Vortex tube based on Helmholtz resonance excitation

Abstract

The invention belongs to the technical field of energy separation, and particularly relates to a vortex tube based on Helmholtz resonance excitation, which comprises an air inlet pipeline in which a Helmholtz resonance structure is formed; 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 gas inlet pipeline, high-frequency oscillation gas flow is formed under the action of the Helmholtz resonance structure in the gas inlet pipeline, and then the high-frequency oscillation gas flow is introduced into the vortex tube body through the inlet nozzle for energy separation to obtain cold gas flow and hot gas flow. According to the vortex tube based on Helmholtz resonance excitation, high-frequency oscillation airflow generated by the Helmholtz resonance cavity is introduced into the vortex tube, and therefore the energy separation performance and efficiency of the vortex tube are effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of energy separation, and specifically relates to a vortex tube, and in particular to a vortex tube based on Helmholtz resonance excitation. Background Art

[0002] A vortex tube is a device that can separate compressed gas into cold and hot air flows. It has a simple and sophisticated structure, mainly including an inlet nozzle, a vortex chamber, a separation structure (such as an orifice plate or a cyclone), cold and hot outlets, and an optional control valve. The vortex tube has the advantages of simple structure, no moving parts, low cost, easy adjustment, and no pollution, but it also has disadvantages such as relatively low refrigeration efficiency, high noise, and dependence on a high-pressure gas source. Generally speaking, there are few factors that affect the stable operation of the vortex tube. As long as a high-pressure gas source can be obtained, stable hot and cold air flows can be produced instantly.

[0003] At present, the low energy separation efficiency of vortex tubes has become a key "bottleneck problem" that restricts their further development in the field of energy utilization. In order to improve the energy separation efficiency of vortex tubes, technicians in this field have conducted many explorations, but looking back on previous studies on vortex tube performance optimization technologies, it is found that due to the lack of essential understanding of the flow structure and energy separation mechanism of vortex tubes, most of the optimization methods for vortex tubes are "fine-tuning" of the structure under conditions that do not fully meet the optimization criteria. Although these methods have achieved a slight improvement in performance, they lack universal applicability.

[0004] Research by Xiangji Guo, Liu Bo, and others pointed out that the flow field in the 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 vortex tube [J]. International Journal of Thermal Science, 2021, 168: 107067.). In addition, since the vortex tube is always accompanied by a whistling sound during operation, some scholars believe that this sound signal is related to energy separation, and have proved that when the whistling in the flow field is suppressed at a certain frequency, the energy separation performance of the vortex tube is also limited by installing a muffler at the inlet of the vortex tube (see Kurosaka M. Acoustic streaming in swirling flow and the Ranque-Hilsch (vortex tube) effect [J]. Journal of Fluid Mechanics, 1982, 124: 1173-1198.). In addition, patents with publication (announcement) numbers RU2114358C1 and CN116734497A also disclose improved methods of vortex tubes based on the induction of fluid oscillation by sound, pressure, etc. It is speculated that the energy separation performance of the vortex tube may be related to the oscillation characteristics of the flow field in the vortex tube.

[0005] In addition, the Helmholtz resonance cavity is a device that can generate high-frequency oscillations in the flow field. A high-speed jet flows into and out of a pipe closed at 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 resonance 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, the present invention proposes a vortex tube based on Helmholtz resonance excitation, so as to combine the Helmholtz resonance cavity with the vortex tube, and provide an improved vortex tube with higher refrigeration efficiency and suitable for wide popularization and use. Summary of the invention

[0007] The purpose of the present invention is to provide a vortex tube based on Helmholtz resonance excitation with higher refrigeration efficiency and suitable for wide popularization and use in response to the above-mentioned technical problems.

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

[0009] an air intake duct, wherein a Helmholtz resonance structure is formed in the air intake duct;

[0010] A vortex tube body, on which an inlet nozzle is arranged, and the air outlet of the air inlet pipe is connected to the inlet nozzle;

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

[0012] Furthermore, a resonance tube is arranged in the intake duct, wherein the resonance tube is a tube with one end closed and the other end open, and a Helmholtz resonance cavity is formed between the inner wall of the resonance tube and the outer wall of the intake duct;

[0013] The high-pressure gas first enters the resonance tube and is compressed. The generated compressed gas contacts the wall of the resonance 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 resonance tube, it enters the Helmholtz resonance cavity. The flow field frequency in the Helmholtz resonance cavity is ≥5.7KHz.

