Double-helix airflow mixer and application thereof

Abstract

The invention provides a double-helix airflow mixer which comprises an inner ring area and an outer ring area, the inner ring area comprises a plurality of inner ring blade arrays, each inner ring blade array comprises a plurality of inner ring guide blades, airflow channels exist between the inner ring guide blades, and the extending directions of the airflow channels on the same inner ring blade array are the same; the extending directions of airflow channels among the multiple inner ring blade arrays are different, and the airflow channels are used for mixing airflow into first spiral airflow; the outer ring area comprises a plurality of outer ring blade arrays and outer ring flow blocking blades, each outer ring blade array comprises a plurality of outer ring flow guide blades, airflow channels exist between the outer ring flow guide blades, the extending directions of the airflow channels on the same outer ring blade array are the same, and the extending directions of the airflow channels between the outer ring blade arrays are different; the second spiral air flow is opposite to the spiral direction of the first spiral air flow; the outer-ring flow blocking blades are arranged on the two opposite sides of each outer-ring blade array in the mode that included angles are formed between the outer-ring flow guiding blades and the outer-ring flow blocking blades.

Description

Technical Field

[0001] The present invention relates to the field of flow mixers and air flow mixers, and in particular to a double-helix air flow mixer and applications thereof. Background Art

[0002] Among the experimental methods for cooling and heating of unit air conditioners, the air enthalpy difference method is often used by various manufacturers to conduct rapid inspection and testing of products due to its advantages of low investment and fast measurement. The laboratory built on this basis is the enthalpy difference room. The air enthalpy difference method measures the enthalpy difference between the refrigerant side and the wind side respectively, and calculates the cooling and heating on both sides. Generally, the relative error between the two is required to be no more than 5%, and the experimental results are considered reliable.

[0003] However, due to differences in the design of air mixing and measuring equipment, the air capacity measurement may exceed the allowable error, resulting in erroneous test results. Therefore, accurately measuring the heat transfer capacity of air conditioning heat exchangers and air heat exchangers not only helps in the design and manufacture of heat exchange samples, but also avoids energy waste caused by repeated measurements due to measurement errors.

[0004] In order to avoid erroneous test results caused by uneven temperature on the air side, an air mixer is usually installed in front of the air sampling device. After mixing, the sampled air can represent the average state of the air after heat exchange.

[0005] Therefore, it is critical to develop a mixer that can meet the requirements of different air volumes, different mixing temperature distributions, and has good mixing effects, high mixing efficiency and low resistance. Summary of the invention

[0006] In view of this, in order to at least partially solve at least one of the above-mentioned technical problems, the present disclosure provides a double-helix airflow mixer and application thereof.

[0007] According to an embodiment of one aspect of the present disclosure, a double-helix airflow mixer is provided, comprising:

[0008] The inner ring region includes a plurality of inner ring blade arrays, wherein each inner ring blade array includes a plurality of inner ring guide blades with air flow channels between each other, the air flow channels on the same inner ring blade array extend in the same direction, and the air flow channels between the plurality of inner ring blade arrays extend in different directions, and are used to mix the air flows passing through the plurality of inner ring blade arrays into a first spiral air flow;

[0009] The outer ring region includes a plurality of outer ring blade arrays and outer ring flow blocking blades, wherein each outer ring blade array includes a plurality of outer ring guide blades with air flow channels between them, the air flow channels on the same outer ring blade array extend in the same direction, and the air flow channels between the plurality of outer ring blade arrays extend in different directions, and are used to mix the airflow passing through the plurality of outer ring blades into a second spiral airflow having a spiral direction opposite to that of the first spiral airflow;

[0010] The outer ring baffle blades are arranged at opposite sides of each outer ring blade array in a manner of forming an angle with the outer ring guide blades.

[0011] According to an embodiment of another aspect of the present disclosure, there is provided an application of a double-helix airflow mixer as an airflow mixing device in enthalpy difference measurement.

