A vortex tube based on helmholtz resonance excitation

Abstract

The present application belongs to the technical field of energy separation, and particularly relates to a vortex tube based on Helmholtz resonance excitation, comprising: an air inlet pipeline, a Helmholtz resonance structure is formed in the air inlet pipeline; a vortex tube body, an inlet nozzle is arranged on the vortex tube body, and an air outlet of the air inlet pipeline is communicated with the inlet nozzle; high-pressure gas firstly enters the air inlet pipeline, and under the action of the Helmholtz resonance structure in the air inlet pipeline, high-frequency oscillation gas flow is formed, and then the high-frequency oscillation gas flow is introduced into the vortex tube body through the inlet nozzle to separate energy to obtain cold and hot gas flows. The vortex tube based on Helmholtz resonance excitation provided by the present application introduces the high-frequency oscillation gas flow generated by the Helmholtz resonance cavity into the vortex tube, thereby effectively improving the energy separation performance and efficiency of the vortex tube.

Description

Technical Field

[0001] This invention belongs to the field of energy separation technology, specifically relating to a vortex tube, and more particularly to a vortex tube based on Helmholtz resonance excitation. Background Technology

[0002] A vortex tube is a device that separates compressed gas into two streams of gas, one hot and one cold. Its structure is simple and sophisticated, mainly consisting of an inlet nozzle, a vortex chamber, a separation structure (such as an orifice plate or cyclone separator), hot and cold outlets, and optional control valves. Vortex tubes offer advantages such as simple structure, no moving parts, low cost, easy adjustment, and no pollution. However, they also have disadvantages such as relatively low cooling efficiency, relatively high noise levels, and dependence on a high-pressure gas source. Generally, vortex tubes have few influencing factors for stable operation; as long as a high-pressure gas source is available, stable hot and cold gas streams can be produced instantly.

[0003] Currently, the low energy separation efficiency of vortex tubes has become a key bottleneck restricting their further development in the field of energy utilization. To improve the energy separation efficiency of vortex tubes, those skilled in the art have conducted numerous explorations. However, a review of previous research on vortex tube performance optimization techniques reveals that, due to a lack of fundamental understanding of the flow structure and energy separation mechanism of vortex tubes, most optimization methods are structural "fine-tuning" under conditions that do not fully conform to optimization criteria. Although these methods achieve slight performance improvements, they lack universal applicability.

[0004] Research by Xiangji Guo, Liu Bo, et al. indicates that the flow field inside a vortex tube oscillates periodically at a certain frequency, and the oscillation frequency of the flow field is closely positively correlated with the energy separation performance of the vortex tube (see Xiangji Guo, Liu Bo, Bo Zhang, et al. Analysis on the patterns of precessing frequency characteristics and energy separation processes in a Ranque-Hilsch vortextube[J]. International Journal of Thermal Science, 2021, 168: 107067.). Furthermore, since vortex tubes always produce a whistling sound during operation, some scholars believe that this sound signal is related to energy separation. They have demonstrated this by installing a silencer at the inlet of the vortex tube, showing that when the whistling sound in the flow field is suppressed at a certain frequency, the energy separation performance of the vortex tube is also limited (see Kurosaka M. Acoustic streaming in swirling flow and the Ranque-Hilsch (vortex tube) effect[J]. Journal of Fluid Mechanics, 1982, 124: 1173-1198.). Furthermore, patents with publication numbers RU2114358C1 and CN116734497A, among others, disclose improved methods for vortex tubes based on sound, pressure, and other factors that can induce fluid oscillations. It is inferred that the energy separation performance of vortex tubes may be related to the oscillation characteristics of the flow field within the vortex tube.

[0005] Furthermore, the Helmholtz resonant cavity is a device that can generate high-frequency oscillations in a flow field. High-speed jets flow into and out of a closed pipe one end, thereby generating high-frequency vibrations in the flow field and propagating downstream. So, if the high-frequency oscillating airflow generated by the Helmholtz resonant cavity is introduced into the vortex tube, will it have a beneficial effect on improving the energy separation performance of the vortex tube?

