Mixer turbulence structure, mixer and gas engine

Abstract

The utility model relates to the technical field of engines, and discloses a mixer turbulent flow structure, a mixer and a gas engine, the mixer turbulent flow structure comprises an annular shell and a column core, the column core is located in a space defined by the annular shell, and the column core and the annular shell are coaxially arranged; a plurality of turbulent flow blades are connected between the annular shell and the column core, the annular shell and the column core play a role in supporting the turbulent flow blades, and the turbulent flow blades are arranged around the column core so as to turbulent flow mixed gas of passing fuel gas and air in all directions, so that the mixing uniformity of the mixer is better; at least part of the turbulent flow blades spirally extend around the column core, the spirally-extending turbulent flow blades can enable mixed gas to form turbulent flow, turbulent flow pulsation kinetic energy is increased, the collision opportunity of air and fuel gas in the flowing process is increased, the mixing capacity is improved, and therefore the mixing uniformity of the mixed gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a mixer turbulence structure, a mixer and a gas engine. Background Art

[0002] The normal operation of a gas engine requires a uniform mixture of gas and air. If the mixture is not uniform, the amount of gas entering each cylinder will be inconsistent, which can easily lead to abnormal combustion, abnormal heat load, and detonation. Therefore, improving the uniformity of gas engine mixing is a key factor in ensuring engine performance.

[0003] In modern engines, a mixer is generally used to mix fuel gas and air. The mixed gas passes through the intake pipe and the intake manifold and then enters each cylinder of the engine. It can be seen that the mixer structure can directly affect the mixing effect on the mixing uniformity.

[0004] Among them, the mixer is a device that premixes the gas and fresh air in the intake pipe. Common mixers include the Venturi mixer. The Venturi mixer uses the principle of the Venturi effect, that is, when the fluid flows in the convergent nozzle, the velocity reaches the maximum value at the throat of the smallest cross-section of the pipe, so the dynamic pressure is the maximum and the static pressure is the minimum at this time. Since the gas outlet is at the throat, the gas enters the pipe due to the pressure difference. The mixed gas is the gas after the gas and air are mixed. The mixing uniformity indicates the degree of mixing of the gas and air at the same cross-section. The higher the mixing degree, the better the mixing uniformity, and the lower the mixing degree, the worse the mixing uniformity. The monitoring position of the mixing uniformity can be the part of the airway from the mixer to before entering the engine cylinder.

[0005] In the prior art solution, the mixed gas of the mixer turbulent blades on the outlet cross section is obviously unevenly distributed, and the gas stratification on the outlet cross section is very obvious and there are many stratifications. Utility Model Content

[0006] The utility model discloses a mixer turbulence structure, a mixer and a gas engine, which are used for improving the mixing uniformity of mixed gas.

[0007] In order to achieve the above object, the utility model provides the following technical solutions:

[0008] In a first aspect, a mixer turbulence structure is provided, which comprises: an annular shell and a column core, wherein the column core is located in a space surrounded by the annular shell and is coaxially arranged with the annular shell; a plurality of turbulence blades are connected between the annular shell and the column core, and the annular shell and the column core support the plurality of turbulence blades, and the plurality of turbulence blades are arranged around the column core to turbulently flow the passing mixture of gas and air in all directions, so that the mixing uniformity of the mixer is better; at least part of the turbulence blades extend spirally around the column core, and the spirally extended turbulence blades can make the mixture form turbulence, which is beneficial to increase the turbulent pulsation kinetic energy, increase the collision chance of air and gas during the flow process, improve the mixing ability, and thus improve the mixing uniformity of the mixture.

[0009] Optionally, each of the spoiler blades extends spirally around the cylindrical core.

[0010] Optionally, the spiral direction of each of the spoiler blades is the same.

[0011] Optionally, each of the spoiler blades protrudes toward the wind inlet side.

[0012] Optionally, the axial cross-section of the spoiler blade is in the shape of an arc.

[0013] Optionally, along the axial direction, projections of every two adjacent spoiler blades have no gap.

[0014] Optionally, along the axial direction, projections of every two adjacent spoiler blades partially overlap.

