover plate being pivotally connected to the housing, and the pivot of the cover plate being located at one end of the partition plate near the air outlet passage, and the first air inlet passage being located below the second air inlet passage.

[0012] According to some embodiments of the present invention, when the flap closes the first air inlet channel and the air outlet channel, the included angle between the flap and the vertical plane is set to 12°-18°.

[0013] According to some embodiments of this utility model, the regulating valve is configured as an electric valve.

[0014] According to a second aspect of the present invention, a premixed gas device includes a premixed gas device employing the premixer described above.

[0015] The premixed gas device according to the embodiments of the present utility model has at least the following beneficial effects: by adopting the above-mentioned premixer, the performance of the premixed gas device under low load conditions can be improved, the occurrence of flameout can be reduced, and the adjustable load range can be further expanded, thereby further meeting the user's needs.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 is a structural schematic diagram of some embodiments of the present utility model;

[0019] Figure 2 is a schematic diagram of the structure in Figure 1 from another direction;

[0020] Figure 3 is a cross-sectional view of the structure in Figure 1;

[0021] Figure 4 is an exploded view of the structure in Figure 1;

[0022] Figure 5 is a structural diagram of some premixer embodiments;

[0023] Figure 6 is a cross-sectional view of Figure 5.

[0024] Figure label:

[0025] Housing 100, air flow channel 110, first air intake channel 111, second air intake channel 112, air outlet channel 113, gas flow channel 120, gas intake channel 121, air intake pipe housing 130, partition 131, first opening 132, second opening 133, first intake pipe housing 134, first notch 1341, second notch 1342, annular groove 1343, second intake pipe housing 135, gas intake pipe housing 140, annular flow channel 141;

[0026] Flip-up mechanism 200, cover plate 210;

[0027] Regulating valve 300. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Referring to Figures 1 to 4, the premixer according to a first aspect embodiment of the present invention includes a housing 100, a flap mechanism 200, and a regulating valve 300. The housing 100 has an air flow channel 110 and a gas flow channel 120. The air flow channel 110 has a first inlet flow channel 111, a second inlet flow channel 112, and an air outlet flow channel 113. The first inlet flow channel 111 and the second inlet flow channel 112 are respectively connected to the air outlet flow channel 113. The gas flow channel 120 has a gas inlet flow channel 121, a first gas outlet flow channel, and a second gas outlet flow channel. The first gas outlet flow channel and the second gas outlet flow channel are both connected to the gas inlet flow channel 121. The first gas output channel is connected to the first gas inlet channel 111, and the second gas output channel is connected to the second gas inlet channel 112. The flap mechanism 200 is rotatably disposed on the housing 100 and located between the first gas inlet channel 111 and the air outlet channel 113. Under its own gravity, the flap mechanism 200 can close the first gas inlet channel 111 and the air outlet channel 113. When the gas pressure of the first gas inlet channel 111 reaches a predetermined value, the flap mechanism 200 can rotate and connect the first gas inlet channel 111 and the air outlet channel 113. The regulating valve 300 is disposed on the gas inlet channel 121 and is used to regulate the gas intake volume.

[0032] Specifically, in the prior art, under low load conditions, the flow rate and velocity of air and fuel gas in the premixer are relatively small. At low flow rates, the fluid easily changes from turbulent to laminar flow, significantly reducing mixing efficiency and causing local air-fuel ratio deviations from the set value. Furthermore, at low flow velocities, stagnant zones or short-circuit flows of fuel or air may form within the premixer, exacerbating the problem of incomplete mixing. In this embodiment, under low load conditions, air cannot push the flap mechanism 200, which can block the first intake channel 111. Air can only enter from the second intake channel 112. The fuel gas flow rate is adjusted by the regulating valve 300 to match the air intake volume and form a predetermined air-fuel ratio. The specific adjustment ratio is not limited here. The fuel gas enters from the fuel gas intake channel 121 and is input into the first intake channel 111 through the first fuel gas output channel and into the second intake channel 112 through the second fuel gas output channel. Because the flap mechanism 200 blocks the first intake channel 111, the fuel gas flow rate is adjusted by the regulating valve 300 to match the air intake volume and form a predetermined air-fuel ratio. After the first intake air passage 111 is blocked, the cross-sectional area of ​​the air inlet can be reduced, thereby increasing the flow velocity and reducing the stagnation zone or short-circuit flow. At the same time, the blocked first intake air passage 111 can form turbulence, thereby improving the mixing effect. This allows for accurate control of the air-fuel ratio of the premixed fluid under low load conditions. It can be understood that when the operating load of the premixer increases, the flap mechanism 200 can open the first intake air passage 111 at a corresponding flip angle according to the air flow, and can adaptively adjust the cross-sectional area of ​​the air inlet, thereby achieving dynamic mixing regulation.