[0006] Through research, this invention proposes a vortex tube based on Helmholtz resonance excitation, which combines the Helmholtz resonance cavity with the vortex tube to provide an improved vortex tube with higher cooling efficiency and suitable for widespread application. Summary of the Invention

[0007] The purpose of this invention is to address the aforementioned technical problems by providing a vortex tube based on Helmholtz resonance excitation that offers higher cooling efficiency and is suitable for widespread application.

[0008] In view of this, the present invention provides a vortex tube based on Helmholtz resonance excitation, comprising:

[0009] An intake duct, within which a Helmholtz resonance structure is formed;

[0010] The vortex tube body is provided with an inlet nozzle, and the outlet of the air inlet pipe is connected to the inlet nozzle;

[0011] High-pressure gas first enters the intake pipe, where it forms a high-frequency oscillating airflow under the action of the Helmholtz resonance structure. Then, the high-frequency oscillating airflow is introduced into the vortex tube body through the inlet nozzle for energy separation to obtain two airflows: a cold airflow and a hot airflow.

[0012] Furthermore, a resonant tube is installed inside the intake pipe. The resonant tube is a pipe that is closed at one end and open at the other end, and a Helmholtz resonant cavity is formed between the inner wall of the resonant tube and the outer wall of the intake pipe.

[0013] High-pressure gas first enters the resonant tube and is compressed. The compressed gas comes into contact with the wall of the resonant tube and then returns and expands outward, thereby causing lateral deflection of the high-pressure gas and flow field vibration, generating high-frequency oscillating airflow. After the high-frequency oscillating airflow returns from the resonant tube, it enters the Helmholtz resonant cavity, where the flow field frequency is ≥5.7KHz.

[0014] Furthermore, the resonant tube is mounted and fixed inside the Helmholtz resonant cavity by a first fixing bracket.

[0015] Furthermore, along the airflow direction, the following are sequentially arranged inside the air intake pipe:

[0016] The air inlet is a gas passage with a constant cross-section;

[0017] The first converging nozzle is a gas channel whose cross-section gradually decreases along the flow direction of the airflow.

[0018] The air inlet is connected to the first tapered nozzle, and the resonant tube is located at the rear end of the first tapered nozzle, forming a folded gas outlet between the open end of the resonant tube and the rear end of the first tapered nozzle.

[0019] In use, external high-pressure gas first enters the air intake pipe through the air inlet, then enters the first tapered nozzle, and after being accelerated and pressurized by the first tapered nozzle, it forms a high-speed jet and enters the resonant tube.

[0020] Furthermore, the intake pipe is equipped with:

[0021] The second tapering nozzle is a gas channel whose cross-section gradually decreases along the flow direction of the airflow; the second tapering nozzle is located at the rear end of the Helmholtz resonant cavity.

[0022] Furthermore, the intake pipe includes:

[0023] The upper tube body and the lower tube body are connected at the rear end of the upper tube body and at the front end of the lower tube body. The air inlet and the first tapered nozzle are formed in the upper tube body, and the Helmholtz resonant cavity and the second tapered nozzle are formed in the lower tube body.

[0024] Furthermore, an air intake duct is provided at the rear end of the first tapered nozzle, and the air intake duct is a gas channel with a constant cross-section.

[0025] Furthermore, the resonant tube is located at the rear end of the intake duct, with the open end of the resonant tube facing the exhaust port at the rear end of the intake duct. A gap is reserved between the intake duct and the resonant tube, thereby forming a return gas outlet between the intake duct and the resonant tube.

[0026] Furthermore, the resonant tube is suspended at the rear end of the intake duct by a second fixing bracket;

[0027] The second fixing frame includes:

[0028] The first connector is a ring or C-shaped structure, and the air intake duct is secured inside the first connector.

