High-power premixer

Abstract

The utility model provides a high-power premixer which comprises a shell, an inlet flange, a mixed flow inlet pipe, a fuel gas mixing device, a mixed flow outlet pipe and an outlet flange, the mixed flow inlet pipe is a reducing pipe, an annular first fixing plate is arranged at the outlet end of the mixed flow inlet pipe, the mixed flow outlet pipe is a diverging pipe, and the fuel gas mixing device is arranged in the shell. An annular second fixing plate is arranged at the inlet end of the mixed flow inlet pipe, the second fixing plate and the first fixing plate form an annular channel, the annular channel is communicated with the inner side and the outer side of the mixed flow inlet pipe and the inner side and the outer side of the mixed flow outlet pipe, and the fuel gas mixing device is arranged in the mixed flow outlet pipe. And the fuel gas mixing device is used for deeply mixing fuel gas and air at the joint of the mixed flow inlet pipe and the mixed flow outlet pipe. The utility model has the beneficial effects that air and gas are deeply mixed, the installation requirement is reduced, the installation is simple, and the like.

Description

Technical Field

[0001] The utility model relates to the field of evaporators, in particular to a high-power premixer. Background Art

[0002] The common premixing in China is the front premixing design, so the air and gas mixed by the premixer will enter the fan for further mixing. The front premixing design has relatively low requirements for the premixer, but the fan to be used is a full premixing explosion-proof fan. At present, the international research and development of full premixing explosion-proof fans has a power bottleneck and cannot achieve high power.

[0003] Therefore, in the current state, in order to realize the design and application of 8T / 10T and above premixed burners, post-premixing technology is generally adopted. For post-premixing technology, since its premixing position is set at the fan outlet, if the gas can enter the premixing chamber to mix with the air, the gas pressure is generally higher than the air pressure at this time. Therefore, under normal circumstances, the post-premixing design structure has a relatively high demand for gas. The applicant's premixer body adopts a Venturi design structure. When the air flows through the throat of the premixer at high speed, the flow rate increases and the pressure decreases, which can reduce the requirements for gas pressure to a certain extent. As the power of the premixed burner is further increased, the diameter of the Venturi throat will also be further enlarged. When the throat diameter reaches a certain degree, the gas in the premixing chamber is basically distributed in the outermost ring area of ​​the mixed gas. At this time, the flow rate is fast, and the air and gas are not well mixed and are pushed to the burner surface for combustion, resulting in low combustion efficiency and excessive carbon monoxide. At this time, it is necessary to adjust the corresponding design structure according to this situation to enhance the mixing effect of air and gas.

[0004] Therefore, it is necessary to provide a new technical solution. Utility Model Content

[0005] In order to solve the technical problems existing in the prior art, the utility model discloses a high-power premixer, and the specific technical solution is as follows:

[0006] The utility model provides a high-power premixer, comprising a shell, an inlet flange, a mixed flow inlet pipe, a gas mixing device, a mixed flow outlet pipe and an outlet flange.

[0007] The shell is a hollow tank with openings at both ends, and a gas inlet is provided on the shell.

[0008] The inlet flange is fixedly connected to the inlet end of the mixed flow inlet pipe, and the inlet flange is fixed to one end of the shell opening.

[0009] The outlet flange is fixedly connected to the outlet end of the mixed flow outlet pipe, and the outlet flange is fixed to the other end of the shell opening.

[0010] The mixed flow inlet pipe is a tapered pipe, and an annular first fixing plate is provided at the outlet end of the mixed flow inlet pipe.

[0011] The mixed flow outlet pipe is a gradually expanding pipe, and an annular second fixing plate is provided at the inlet end of the mixed flow outlet pipe. The second fixing plate and the first fixing plate form an annular channel, and the annular channel communicates the inner and outer sides of the mixed flow inlet pipe and the mixed flow outlet pipe.

[0012] The gas mixing device is arranged in the mixed flow outlet pipe, and the gas mixing device deeply mixes the gas and air at the connection between the mixed flow inlet pipe and the mixed flow outlet pipe.

[0013] Furthermore, the first fixing plate is formed by extending radially outward from the end of the mixed flow inlet pipe for a distance.

[0014] The second fixing plate includes a first connection portion extending radially outward from the end of the mixed flow outlet pipe for a distance and a second connection portion extending vertically outward from the edge of the first connection portion, the first connection portion is parallel to the first fixing plate, and the radial distance of the first connection portion is greater than the radial distance of the first fixing plate.