[0033] Referring to Figures 1 to 4, in some embodiments of this utility model, the housing 100 includes an air intake pipe housing 130 and a partition 131. An air flow channel 110 is provided inside the air intake pipe housing 130. The partition 131 is disposed on the inner wall of the air intake pipe housing 130, extending axially along the air intake pipe housing 130 and located near the air intake end of the air intake pipe housing 130. The partition 131 can divide a portion of the air flow channel 110 into a first air intake channel 111 and a second air intake channel 112. A portion of the air flow channel 110 near the air outlet end of the air intake pipe housing 130 is designated as an air outlet channel 113. Specifically, the air intake pipe housing 130 has a generally straight air flow channel 110. A partition 131 can be provided at the air intake end, with both sides of the partition 131 connected to the side wall of the air intake pipe housing 130, thereby dividing the flow channel into a first air intake channel 111 and a second air intake channel 112. Furthermore, the baffle 131 extends axially, that is, it extends along the direction of fluid flow, which can reduce resistance. It is conceivable that the baffle 131 may have a pointed structure near the air inlet end to further reduce resistance, and the baffle 131 may extend approximately to the middle of the air flow channel 110, with the rear of the air flow channel 110 being configured as the air outlet channel. The first air inlet channel 111 and the second air inlet channel 112 can converge into the air outlet channel, and the flap mechanism 200 can open and close at the end of the first air inlet channel 111.

[0034] Referring to Figures 1 to 4, in some embodiments of this utility model, the housing 100 further includes a gas intake pipe housing 140, which is connected to the air intake pipe housing 130 and defines a gas intake passage 121 and an annular passage 141. The annular passage 141 surrounds the air intake pipe housing 130. The side wall of the air intake pipe housing 130 is provided with a first opening 132 communicating with the first intake passage 111 and a second opening 133 communicating with the second intake passage 112. The first opening 132 communicates with the annular passage 141 and defines a first gas output passage. The second opening 133 communicates with the annular passage 141 and defines a second gas output passage. The gas intake passage 121 extends radially along the air intake pipe housing 130 to connect with the annular passage 141. Specifically, the gas intake pipe shell 140 is located around the air intake pipe shell 130. The annular flow channel 141 can be arranged around the circumference of the air flow channel 110. The gas intake flow channel 121 can be connected to the annular flow channel 141 from the side, forming a structure similar to a tee. The air intake pipe shell 130 can be provided with a first opening 132 and a second opening 133 on its inner side wall. The first opening 132 can connect the annular flow channel 141 with the first intake flow channel 111, and the second opening 133 can connect the annular flow channel 141 with the second intake flow channel 112. The path of the gas entering the first intake flow channel 111 through the annular flow channel 141 is the first gas output flow channel, and the path of the gas entering the second intake flow channel 112 through the annular flow channel 141 is the second gas output flow channel. With the above structure, air and gas can be easily introduced, the flow channel arrangement is more reasonable, and the structure of the premixer can be more compact.

[0035] It should be noted that the gas inlet channel 121 can be set close to the first opening 132, so that the distance between the gas inlet channel 121 and the first opening 132 is reduced and the distance between the gas inlet channel 121 and the second opening 133 is increased. When the flap mechanism 200 is basically closed, the air velocity at the second opening 133 is faster than that at the first opening 132. Therefore, through channel distance compensation, the gas can be output and mixed more evenly.