[0029] A connecting arm, the two ends of which are respectively connected to the first connecting member and the second connecting member;

[0030] The second connector is a ring or C-shaped structure, and the resonant tube is secured inside the second connector.

[0031] Furthermore, by increasing the intake pressure;

[0032] And / or, set up multiple parallel air intake pipes;

[0033] And / or, increase the gas throughput of the vortex tube by mixing bypass gas into the inlet nozzle.

[0034] The vortex tube based on Helmholtz resonance excitation provided by this invention is an energy separation device that combines a Helmholtz resonant cavity with a vortex tube. It introduces the high-frequency oscillating airflow generated by the Helmholtz resonant cavity into the vortex tube, thereby effectively improving the energy separation performance and efficiency of the vortex tube, and thus promoting the popularization and practical application of vortex tubes. Attached Figure Description

[0035] Figure 1This is a three-dimensional structural schematic diagram of the vortex tube based on Helmholtz resonance excitation as described in Embodiment 1 of the present invention;

[0036] Figure 2 This is a side view schematic diagram of the vortex tube based on Helmholtz resonance excitation as described in Embodiment 1 of the present invention;

[0037] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0038] Figure 4 This is a front view schematic diagram of the vortex tube based on Helmholtz resonance excitation as described in Embodiment 1 of the present invention;

[0039] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0040] Figure 6 This is a three-dimensional structural schematic diagram of the vortex tube based on Helmholtz resonance excitation as described in Embodiment 2 of the present invention;

[0041] Figure 7 This is a side view of the vortex tube based on Helmholtz resonance excitation as described in Embodiment 2 of the present invention.

[0042] Figure 8 yes Figure 7 A schematic diagram of the cross-sectional structure along the CC direction;

[0043] Figure 9 This is a schematic diagram of the assembly structure of the air intake duct, the second fixing frame and the resonant tube in the vortex tube according to Embodiment 2 of the present invention;

[0044] Figure 10 The changes in the flow field frequency, flow field decibels, and temperature difference between the hot and cold ends of the vortex tube under different inlet pressures obtained in Experiment Example 1 of this invention are:

[0045] The markings in the diagram are as follows:

[0046] 1. Vortex tube body; 101. Inlet nozzle; 102. Cold end outlet; 103. Hot end outlet; 104. Vortex chamber; 2. Inlet pipe; 201. Inlet; 202. First tapering nozzle; 203. Helmholtz resonant cavity; 204. Resonant tube; 205. Second tapering nozzle; 206. Reversing gas outlet; 207. First fixing frame; 2a. Upper pipe body; 2b. Lower pipe body; 208. Inlet duct; 209. Second fixing frame; 2091. First connector; 2092. Connecting arm; 2093. Second connector; 210. Connecting flange. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0048] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0049] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0050] It should be noted that in the description of this application, the directional terms such as "front," "rear," "up," "down," "left," "right," "horizontal," "vertical," "horizontal," and "top," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 limiting the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself. In addition, the directional terms "front end" and "rear end" in this invention are based on the gas flow path. In the same component, the end through which the gas first flows is the "front end," and the end through which it last flows is the "rear end."

[0051] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0052] Example 1

[0053] like Figures 1-5 As shown, a vortex tube based on Helmholtz resonance excitation includes:

[0054] The intake pipe 2 has a Helmholtz resonance structure formed inside it.

[0055] The vortex tube body 1 is provided with an inlet nozzle 1, and the outlet of the air inlet pipe 2 is connected to the inlet nozzle 1;

[0056] High-pressure gas first enters the intake pipe 2, and under the action of the Helmholtz resonance structure in the intake pipe 2, a high-frequency oscillating airflow is formed. Then, the high-frequency oscillating airflow is introduced into the vortex tube body 1 through the inlet nozzle 1 for energy separation to obtain two airflows, cold and hot.