[0012] According to the embodiments of the present disclosure, the airflow is divided into two parts for mixing through the inner circle area and the outer circle area of ​​the mixer, and two reverse spiral airflows are formed by the inner circle blade array and the outer circle blade array, so that the airflow is fully mixed after passing through the mixer. When facing different temperature distribution patterns, the mixing efficiency can be maintained above 90%, and the maximum relative error is only 1.8%. It has a high mixing efficiency value and effectively reduces the mixing pressure drop, so that a good mixing effect can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0014] Figure 1 It is a front view of a double-helix air flow mixer according to an embodiment of the present invention;

[0015] Figure 2 This is a test diagram of a double-helix airflow mixer according to an embodiment of the present invention;

[0016] Figure 3 A three-dimensional schematic diagram of a double-helix airflow mixer according to an embodiment of the present invention;

[0017] Figure 4 Schematic diagram of characteristic dimensions of a double-helix airflow mixer according to an embodiment of the present invention;

[0018] Figure 5 This is a comparison diagram of the mixed flow outlet temperature cloud diagram of the outer ring baffle blade in an embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram of the blade structure of an embodiment of the present invention;

[0020] Figure 7 This is a diagram showing the relationship between the blade structure and the airflow area in an embodiment of the present invention;

[0021] Figure 8 It is a schematic diagram of a structural optimization scheme of a double-helix airflow mixer according to an embodiment of the present invention;

[0022] Fig. 9 This is a test result diagram of the structural optimization scheme of an embodiment of the present invention;

[0023] Fig.10 This is a schematic diagram of a test bench for testing a flow mixer according to an embodiment of the present invention;

[0024] Fig.11 This is a schematic diagram of the arrangement of thermocouples of a flow mixer test bench according to an embodiment of the present invention;

[0025] Fig.12 This is a schematic diagram of the temperature mode of a flow mixer test bench according to an embodiment of the present invention;

[0026] Fig.13 A schematic diagram of the structure of multiple mixers according to an embodiment of the present invention;

[0027] Fig.14 A diagram showing test results of structures of multiple mixers according to an embodiment of the present invention;

[0028] In the attached picture:

[0029] 1-Double helix air flow mixer;

[0030] 2-Inner circle area;

[0031] 3- Outer ring area;

[0032] 4-Outer ring baffle blades;

[0033] 5-Partition baffle;

[0034] 6- bending part;

[0035] 7-vertical part;

[0036] 9-Electric heater

[0037] 10- Air duct;

[0038] 11- mixed flow pipe section;

[0039] 12-Thermocouple network;

[0040] 13- mixer to be tested;

[0041] 14-wind receiving chamber body;

[0042] 15-static pressure hole;

[0043] 16- Air duct connection;

[0044] 17-Differential pressure transmitter. DETAILED DESCRIPTION

[0045] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0046] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The term "comprising" used herein indicates the existence of features, steps, operations, but does not exclude the existence or addition of one or more other features.

[0047] In the case of using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, or C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0048] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present disclosure.

[0049] In the process of realizing the concept of the present disclosure, it is found that there are many types of mixers, which can be divided into static mixers and dynamic mixers according to the mixing principle. A static mixer is a mixer that does not require external energy input during the mixing process. Through a special internal structure, the fluid is fully mixed when passing through the mixer and its pipeline, thereby achieving a uniform mixing effect. It is suitable for mixing low-viscosity fluids. The mixers used in enthalpy difference chambers are mainly static mixers, but the existing standards currently only describe whether mixing is required and the method of using mixers, but do not clarify the relevant requirements, and related research does not require the details of the mixer. Therefore, it is necessary to design an efficient mixer as a benchmark product to supplement relevant standards and research.

[0050] At present, in the research and design of mixers, mixers with higher mixing efficiency have the problems of complex structure and long mixing distance. In actual use, they are not conducive to processing and manufacturing, and the mixing distance is often limited, and the mixing effect cannot be guaranteed; mixers with simpler structures often only have a good mixing effect for a certain type of temperature distribution mode, and cannot be applied to changes in the mixed flow temperature distribution caused by changes in air volume or changes in heat exchange samples. Therefore, it is necessary to optimize the design based on the existing mixer so that it can have a good mixing efficiency for different air flow temperature distributions under the condition of a short mixing distance, and the structure needs to be easy to process and manufacture.

[0051] Figure 1 It is a front view of a double-helix air flow mixer according to an embodiment of the present invention; Figure 2 This is a test diagram of a double-helix airflow mixer according to an embodiment of the present invention; Figure 3 A three-dimensional schematic diagram of a double-helix airflow mixer according to an embodiment of the present invention; Figure 4 Schematic diagram of characteristic dimensions of a double-helix airflow mixer according to an embodiment of the present invention.

