CN109737627B - Anti-clogging high-efficiency vortex tube without hot end valve - Google Patents
Anti-clogging high-efficiency vortex tube without hot end valve Download PDFInfo
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- CN109737627B CN109737627B CN201811612219.1A CN201811612219A CN109737627B CN 109737627 B CN109737627 B CN 109737627B CN 201811612219 A CN201811612219 A CN 201811612219A CN 109737627 B CN109737627 B CN 109737627B
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Abstract
The invention particularly relates to an anti-blocking efficient vortex tube without a hot end valve. The technical scheme of the invention is to provide a vortex tube which consists of a gas inlet tube, a vortex tube outer box, a rubber gasket, a vortex generator, a hot end hole tube, a cold end outlet tube and a series of hot end external members. According to the vortex tube hot end-free valve, after a series of hot end kit gases are subjected to energy transfer at the hot end, peripheral high-temperature gases are directly discharged into the atmosphere, so that the energy loss is reduced, and the temperature of the hot end is further increased; the possibility of blockage of the hot end outlet is greatly reduced, so that the vortex tube can be used under a worse condition, the reliability of the vortex tube is improved, and the maintenance cost of the vortex tube is further reduced; the structure of a knob (hot end valve) at the hot end of the vortex tube is removed, the manufacturing cost of the vortex tube is greatly reduced, and the application market of the vortex tube is expanded.
Description
Technical Field
The invention belongs to the field of vortex tubes, and particularly relates to an anti-blocking efficient vortex tube without a hot end valve, which is mainly used for local heating and cooling in a complex working condition situation that gas contains more impurities.
Background
The vortex tube is a novel energy separation device developed in the fortieth years of the last century, and mainly works by utilizing the vortex effect generated when compressible gas rotates at high speed. The vortex effect refers to the radial temperature gradient distribution generated by the high-speed rotating pressurized airflow and directed from the edge to the axis. The traditional vortex tube mainly comprises an air inlet channel, a vortex cavity, a hot end valve, a cold end outlet and a hot end outlet tube. When the vortex tube works, high-pressure gas enters the vortex cavity from the air inlet channel along the tangential direction, and rotates at a high speed in the vortex cavity to generate a vortex effect, so that the high-pressure gas is separated into two gas flows with different total temperatures, the cold gas in the central part flows through the cold end outlet and is discharged, and the hot gas in the outer edge part flows through the hot end regulating valve and is discharged from the hot end outlet. The vortex tube can generate refrigeration and heating effects simultaneously, and different cold and hot gas flow ratios can be obtained by adjusting the opening degree of the hot end adjusting valve, so that the optimal refrigeration effect or heating effect is obtained.
To illustrate the relevant quantitative parameters of vortex tube efficiency, the following description is made in conjunction with two types of vortex generators commonly used at present:
1) maximum cold end temperature difference vortex generator. Cold end temperature difference delta TcIs referred to as the inlet temperature T0And cold end temperature TcA difference of (i.e.
ΔTc＝T0-Tc
Cold air ratio mucRefers to cold end mass flow qmcWith inlet mass flow qm0Ratio of (i) to (ii)
The maximum cold end temperature difference vortex generator enables the vortex tube to obtain the maximum cold end temperature difference under the conditions of the same inlet total pressure, inlet mass flow and cold air ratio.
2) Maximum cold flow vortex generator. Energy efficiency ratio COP refers to the ratio of energy used for cooling to the energy consumed by adiabatic expansion of the inlet gas stream, i.e.
Wherein QcIs the cooling rate of the gas per unit mass flow, w is the mechanical energy used for cooling the gas per unit mass flow, if the working medium is regarded as an ideal gas, there are
Qc＝μcCp(T0-Tc)
Wherein gamma is the adiabatic coefficient, R is the gas constant, P0And PcThe inlet total pressure and the outlet total pressure are respectively. Thereby having
The maximum cold flow vortex generator means that the maximum energy efficiency ratio can be obtained under the condition of the same inlet total pressure, inlet mass flow and cold air ratio.