[0057] Preferably, the high-pressure gas entering the intake pipe 2 is a high-pressure gas with a pressure ≥ 50 kPa.

[0058] More preferably, the high-pressure gas entering the intake pipe 2 is a high-pressure gas with a pressure ≥480kPa.

[0059] Furthermore, a resonant tube 204 is installed inside the intake pipe 2. The resonant tube 204 is a pipe that is closed at one end and open at the other end. At this time, a Helmholtz resonant cavity 203 is formed between the inner wall of the resonant tube 204 and the outer wall of the intake pipe 2. The high-pressure gas first enters the resonant tube 12 and is compressed. The compressed gas comes into contact with the wall of the resonant tube 204 and then returns and expands outward, thereby causing the high-pressure gas to deflect laterally and the flow field to vibrate, generating a high-frequency oscillating airflow. The high-frequency oscillating airflow returns from the resonant tube 12 and enters the Helmholtz resonant cavity 203.

[0060] Preferably, the resonant tube 204 is coaxially arranged with the air intake pipe 2, so that an annular Helmholtz resonant cavity 203 can be formed between the outer wall of the resonant tube 204 and the inner wall of the air intake pipe 2.

[0061] Preferably, the flow field frequency inside the Helmholtz resonant cavity 203 is ≥5.7KHz.

[0062] Furthermore, the resonant tube 204 is installed and fixed inside the Helmholtz resonant cavity 203 by the first fixing bracket 207.

[0063] Preferably, the first fixing frame 207 is located at the rear end of the resonant tube 204. The form of the first fixing frame 207 is not limited, as long as it can fix the resonant tube 204 and allow high-pressure gas to pass through. For example, the first fixing frame 207 can be a fixing frame with a cross shape, a rice-shaped structure, etc.

[0064] Furthermore, along the airflow direction, the following are sequentially arranged within the air intake pipe 2:

[0065] The air inlet 201 is a gas passage with a constant cross-section;

[0066] The first tapering nozzle 202 is a gas channel whose cross-section gradually decreases along the flow direction of the airflow.

[0067] The air inlet 201 is connected to the first tapered nozzle 202, and the cross-sectional area of ​​the air inlet 201 is equal to the maximum cross-sectional area of ​​the front end of the first tapered nozzle 202. The resonant tube 204 is located at the rear end of the first tapered nozzle 202. A return gas outlet 206 is provided between the open end of the resonant tube 204 and the rear end of the first tapered nozzle 202. The return gas outlet 206 is used to discharge gas.

[0068] In use, the external high-pressure gas first enters the air intake pipe 2 through the air inlet 201, and then enters the first tapered nozzle 202. Due to the influence of the gradually decreasing cross-section of the first tapered nozzle 202, the high-pressure gas will be further accelerated and pressurized after flowing through the first tapered nozzle 202, forming a high-speed jet. This is beneficial for the gas to generate a higher frequency flow field vibration after passing through the resonant tube 204.

[0069] Preferably, the inner diameter of the resonant tube 204 is substantially equal to the inner diameter of the rear end of the first tapered nozzle 202, such that the inner diameter of the resonant tube 204 is 0.8 to 1.2 times the inner diameter of the rear end of the first tapered nozzle 202.

[0070] Preferably, the inner diameter of the Helmholtz resonant cavity 203 is larger than the inner diameter of the front end of the first tapered nozzle 202, such that the inner diameter of the Helmholtz resonant cavity 203 is 1.1 to 1.5 times the inner diameter of the front end of the first tapered nozzle 202.

[0071] Furthermore, the intake pipe 2 is equipped with:

[0072] The second tapering nozzle 205 is a gas channel whose cross-section gradually decreases along the flow direction of the airflow.

[0073] The second tapered nozzle 205 is located at the rear end of the Helmholtz resonant cavity 203, and the inner diameter of the Helmholtz resonant cavity 203 is equal to the inner diameter of the front end of the second tapered nozzle 205.