[0052] Specifically, according to an embodiment of one aspect of the present disclosure, Figure 1~Figure 4 As shown, a double-helix airflow mixer 1 is provided, comprising:

[0053] The inner ring region 2 includes a plurality of inner ring blade arrays, wherein each inner ring blade array includes a plurality of inner ring guide blades with air flow channels between each other, the air flow channels on the same inner ring blade array extend in the same direction, and the air flow channels between the plurality of inner ring blade arrays extend in different directions, and are used to mix the air flows passing through the plurality of inner ring blade arrays into a first spiral air flow;

[0054] The outer ring region 3 includes a plurality of outer ring blade arrays and outer ring flow blocking blades 4, wherein each outer ring blade array includes a plurality of outer ring guide blades with air flow channels between them, the air flow channels on the same outer ring blade array extend in the same direction, and the air flow channels between the plurality of outer ring blade arrays extend in different directions, and are used to mix the airflow passing through the plurality of outer ring blades into a second spiral airflow having a spiral direction opposite to that of the first spiral airflow;

[0055] The outer ring baffle blades 4 are arranged at opposite sides of each outer ring blade array in a manner of forming an angle with the outer ring guide blades.

[0056] According to an embodiment of the present invention, the inner circle blade array refers to a group of blades arranged in an array, and their main function is to guide and control the flow of airflow; the inner circle guide blade refers to a single blade constituting the inner circle blade array, and there is an airflow channel between them, which is used to guide the flow direction of the airflow. The extension direction of the blades on each inner circle blade array is the same, which can be understood as the inclination direction of the blades in the same inner circle blade array is the same, and it can also be understood as the blades in the same inner circle blade array have the same inclination angle in the same direction.

[0057] Furthermore, the different extension directions of the airflow channels between the multiple inner circle blade arrays means that the inclination direction or inclination angle of the blades of each inner circle blade array is different from that of the other inner circle blade arrays. Furthermore, the first spiral airflow refers to the spiral airflow formed by mixing the airflows through the multiple inner circle blade arrays. The formation of this airflow is due to the different extension directions of the airflow channels of different inner circle blade arrays, which causes the airflow to rotate and mix when passing through these channels, and finally forms a spiral airflow.

[0058] In some specific embodiments of the present invention, Figure 1 The arrow in the middle represents the orientation of the blades. The orientation of the blades in each inner circle blade array can be arranged clockwise or counterclockwise.

[0059] According to an embodiment of the present invention, the outer ring blade array refers to a group of blades arranged in an array, and their main function is to guide and control the flow of airflow; the outer ring guide blade refers to a single blade constituting the outer ring blade array, and there is an airflow channel between them, which is used to guide the flow direction of the airflow. The extension direction of the blades on each outer ring blade array is the same, which can be understood as the inclination direction of the blades of the same outer ring blade array is the same, and it can also be understood as the blades of the same outer ring blade array have the same inclination angle in the same direction.

[0060] Furthermore, the different extension directions of the airflow channels between the multiple outer blade arrays refer to the inclination direction or inclination angle of the blades of each outer blade array being different from those of the other outer blade arrays. The second spiral airflow refers to the spiral airflow formed by mixing the airflows of the multiple outer blade arrays. The formation of this airflow is due to the different extension directions of the airflow channels of different outer blade arrays, which causes the airflows to rotate and mix when passing through these channels, and finally forms a spiral airflow.

[0061] The outer ring baffle blades 4 are arranged at opposite sides of each outer ring blade array in a manner of forming an angle with the outer ring guide blades.

[0062] According to an embodiment of the present invention, the outer ring baffle blades 4 are arranged on the opposite sides of each outer ring blade array, and can form the airflow into a second spiral airflow together with the outer ring blade arrays in the outer ring area. Since the span between the outer ring blade arrays is larger, unlike the inner ring blade arrays which are closely adjacent to each other, the outer ring baffle blades 4 can enhance the mixing effect of the outer ring area, thereby forming a second spiral airflow that can be evenly mixed with the first spiral airflow.

[0063] Figure 5 It is a comparison diagram of the mixed flow outlet temperature cloud diagram of the outer ring baffle blade according to the embodiment of the present invention.

[0064] according to Figure 5 It can be seen that after adding the outer ring baffle blade 4, the temperature of the air flow passing through the double-helix airflow mixer can be more uniform. According to the temperature cloud map comparison chart, it can be seen that the temperature difference between hot and cold is smaller, achieving a better mixing effect and a higher mixing efficiency. At the same time, the mixing of the two spiral airflows can be seen.