Since the discovery of the vortex tube effect, both theoretical analysis and practical application studies have attracted considerable interest to scientists around the world. The energy separation effect and the working medium separation effect of the vortex tube are widely applied in the industry. The advantages of vortex tubes without moving parts, ease of maintenance, no need for additional energy input, safety, simplicity, low installation costs make them highly advantageous in heating and cooling, gas-liquid separation, separation of gas mixtures, gas drying, electronics cooling, etc.
However, since the vortex tube is often operated under complicated and severe conditions, the high-pressure gas inevitably contains impurities such as solid dust and water vapor. The high-pressure gas is directly introduced into an inlet of the vortex tube, forms a high-speed rotating motion state through the vortex generator, is separated into an inner layer airflow and an outer layer airflow with opposite radial speeds in the vortex tube, and is discharged through a cold end outlet due to energy transfer caused by strong centrifugal force action and airflow viscosity, wherein the total temperature of the inner layer gas is lower and the content of impurities is less; the total temperature of the outer layer airflow is higher, the impurities are more, the outer layer airflow makes spiral motion towards the hot end valve and is discharged through the hot end valve. The exhaust passage of the traditional vortex tube hot end valve is complex in zigzag and easy to block under the severe air condition, so that the overall efficiency of the vortex tube is affected. On the other hand, the complex structure of the hot end valve improves the processing difficulty of the vortex tube, increases the integral price of the vortex tube, ensures that the application cost of the vortex tube is high, is difficult to clean, and greatly improves the maintenance cost of the vortex tube. Meanwhile, after investigation, the vortex tube valve does not need to be adjusted repeatedly under most application conditions, but can be fixed at a position after being adjusted once and is not changed any more, so that the utilization rate of the adjusting function of the hot end valve is very low.
Disclosure of Invention
The technical problem to be solved is as follows: in order to avoid the defects of the prior art, the invention provides the anti-blocking high-efficiency vortex tube without the hot end valve.
The technical scheme of the invention is as follows: a high-efficiency vortex tube without a hot end valve and with an anti-blocking function comprises a vortex tube body, wherein one end of a vortex tube outer box of the vortex tube body is a cold airflow end, and the other end of the vortex tube outer box of the vortex tube body is a hot airflow end; the cold air flow end is sequentially provided with a vortex generator, a rubber gasket and a cold end outlet pipe; the method is characterized in that: a hot end external member is coaxially arranged at the hot airflow end, and comprises a series of hot end outlet taper pipes with different outlet diameters; the hot end outlet taper pipe is of a tubular structure with external threads at two ends, a conical channel is arranged inside the hot end outlet taper pipe, one end of the conical channel is a wide-mouth end, the other end of the conical channel is a narrow-mouth end, and the diameter of an inner hole at the wide-mouth end is larger than that of an inner hole at the narrow-mouth end; the diameter of the inner hole at the wide-mouth end is equal to that of the inner hole at the hot airflow end outlet of the vortex tube outer box, and the inner hole and the diameter of the inner hole are coaxially arranged; the range of the bore diameter at the thin-mouth end is given by:
2≤Ds≤x+3
wherein D issThe diameter of an inner hole at the thin end is mm; x is the vortex cavity depth of the vortex generator.
The further technical scheme of the invention is as follows: the length L of the hot end outlet conical tube is 5 to 10 times of the outer diameter D of the hot gas flow end outlet of the vortex tube outer box.
The further technical scheme of the invention is as follows: the hot end external member comprises 5 hot end outlet taper pipes, and the gradient value of the diameter of the inner hole of the thin opening end of each hot end outlet taper pipe is
The further technical scheme of the invention is as follows: and the peripheral wall surfaces of the vortex tube outer box, the cold end outlet pipe and the hot end external member are covered with heat insulation materials so as to reduce the heat exchange between the vortex tube and the external environment.
The further technical scheme of the invention is as follows: the outer ends of the hot end external member and the cold end outlet pipe are both connected with a section of silencing pipeline for reducing noise generated by the vortex tube.
The further technical scheme of the invention is as follows: the outer end of the hot end outlet conical tube is connected with a gas inlet of a second vortex tube, and higher hot end outlet temperature is obtained through the series connection of the vortex tubes; similarly, the outer end of the cold end outlet pipe is connected with the gas inlet of the third vortex pipe, so that lower cold end outlet temperature can be obtained.