[0015] The first fixing plate and the second fixing plate form an annular channel with an L-shaped cross section.

[0016] Furthermore, the first fixing plate is provided with a supporting column and a positioning sheet.

[0017] The support columns are evenly arranged on a side of the first fixing plate opposite to the first connecting portion, and the support columns are in contact with the first connecting portion.

[0018] The positioning pieces are evenly arranged on the annular outer peripheral surface of the first fixing plate, and the positioning pieces are in contact with the second connecting portion.

[0019] Furthermore, the gas mixing device is a pipe body structure that transitions from a gradually expanding shape to a gradually contracting shape from the inlet end, the inlet end of the gas mixing device is connected to the outlet end of the mixed flow inlet pipe, and the outlet end of the gas mixing device is connected to the inlet end of the mixed flow outlet pipe.

[0020] Furthermore, the gas mixing device and the mixed flow outlet pipe are integrally formed.

[0021] Furthermore, a spoiler impeller is arranged on the outer side of the outlet flange, and a center hole is arranged at the center of the spoiler impeller.

[0022] Furthermore, the gas mixing device comprises a spindle-shaped main body and a connecting shaft,

[0023] The main body is hollow and has openings at both ends.

[0024] The connecting shaft passes through the main body from the openings at both ends of the main body, one end of the connecting shaft passes through the center hole on the outlet flange and is fixedly connected to the outlet flange, and the other end of the connecting shaft is fixedly connected to the inlet end of the mixed flow outlet pipe.

[0025] Clamping nuts are respectively arranged on the connecting shafts at both ends of the main body, and the clamping nuts limit the axial movement of the main body on the connecting shaft. The clamping nuts and the connecting shaft are connected by threads.

[0026] Furthermore, the outer side of the gradually expanding wall at the front end of the main body is parallel to the inner side of the wall of the mixed flow outlet pipe at the corresponding position.

[0027] The utility model has the following beneficial effects:

[0028] 1. The high-power premixer provided by the utility model adds a gradually expanding and contracting structure to the mixed flow outlet pipe, and further mixes the air-gas mixture in the outer ring of the mixing chamber through the gradually contracting structure, so that the air and gas can achieve a better mixing effect after flowing out of the second gradually contracting mixing section. In addition, the gradually expanding and contracting structure and the mixed flow outlet pipe are designed in an integrated manner, which reduces the number of parts and reduces the installation requirements. Under the current blister process, the processing and manufacturing of this special-shaped structure is not limited by technical and process bottlenecks.

[0029] 2. The high-power premixer provided by the utility model is provided with the main body of the spindle structure in the gradually expanding section of the mixed flow outlet pipe, and the air originally in the inner ring part of the mixing chamber is squeezed to the part where the outer ring gas is located, so that the air and gas are deeply mixed. The design utilizes the gradually widening and contracting structure of the spindle structure to maximize the reduction of fluid pressure loss while achieving enhanced air and gas mixing. At this time, the spindle is fixedly connected to the venturi outlet section spoiler impeller, and the installation is relatively simple.

[0030] 3. The high-power premixer provided by the utility model prevents the gas from entering the gas inlet directly from the throat, which causes uneven distribution of the throat gas in the circumferential direction. An L-shaped annular channel is added to the throat to increase the speed of the gas in a directional manner, so that the gas can enter deeper into the mixing chamber. At the same time, a support column and a positioning plate are added at the connection between the mixed flow inlet pipe and the mixed flow outlet pipe to ensure the concentricity of the two components and the gas channel area.

[0031] 4. The high-power premixer provided by the utility model adds a turbulent impeller at the outlet of the mixed flow outlet pipe to further mix the mixed gas.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a structural schematic diagram of a high-power premixer provided by an embodiment of the utility model.

[0035] Figure 2 The utility model is provided in one embodiment of the interface structure diagram of the first fixed plate and the second fixed plate at the throat of a high-power premixer.

[0036] Figure 3 It is a structural schematic diagram of a mixed flow inlet pipe in a high-power premixer provided by an embodiment of the utility model.

[0037] Figure 4 It is a structural schematic diagram of a mixed flow outlet pipe in a high-power premixer provided by an embodiment of the utility model.