[0036] In some embodiments of this utility model, the air intake manifold shell 130 and the gas intake manifold shell 140 are integrally formed. The manifold shells can be integrally molded by injection molding, which facilitates manufacturing.

[0037] Referring to Figures 3 and 4, in some embodiments of this utility model, the air intake pipe housing 130 includes a first air intake pipe housing 134 and a second air intake pipe housing 135. The second air intake pipe housing 135 can be detachably connected to the first air intake pipe housing 134. A partition 131 is disposed on the first air intake pipe housing 134, and a flip-plate mechanism 200 is installed on the second air intake pipe housing 135. Specifically, the second air intake pipe housing 135 can be detached, and then the flip-plate mechanism 200 can be installed on the second air intake pipe housing 135 before the second air intake pipe housing 135 is installed on the first air intake pipe housing 134, which facilitates the assembly of the flip-plate mechanism 200.

[0038] Referring to Figure 4, in some embodiments of this utility model, the first intake pipe shell 134 is provided with a first notch 1341 and a second notch 1342 at the end near the air outlet of the air flow channel 110. An annular groove 1343 can be defined between the first intake pipe shell 134 and the gas intake pipe shell 140. When the second intake pipe shell 135 is installed on the first intake pipe shell 134, the second intake pipe shell 135 can cooperate with the first notch 1341 to define the first opening 132, cooperate with the second notch 1342 to define the second opening 133, and cooperate with the annular groove 1343 to define the annular flow channel 141. Specifically, the first air intake shell 134 can extend to the middle of the air flow channel 110, and the first notch 1341 and the second notch 1342 at the end are easy to process and easy to demold after injection molding, and can also be removed by subtraction. Similarly, the annular groove 1343 can also facilitate injection molding and demolding. The second air intake shell 135 can be set in a frustum shape. After being installed with the first air intake shell 134, it can close the annular groove 1343 to form an annular flow channel 141, and can abut against the end of the first air intake shell 134, forming the first notch 1341 and the second notch 1342 to form the first opening 132 and the second opening 133. With the above structure, it is easy to process and manufacture, and production costs are reduced.

[0039] Referring to Figures 1 to 4, in some embodiments of this utility model, the flap mechanism 200 includes a cover plate 210, which is pivotally connected to the housing 100. The pivot of the cover plate 210 is located at one end of the partition 131 near the air outlet passage 113, and the first air inlet passage 111 is located below the second air inlet passage 112. Specifically, the cover plate 210 can be flipped up and down, while the first air inlet passage 111 is located below. Under its own weight, the cover plate 210 flips downward and can block the first air inlet passage 111. When the flow rate increases, the cover plate 210 can be pushed upward and flipped, thereby opening the first air inlet passage 111, and the opening can be adaptively adjusted.

[0040] Referring to Figure 3, in some embodiments of this utility model, when the cover plate 210 closes the first air inlet channel 111 and the air outlet channel 113, the included angle between the cover plate 210 and the vertical plane is set to 12°-18°. This angle range ensures that the cover plate 210 can close the first air inlet channel 111 under low-load conditions, and can open when the flow rate increases.

[0041] In some embodiments of this utility model, the regulating valve 300 is configured as an electric valve. It is conceivable that the electric valve can be connected to corresponding control components to dynamically adjust the gas flow rate; the specific solution is a conventional technical means and will not be described in detail here.

[0042] According to a second aspect embodiment of the present invention, a premixed gas device includes a premixed gas device employing the aforementioned premixer. By employing the aforementioned premixer, the performance of the premixed gas device under low-load conditions can be improved, the occurrence of flameout can be reduced, and the adjustable load range can be further expanded, thereby further meeting the user's needs.