[0074] By setting the second tapered nozzle 205, the gas discharged from the Helmholtz resonant cavity 203 can be accelerated and pressurized a second time, so that the gas entering the inlet nozzle 101 has a high flow rate and pressure, providing a good foundation for the energy separation of the vortex tube body 1.

[0075] Preferably, the air inlet 201, the first tapered nozzle 202, the Helmholtz resonant cavity 203, the second tapered nozzle 205, and the air inlet pipe 2 are manufactured by an integral molding process.

[0076] The following provides a detailed description of the gas flow path and process in the vortex tube based on Helmholtz resonance excitation described in Example 1:

[0077] High-pressure gas first enters the inlet 201, then enters the first converging nozzle 202. After being accelerated and pressurized by the first converging nozzle 202, it forms a high-speed jet. The high-speed jet first enters the resonant tube 204 and is compressed. After the compressed gas contacts the wall of the resonant tube 204, it returns and expands outward, thereby causing lateral deflection of the high-speed jet and flow field vibration, forming a high-frequency oscillating airflow. The high-frequency oscillating airflow enters the Helmholtz resonant cavity 203 from the return gas outlet 206 and continues to flow downstream. After being accelerated and pressurized a second time by the second converging nozzle 205, it enters the vortex chamber 104 in the vortex tube body 1 from the inlet nozzle 101. The gas continues to expand and rotate at high speed in the vortex tube body 1, thereby separating into two fluids, cold and hot, and flowing out of the vortex tube body 1 from the cold end outlet 102 and the hot end outlet 103.

[0078] Example 2

[0079] like Figures 6-9 As shown, a vortex tube based on Helmholtz resonance excitation differs from Embodiment 1 in that the internal structure of the intake pipe 2 is different, specifically:

[0080] The air intake pipe 2 includes:

[0081] The upper tube 2a and the lower tube 2b are connected, with the rear end of the upper tube 2a connected to the front end of the lower tube 2b. The air inlet 201 and the first tapered nozzle 202 are formed in the upper tube 2a, and the Helmholtz resonant cavity 203 and the second tapered nozzle 205 are formed in the lower tube 2b.

[0082] Furthermore, the upper tube 2a and the lower tube 2b are detachably connected.

[0083] As some examples of the present invention, the upper tube body 2a and the lower tube body 2b can be connected by means of threaded connection, insertion, riveting, interference fit, etc.

[0084] Preferably, connecting flanges 210 are respectively provided at the connection between the upper pipe body 2a and the lower pipe body 2b, and the upper pipe body 2a and the lower pipe body 2b are detachably connected through the connecting flanges 210.

[0085] More preferably, a sealing ring is provided between the connecting flanges 210 on the upper pipe body 2a and the lower pipe body 2b.

[0086] Furthermore, an air intake duct 208 is provided at the rear end of the first tapered nozzle 202. The air intake duct 208 is a gas channel with a constant cross-section, and the inner diameter of the air intake duct 208 is equal to the inner diameter of the rear end of the first tapered nozzle 202.

[0087] Preferably, the air intake duct 208 is coaxially arranged with the upper pipe body 2a.

[0088] Furthermore, the resonant tube 204 is located at the rear end of the intake duct 208, and the open end of the resonant tube 204 is positioned directly opposite the exhaust port at the rear end of the intake duct 208. There is a certain gap between the intake duct 208 and the resonant tube 204, thereby forming a return gas outlet 206 between the intake duct 208 and the resonant tube 204.

[0089] Furthermore, the resonant tube 204 is suspended at the rear end of the intake duct 208 by a second fixing bracket 209.

[0090] As some examples of the present invention, such as Figures 8-9 As shown, the second fixing bracket 209 includes:

[0091] The first connector 2091 has a ring or C-shaped structure, and the air intake duct 208 is fixed in the first connector 2091;

[0092] Connecting arm 2092, with its two ends connected to the first connecting member 2091 and the second connecting member 2093 respectively;

[0093] The second connector 2093 has a ring or C-shaped structure, and the resonant tube 204 is secured within the second connector 2093.