[0038] Figure 5 A schematic cross-sectional view of a high-power premixer provided in another embodiment of the present invention.

[0039] Among them, 1. shell; 2. inlet flange; 3. mixed flow inlet pipe; 4. gas mixing device; 5. mixed flow outlet pipe; 6. outlet flange; 7. turbulent impeller; 11. gas inlet; 31. first fixing plate; 32. support column; 33. positioning sheet; 41. main body; 42. connecting shaft; 43. clamping nut; 51. second fixing plate; 52. first connecting part; 53. second connecting part. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The utility model provides a high-power premixer, referring to Figures 1 to 5 , comprising a shell 1, an inlet flange 2, a mixed flow inlet pipe 3, a gas mixing device 4, a mixed flow outlet pipe 5 and an outlet flange 6. The shell 1 is a hollow tank with openings at both ends, and a gas inlet 11 is provided on the shell 1. The inlet flange 2 is fixedly connected to the inlet end of the mixed flow inlet pipe 3, and the inlet flange 2 is fixed to one end of the opening of the shell 1. The outlet flange 6 is fixedly connected to the outlet end of the mixed flow outlet pipe 5, and the outlet flange 6 is fixed to the other end of the opening of the shell 1. The mixed flow inlet pipe 3 is a convergent pipe, and an annular first fixing plate 31 is provided at the outlet end of the mixed flow inlet pipe 3. The mixed flow outlet pipe 5 is a divergent pipe, and an annular second fixing plate 51 is provided at the inlet end of the mixed flow outlet pipe 5, and the second fixing plate 51 and the first fixing plate 31 form an annular channel, and the annular channel connects the inner and outer sides of the mixed flow inlet pipe 3 and the mixed flow outlet pipe 5. The gas mixing device 4 is disposed in the mixed flow outlet pipe 5 , and the gas mixing device 4 deeply mixes the gas and air at the connection between the mixed flow inlet pipe 3 and the mixed flow outlet pipe 5 .

[0044] In one embodiment, the first fixing plate 31 and the second fixing plate 51 are two annular plates parallel to each other, which are combined to form a strip-shaped annular gap.

[0045] In one embodiment, the first fixing plate 31 is formed by extending radially outward from the end of the mixed flow inlet pipe 3 for a distance. The second fixing plate 51 includes a first connecting portion 52 extending radially outward from the end of the mixed flow outlet pipe 5 for a distance and a second connecting portion 53 extending vertically outward from the edge of the first connecting portion 52, the first connecting portion 52 is parallel to the first fixing plate 31, and the radial distance of the first connecting portion 52 is greater than the radial distance of the first fixing plate 31. The first fixing plate 31 and the second fixing plate 51 form an annular channel with an L-shaped cross section.

[0046] In one embodiment, the first fixing plate 31 is provided with a support column 32 and a positioning piece 33. The support column 32 is evenly arranged on a side of the first fixing plate 31 opposite to the first connecting portion 52, and the support column 32 is in contact with the first connecting portion 52. The positioning piece 33 is evenly arranged on the annular outer peripheral surface of the first fixing plate 31, and the positioning piece 33 is in contact with the second connecting portion 53. The positioning piece 33 not only ensures the coaxiality of the mixed flow inlet pipe 3 and the mixed flow outlet pipe, but also controls the distance size of the annular channel.

[0047] In one embodiment, the gas mixing device 4 is a pipe structure that transitions from a gradually expanding shape to a gradually contracting shape from the inlet end, the inlet end of the gas mixing device 4 is connected to the outlet end of the mixed flow inlet pipe 3, and the outlet end of the gas mixing device 4 is connected to the inlet end of the mixed flow outlet pipe 5. The mixed gas is deeply mixed twice by the gradually expanding and contracting structure.

[0048] The gas mixing device 4 and the mixed flow outlet pipe 5 are integrally formed.

[0049] A turbulent impeller 7 is disposed outside the outlet flange 6 , and a central hole is disposed at the center of the turbulent impeller 7 . The turbulent impeller 7 further mixes the mixed gas at the outlet of the mixed flow outlet pipe 5 .