The further technical scheme of the invention is as follows: the hot end outlet taper pipe is connected with the junction of the hot gas flow end outlet of the vortex tube outer box through a flange plate, and a rubber gasket is arranged between the flange plates and used for preventing gas leakage.
The further technical scheme of the invention is as follows: the periphery of the hot end outlet taper pipe is of a double-layer wall surface structure, a gap between the double-layer wall surfaces is vacuumized, heat exchange between the vortex pipe and the external environment is reduced, and the temperature of the hot end outlet is increased.
Advantageous effects
The invention has the beneficial effects that: according to the vortex tube without the hot end valve, after the gas is subjected to energy transfer at the hot end, the peripheral high-temperature gas is directly discharged into the atmosphere, so that the energy loss is reduced, and the temperature of the hot end is further increased; the possibility of blockage of the hot end outlet is greatly reduced, so that the vortex tube can be used under a worse condition, the reliability of the vortex tube is improved, and the maintenance cost of the vortex tube is further reduced; the knob structure at the hot end of the vortex tube is removed, the manufacturing cost of the vortex tube is greatly reduced, and the application market of the vortex tube is expanded.
The peripheral wall surfaces of the vortex tube outer box, the cold end outlet pipe and the hot end external member are covered with heat insulation materials, so that the heat exchange between the vortex tube and the external environment is reduced, and the refrigerating performance and the heating performance of the vortex tube can be effectively improved.
The hot end external member and the cold end outlet pipe can be connected with a section of silencing pipeline, so that the noise generated by the vortex tube is reduced.
The hot end external member can be connected with the inlet of another vortex tube, the higher hot end outlet temperature can be obtained through the series connection of the vortex tubes, and similarly, the cold end outlet tube is connected with the inlet of another vortex tube, so that the lower cold end outlet temperature can be obtained.
The range of the bore diameter at the thin-mouth end is given by: 2 is less than or equal to DsX +3 is less than or equal to the range, and the exceeding or falling below the range wastes energy and reduces the cost performance of the vortex tube.
Drawings
FIG. 1 is a perspective view of a vortex tube;
FIG. 2 is a pictorial view of a vortex tube;
FIG. 3 is a block diagram of the vortex tube hot end kit of FIG. 1;
FIG. 4 is a schematic view of a vortex tube in accordance with an embodiment of the present invention;
FIG. 5 is the energy separation characteristic of a vortex generator with an inlet pressure of 4bar and a maximum cold airflow of a vortex chamber of 1 mm;
FIG. 6 is the energy efficiency ratio characteristic of a vortex generator with an inlet pressure of 4bar and a maximum cold airflow of a vortex chamber of 1 mm;
description of reference numerals: 1. the vortex tube cooling device comprises a gas inlet, 1.1. a fastening inclined plane, 2. a vortex tube outer box, 3. a hot end hole tube, 3.1. a hot flow channel, 4. a vortex generator, 4.1. a tangential flow channel, 4.2. a vortex cavity, 4.3. a cold air conical tube, 5. a rubber gasket, 6. a cold end outlet tube, 6.1 a cold flow channel, 7. a hot end sleeve and 7.1 a conical channel.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Fig. 1 shows a schematic perspective view of a vortex tube in this embodiment. In the embodiment, the vortex tube comprises a gas inlet (1) provided with a fastening inclined plane (1.1), a vortex tube outer box (2), a hot end hole tube (3) provided with a hot flow channel (3.1), a vortex generator (4) provided with a tangential flow channel (4.1), a vortex cavity (4.2) and a cold air conical tube (4.3), a rubber gasket (5), a cold end outlet tube (6) provided with a cold flow channel (6.1), and a hot end sleeve piece (7) provided with a conical channel (7.1). Hot junction pore pipe (3), vortex generator (4), rubber packing ring (5) are installed in the outer casket (2) of vortex tube in proper order and are formed clearance fit, the outer casket (2) of vortex tube is connected with gas inlet (1), cold junction outlet pipe (6), hot junction external member (7) respectively, gas inlet pipe (1), tangential runner (4.1), vortex chamber (4.2) form inlet channel, air conditioning cone (4.3), cold flow channel (6.1) form the air conditioning passageway, hot flow channel (3.1), conical channel (7.1) form hot gas channel.