[0014] Furthermore, the resonance tube is installed and fixed in the Helmholtz resonance cavity through a first fixing frame.

[0015] Furthermore, along the flow direction of the airflow, the air intake duct is provided in sequence:

[0016] an air inlet, which is a gas passage of constant cross-section;

[0017] A first tapered nozzle, which is a gas passage whose cross section gradually decreases along the flow direction of the gas flow;

[0018] The air inlet is connected to the first converging nozzle, the resonance tube is located at the rear end of the first converging nozzle, and a return gas outlet is formed between the open end of the resonance tube and the rear end of the first converging nozzle;

[0019] When in use, external high-pressure gas first enters the intake duct through the intake port, then enters the first tapered nozzle, is accelerated and pressurized by the first tapered nozzle to form a high-speed jet, and then enters the resonance tube.

[0020] Furthermore, the air intake duct is provided with:

[0021] The second tapered nozzle is a gas passage whose cross section gradually decreases along the flow direction of the gas flow; the second tapered nozzle is located at the rear end of the Helmholtz resonance cavity.

[0022] Furthermore, the air intake duct comprises:

[0023] An upper tube body and a lower tube body, wherein the rear end of the upper tube body is connected to 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 resonance 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 passage with a constant cross section.

[0025] Furthermore, the resonance tube is located at the rear end of the intake duct, and the open end of the resonance tube is arranged opposite to the exhaust port at the rear end of the intake duct, and a gap is reserved between the intake duct and the resonance tube, thereby forming a return gas outlet between the intake duct and the resonance tube.

[0026] Furthermore, the resonance tube is suspended at the rear end of the intake duct through a second fixing frame;

[0027] The second fixing frame comprises:

[0028] A first connecting piece, which is an annular or C-shaped structure, and the air intake duct is fixed in the first connecting piece;

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

[0030] The second connecting member is an annular or C-shaped structure, and the resonance tube is fixed in the second connecting member.

[0031] Further, by increasing the intake pressure;

[0032] and / or, providing multiple parallel air intake ducts;

[0033] And / or, the gas processing capacity of the vortex tube is increased by mixing bypass gas into the inlet nozzle.

[0034] The vortex tube based on Helmholtz resonance excitation provided by the present invention is an energy separation device that combines a Helmholtz resonance cavity with a vortex tube, which introduces the high-frequency oscillating airflow generated by the Helmholtz resonance cavity into the vortex tube, thereby effectively improving the energy separation performance and efficiency of the vortex tube, thereby promoting the promotion and practical application of the vortex tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1is a schematic diagram of the three-dimensional structure of the vortex tube based on Helmholtz resonance excitation according to Example 1 of the present invention;

[0036] Figure 2 is a schematic side view of the structure of the vortex tube based on Helmholtz resonance excitation according to Example 1 of the present invention;

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

[0038] Figure 4 is a front view structural schematic diagram of the vortex tube based on Helmholtz resonance excitation according to Example 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 is a schematic diagram of the three-dimensional structure of the vortex tube based on Helmholtz resonance excitation according to Example 2 of the present invention;

[0041] Figure 7 is a schematic side view of the structure of the vortex tube based on Helmholtz resonance excitation according to Example 2 of the present invention;

[0042] Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure in the CC direction;

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

[0044] Fig.10 The changes in the flow field frequency, flow field decibels, and temperature difference between the cold and hot ends of the vortex tube in the Helmholtz resonance cavity under different inlet pressures obtained in Experimental Example 1 of the present invention;

[0045] The symbols in the figure are:

[0046] 1. vortex tube body; 101. inlet nozzle; 102. cold end outlet; 103. hot end outlet; 104. vortex chamber; 2. air intake duct; 201. air intake; 202. first tapered nozzle; 203. Helmholtz resonance cavity; 204. resonance tube; 205. second tapered nozzle; 206. return gas outlet; 207. first fixing frame; 2a. upper tube body; 2b. lower tube body; 208. air intake duct; 209. second fixing frame; 2091. first connecting piece; 2092. connecting arm; 2093. second connecting piece; 210. connecting flange. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0048] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0049] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0050] It should be noted that in the description of the present application, the orientation or positional relationship indicated by the terms such as "front, back, up, down, left, right", "lateral, vertical, vertical, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words 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 cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself. In addition, the orientation terms "front end" and "rear end" in the present invention are based on the gas flow path. In the same component, the end where the gas first flows through is the "front end" and the end where the gas last flows through is the "rear end".

[0051] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0052] Example 1

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

[0054] An air intake duct 2, wherein a Helmholtz resonance structure is formed in the air intake duct 2;

[0055] A vortex tube body 1, on which an inlet nozzle 1 is arranged, and the air outlet of the air inlet pipe 2 is connected to the inlet nozzle 1;

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

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

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

[0059] Furthermore, a resonance tube 204 is arranged in the intake duct 2. The resonance tube 204 is a tube with one end closed and the other end open. At this time, a Helmholtz resonance cavity 203 is formed between the inner wall of the resonance tube 204 and the outer wall of the intake duct 2. The high-pressure gas first enters the resonance tube 12 and is compressed. The generated compressed gas contacts the wall surface of the resonance tube 204 and then returns and expands outward, thereby causing lateral deflection of the high-pressure gas and flow field vibration, generating a high-frequency oscillating airflow. The high-frequency oscillating airflow returns from the resonance tube 12 and enters the Helmholtz resonance cavity 203.

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

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

[0062] Furthermore, the resonance tube 204 is installed and fixed in the Helmholtz resonance cavity 203 via a first fixing frame 207 .

[0063] Preferably, the first fixing frame 207 is located at the rear end of the resonance tube 204. The form of the first fixing frame 207 is not limited, as long as it can fix the resonance 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, "M" shape, etc. structure.

[0064] Furthermore, along the flow direction of the airflow, the air intake duct 2 is provided in sequence:

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

[0066] A first tapered nozzle 202, which is a gas passage whose cross section gradually decreases along the flow direction of the gas flow;

[0067] The air inlet 201 is connected to the first converging 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 converging nozzle 202. The resonance tube 204 is located at the rear end of the first converging nozzle 202. A return gas outlet 206 is provided between the open end of the resonance tube 204 and the rear end of the first converging nozzle 202. The return gas outlet 206 is used for gas discharge.

[0068] When in use, external high-pressure gas first enters the intake pipe 2 through the air inlet 201, and then enters the first tapered nozzle 202. Affected by 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 to form a high-speed jet, which is conducive to the gas generating higher-frequency flow field vibrations after passing through the resonance tube 204.

[0069] Preferably, the inner diameter of the resonance tube 204 is substantially equal to the inner diameter of the rear end of the first tapered nozzle 202 , for example, the inner diameter of the resonance 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 resonance cavity 203 is larger than the inner diameter of the front end of the first tapered nozzle 202 , such as the inner diameter of the Helmholtz resonance 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 air intake pipe 2 is provided with:

[0072] The second tapered nozzle 205 is a gas passage whose cross section gradually decreases along the flow direction of the gas flow;

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

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

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

[0076] The flow path and process of the gas in the vortex tube based on Helmholtz resonance excitation described in Example 1 are described in detail below:

[0077] The high-pressure gas first enters the air inlet 201, and then enters the first tapered nozzle 202. After being accelerated and pressurized by the first tapered nozzle 202, a high-speed jet is formed. The high-speed jet first enters the resonance tube 204 and is compressed. The compressed gas contacts the wall of the resonance tube 204 and then 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 resonance cavity 203 from the return gas outlet 206 and continues to flow downstream. After being accelerated and pressurized for the second time by the second tapered 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 streams of cold and hot fluids 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 to 9 As shown, a vortex tube based on Helmholtz resonance excitation is different from the above-mentioned embodiment 1 mainly in that the internal structure of the intake duct 2 is different, specifically:

[0080] The air intake duct 2 comprises:

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

[0082] Furthermore, the upper tube body 2a and the lower tube body 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 threaded connection, plug-in connection, riveting, interference fit, etc.