[0015] Optionally, the annular casing, the column core and the spoiler blades are integrally cast.

[0016] In a second aspect, a mixer is provided, which includes the mixer turbulence structure described in any of the above technical solutions, and a mixing ventilation duct for mixing gas and air, wherein the annular shell is fixed to the inner wall of the mixing ventilation duct.

[0017] Compared with the prior art, the mixer and the mixer spoiler structure have the same advantages, which will not be described in detail here.

[0018] In a third aspect, a gas engine is provided, which includes the mixer described in the above technical solution.

[0019] Compared with the prior art, the gas engine has the same advantages as the mixer, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of the mixer spoiler structure provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 A cross-sectional view of the mixer spoiler structure shown;

[0022] Figure 3 for Figure 1 The schematic diagram of the structure of the mixer spoiler structure hiding the annular housing 1;

[0023] Figure 4 for Figure 1 A schematic diagram of the positioning method of the curved blade 22 in the turbulent blade 2 in the mixer turbulent structure shown;

[0024] Figure 5 A cloud diagram showing the gas mass fraction distribution of the mixer turbulence structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Combination Figure 1 and Figure 2 The mixer turbulence structure provided in the embodiment of the present application comprises: an annular shell 1 and a column core 3, the column core 3 is located in the space surrounded by the annular shell 1 and is coaxially arranged with the annular shell 1; a plurality of turbulence blades 2 are connected between the annular shell 1 and the column core 3, the annular shell 1 and the column core 3 support the plurality of turbulence blades 2, the plurality of turbulence blades 2 are arranged around the column core 3 to turbulently flow the passing mixture of gas and air in all directions, so that the mixing uniformity of the mixer is better; at least part of the turbulence blades 2 extend spirally around the column core 3, and the spirally extended turbulence blades 2 can make the mixture form turbulence, which is beneficial to increase the turbulent pulsation kinetic energy, increase the collision chance of air and gas during the flow process, improve the mixing ability, and thus improve the mixing uniformity of the mixture.

[0027] In addition, by changing the inclination angle of the spoiler blade 2 and reducing the flow area, the flow velocity of the mixed gas can be increased, the lateral pulsation of the fluid is large, the mutual collision between the fluids is increased, and the kinetic energy of the turbulent pulsation is increased, which can promote the mixing of the gas and air, thereby enhancing the mixing effect.

[0028] refer to Figure 2 , installed at the bottom of the mixer, the gas and air are mixed and enter the mixer turbulence structure from side A, and after passing through the turbulence blades 2 and column core 3, they flow out from the end surface B.

[0029] In a specific embodiment, each spoiler blade 2 extends spirally around the column core 3. When all the spoiler blades 2 extend spirally around the column core 3, the turbulence of the mixed gas can be further enhanced, thereby improving the mixing uniformity of the mixed gas.

[0030] In a specific embodiment, the spiral direction of each spoiler blade 2 is the same, which can avoid the mixed gas output by the spoiler blades 2 with opposite spiral directions from canceling each other out, avoid weakening the mixing of air and gas, and ensure good mixing uniformity of the mixed gas.

[0031] In a specific embodiment, each spoiler blade 2 bulges toward the air inlet side, which is beneficial for the gas and air to have a more obvious turbulent effect under the impact of the convex side surface of the spoiler blade 2 after hitting the surface, and is beneficial for improving the mixing uniformity of the mixed gas.

[0032] In a specific embodiment, the axial L section of the spoiler blade 2 is in an arc shape. The arc-shaped section has a small pressure drop and can effectively improve the mixing uniformity of the mixed gas.

[0033] refer to Figure 3 The spoiler blade 2 includes an upper semi-cylindrical portion 21, a curved blade 22, a square column 23 and a lower semi-cylindrical portion 24 connected in sequence. The upper semi-cylindrical portion 21 and the lower semi-cylindrical portion 24 are conducive to reducing stress concentration. The square column 23 adjusts the outlet-side flow diversion direction of the airflow to be close to the axial direction L. The radius of the lower semi-cylindrical portion 24 and the upper semi-cylindrical portion 21 can be 1.5mm to 2.5mm, specifically 1.5mm, 1.8mm, 2mm, 2.3mm and 2.5mm, etc. The side length of the square column 6 is twice the radius of the lower semi-cylindrical portion 24 and the upper semi-cylindrical portion 21. The angle and positioning method of the curved blade 22 can be referred to Figure 4 , wherein the longitudinal dotted line represents the axis of the column core 3, and the transverse dotted line represents the symmetrical section of the column core 3, but, Figure 4 The data in the figure are only exemplary, and the curvature of the outer edge 2a and the inner edge 2b of the curved blade 22 is not limited to Figure 4 , and a certain degree of adjustment can also be made.