[0065] In some specific embodiments of the present invention, Figure 1 As shown by the middle arrow, it represents the extension direction of the airflow channel, or it can be understood as the orientation of the blades. The extension direction of the airflow channel of each outer ring blade array can be arranged clockwise or counterclockwise, and the extension direction of the airflow channel of each inner ring blade array can be in the opposite direction of the arrangement of the inner ring blade array.

[0066] Furthermore, by setting the extension directions of the airflow channels of the outer blade array and the inner blade array in opposite directions, the inner blade array and the outer blade array can form two opposite spiral airflows, so that the airflow passing through the mixer can be mixed more fully and evenly.

[0067] According to an embodiment of the present invention, the airflow is divided into two parts for mixing through the inner circle area and the outer circle area of ​​the mixer, and two reverse spiral airflows are formed by the inner circle blade array and the outer circle blade array, so that the airflow is fully mixed after passing through the mixer. When facing different temperature distribution patterns, the mixing efficiency can be maintained above 90%, and the maximum relative error is only 1.8%.

[0068] According to an embodiment of the present invention, the partition baffle 5 is used to separate each inner ring blade array.

[0069] In some embodiments of the present invention, partition baffles 5 are disposed between each inner ring blade array and on the outer periphery of the entire inner ring area 3 .

[0070] According to an embodiment of the present invention, the partition baffle 5 is arranged between each inner circle blade array to separate each inner circle blade array, and at the same time, the airflow in each array can be independently controlled, thereby improving the accuracy and efficiency of airflow mixing. By separating each blade array, the partition baffle helps to form a more complex airflow flow pattern between different arrays, which can enhance the mixing effect of the airflow, making the formation of the first spiral airflow more uniform and stable. At the same time, the partition baffle can optimize the distribution of the airflow in the blade array, reduce the turbulence and loss of the airflow, and improve the efficiency and performance of the entire system.

[0071] Figure 6 It is a schematic diagram of the blade structure of an embodiment of the present invention.

[0072] According to an embodiment of the present invention, Figure 6 As shown, each blade in the plurality of inner blade arrays and the plurality of outer blade arrays has a vertical portion 6 and a bent portion 7, wherein the bent portion is arranged downstream of the vertical portion in the airflow inlet direction; and

[0073] The vertical portion is configured to extend in an air intake direction;

[0074] The bent portion is arranged at a first inclination angle in the air intake direction of the airflow.

[0075] According to an embodiment of the present invention, the flow area of ​​the mixer can be enlarged by arranging the vertical portion 6 and the bent portion 7, which can effectively reduce the mixed flow pressure drop. At the same time, when the structure of the mixer changes, the blade spacing can be changed without changing the thickness of the mixer due to the design of the bent blades. The thickness of the mixer remains unchanged, and the structure of the outer ring baffle blades remains unchanged, so the function of the outer ring baffle blades 4 remains consistent before and after.

[0076] In some specific embodiments of the present invention, Figure 4 As shown in the characteristic schematic diagram, in the orthographic projection of each blade in the direction of the blade array, the projection widths of the bent portion 6 and the vertical portion 7 are the same, and the spacing between the two adjacent blades is the same.

[0077] According to an embodiment of the present invention, in the orthographic projection of each blade in the direction of the blade array, the width of the projection of the bending portion 6 and the vertical portion 5 is respectively Figure 4 D1 and D2 in the figure, the distance between two adjacent leaves is D3.

[0078] Figure 7 This is a diagram showing the relationship between the blade structure and the airflow area according to an embodiment of the present invention.

[0079] According to an embodiment of the present invention, according to Figure 7 It can be seen that when the blade structure D1 and D2 are changed and the distance between two adjacent blades, i.e. D3, is changed, when the blade arrangement distance D3 is kept consistent with D1, the mixing efficiency can be kept constant, but because the blades are bent, the flow area of ​​the mixer becomes larger, which can effectively reduce the mixed flow pressure drop. Combined with the influence of the thickness of the mixing blade, D1 and D3 are kept consistent, and the distance D3 between two adjacent blades of the mixer is used as a variable, D1 and D3 that maximize the flow area can be obtained.

[0080] Preferably, according to Figure 7 It can be seen that the optimal flow area percentage is about D1(D3)=0.036Dh (18mm), which is about 45.53%, while it is 45.03% when D1(D3)=0.05Dh(25mm). The difference between the two is only 1.1%. Considering lightweight and processing convenience, the final design size of D1 and D3 is 0.05Dh.