[0084] Preferably, connecting flanges 210 are respectively provided at the connection positions of the upper tube body 2a and the lower tube body 2b, and the upper tube body 2a and the lower tube body 2b are detachably connected via the connecting flanges 210.

[0085] More preferably, a sealing ring is provided between the connecting flanges 210 on the upper tube body 2a and the lower tube 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 passage with a constant cross section. 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 tube body 2a.

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

[0089] Furthermore, the resonance pipe 204 is suspended at the rear end of the intake duct 208 via a second fixing frame 209 .

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

[0091] A first connecting member 2091, which is an annular or C-shaped structure, and the air intake duct 208 is fixed in the first connecting member 2091;

[0092] A connecting arm 2092, two ends of which are respectively connected to the first connecting member 2091 and the second connecting member 2093;

[0093] The second connecting member 2093 is an annular or C-shaped structure, and the resonance tube 204 is fixed in the second connecting member 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 demand for gas volume is large, the gas processing capacity of the vortex tube can be increased by increasing the intake pressure of the air inlet 201, and / or setting up multiple parallel intake pipes 2, and / or mixing bypass gas into the inlet nozzle 1.

[0096] Test Example 1

[0097] The gases with the same temperature and different pressures were respectively introduced into the vortex tube based on Helmholtz resonance excitation as shown in Example 1 to test and analyze its energy separation performance, and the results are as follows: Fig.10 The results shown are:

[0098] Test results prove:

[0099] (1) Under Helmholtz resonance excitation, the vortex tube has better energy separation performance, the temperature difference between the cold and hot ends is larger, 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 frequency of the flow field in the Helmholtz resonance cavity reaches above 5.7 kHz, and the decibel of the flow field in the Helmholtz resonance cavity increases significantly. At this time, the temperature of the airflow discharged from the cold end of the vortex tube also drops suddenly, and the temperature difference between the airflow discharged from the cold and hot ends of the vortex tube increases by as much as 33.2 °C, which significantly improves the energy separation performance.

[0101] It can be seen that the flow field vibration generated by Helmholtz resonance can significantly improve the energy separation performance of the vortex tube.

[0102] The present invention is based on a complete cognitive system of vortex tubes, and believes that the core factor of the vortex tube energy separation process is the precessing vortex core located on the boundary surface of the reentrant flow. The structure of the precessing vortex core provides the work done for energy transfer between the inner and outer fluids, and the amount of work done depends on the size and amplitude of the characteristic frequency of the micro-group oscillation.

[0103] On this basis, in order to significantly improve the energy separation performance of the vortex tube in terms of "quality", the applicant proposed a vortex tube performance leap technology based on Helmholtz resonance excitation. The corresponding experimental results show that the high-frequency oscillating airflow generated by the Helmholtz resonance cavity is introduced into the vortex tube. At a certain frequency, the precessing vortex core can be excited and reach a resonant state, and the energy separation performance of the vortex tube is leapt. The successful implementation of this optimization method is not only an effective guidance and indirect verification of the energy separation mechanism of the vortex tube, but also opens up a new direction 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 the present invention is an energy separation device that combines a Helmholtz resonance cavity with a vortex tube, which introduces the high-frequency oscillating airflow generated by the Helmholtz resonance cavity into the vortex tube, thereby effectively improving the energy separation performance and efficiency of the vortex tube, thereby promoting the promotion and practical application of the vortex tube.

[0105] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A vortex tube based on Helmholtz resonance excitation, characterized in that: include: An air intake duct (2), wherein a Helmholtz resonance structure is formed in the air intake duct (2); A vortex tube body (1) is provided with an inlet nozzle (1), and the air outlet of the air inlet pipe (2) is connected to the inlet nozzle (1); The high-pressure gas first enters the air intake duct (2), and forms a high-frequency oscillating airflow under the action of the Helmholtz resonance structure in the air intake duct (2). The high-frequency oscillating airflow is then introduced into the vortex tube body (1) through the inlet nozzle (1) for energy separation to obtain cold and hot airflows.