Fig. 2 is a perspective view of the vortex tube in this embodiment. The airflow inlet pipe (1) is made of copper-zinc alloy and has a diameter of 8-10mm, preferably 10 mm. The airflow inlet (1) is connected with the vortex tube outer box (2) through threads, and the connection part is wound with a raw material belt to increase the air tightness. The vortex tube outer box (2), the cold end outlet (3) and the hot end external member (7) are all made of 304 stainless steel. A rubber gasket (5) is additionally arranged between the hot end external member (7) and the vortex tube outer box (2) for threaded connection and sealing.
FIG. 3 is a block diagram of a vortex tube hot end kit. The outer surface of the hot end external member is a cylinder with mounting threads on the left and right, the inner part of the hot end external member is a conical channel, the diameter of the wide-mouth end of the hot end external member is equal to the diameter of the hot end outlet of the vortex tube outer box, and the hot end external member is connected with the vortex tube outer box during mounting. The diameter range of the inner hole at the thin opening end of the hot end sleeve is given by the following formula
2≤DsX +3 (unit: mm)
Wherein DsThe diameter of the inner hole of the thin-end is the same as the depth of the vortex cavity of the vortex generator, and the range exceeding or falling below the range can cause energy waste and reduce the cost performance of the vortex tube.
The diameter gradient of the inner hole of the thin port end is set according to the diameter range, the practicability and the cost factor are comprehensively considered, the hot end external member comprises 5 hot end outlet taper pipes, and the gradient value of the diameter of the inner hole of the thin port end of each hot end outlet taper pipe is
The hot end outlet cone length L may be 5 to 10 times the vortex tube outer box hot end outlet diameter D, preferably L-9D.
One embodiment of a vortex tube of the present invention is shown in FIG. 4. In this example, the present vortex tube was mounted on a laboratory bench. Volume of 1000m3The air box is stored with clean air with the pressure of 0.8MPa, and the air box is used as a stable air source of the experiment table. After the air flow passes through the total pressure valve (A), the air flow is limited to a set pressure valueAnd then passes through a vortex shedding flowmeter (B). A200 mm straight pipe is arranged in front of the vortex shedding flowmeter B, and a 100mm straight pipe is arranged behind the flowmeter to ensure the measurement accuracy of the vortex shedding flowmeter. PT100 thermal resistor (C) is installed 100mm behind vortex flowmeter (B), and thermal resistor sensor locates pipeline center department, makes total temperature measurement more accurate reliable. The barometer (D) is installed behind the thermal resistor (C) and measures the static pressure of the airflow before the airflow enters the vortex tube. The airflow enters the vortex tube to form a high-speed rotating flow state and is separated into two airflows with different temperatures, one airflow with lower total temperature is discharged from the cold end of the vortex tube, the other airflow with higher total temperature is discharged from the hot end of the vortex tube, and because the airflow still rotates at high speed when being discharged from the vortex tube, the accuracy of the vortex shedding flowmeter is disturbed, so that honeycomb pipelines with the length of 80mm are additionally arranged between the outlet of the cold end of the vortex tube and between the outlet of the hot end of the vortex tube and the vortex shedding flowmeter (H) for rectifying the airflow. The cold air flow passes through a vortex street flowmeter (E) and a PT100 thermal resistor (F) in sequence and is finally discharged into the atmosphere; the hot air flows successively through the vortex street flowmeter (H) and the PT100 thermal resistor (G) and is discharged into the atmosphere. The control on the energy separation effect can be realized by adjusting the size of the total pressure valve (A) and replacing different hot end external members. Meanwhile, in order to reduce the influence of pipeline heat dissipation on experimental results, the surface of the vortex tube and the later part of the vortex tube are completely covered with heat insulation sponge and nylon cloth, double heat insulation treatment is carried out, and the refrigerating performance and the heating performance of the vortex tube can be effectively improved. The outer ends of the hot end external member and the cold end outlet pipe can be connected with a section of silencing pipeline, so that the noise generated by the vortex tube is reduced.