[0094] Preferably, the second fixing frame 209 includes two connecting arms 2092 arranged opposite to each other, and a return gas outlet 206 is formed between the connecting arms 2092.

[0095] As some examples of the present invention, when the gas volume requirement is large, the gas handling capacity of the vortex tube can be increased by increasing the intake pressure of the intake port 201, and / or by setting up multiple parallel intake pipes 2, and / or by mixing bypass gas into the inlet nozzle 1.

[0096] Experimental Example 1

[0097] The energy separation performance of the vortex tube based on Helmholtz resonance excitation shown in Example 1 was tested and analyzed by passing gases of the same temperature but different pressures through it. The results are as follows: Figure 10 The results shown are as follows:

[0098] Test results prove:

[0099] (1) Under the excitation of Helmholtz resonance, the vortex tube has better energy separation performance, the temperature difference between its hot and cold ends is greater, and the temperature of the airflow discharged from the cold end is lower.

[0100] (2) More importantly, when the gas inlet pressure is above 480 kPa, the flow field frequency in the Helmholtz resonant cavity reaches above 5.7 kHz, and the decibel of the flow field in the Helmholtz resonant cavity increases significantly and dramatically. At this time, the temperature of the gas flow discharged from the cold end of the vortex tube also drops sharply, and the temperature difference between the hot and cold ends of the vortex tube increases by as much as 33.2 °C, resulting in a significant improvement in energy separation performance.

[0101] This demonstrates that the flow field vibration generated by Helmholtz resonance can significantly improve the energy separation performance of vortex tubes.

[0102] This invention is based on a complete understanding of vortex tubes. It is believed that the core factor in the energy separation process of vortex tubes is the precessing vortex core located at the reversible flow boundary. The structure of the precessing vortex core provides the amount of work done in energy transfer between the inner and outer fluid layers, and the magnitude of the work done depends on the magnitude and amplitude of the characteristic frequency of the micro-group oscillation.

[0103] Building upon this foundation, to significantly improve the energy separation performance of vortex tubes from a qualitative perspective, the applicant proposed a performance enhancement technology for vortex tubes based on Helmholtz resonance excitation. Corresponding experimental results show that introducing high-frequency oscillating airflow generated by a Helmholtz resonant cavity into the vortex tube can, at a certain frequency, excite the precessing vortex core to reach a resonance state, thereby significantly improving the energy separation performance of the vortex tube. The successful implementation of this optimization method not only provides effective guidance and indirect verification of the energy separation mechanism of vortex tubes but also opens up new directions for performance optimization methods and injects new vitality into promoting the large-scale industrial application of vortex tubes.

[0104] In summary, the vortex tube based on Helmholtz resonance excitation provided by this invention is an energy separation device that combines a Helmholtz resonant cavity with a vortex tube. It introduces the high-frequency oscillating airflow generated by the Helmholtz resonant cavity into the vortex tube, thereby effectively improving the energy separation performance and efficiency of the vortex tube, and thus promoting the popularization and practical application of vortex tubes.