2. The vortex tube based on Helmholtz resonance excitation according to claim 1, characterized in that: A resonance tube (204) is arranged in the air intake pipe (2), wherein the resonance tube (204) is a pipe with one end closed and the other end open, and a Helmholtz resonance cavity (203) is formed between the inner wall of the resonance tube (204) and the outer wall of the air intake pipe (2); The high-pressure gas first enters the resonance tube (12) and is compressed. The generated compressed gas contacts the wall surface of the resonance tube (204) and then returns and expands outward, thereby causing lateral deflection of the high-pressure gas and flow field vibration, generating a high-frequency oscillating airflow. The high-frequency oscillating airflow returns from the resonance tube (12) and enters the Helmholtz resonance cavity (203). The flow field frequency in the Helmholtz resonance cavity (203) is ≥5.7 kHz.

3. The vortex tube based on Helmholtz resonance excitation according to claim 2, characterized in that: The resonance tube (204) is installed and fixed in the Helmholtz resonance cavity (203) via a first fixing frame (207).

4. The vortex tube based on Helmholtz resonance excitation according to claim 2, characterized in that: Along the flow direction of the airflow, the air intake duct (2) is provided with: An air inlet (201), which is a gas passage with a constant cross section; A first tapered nozzle (202), which is a gas passage whose cross section gradually decreases along the flow direction of the gas flow; The air inlet (201) is connected to the first converging nozzle (202), the resonance tube (204) is located at the rear end of the first converging nozzle (202), and a return gas outlet (206) is formed between the open end of the resonance tube (204) and the rear end of the first converging nozzle (202); When in use, the external high-pressure gas first enters the air intake pipe (2) through the air intake port (201), then enters the first tapered nozzle (202), is accelerated and pressurized by the first tapered nozzle (202), forms a high-speed jet, and enters the resonance tube (204).

5. The vortex tube based on Helmholtz resonance excitation according to claim 4, characterized in that: The air intake pipe (2) is provided with: The second tapered nozzle (205) is a gas passage whose cross section gradually decreases along the flow direction of the gas flow; the second tapered nozzle (205) is located at the rear end of the Helmholtz resonance cavity (203).

6. The vortex tube based on Helmholtz resonance excitation according to claim 5, characterized in that: The air intake duct (2) comprises: An upper tube body (2a) and a lower tube body (2b), wherein the rear end of the upper tube body (2a) is connected to the front end of the lower tube body (2b), the air inlet (201) and the first tapered nozzle (202) are formed in the upper tube body (2a), and the Helmholtz resonance cavity (203) and the second tapered nozzle (205) are formed in the lower tube body (2b).

7. The vortex tube based on Helmholtz resonance excitation according to claim 6, characterized in that: An air intake duct (208) is arranged at the rear end of the first tapered nozzle (202), and the air intake duct (208) is a gas passage with a constant cross section.

8. The vortex tube based on Helmholtz resonance excitation according to claim 7, characterized in that: The resonance tube (204) is located at the rear end of the intake duct (208), and the open end of the resonance tube (204) is arranged opposite to the exhaust port at the rear end of the intake duct (208). A gap is reserved between the intake duct (208) and the resonance tube (204), thereby forming a return gas outlet (206) between the intake duct (208) and the resonance tube (204).

9. The vortex tube based on Helmholtz resonance excitation according to claim 8, characterized in that: The resonance tube (204) is suspended at the rear end of the intake duct (208) via a second fixing frame (209); The second fixing frame (209) comprises: A first connecting piece (2091) having an annular or C-shaped structure, wherein the air intake duct (208) is fixed in the first connecting piece (2091); A connecting arm (2092), two ends of which are respectively connected to the first connecting member (2091) and the second connecting member (2093); The second connecting member (2093) is an annular or C-shaped structure, and the resonance tube (204) is fixed in the second connecting member (2093).

10. The vortex tube based on Helmholtz resonance excitation according to claim 1, characterized in that: By increasing the intake pressure; and / or, providing multiple parallel air intake pipes (2); And / or, the gas processing capacity of the vortex tube is increased by mixing bypass gas into the inlet nozzle (1).

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