Fig. 5 and 6 show the comparison of the performance of the vortex tube of the present invention with that of a conventional vortex tube at an inlet pressure of 4 bar. Data for a conventional vortex tube was obtained by mounting the conventional vortex tube on the same bench, by varying the degree of opening of the hot end valve. With the increase of the opening of the valve at the hot end of the traditional vortex tube, the temperature at the hot end is gradually increased, reaches the maximum value when the cold air ratio is between about 0.6 and 0.7, and then is gradually reduced and approaches to the inlet temperature; the cold end temperature first decreases gradually, reaches a minimum at a cold gas ratio of between about 0.2 and 0.3, and then increases gradually and toward the inlet temperature. For the vortex tube of the present invention, the data were measured at the inner hole diameters of the thin port end of the hot end kit of 1mm, 2mm, 3mm, and 4mm, respectively.
FIG. 5 is a graph showing the energy separation characteristics of a vortex tube of the present invention compared to a conventional vortex tube when a vortex generator with a maximum cooling capacity at an inlet pressure of 4bar and a vortex cavity width of 1mm is used. In the experiment, the cold end temperature difference of the traditional vortex tube reaches the maximum value of 22.58K when the cold air ratio is 0.32, while the cold end temperature difference of the vortex tube of the invention reaches 21.76K when a hot end sleeve with the diameter of 4mm is used, and the temperature difference is only 3.6 percent smaller than that of the traditional vortex tube. The vortex tube of the invention has great advantages in heating, the temperature difference of the hot end of the traditional vortex tube reaches the maximum value of 23.82K when the cold air ratio is 0.53, and the temperature difference of the hot end can reach 27.26K when a hot end kit with the diameter of 2mm is used, and the heating efficiency is improved by 14 percent.
Fig. 6 shows a graph comparing the energy efficiency ratio characteristics of the vortex tube of the present invention with a conventional vortex tube using a vortex generator with a maximum cooling capacity at an inlet pressure of 4 bar. The traditional vortex tube has the largest energy efficiency ratio of 0.065 when the cold air ratio is 0.53, while the vortex tube of the invention has the energy efficiency ratio of 0.073 when a 3mm hot end sleeve is used, which is 112 percent of that of the traditional vortex tube.
It can be found that under the same working condition, when the cold gas ratio is high (60%), the temperature difference of the valveless vortex tube is larger than that of the traditional vortex tube, and the energy separation performance is better, and when the cold gas ratio is low or medium (60%), the temperature difference of the valveless vortex tube is slightly smaller than that of the traditional vortex tube, and the energy separation performance is slightly weaker but is not much different. Compared with the traditional vortex tube, the vortex tube has higher refrigeration energy efficiency ratio and higher energy utilization efficiency during refrigeration.
The outer end of the hot end external member can be connected with another vortex tube gas inlet, higher hot end outlet temperature can be obtained through the series connection of vortex tubes, and similarly, the lower cold end outlet temperature can be obtained by connecting another vortex tube gas inlet behind the cold end outlet tube.
In addition, the connection between the hot end outlet conical tube and the hot gas end outlet of the vortex tube outer box is provided with an internal and external thread structure, the hot end outlet conical tube and the hot gas end outlet of the vortex tube outer box are connected through the flange plates, and the rubber gaskets are arranged between the flange plates and used for preventing gas leakage, so that the hot end sleeve piece can be more easily disassembled and assembled, and the usability is improved.
The periphery of the hot end outlet taper pipe can be processed into a double-layer wall surface structure, the gap is vacuumized, heat exchange between the vortex pipe and the external environment can be greatly reduced, and the temperature of the hot end outlet is improved.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (7)
1. A high-efficiency vortex tube without a hot end valve and with an anti-blocking function comprises a vortex tube body, wherein one end of a vortex tube outer box of the vortex tube body is a cold airflow end, and the other end of the vortex tube outer box of the vortex tube body is a hot airflow end; the cold air flow end is sequentially provided with a vortex generator, a rubber gasket and a cold end outlet pipe; the method is characterized in that: a hot end external member is coaxially arranged at the hot airflow end, and comprises a series of hot end outlet taper pipes with different outlet diameters; the hot end outlet taper pipe is of a tubular structure with external threads at two ends, a conical channel is arranged inside the hot end outlet taper pipe, one end of the conical channel is a wide-mouth end, the other end of the conical channel is a narrow-mouth end, and the diameter of an inner hole at the wide-mouth end is larger than that of an inner hole at the narrow-mouth end; the diameter of the inner hole at the wide-mouth end is equal to that of the inner hole at the hot airflow end outlet of the vortex tube outer box, and the inner hole and the diameter of the inner hole are coaxially arranged; the range of the bore diameter at the thin-mouth end is given by:
2≤Ds≤x+3
wherein D issThe diameter of an inner hole at the thin end is mm; x is the vortex cavity depth of the vortex generator;
the length L of the hot end outlet conical tube is 5 to 10 times of the outer diameter D of the hot gas flow end outlet of the vortex tube outer box.