[0081] Figure 8 It is a schematic diagram of a structural optimization scheme of a double-helix airflow mixer according to an embodiment of the present invention; Fig. 9 This is a test result diagram of the structural optimization solution of an embodiment of the present invention.

[0082] exist Figure 8 Among them, optimize plan A (including plan A1~A7), plan B (including plan B1~B7), plan X (including plan X1~X5), plan Y (including plan Y1~Y3) and plan Z (including plan Z1~Z3).

[0083] In some specific embodiments of the present invention, the first inclination angle α is in the range of 30° to 60°.

[0084] According to some specific embodiments of the present invention, all blades in the double-helix airflow mixer 1 have the same structure.

[0085] According to an embodiment of the present invention, Figure 8 As shown in FIG. 1 , by only changing the first inclination angle α, the mixing efficiency of the measuring mixer can be kept high. Fig. 9 shown.

[0086] according to Fig. 9 It can be seen that a higher mixing efficiency can be achieved by changing the first inclination angle α of the inner and outer ring blades within the range of 30°~60°.

[0087] Preferably, after the first inclination angle α of the blade exceeds 45°, the mixed flow efficiency no longer changes significantly, and 45° is a more optimal first inclination angle of the blade.

[0088] According to an embodiment of the present invention, the included angle β of the outer ring baffle blade 4 is set at 40°~45° in the airflow inlet direction.

[0089] According to the embodiment of the present invention, by only changing the angle of the outer ring guide vane 4, the measuring mixer can maintain a high mixing efficiency. Fig. 9 shown.

[0090] according to Fig. 9 It can be seen that when the angle β of the outer ring guide vane 4 is set within the range of 40° to 45° in the air intake direction, the double-helix airflow mixer can achieve good mixing efficiency.

[0091] Preferably, when the included angle β of the outer ring guide vanes 4 exceeds 45°, the flow mixing efficiency no longer changes significantly, and 45° is a relatively optimal included angle of the outer ring guide vanes 4 .

[0092] In some specific embodiments of the present invention, the flow mixer is square in the orthographic projection of the airflow inlet direction.

[0093] According to an embodiment of the present invention, the double-helix airflow mixer may be configured as a square or a rectangle, wherein the width Dh of the mixer refers to the side length of the square or the shorter side length of the rectangle.

[0094] According to an embodiment of the present invention, the length of each blade in the plurality of outer ring blade arrays is 0.2 to 0.3 times the width of the mixer.

[0095] According to an embodiment of the present invention, the length of each blade in the plurality of inner ring blade arrays is 0.1 to 0.3 times the width of the mixer.

[0096] According to the embodiment of the present invention, the length of each blade in the outer blade array is the outer characteristic dimension Dy, and the length of each blade in the inner blade array is the inner characteristic dimension Dn. If the inner structure Dn of the mixer is changed, Dy will change accordingly. The result is as follows: Fig. 9 shown.

[0097] Preferably, according to Fig. 9It can be seen that when Dn=0.3Dh (150mm), the mixer has a higher mixing efficiency. 0.3Dh is the optimal structural parameter of the inner ring of the mixer.

[0098] According to an embodiment of the present invention, the thickness of the mixing body in the airflow inlet direction is 0.2 to 0.3 times the width of the mixer.

[0099] According to an embodiment of the present invention, Figure 8~Figure 9 As shown, the structure of the mixer thickness Dt was optimized, and it was found that when Dt was reduced to be equal to D1, D2=0, and the mixing efficiency would decrease. Therefore, Dt was no longer changed and Dt=0.1Dh was maintained.

[0100] More preferably, the characteristic dimensions of the double-helix airflow mixer are Dt=0.1Dh, D1=D2=D3=0.05Dh, Dn=0.3Dh, Dy=0.2Dh, and α=β=45°.

[0101] As another aspect of the embodiment of the present invention, it also includes the application of the double-helix airflow mixer as an airflow mixing device in enthalpy difference measurement.

[0102] According to the embodiments of the present invention, the double-helix airflow mixer of the present invention has a high mixing efficiency, which can reach 90%, and the relative error is only about 1%. It maintains a high mixing efficiency under different air volumes and different mixing temperature distribution modes, and at the same time, the mixing pressure drop is low, which can meet the requirements that the enthalpy difference chamber mixer has a good mixing effect under different air volumes and different mixing temperature distribution conditions.