[0034] In a specific embodiment, along the axial direction L, there is no gap between the projections of each two adjacent spoiler blades 2, Figure 2 The direction P of the airflow ensures that the airflow cannot directly pass through the two adjacent spoiler blades 2 along the axial direction L, but must first collide with the spoiler blade 2 along the axial direction L and move at least a certain distance laterally before passing through the above two spoiler blades 2, which is beneficial to improving the mixing effect of air and gas and improving the mixing uniformity of the mixed gas.

[0035] In a specific embodiment, along the axial direction L, the projections of every two adjacent spoiler blades 2 partially overlap, and the overlapping portion of the projections is beneficial to improving the mixing path of air and gas and improving the mixing uniformity of the mixed gas.

[0036] In a specific embodiment, the annular housing 1, the column core 3 and the spoiler blades 2 are integrally cast, which is conducive to reducing assembly errors, reducing process steps and reducing costs. The material used for casting can be steel or other materials that meet the structural strength requirements.

[0037] refer to Figure 5 The mixing uniformity CFD calculation of the mixer spoiler structure provided in the embodiment of the present application is performed. Compared with the existing structure, the mixer spoiler structure provided in the embodiment of the present application can significantly improve the gas mixing uniformity. Under the same boundary strip, the mixing uniformity on the outlet cross section is good, no obvious uneven area appears, and the gas stratification on the outlet cross section is not obvious, with less stratification, and its mixing uniformity is 0.971, which can be improved by 6.23% over the existing solution.

[0038] Based on the same concept, the embodiment of the present application also provides a mixer, which includes the mixer turbulence structure provided in the above embodiment, and a mixing ventilation duct for mixing gas and air, and the annular housing 1 is fixed to the inner wall of the mixing ventilation duct. The effect of the mixer can refer to the effect analysis of the mixer turbulence structure.

[0039] Based on the same concept, the embodiment of the present application further provides a gas engine, which includes the mixer provided in the above embodiment. The effect of the gas engine can refer to the effect analysis of the mixer.

[0040] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A mixer spoiler structure, characterized in that: include: An annular shell and a column core, wherein the column core is located in a space surrounded by the annular shell and is coaxially arranged with the annular shell; A plurality of spoiler blades are connected between the annular housing and the column core, and the plurality of spoiler blades are arranged around the column core; At least part of the spoiler blades extend helically around the cylindrical core.

2. The mixer spoiler structure according to claim 1, characterized in that: Each of the spoiler blades extends spirally around the cylindrical core.

3. The mixer spoiler structure according to claim 2, characterized in that: The spiral direction of each spoiler blade is the same.

4. The mixer spoiler structure according to claim 2, characterized in that: Each spoiler blade protrudes toward the wind inlet side.

5. The mixer spoiler structure according to claim 4, characterized in that: The axial cross section of the spoiler blade is in an arc shape.

6. The mixer spoiler structure according to claim 2, characterized in that: Along the axial direction, there is no gap between the projections of every two adjacent spoiler blades.

7. The mixer spoiler structure according to claim 6, characterized in that: Along the axial direction, projections of every two adjacent spoiler blades partially overlap.

8. The mixer spoiler structure according to claim 7, characterized in that: The annular housing, the column core and the spoiler blades are integrally cast.

9. A mixer, characterized in that: It comprises the mixer turbulence structure according to any one of claims 1 to 8, and a mixing ventilation duct for mixing gas and air, wherein the annular shell is fixed to the inner wall of the mixing ventilation duct.

10. A gas engine, characterized in that: Comprising the mixer as claimed in claim 9.

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