[0043] Referring to Figures 5 and 6, it should be noted that in some embodiments, the air passage 110 may not be equipped with a partition 131, and the flap mechanism 200 can close the entire air passage 110. The gas and air can mix in front of the flap mechanism 200 and push the flap mechanism 200 to open the air passage 110 for output.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A premixer, characterized in that, include: The housing (100) has an air flow channel (110) and a gas flow channel (120). The air flow channel (110) has a first air intake channel (111), a second air intake channel (112), and an air outlet channel (113). The first air intake channel (111) and the second air intake channel (112) are both connected to the air outlet channel (113). The gas flow channel (120) has a gas intake channel (121), a first gas output channel, and a second gas output channel. The first gas output channel and the second gas output channel are both connected to the gas intake channel (121). The first gas output channel communicates with the first air intake channel (111), and the second gas output channel communicates with the first gas intake channel (111). It is connected to the second air intake channel (112); a flap mechanism (200) is rotatably disposed in the housing (100) and located between the first air intake channel (111) and the air outlet channel (113). The flap mechanism (200) can close the first air intake channel (111) and the air outlet channel (113) under its own gravity. When the air pressure of the first air intake channel (111) reaches a predetermined value, the flap mechanism (200) can rotate and connect the first air intake channel (111) and the air outlet channel (113); a regulating valve (300) is disposed in the gas intake channel (121). The regulating valve (300) is used to regulate the gas intake volume.

2. The premixer according to claim 1, characterized in that, The housing (100) includes an air intake pipe housing (130) and a partition (131). The air intake pipe housing (130) contains the air flow channel (110). The partition (131) is disposed on the inner wall of the air intake pipe housing (130). The partition (131) extends along the axial direction of the air intake pipe housing (130) and is disposed near the air intake end of the air intake pipe housing (130). The partition (131) can separate a portion of the air flow channel (110) into a first air intake channel (111) and a second air intake channel (112). A portion of the air flow channel (110) near the air outlet end of the air intake pipe housing (130) is disposed as the air outlet channel (113).

3. The premixer according to claim 2, characterized in that, The housing (100) further includes a gas intake pipe housing (140), which is connected to the air intake pipe housing (130) and defines the gas intake passage (121) and the annular passage (141). The annular passage (141) surrounds the air intake pipe housing (130). The side wall of the air intake pipe housing (130) is provided with a first opening (132) communicating with the first intake passage (111) and a second opening (133) communicating with the second intake passage (112). The first opening (132) communicates with the annular passage (141) and defines the first gas output passage. The second opening (133) communicates with the annular passage (141) and defines the second gas output passage. The gas intake passage (121) extends radially along the air intake pipe housing (130) to connect with the annular passage (141).

4. The premixer according to claim 3, characterized in that, The air intake manifold shell (130) and the gas intake manifold shell (140) are an integral structure.

5. The premixer according to claim 3, characterized in that, The air intake pipe housing (130) includes a first air intake pipe housing (134) and a second air intake pipe housing (135). The second air intake pipe housing (135) can be detachably connected to the first air intake pipe housing (134). The partition (131) is disposed on the first air intake pipe housing (134), and the flap mechanism (200) is installed on the second air intake pipe housing (135).

6. The premixer according to claim 5, characterized in that, The first intake pipe shell (134) has a first notch (1341) and a second notch (1342) at the end near the air outlet of the air flow channel (110). An annular groove (1343) can be defined between the first intake pipe shell (134) and the gas intake pipe shell (140). When the second intake pipe shell (135) is installed on the first intake pipe shell (134), the second intake pipe shell (135) can cooperate with the first notch (1341) to define the first opening (132), cooperate with the second notch (1342) to define the second opening (133), and cooperate with the annular groove (1343) to define the annular flow channel (141).

7. The premixer according to claim 2, characterized in that, The flap mechanism (200) includes a cover plate (210) which is pivotally connected to the housing (100), and the pivot of the cover plate (210) is located at one end of the partition (131) near the air outlet channel (113), and the first air inlet channel (111) is located below the second air inlet channel (112).

8. The premixer according to claim 7, characterized in that, When the flap closes the first air intake channel (111) and the air outlet channel (113), the angle between the flap and the vertical plane is set to 12°-18°.

9. The premixer according to claim 1, characterized in that, The regulating valve (300) is an electric valve.

10. A premixed gas device, characterized in that, The premixer includes any one of claims 1-9.

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