[0050] In one embodiment, the gas mixing device 4 includes a spindle-shaped main body 41 and a connecting shaft 42. The main body 41 is hollow and has openings at both ends. The connecting shaft 42 passes through the main body 41 from the openings at both ends of the main body 41, one end of the connecting shaft 42 passes through the center hole on the outlet flange 6 and is fixedly connected to the outlet flange 6, and the other end of the connecting shaft 42 is fixedly connected to the inlet end of the mixed flow outlet pipe 5. Clamping nuts 43 are respectively provided on the connecting shafts 42 at both ends of the main body 41, and the clamping nuts 43 limit the axial movement of the main body 41 on the connecting shaft 42, and the clamping nuts 43 and the connecting shaft 42 are connected by threads.

[0051] The outer side of the wall of the front end of the main body 41 is parallel to the inner side of the wall of the mixed flow outlet pipe 5 at the corresponding position, so that the air originally in the inner ring is squeezed to the position of the outer ring gas for deep mixing.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0053] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify and vary the above embodiments within the scope of the present invention.

Claims

1. A high-power premixer, characterized in that: It includes a shell, an inlet flange, a mixed flow inlet pipe, a gas mixing device, a mixed flow outlet pipe and an outlet flange. The shell is a hollow tank with openings at both ends, and a gas inlet is provided on the shell. The inlet flange is fixedly connected to the inlet end of the mixed flow inlet pipe, and the inlet flange is fixed to one end of the shell opening. The outlet flange is fixedly connected to the outlet end of the mixed flow outlet pipe, and the outlet flange is fixed to the other end of the shell opening. The mixed flow inlet pipe is a tapered pipe, and an annular first fixing plate is provided at the outlet end of the mixed flow inlet pipe. The mixed flow outlet pipe is a gradually expanding pipe, and an annular second fixing plate is provided at the inlet end of the mixed flow outlet pipe. The second fixing plate and the first fixing plate form an annular channel, and the annular channel communicates the inner and outer sides of the mixed flow inlet pipe and the mixed flow outlet pipe. The gas mixing device is arranged in the mixed flow outlet pipe, and the gas mixing device deeply mixes the gas and air at the connection between the mixed flow inlet pipe and the mixed flow outlet pipe.

2. The high-power premixer according to claim 1, characterized in that: The first fixing plate is formed by extending radially outward from the end of the mixed flow inlet pipe for a distance. The second fixing plate includes a first connection portion extending radially outward from the end of the mixed flow outlet pipe for a distance and a second connection portion extending vertically outward from the edge of the first connection portion, the first connection portion is parallel to the first fixing plate, and the radial distance of the first connection portion is greater than the radial distance of the first fixing plate. The first fixing plate and the second fixing plate form an annular channel with an L-shaped cross section.

3. The high-power premixer according to claim 2, characterized in that: The first fixing plate is provided with a supporting column and a positioning sheet. The support columns are evenly arranged on a side of the first fixing plate opposite to the first connecting portion, and the support columns are in contact with the first connecting portion. The positioning pieces are evenly arranged on the annular outer peripheral surface of the first fixing plate, and the positioning pieces are in contact with the second connecting portion.

4. The high-power premixer according to claim 1, characterized in that: The gas mixing device is a pipe structure with a transition from a gradually expanding shape to a gradually contracting shape from the inlet end. The inlet end of the gas mixing device is connected to the outlet end of the mixed flow inlet pipe, and the outlet end of the gas mixing device is connected to the inlet end of the mixed flow outlet pipe.

5. The high-power premixer according to claim 4, characterized in that: The gas mixing device and the mixed flow outlet pipe are integrally formed.

6. The high-power premixer according to claim 1, characterized in that: A spoiler is arranged on the outer side of the outlet flange, and a center hole is arranged at the center of the spoiler.

7. The high-power premixer according to claim 6, characterized in that: The gas mixing device comprises a spindle-shaped main body and a connecting shaft. The main body is hollow and has openings at both ends. The connecting shaft passes through the main body from the openings at both ends of the main body, one end of the connecting shaft passes through the center hole on the outlet flange and is fixedly connected to the outlet flange, and the other end of the connecting shaft is fixedly connected to the inlet end of the mixed flow outlet pipe. Clamping nuts are respectively arranged on the connecting shafts at both ends of the main body, and the clamping nuts limit the axial movement of the main body on the connecting shaft. The clamping nuts and the connecting shaft are connected by threads.

8. The high-power premixer according to claim 7, characterized in that: The outer side of the wall of the front end of the main body gradually expands and is parallel to the inner side of the wall of the mixed flow outlet pipe at the corresponding position.

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