[0103] Fig.10 This is a schematic diagram of a test bench for testing a flow mixer according to an embodiment of the present invention; Fig.11 This is a schematic diagram of the arrangement of thermocouples of a flow mixer test bench according to an embodiment of the present invention; Fig.12 Schematic diagram of the temperature mode of the mixer test bench according to an embodiment of the present invention.

[0104] According to an embodiment of the present invention, the mixing efficiency is measured by Figure 10~Figure 12 The mixer structure test bench shown in the figure is used for measurement. Fig. 9 Thermocouples are arranged as shown to measure and calculate the enthalpy difference. Fig.10 The mixing efficiency is tested in various temperature modes. Figure 8 The device shown is tested, the air flow is heated by the electric heater 9 and then enters the mixed flow section 11 through the air duct 10. Thermocouple networks 12 are provided at both ends of the mixed flow section 11 to measure the inlet and outlet temperatures of the mixed flow section 11. The mixer 13 to be tested is arranged downstream of the thermocouple network 12 at the air inlet of the mixed flow section 11.

[0105] Fig.13 A schematic diagram of the structure of multiple mixers according to an embodiment of the present invention; Fig.14 1 is a diagram showing test results of the structures of multiple mixers according to an embodiment of the present invention.

[0106] exist Fig.13 Among them, structures 1 to 4 are comparative mixer structures, structures 5 to 8 are double-helix airflow mixers, wherein structure 5 is a comparative example in which no outer ring baffle blades are set, and structures 6 to 8 are double-helix airflow mixers of the present invention in which outer ring baffle blades are set.

[0107] according to Fig.14 It can be seen that the double-helix airflow mixers provided in the present invention have a high flow mixing efficiency, can effectively reduce the flow mixing pressure drop, and have a good flow mixing effect.

[0108] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A double-helix air flow mixer, comprising: The inner ring region includes a plurality of inner ring blade arrays, wherein each of the inner ring blade arrays includes a plurality of inner ring guide blades with air flow channels between each other, the air flow channels on the same inner ring blade array extend in the same direction, and the air flow channels between the plurality of inner ring blade arrays extend in different directions, and are used to mix the air flows passing through the plurality of inner ring blade arrays into a first spiral air flow; The outer ring region includes a plurality of outer ring blade arrays and outer ring flow blocking blades, wherein each of the outer ring blade arrays includes a plurality of outer ring guide blades with air flow channels between them, the air flow channels on the same outer ring blade array have the same extension direction, and the air flow channels between the plurality of outer ring blade arrays have different extension directions, and are used to mix the airflow passing through the plurality of outer ring blades into a second spiral airflow having a spiral direction opposite to that of the first spiral airflow; The outer ring baffle blades are arranged at opposite sides of each outer ring blade array in a manner of forming an angle with the outer ring guide blades.

2. The flow mixer according to claim 1, wherein: Also includes: A partition baffle is used to separate each of the inner ring blade arrays.

3. The flow mixer according to claim 1, wherein: Each blade in the plurality of inner blade arrays and the plurality of outer blade arrays has a vertical portion and a bent portion, wherein the bent portion is arranged downstream of the vertical portion in the airflow intake direction; and The vertical portion is configured to extend toward the air intake direction; The bent portion is arranged at a first inclination angle in the air intake direction of the airflow.

4. The flow mixer according to claim 3, wherein: The included angle of the outer ring guide vane includes being set at 40° to 45° in the air intake direction of the airflow; The first inclination angle is in the range of 30° to 60°.

5. The flow mixer according to claim 3, wherein: In the orthographic projection of each blade in the direction of the blade array, the projection widths of the bent portion and the vertical portion are the same, and the interval between the bent portion and the vertical portion is the same as that of two adjacent blades.

6. The flow mixer according to claim 1, wherein: The mixer is square in the orthographic projection of the airflow inlet direction.

7. The flow mixer according to claim 6, wherein: The length of each blade in the plurality of outer ring blade arrays is 0.2 to 0.3 times the width of the mixer.

8. The flow mixer according to claim 6, wherein: The length of each blade in the plurality of inner ring blade arrays is 0.1 to 0.3 times the width of the mixer.

9. The flow mixer according to claim 7, wherein: The thickness of the mixing body in the air flow inlet direction is 0.2 to 0.3 times the width of the mixer.

10. Use of the double-helix airflow mixer according to any one of claims 1 to 9 as an airflow mixing device in enthalpy difference measurement.

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