[0105] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A vortex tube based on Helmholtz resonance excitation, characterized in that, include: An intake pipe (2) is provided, and a Helmholtz resonance structure is formed within the intake pipe (2). The vortex tube body (1) is provided with an inlet nozzle (101), and the outlet of the air inlet pipe (2) is connected to the inlet nozzle (101); High-pressure gas first enters the intake pipe (2), and under the action of the Helmholtz resonance structure in the intake pipe (2), a high-frequency oscillating airflow is formed. Then, the high-frequency oscillating airflow is introduced into the vortex tube body (1) through the inlet nozzle (101) for energy separation to obtain two airflows, cold and hot. A resonant tube (204) is provided inside the air intake pipe (2). The resonant tube (204) is a pipe with one end closed and the other end open. A Helmholtz resonant cavity (203) is formed between the outer wall of the resonant tube (204) and the inner wall of the air intake pipe (2). High-pressure gas first enters the resonant tube (204) and is compressed. The compressed gas comes into contact with the wall of the resonant tube (204) and then returns and expands outward, thereby causing the high-pressure gas to deflect laterally and the flow field to vibrate, generating a high-frequency oscillating airflow. The high-frequency oscillating airflow returns from the resonant tube (204) and enters the Helmholtz resonant cavity (203). The flow field frequency in the Helmholtz resonant cavity (203) is ≥5.7KHz. Along the direction of airflow, the following are sequentially arranged inside the air intake pipe (2): The air inlet (201) is a gas passage with a constant cross-section; The first tapering nozzle (202) is a gas channel whose cross-section gradually decreases along the flow direction of the airflow; The air inlet (201) is connected to the first tapered nozzle (202), and the resonant tube (204) is located at the rear end of the first tapered nozzle (202). A return gas outlet (206) is formed between the open end of the resonant tube (204) and the rear end of the first tapered nozzle (202). When in use, the external high-pressure gas first enters the air intake pipe (2) through the air inlet (201), and then enters the first tapered nozzle (202). After being accelerated and pressurized by the first tapered nozzle (202), it forms a high-speed jet and enters the resonant tube (204).

2. The vortex tube based on Helmholtz resonance excitation according to claim 1, characterized in that, The resonant tube (204) is installed and fixed inside the Helmholtz resonant cavity (203) by the first fixing bracket (207).

3. The vortex tube based on Helmholtz resonance excitation according to claim 1, characterized in that, The air intake pipe (2) is equipped with: The second tapering nozzle (205) is a gas channel whose cross-section gradually decreases along the flow direction of the airflow; the second tapering nozzle (205) is located at the rear end of the Helmholtz resonant cavity (203).

4. The vortex tube based on Helmholtz resonance excitation according to claim 3, characterized in that, The air intake pipe (2) includes: The upper tube (2a) and the lower tube (2b) are connected, with the rear end of the upper tube (2a) connected to the front end of the lower tube (2b). The air inlet (201) and the first tapered nozzle (202) are formed in the upper tube (2a), and the Helmholtz resonant cavity (203) and the second tapered nozzle (205) are formed in the lower tube (2b).

5. The vortex tube based on Helmholtz resonance excitation according to claim 4, characterized in that, An air intake duct (208) is provided at the rear end of the first tapered nozzle (202), and the air intake duct (208) is a gas channel with a constant cross-section.

6. The vortex tube based on Helmholtz resonance excitation according to claim 5, characterized in that, The resonant tube (204) is located at the rear end of the air intake duct (208). The open end of the resonant tube (204) is positioned opposite the exhaust port at the rear end of the air intake duct (208). A gap is reserved between the air intake duct (208) and the resonant tube (204) to form a return gas outlet (206) between the air intake duct (208) and the resonant tube (204).

7. The vortex tube based on Helmholtz resonance excitation according to claim 6, characterized in that, The resonant tube (204) is suspended at the rear end of the air intake duct (208) by a second fixing bracket (209); The second fixing frame (209) includes: The first connector (2091) has an annular or C-shaped structure, and the air intake duct (208) is secured in the first connector (2091); The connecting arm (2092) is connected at both ends to the first connecting member (2091) and the second connecting member (2093), respectively. The second connector (2093) is a ring or C-shaped structure, and the resonant tube (204) is secured in the second connector (2093).

8. The vortex tube based on Helmholtz resonance excitation according to claim 1, characterized in that, By increasing the intake pressure; And / or, set up multiple parallel air intake pipes (2); And / or, increase the gas throughput of the vortex tube by mixing bypass gas into the inlet nozzle (101).

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