2. The choke-free high efficiency vortex tube of claim 1, wherein:the hot end external member comprises 5 hot end outlet taper pipes, and the gradient value of the diameter of the inner hole of the thin opening end of each hot end outlet taper pipe is
3. The choke-free high efficiency vortex tube of claim 1, wherein: and the peripheral wall surfaces of the vortex tube outer box, the cold end outlet pipe and the hot end external member are covered with heat insulation materials so as to reduce the heat exchange between the vortex tube and the external environment.
4. The choke-free high efficiency vortex tube of claim 1, wherein: the outer ends of the hot end external member and the cold end outlet pipe are both connected with a section of silencing pipeline for reducing noise generated by the vortex tube.
5. The choke-free high efficiency vortex tube of claim 1, wherein: the outer end of the hot end outlet conical tube is connected with a gas inlet of a second vortex tube, and higher hot end outlet temperature is obtained through the series connection of the vortex tubes; similarly, the outer end of the cold end outlet pipe is connected with the gas inlet of the third vortex pipe, so that lower cold end outlet temperature can be obtained.
6. The choke-free high efficiency vortex tube of claim 1, wherein: the hot end outlet taper pipe is connected with the junction of the hot gas flow end outlet of the vortex tube outer box through a flange plate, and a rubber gasket is arranged between the flange plates and used for preventing gas leakage.
7. The choke-free high efficiency vortex tube of claim 1, wherein: the hot end outlet taper pipe is of a double-layer wall surface structure, a gap between the double-layer wall surfaces is vacuumized, heat exchange between the vortex pipe and the external environment is reduced, and the temperature of the hot end outlet is increased.
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| CN201811612219.1A CN109737627B (en) | 2018-12-27 | 2018-12-27 | Anti-clogging high-efficiency vortex tube without hot end valve |
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| CN201811612219.1A CN109737627B (en) | 2018-12-27 | 2018-12-27 | Anti-clogging high-efficiency vortex tube without hot end valve |
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| EA002780B1 (en) * | 1998-10-16 | 2002-08-29 | Трансланг Текнолоджиз Лтд. | Method and apparatus for separation gas mixture components and liquefaction therefor |
| JP3411247B2 (en) * | 1999-10-28 | 2003-05-26 | スター商事株式会社 | Cooling and heating device |
| CN2502211Y (en) * | 2001-10-29 | 2002-07-24 | 裕祥精机工业股份有限公司 | Heat exchanger |
| RU2248508C1 (en) * | 2003-08-01 | 2005-03-20 | Белостоцкий Юрий Григорьевич | Method of operating vortex pipe and vortex pipe |
| CN201203295Y (en) * | 2008-04-25 | 2009-03-04 | 深圳市力科气动科技有限公司 | Vortex tube |
| CN202041019U (en) * | 2011-04-01 | 2011-11-16 | 铁岭市光明仪器仪表厂 | Refrigeration air tube |
| RU2576513C2 (en) * | 2011-07-08 | 2016-03-10 | Общество с ограниченной ответственностью "ВКМ групп" | Method of ionising air and apparatus therefor |
| JP5878436B2 (en) * | 2012-07-29 | 2016-03-08 | 博 久保田 | Equipment that can obtain hot air, cold air, electricity, concentrated oxygen and concentrated nitrogen simultaneously |
| CN102937344B (en) * | 2012-11-13 | 2014-12-03 | 浙江大学 | Vortex tube with axial cold and heat switching mechanism and heat exchange system with same |
| CN108106038A (en) * | 2016-11-24 | 2018-06-01 | 王峰 | A kind of adverse current type vortex tube miniature refrigerator |
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